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: src/sys/netgraph/ng_ether.c,v 1.62 2007/03/20 00:36:10 bms Exp $
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/bridge/if_bridgevar.h>
65
66 #include <netgraph7/ng_message.h>
67 #include <netgraph7/netgraph.h>
68 #include <netgraph7/ng_parse.h>
69 #include "ng_ether.h"
70
71 #define IFP2AC(ifp) ((struct arpcom *)ifp)
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 /* Functional hooks called from if_ethersubr.c */
88 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
89 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
90 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
91 static void ng_ether_attach(struct ifnet *ifp);
92 static void ng_ether_detach(struct ifnet *ifp);
93 #if 0
94 static void ng_ether_link_state(struct ifnet *ifp, int state);
95 #endif
96
97 /* Other functions */
98 static int ng_ether_rcv_lower(node_p node, struct mbuf *m);
99 static int ng_ether_rcv_upper(node_p node, struct mbuf *m);
100
101 /* Netgraph node methods */
102 static ng_constructor_t ng_ether_constructor;
103 static ng_rcvmsg_t ng_ether_rcvmsg;
104 static ng_shutdown_t ng_ether_shutdown;
105 static ng_newhook_t ng_ether_newhook;
106 static ng_rcvdata_t ng_ether_rcvdata;
107 static ng_disconnect_t ng_ether_disconnect;
108 static int ng_ether_mod_event(module_t mod, int event, void *data);
109
110 /* List of commands and how to convert arguments to/from ASCII */
111 static const struct ng_cmdlist ng_ether_cmdlist[] = {
112 {
113 NGM_ETHER_COOKIE,
114 NGM_ETHER_GET_IFNAME,
115 "getifname",
116 NULL,
117 &ng_parse_string_type
118 },
119 {
120 NGM_ETHER_COOKIE,
121 NGM_ETHER_GET_IFINDEX,
122 "getifindex",
123 NULL,
124 &ng_parse_int32_type
125 },
126 {
127 NGM_ETHER_COOKIE,
128 NGM_ETHER_GET_ENADDR,
129 "getenaddr",
130 NULL,
131 &ng_parse_enaddr_type
132 },
133 {
134 NGM_ETHER_COOKIE,
135 NGM_ETHER_SET_ENADDR,
136 "setenaddr",
137 &ng_parse_enaddr_type,
138 NULL
139 },
140 {
141 NGM_ETHER_COOKIE,
142 NGM_ETHER_GET_PROMISC,
143 "getpromisc",
144 NULL,
145 &ng_parse_int32_type
146 },
147 {
148 NGM_ETHER_COOKIE,
149 NGM_ETHER_SET_PROMISC,
150 "setpromisc",
151 &ng_parse_int32_type,
152 NULL
153 },
154 {
155 NGM_ETHER_COOKIE,
156 NGM_ETHER_GET_AUTOSRC,
157 "getautosrc",
158 NULL,
159 &ng_parse_int32_type
160 },
161 {
162 NGM_ETHER_COOKIE,
163 NGM_ETHER_SET_AUTOSRC,
164 "setautosrc",
165 &ng_parse_int32_type,
166 NULL
167 },
168 {
169 NGM_ETHER_COOKIE,
170 NGM_ETHER_ADD_MULTI,
171 "addmulti",
172 &ng_parse_enaddr_type,
173 NULL
174 },
175 {
176 NGM_ETHER_COOKIE,
177 NGM_ETHER_DEL_MULTI,
178 "delmulti",
179 &ng_parse_enaddr_type,
180 NULL
181 },
182 {
183 NGM_ETHER_COOKIE,
184 NGM_ETHER_DETACH,
185 "detach",
186 NULL,
187 NULL
188 },
189 { 0 }
190 };
191
192 static struct ng_type ng_ether_typestruct = {
193 .version = NG_ABI_VERSION,
194 .name = NG_ETHER_NODE_TYPE,
195 .mod_event = ng_ether_mod_event,
196 .constructor = ng_ether_constructor,
197 .rcvmsg = ng_ether_rcvmsg,
198 .shutdown = ng_ether_shutdown,
199 .newhook = ng_ether_newhook,
200 .rcvdata = ng_ether_rcvdata,
201 .disconnect = ng_ether_disconnect,
202 .cmdlist = ng_ether_cmdlist,
203 };
204 NETGRAPH_INIT(ether, &ng_ether_typestruct);
205
206 /******************************************************************
207 ETHERNET FUNCTION HOOKS
208 ******************************************************************/
209
210 /*
211 * Handle a packet that has come in on an interface. We get to
212 * look at it here before any upper layer protocols do.
213 *
214 * NOTE: this function will get called at splimp()
215 */
216 static void
ng_ether_input(struct ifnet * ifp,struct mbuf ** mp)217 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
218 {
219 const node_p node = IFP2NG(ifp);
220 const priv_p priv = NG_NODE_PRIVATE(node);
221 int error;
222
223 /* If "lower" hook not connected, let packet continue */
224 if (priv->lower == NULL)
225 return;
226 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
227 }
228
229 /*
230 * Handle a packet that has come in on an interface, and which
231 * does not match any of our known protocols (an ``orphan'').
232 *
233 * NOTE: this function will get called at splimp()
234 */
235 static void
ng_ether_input_orphan(struct ifnet * ifp,struct mbuf * m)236 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
237 {
238 const node_p node = IFP2NG(ifp);
239 const priv_p priv = NG_NODE_PRIVATE(node);
240 int error;
241
242 /* If "orphan" hook not connected, discard packet */
243 if (priv->orphan == NULL) {
244 m_freem(m);
245 return;
246 }
247 NG_SEND_DATA_ONLY(error, priv->orphan, m);
248 }
249
250 /*
251 * Handle a packet that is going out on an interface.
252 * The Ethernet header is already attached to the mbuf.
253 */
254 static int
ng_ether_output(struct ifnet * ifp,struct mbuf ** mp)255 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
256 {
257 const node_p node = IFP2NG(ifp);
258 const priv_p priv = NG_NODE_PRIVATE(node);
259 int error = 0;
260
261 /* If "upper" hook not connected, let packet continue */
262 if (priv->upper == NULL)
263 return (0);
264
265 /* Send it out "upper" hook */
266 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
267 return (error);
268 }
269
270 /*
271 * A new Ethernet interface has been attached.
272 * Create a new node for it, etc.
273 */
274 static void
ng_ether_attach(struct ifnet * ifp)275 ng_ether_attach(struct ifnet *ifp)
276 {
277 priv_p priv;
278 node_p node;
279
280 /* Create node */
281 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
282 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
283 log(LOG_ERR, "%s: can't %s for %s\n",
284 __func__, "create node", ifp->if_xname);
285 return;
286 }
287
288 /* Allocate private data */
289 priv = kmalloc(sizeof(*priv), M_NETGRAPH,
290 M_WAITOK | M_NULLOK | 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->hwassist = ifp->if_hwassist;
301
302 /* Try to give the node the same name as the interface */
303 if (ng_name_node(node, ifp->if_xname) != 0) {
304 log(LOG_WARNING, "%s: can't name node %s\n",
305 __func__, ifp->if_xname);
306 }
307 }
308
309 /*
310 * An Ethernet interface is being detached.
311 * REALLY Destroy its node.
312 */
313 static void
ng_ether_detach(struct ifnet * ifp)314 ng_ether_detach(struct ifnet *ifp)
315 {
316 const node_p node = IFP2NG(ifp);
317 const priv_p priv = NG_NODE_PRIVATE(node);
318
319 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
320 /*
321 * We can't assume the ifnet is still around when we run shutdown
322 * So zap it now. XXX We HOPE that anything running at this time
323 * handles it (as it should in the non netgraph case).
324 */
325 IFP2NG(ifp) = NULL;
326 priv->ifp = NULL; /* XXX race if interrupted an output packet */
327 ng_rmnode_self(node); /* remove all netgraph parts */
328 }
329
330 #if 0
331 /*
332 * Notify graph about link event.
333 * if_link_state_change() has already checked that the state has changed.
334 */
335 static void
336 ng_ether_link_state(struct ifnet *ifp, int state)
337 {
338 const node_p node = IFP2NG(ifp);
339 const priv_p priv = NG_NODE_PRIVATE(node);
340 struct ng_mesg *msg;
341 int cmd, dummy_error = 0;
342
343 if (priv->lower == NULL)
344 return;
345
346 if (state == LINK_STATE_UP)
347 cmd = NGM_LINK_IS_UP;
348 else if (state == LINK_STATE_DOWN)
349 cmd = NGM_LINK_IS_DOWN;
350 else
351 return;
352
353 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_WAITOK | M_NULLOK);
354 if (msg != NULL)
355 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
356 }
357 #endif
358 /******************************************************************
359 NETGRAPH NODE METHODS
360 ******************************************************************/
361
362 /*
363 * It is not possible or allowable to create a node of this type.
364 * Nodes get created when the interface is attached (or, when
365 * this node type's KLD is loaded).
366 */
367 static int
ng_ether_constructor(node_p node)368 ng_ether_constructor(node_p node)
369 {
370 return (EINVAL);
371 }
372
373 /*
374 * Check for attaching a new hook.
375 */
376 static int
ng_ether_newhook(node_p node,hook_p hook,const char * name)377 ng_ether_newhook(node_p node, hook_p hook, const char *name)
378 {
379 const priv_p priv = NG_NODE_PRIVATE(node);
380 hook_p *hookptr;
381
382 /* Divert hook is an alias for lower */
383 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
384 name = NG_ETHER_HOOK_LOWER;
385
386 /* Which hook? */
387 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
388 hookptr = &priv->upper;
389 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0)
390 hookptr = &priv->lower;
391 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0)
392 hookptr = &priv->orphan;
393 else
394 return (EINVAL);
395
396 /* Check if already connected (shouldn't be, but doesn't hurt) */
397 if (*hookptr != NULL)
398 return (EISCONN);
399
400 /* Disable hardware checksums while 'upper' hook is connected */
401 if (hookptr == &priv->upper)
402 priv->ifp->if_hwassist = 0;
403
404 /* OK */
405 *hookptr = hook;
406 return (0);
407 }
408
409 /*
410 * Receive an incoming control message.
411 */
412 static int
ng_ether_rcvmsg(node_p node,item_p item,hook_p lasthook)413 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
414 {
415 const priv_p priv = NG_NODE_PRIVATE(node);
416 struct ng_mesg *resp = NULL;
417 int error = 0;
418 struct ng_mesg *msg;
419
420 NGI_GET_MSG(item, msg);
421 switch (msg->header.typecookie) {
422 case NGM_ETHER_COOKIE:
423 switch (msg->header.cmd) {
424 case NGM_ETHER_GET_IFNAME:
425 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
426 if (resp == NULL) {
427 error = ENOMEM;
428 break;
429 }
430 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
431 break;
432 case NGM_ETHER_GET_IFINDEX:
433 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK);
434 if (resp == NULL) {
435 error = ENOMEM;
436 break;
437 }
438 *((u_int32_t *)resp->data) = priv->ifp->if_index;
439 break;
440 case NGM_ETHER_GET_ENADDR:
441 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_WAITOK | M_NULLOK);
442 if (resp == NULL) {
443 error = ENOMEM;
444 break;
445 }
446 bcopy(IF_LLADDR(priv->ifp),
447 resp->data, ETHER_ADDR_LEN);
448 break;
449 case NGM_ETHER_SET_ENADDR:
450 {
451 if (msg->header.arglen != ETHER_ADDR_LEN) {
452 error = EINVAL;
453 break;
454 }
455 error = if_setlladdr(priv->ifp,
456 (u_char *)msg->data, ETHER_ADDR_LEN);
457 break;
458 }
459 case NGM_ETHER_GET_PROMISC:
460 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK);
461 if (resp == NULL) {
462 error = ENOMEM;
463 break;
464 }
465 *((u_int32_t *)resp->data) = priv->promisc;
466 break;
467 case NGM_ETHER_SET_PROMISC:
468 {
469 u_char want;
470
471 if (msg->header.arglen != sizeof(u_int32_t)) {
472 error = EINVAL;
473 break;
474 }
475 want = !!*((u_int32_t *)msg->data);
476 if (want ^ priv->promisc) {
477 if ((error = ifpromisc(priv->ifp, want)) != 0)
478 break;
479 priv->promisc = want;
480 }
481 break;
482 }
483 case NGM_ETHER_GET_AUTOSRC:
484 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK);
485 if (resp == NULL) {
486 error = ENOMEM;
487 break;
488 }
489 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
490 break;
491 case NGM_ETHER_SET_AUTOSRC:
492 if (msg->header.arglen != sizeof(u_int32_t)) {
493 error = EINVAL;
494 break;
495 }
496 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
497 break;
498 #if 0
499 case NGM_ETHER_ADD_MULTI:
500 {
501 struct sockaddr_dl sa_dl;
502 struct ifmultiaddr *ifma;
503
504 if (msg->header.arglen != ETHER_ADDR_LEN) {
505 error = EINVAL;
506 break;
507 }
508 bzero(&sa_dl, sizeof(struct sockaddr_dl));
509 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
510 sa_dl.sdl_family = AF_LINK;
511 sa_dl.sdl_alen = ETHER_ADDR_LEN;
512 bcopy((void *)msg->data, LLADDR(&sa_dl),
513 ETHER_ADDR_LEN);
514 /*
515 * Netgraph is only permitted to join groups once
516 * via the if_addmulti() KPI, because it cannot hold
517 * struct ifmultiaddr * between calls. It may also
518 * lose a race while we check if the membership
519 * already exists.
520 */
521 IF_ADDR_LOCK(priv->ifp);
522 ifma = if_findmulti(priv->ifp,
523 (struct sockaddr *)&sa_dl);
524 IF_ADDR_UNLOCK(priv->ifp);
525 if (ifma != NULL) {
526 error = EADDRINUSE;
527 } else {
528 error = if_addmulti(priv->ifp,
529 (struct sockaddr *)&sa_dl, &ifma);
530 }
531 break;
532 }
533 #endif
534 case NGM_ETHER_DEL_MULTI:
535 {
536 struct sockaddr_dl sa_dl;
537
538 if (msg->header.arglen != ETHER_ADDR_LEN) {
539 error = EINVAL;
540 break;
541 }
542 bzero(&sa_dl, sizeof(struct sockaddr_dl));
543 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
544 sa_dl.sdl_family = AF_LINK;
545 sa_dl.sdl_alen = ETHER_ADDR_LEN;
546 bcopy((void *)msg->data, LLADDR(&sa_dl),
547 ETHER_ADDR_LEN);
548 error = if_delmulti(priv->ifp,
549 (struct sockaddr *)&sa_dl);
550 break;
551 }
552 case NGM_ETHER_DETACH:
553 ng_ether_detach(priv->ifp);
554 break;
555 default:
556 error = EINVAL;
557 break;
558 }
559 break;
560 default:
561 error = EINVAL;
562 break;
563 }
564 NG_RESPOND_MSG(error, node, item, resp);
565 NG_FREE_MSG(msg);
566 return (error);
567 }
568
569 /*
570 * Receive data on a hook.
571 */
572 static int
ng_ether_rcvdata(hook_p hook,item_p item)573 ng_ether_rcvdata(hook_p hook, item_p item)
574 {
575 const node_p node = NG_HOOK_NODE(hook);
576 const priv_p priv = NG_NODE_PRIVATE(node);
577 struct mbuf *m;
578
579 NGI_GET_M(item, m);
580 NG_FREE_ITEM(item);
581
582 if (hook == priv->lower || hook == priv->orphan)
583 return ng_ether_rcv_lower(node, m);
584 if (hook == priv->upper)
585 return ng_ether_rcv_upper(node, m);
586 panic("%s: weird hook", __func__);
587 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */
588 return (0);
589 #endif
590 }
591
592 /*
593 * Handle an mbuf received on the "lower" or "orphan" hook.
594 */
595 static int
ng_ether_rcv_lower(node_p node,struct mbuf * m)596 ng_ether_rcv_lower(node_p node, struct mbuf *m)
597 {
598 const priv_p priv = NG_NODE_PRIVATE(node);
599 struct ifnet *const ifp = priv->ifp;
600
601 /* Check whether interface is ready for packets */
602 if (!((ifp->if_flags & IFF_UP) &&
603 (ifp->if_flags & IFF_RUNNING))) {
604 NG_FREE_M(m);
605 return (ENETDOWN);
606 }
607
608 /* Make sure header is fully pulled up */
609 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
610 NG_FREE_M(m);
611 return (EINVAL);
612 }
613 if (m->m_len < sizeof(struct ether_header)
614 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
615 return (ENOBUFS);
616
617 /* Drop in the MAC address if desired */
618 if (priv->autoSrcAddr) {
619
620 /* Make the mbuf writable if it's not already */
621 if (!M_WRITABLE(m)
622 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
623 return (ENOBUFS);
624
625 /* Overwrite source MAC address */
626 bcopy(IF_LLADDR(ifp),
627 mtod(m, struct ether_header *)->ether_shost,
628 ETHER_ADDR_LEN);
629 }
630
631 /* Send it on its way */
632 return ether_output_frame(ifp, m);
633 }
634
635 /*
636 * Handle an mbuf received on the "upper" hook.
637 */
638 extern struct mbuf *bridge_input_p(struct ifnet *, struct mbuf *);
639 static int
ng_ether_rcv_upper(node_p node,struct mbuf * m)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_p(ifp, m);
659 if (m == NULL)
660 return (0);
661 }
662
663 /* Route packet back in */
664 ether_demux_oncpu(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
ng_ether_shutdown(node_p node)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 kfree(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
ng_ether_disconnect(hook_p hook)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
ng_ether_mod_event(module_t mod,int event,void * data)731 ng_ether_mod_event(module_t mod, int event, void *data)
732 {
733 struct ifnet *ifp;
734 int error = 0;
735
736 crit_enter();
737 switch (event) {
738 case MOD_LOAD:
739
740 /* Register function hooks */
741 if (ng_ether_attach_p != NULL) {
742 error = EEXIST;
743 break;
744 }
745 ng_ether_attach_p = ng_ether_attach;
746 ng_ether_detach_p = ng_ether_detach;
747 ng_ether_output_p = ng_ether_output;
748 ng_ether_input_p = ng_ether_input;
749 ng_ether_input_orphan_p = ng_ether_input_orphan;
750 #if 0
751 ng_ether_link_state_p = ng_ether_link_state;
752 #endif
753
754 /* Create nodes for any already-existing Ethernet interfaces */
755 ifnet_lock();
756 TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
757 if (ifp->if_type == IFT_ETHER
758 || ifp->if_type == IFT_L2VLAN)
759 ng_ether_attach(ifp);
760 }
761 ifnet_unlock();
762 break;
763
764 case MOD_UNLOAD:
765
766 /*
767 * Note that the base code won't try to unload us until
768 * all nodes have been removed, and that can't happen
769 * until all Ethernet interfaces are removed. In any
770 * case, we know there are no nodes left if the action
771 * is MOD_UNLOAD, so there's no need to detach any nodes.
772 */
773
774 /* Unregister function hooks */
775 ng_ether_attach_p = NULL;
776 ng_ether_detach_p = NULL;
777 ng_ether_output_p = NULL;
778 ng_ether_input_p = NULL;
779 ng_ether_input_orphan_p = NULL;
780 #if 0
781 ng_ether_link_state_p = NULL;
782 #endif
783 break;
784
785 default:
786 error = EOPNOTSUPP;
787 break;
788 }
789 crit_exit();
790 return (error);
791 }
792
793