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/8.3/sys/netgraph/ng_ether.c 224215 2011-07-19 11:04:58Z zec $
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/proc.h>
56 #include <sys/syslog.h>
57 #include <sys/socket.h>
58 #include <sys/taskqueue.h>
59
60 #include <net/if.h>
61 #include <net/if_dl.h>
62 #include <net/if_types.h>
63 #include <net/if_arp.h>
64 #include <net/if_var.h>
65 #include <net/ethernet.h>
66 #include <net/if_bridgevar.h>
67 #include <net/vnet.h>
68
69 #include <netgraph/ng_message.h>
70 #include <netgraph/netgraph.h>
71 #include <netgraph/ng_parse.h>
72 #include <netgraph/ng_ether.h>
73
74 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph)
75
76 /* Per-node private data */
77 struct private {
78 struct ifnet *ifp; /* associated interface */
79 hook_p upper; /* upper hook connection */
80 hook_p lower; /* lower hook connection */
81 hook_p orphan; /* orphan hook connection */
82 u_char autoSrcAddr; /* always overwrite source address */
83 u_char promisc; /* promiscuous mode enabled */
84 u_long hwassist; /* hardware checksum capabilities */
85 u_int flags; /* flags e.g. really die */
86 };
87 typedef struct private *priv_p;
88
89 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
90 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
91 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
92 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
93 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
94 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
95 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
96
97 /* Functional hooks called from if_ethersubr.c */
98 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
99 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
100 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
101 static void ng_ether_attach(struct ifnet *ifp);
102 static void ng_ether_detach(struct ifnet *ifp);
103 static void ng_ether_link_state(struct ifnet *ifp, int state);
104
105 /* Other functions */
106 static int ng_ether_rcv_lower(hook_p node, item_p item);
107 static int ng_ether_rcv_upper(hook_p node, item_p item);
108
109 /* Netgraph node methods */
110 static ng_constructor_t ng_ether_constructor;
111 static ng_rcvmsg_t ng_ether_rcvmsg;
112 static ng_shutdown_t ng_ether_shutdown;
113 static ng_newhook_t ng_ether_newhook;
114 static ng_rcvdata_t ng_ether_rcvdata;
115 static ng_disconnect_t ng_ether_disconnect;
116 static int ng_ether_mod_event(module_t mod, int event, void *data);
117
118 /* List of commands and how to convert arguments to/from ASCII */
119 static const struct ng_cmdlist ng_ether_cmdlist[] = {
120 {
121 NGM_ETHER_COOKIE,
122 NGM_ETHER_GET_IFNAME,
123 "getifname",
124 NULL,
125 &ng_parse_string_type
126 },
127 {
128 NGM_ETHER_COOKIE,
129 NGM_ETHER_GET_IFINDEX,
130 "getifindex",
131 NULL,
132 &ng_parse_int32_type
133 },
134 {
135 NGM_ETHER_COOKIE,
136 NGM_ETHER_GET_ENADDR,
137 "getenaddr",
138 NULL,
139 &ng_parse_enaddr_type
140 },
141 {
142 NGM_ETHER_COOKIE,
143 NGM_ETHER_SET_ENADDR,
144 "setenaddr",
145 &ng_parse_enaddr_type,
146 NULL
147 },
148 {
149 NGM_ETHER_COOKIE,
150 NGM_ETHER_GET_PROMISC,
151 "getpromisc",
152 NULL,
153 &ng_parse_int32_type
154 },
155 {
156 NGM_ETHER_COOKIE,
157 NGM_ETHER_SET_PROMISC,
158 "setpromisc",
159 &ng_parse_int32_type,
160 NULL
161 },
162 {
163 NGM_ETHER_COOKIE,
164 NGM_ETHER_GET_AUTOSRC,
165 "getautosrc",
166 NULL,
167 &ng_parse_int32_type
168 },
169 {
170 NGM_ETHER_COOKIE,
171 NGM_ETHER_SET_AUTOSRC,
172 "setautosrc",
173 &ng_parse_int32_type,
174 NULL
175 },
176 {
177 NGM_ETHER_COOKIE,
178 NGM_ETHER_ADD_MULTI,
179 "addmulti",
180 &ng_parse_enaddr_type,
181 NULL
182 },
183 {
184 NGM_ETHER_COOKIE,
185 NGM_ETHER_DEL_MULTI,
186 "delmulti",
187 &ng_parse_enaddr_type,
188 NULL
189 },
190 {
191 NGM_ETHER_COOKIE,
192 NGM_ETHER_DETACH,
193 "detach",
194 NULL,
195 NULL
196 },
197 { 0 }
198 };
199
200 static struct ng_type ng_ether_typestruct = {
201 .version = NG_ABI_VERSION,
202 .name = NG_ETHER_NODE_TYPE,
203 .mod_event = ng_ether_mod_event,
204 .constructor = ng_ether_constructor,
205 .rcvmsg = ng_ether_rcvmsg,
206 .shutdown = ng_ether_shutdown,
207 .newhook = ng_ether_newhook,
208 .rcvdata = ng_ether_rcvdata,
209 .disconnect = ng_ether_disconnect,
210 .cmdlist = ng_ether_cmdlist,
211 };
212 NETGRAPH_INIT(ether, &ng_ether_typestruct);
213
214 /******************************************************************
215 ETHERNET FUNCTION HOOKS
216 ******************************************************************/
217
218 /*
219 * Handle a packet that has come in on an interface. We get to
220 * look at it here before any upper layer protocols do.
221 *
222 * NOTE: this function will get called at splimp()
223 */
224 static void
225 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
226 {
227 const node_p node = IFP2NG(ifp);
228 const priv_p priv = NG_NODE_PRIVATE(node);
229 int error;
230
231 /* If "lower" hook not connected, let packet continue */
232 if (priv->lower == NULL)
233 return;
234 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
235 }
236
237 /*
238 * Handle a packet that has come in on an interface, and which
239 * does not match any of our known protocols (an ``orphan'').
240 *
241 * NOTE: this function will get called at splimp()
242 */
243 static void
244 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
245 {
246 const node_p node = IFP2NG(ifp);
247 const priv_p priv = NG_NODE_PRIVATE(node);
248 int error;
249
250 /* If "orphan" hook not connected, discard packet */
251 if (priv->orphan == NULL) {
252 m_freem(m);
253 return;
254 }
255 NG_SEND_DATA_ONLY(error, priv->orphan, m);
256 }
257
258 /*
259 * Handle a packet that is going out on an interface.
260 * The Ethernet header is already attached to the mbuf.
261 */
262 static int
263 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
264 {
265 const node_p node = IFP2NG(ifp);
266 const priv_p priv = NG_NODE_PRIVATE(node);
267 int error = 0;
268
269 /* If "upper" hook not connected, let packet continue */
270 if (priv->upper == NULL)
271 return (0);
272
273 /* Send it out "upper" hook */
274 NG_OUTBOUND_THREAD_REF();
275 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
276 NG_OUTBOUND_THREAD_UNREF();
277 return (error);
278 }
279
280 /*
281 * A new Ethernet interface has been attached.
282 * Create a new node for it, etc.
283 */
284 static void
285 ng_ether_attach(struct ifnet *ifp)
286 {
287 priv_p priv;
288 node_p node;
289
290 /*
291 * Do not create / attach an ether node to this ifnet if
292 * a netgraph node with the same name already exists.
293 * This should prevent ether nodes to become attached to
294 * eiface nodes, which may be problematic due to naming
295 * clashes.
296 */
297 if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) {
298 NG_NODE_UNREF(node);
299 return;
300 }
301
302 /* Create node */
303 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
304 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
305 log(LOG_ERR, "%s: can't %s for %s\n",
306 __func__, "create node", ifp->if_xname);
307 return;
308 }
309
310 /* Allocate private data */
311 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
312 if (priv == NULL) {
313 log(LOG_ERR, "%s: can't %s for %s\n",
314 __func__, "allocate memory", ifp->if_xname);
315 NG_NODE_UNREF(node);
316 return;
317 }
318 NG_NODE_SET_PRIVATE(node, priv);
319 priv->ifp = ifp;
320 IFP2NG(ifp) = node;
321 priv->hwassist = ifp->if_hwassist;
322
323 /* Try to give the node the same name as the interface */
324 if (ng_name_node(node, ifp->if_xname) != 0) {
325 log(LOG_WARNING, "%s: can't name node %s\n",
326 __func__, ifp->if_xname);
327 }
328 }
329
330 /*
331 * An Ethernet interface is being detached.
332 * REALLY Destroy its node.
333 */
334 static void
335 ng_ether_detach(struct ifnet *ifp)
336 {
337 const node_p node = IFP2NG(ifp);
338 const priv_p priv = NG_NODE_PRIVATE(node);
339
340 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
341 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
342 /*
343 * We can't assume the ifnet is still around when we run shutdown
344 * So zap it now. XXX We HOPE that anything running at this time
345 * handles it (as it should in the non netgraph case).
346 */
347 IFP2NG(ifp) = NULL;
348 priv->ifp = NULL; /* XXX race if interrupted an output packet */
349 ng_rmnode_self(node); /* remove all netgraph parts */
350 }
351
352 /*
353 * Notify graph about link event.
354 * if_link_state_change() has already checked that the state has changed.
355 */
356 static void
357 ng_ether_link_state(struct ifnet *ifp, int state)
358 {
359 const node_p node = IFP2NG(ifp);
360 const priv_p priv = NG_NODE_PRIVATE(node);
361 struct ng_mesg *msg;
362 int cmd, dummy_error = 0;
363
364 if (state == LINK_STATE_UP)
365 cmd = NGM_LINK_IS_UP;
366 else if (state == LINK_STATE_DOWN)
367 cmd = NGM_LINK_IS_DOWN;
368 else
369 return;
370
371 if (priv->lower != NULL) {
372 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
373 if (msg != NULL)
374 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
375 }
376 if (priv->orphan != NULL) {
377 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
378 if (msg != NULL)
379 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0);
380 }
381 }
382
383 /******************************************************************
384 NETGRAPH NODE METHODS
385 ******************************************************************/
386
387 /*
388 * It is not possible or allowable to create a node of this type.
389 * Nodes get created when the interface is attached (or, when
390 * this node type's KLD is loaded).
391 */
392 static int
393 ng_ether_constructor(node_p node)
394 {
395 return (EINVAL);
396 }
397
398 /*
399 * Check for attaching a new hook.
400 */
401 static int
402 ng_ether_newhook(node_p node, hook_p hook, const char *name)
403 {
404 const priv_p priv = NG_NODE_PRIVATE(node);
405 hook_p *hookptr;
406
407 /* Divert hook is an alias for lower */
408 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
409 name = NG_ETHER_HOOK_LOWER;
410
411 /* Which hook? */
412 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
413 hookptr = &priv->upper;
414 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
415 NG_HOOK_SET_TO_INBOUND(hook);
416 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
417 hookptr = &priv->lower;
418 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
419 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
420 hookptr = &priv->orphan;
421 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
422 } else
423 return (EINVAL);
424
425 /* Check if already connected (shouldn't be, but doesn't hurt) */
426 if (*hookptr != NULL)
427 return (EISCONN);
428
429 /* Disable hardware checksums while 'upper' hook is connected */
430 if (hookptr == &priv->upper)
431 priv->ifp->if_hwassist = 0;
432 NG_HOOK_HI_STACK(hook);
433 /* OK */
434 *hookptr = hook;
435 return (0);
436 }
437
438 /*
439 * Receive an incoming control message.
440 */
441 static int
442 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
443 {
444 const priv_p priv = NG_NODE_PRIVATE(node);
445 struct ng_mesg *resp = NULL;
446 int error = 0;
447 struct ng_mesg *msg;
448
449 NGI_GET_MSG(item, msg);
450 switch (msg->header.typecookie) {
451 case NGM_ETHER_COOKIE:
452 switch (msg->header.cmd) {
453 case NGM_ETHER_GET_IFNAME:
454 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
455 if (resp == NULL) {
456 error = ENOMEM;
457 break;
458 }
459 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
460 break;
461 case NGM_ETHER_GET_IFINDEX:
462 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
463 if (resp == NULL) {
464 error = ENOMEM;
465 break;
466 }
467 *((u_int32_t *)resp->data) = priv->ifp->if_index;
468 break;
469 case NGM_ETHER_GET_ENADDR:
470 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
471 if (resp == NULL) {
472 error = ENOMEM;
473 break;
474 }
475 bcopy(IF_LLADDR(priv->ifp),
476 resp->data, ETHER_ADDR_LEN);
477 break;
478 case NGM_ETHER_SET_ENADDR:
479 {
480 if (msg->header.arglen != ETHER_ADDR_LEN) {
481 error = EINVAL;
482 break;
483 }
484 error = if_setlladdr(priv->ifp,
485 (u_char *)msg->data, ETHER_ADDR_LEN);
486 EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
487 break;
488 }
489 case NGM_ETHER_GET_PROMISC:
490 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
491 if (resp == NULL) {
492 error = ENOMEM;
493 break;
494 }
495 *((u_int32_t *)resp->data) = priv->promisc;
496 break;
497 case NGM_ETHER_SET_PROMISC:
498 {
499 u_char want;
500
501 if (msg->header.arglen != sizeof(u_int32_t)) {
502 error = EINVAL;
503 break;
504 }
505 want = !!*((u_int32_t *)msg->data);
506 if (want ^ priv->promisc) {
507 if ((error = ifpromisc(priv->ifp, want)) != 0)
508 break;
509 priv->promisc = want;
510 }
511 break;
512 }
513 case NGM_ETHER_GET_AUTOSRC:
514 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
515 if (resp == NULL) {
516 error = ENOMEM;
517 break;
518 }
519 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
520 break;
521 case NGM_ETHER_SET_AUTOSRC:
522 if (msg->header.arglen != sizeof(u_int32_t)) {
523 error = EINVAL;
524 break;
525 }
526 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
527 break;
528 case NGM_ETHER_ADD_MULTI:
529 {
530 struct sockaddr_dl sa_dl;
531 struct ifmultiaddr *ifma;
532
533 if (msg->header.arglen != ETHER_ADDR_LEN) {
534 error = EINVAL;
535 break;
536 }
537 bzero(&sa_dl, sizeof(struct sockaddr_dl));
538 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
539 sa_dl.sdl_family = AF_LINK;
540 sa_dl.sdl_alen = ETHER_ADDR_LEN;
541 bcopy((void *)msg->data, LLADDR(&sa_dl),
542 ETHER_ADDR_LEN);
543 /*
544 * Netgraph is only permitted to join groups once
545 * via the if_addmulti() KPI, because it cannot hold
546 * struct ifmultiaddr * between calls. It may also
547 * lose a race while we check if the membership
548 * already exists.
549 */
550 if_maddr_rlock(priv->ifp);
551 ifma = if_findmulti(priv->ifp,
552 (struct sockaddr *)&sa_dl);
553 if_maddr_runlock(priv->ifp);
554 if (ifma != NULL) {
555 error = EADDRINUSE;
556 } else {
557 error = if_addmulti(priv->ifp,
558 (struct sockaddr *)&sa_dl, &ifma);
559 }
560 break;
561 }
562 case NGM_ETHER_DEL_MULTI:
563 {
564 struct sockaddr_dl sa_dl;
565
566 if (msg->header.arglen != ETHER_ADDR_LEN) {
567 error = EINVAL;
568 break;
569 }
570 bzero(&sa_dl, sizeof(struct sockaddr_dl));
571 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
572 sa_dl.sdl_family = AF_LINK;
573 sa_dl.sdl_alen = ETHER_ADDR_LEN;
574 bcopy((void *)msg->data, LLADDR(&sa_dl),
575 ETHER_ADDR_LEN);
576 error = if_delmulti(priv->ifp,
577 (struct sockaddr *)&sa_dl);
578 break;
579 }
580 case NGM_ETHER_DETACH:
581 ng_ether_detach(priv->ifp);
582 break;
583 default:
584 error = EINVAL;
585 break;
586 }
587 break;
588 default:
589 error = EINVAL;
590 break;
591 }
592 NG_RESPOND_MSG(error, node, item, resp);
593 NG_FREE_MSG(msg);
594 return (error);
595 }
596
597 /*
598 * Receive data on a hook.
599 * Since we use per-hook recveive methods this should never be called.
600 */
601 static int
602 ng_ether_rcvdata(hook_p hook, item_p item)
603 {
604 NG_FREE_ITEM(item);
605
606 panic("%s: weird hook", __func__);
607 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */
608 return (0);
609 #endif
610 }
611
612 /*
613 * Handle an mbuf received on the "lower" or "orphan" hook.
614 */
615 static int
616 ng_ether_rcv_lower(hook_p hook, item_p item)
617 {
618 struct mbuf *m;
619 const node_p node = NG_HOOK_NODE(hook);
620 const priv_p priv = NG_NODE_PRIVATE(node);
621 struct ifnet *const ifp = priv->ifp;
622
623 NGI_GET_M(item, m);
624 NG_FREE_ITEM(item);
625
626 /* Check whether interface is ready for packets */
627
628 if (!((ifp->if_flags & IFF_UP) &&
629 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
630 NG_FREE_M(m);
631 return (ENETDOWN);
632 }
633
634 /* Make sure header is fully pulled up */
635 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
636 NG_FREE_M(m);
637 return (EINVAL);
638 }
639 if (m->m_len < sizeof(struct ether_header)
640 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
641 return (ENOBUFS);
642
643 /* Drop in the MAC address if desired */
644 if (priv->autoSrcAddr) {
645
646 /* Make the mbuf writable if it's not already */
647 if (!M_WRITABLE(m)
648 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
649 return (ENOBUFS);
650
651 /* Overwrite source MAC address */
652 bcopy(IF_LLADDR(ifp),
653 mtod(m, struct ether_header *)->ether_shost,
654 ETHER_ADDR_LEN);
655 }
656
657 /* Send it on its way */
658 return ether_output_frame(ifp, m);
659 }
660
661 /*
662 * Handle an mbuf received on the "upper" hook.
663 */
664 static int
665 ng_ether_rcv_upper(hook_p hook, item_p item)
666 {
667 struct mbuf *m;
668 const node_p node = NG_HOOK_NODE(hook);
669 const priv_p priv = NG_NODE_PRIVATE(node);
670 struct ifnet *ifp = priv->ifp;
671
672 NGI_GET_M(item, m);
673 NG_FREE_ITEM(item);
674
675 /* Check length and pull off header */
676 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
677 NG_FREE_M(m);
678 return (EINVAL);
679 }
680 if (m->m_len < sizeof(struct ether_header) &&
681 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
682 return (ENOBUFS);
683
684 m->m_pkthdr.rcvif = ifp;
685
686 /* Pass the packet to the bridge, it may come back to us */
687 if (ifp->if_bridge) {
688 BRIDGE_INPUT(ifp, m);
689 if (m == NULL)
690 return (0);
691 }
692
693 /* Route packet back in */
694 ether_demux(ifp, m);
695 return (0);
696 }
697
698 /*
699 * Shutdown node. This resets the node but does not remove it
700 * unless the REALLY_DIE flag is set.
701 */
702 static int
703 ng_ether_shutdown(node_p node)
704 {
705 const priv_p priv = NG_NODE_PRIVATE(node);
706
707 if (node->nd_flags & NGF_REALLY_DIE) {
708 /*
709 * WE came here because the ethernet card is being unloaded,
710 * so stop being persistant.
711 * Actually undo all the things we did on creation.
712 * Assume the ifp has already been freed.
713 */
714 NG_NODE_SET_PRIVATE(node, NULL);
715 free(priv, M_NETGRAPH);
716 NG_NODE_UNREF(node); /* free node itself */
717 return (0);
718 }
719 if (priv->promisc) { /* disable promiscuous mode */
720 (void)ifpromisc(priv->ifp, 0);
721 priv->promisc = 0;
722 }
723 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
724 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
725
726 return (0);
727 }
728
729 /*
730 * Hook disconnection.
731 */
732 static int
733 ng_ether_disconnect(hook_p hook)
734 {
735 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
736
737 if (hook == priv->upper) {
738 priv->upper = NULL;
739 if (priv->ifp != NULL) /* restore h/w csum */
740 priv->ifp->if_hwassist = priv->hwassist;
741 } else if (hook == priv->lower)
742 priv->lower = NULL;
743 else if (hook == priv->orphan)
744 priv->orphan = NULL;
745 else
746 panic("%s: weird hook", __func__);
747 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
748 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
749 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
750 return (0);
751 }
752
753 /******************************************************************
754 INITIALIZATION
755 ******************************************************************/
756
757 /*
758 * Handle loading and unloading for this node type.
759 */
760 static int
761 ng_ether_mod_event(module_t mod, int event, void *data)
762 {
763 int error = 0;
764 int s;
765
766 s = splnet();
767 switch (event) {
768 case MOD_LOAD:
769
770 /* Register function hooks */
771 if (ng_ether_attach_p != NULL) {
772 error = EEXIST;
773 break;
774 }
775 ng_ether_attach_p = ng_ether_attach;
776 ng_ether_detach_p = ng_ether_detach;
777 ng_ether_output_p = ng_ether_output;
778 ng_ether_input_p = ng_ether_input;
779 ng_ether_input_orphan_p = ng_ether_input_orphan;
780 ng_ether_link_state_p = ng_ether_link_state;
781
782 break;
783
784 case MOD_UNLOAD:
785
786 /*
787 * Note that the base code won't try to unload us until
788 * all nodes have been removed, and that can't happen
789 * until all Ethernet interfaces are removed. In any
790 * case, we know there are no nodes left if the action
791 * is MOD_UNLOAD, so there's no need to detach any nodes.
792 */
793
794 /* Unregister function hooks */
795 ng_ether_attach_p = NULL;
796 ng_ether_detach_p = NULL;
797 ng_ether_output_p = NULL;
798 ng_ether_input_p = NULL;
799 ng_ether_input_orphan_p = NULL;
800 ng_ether_link_state_p = NULL;
801 break;
802
803 default:
804 error = EOPNOTSUPP;
805 break;
806 }
807 splx(s);
808 return (error);
809 }
810
811 static void
812 vnet_ng_ether_init(const void *unused)
813 {
814 struct ifnet *ifp;
815
816 /* If module load was rejected, don't attach to vnets. */
817 if (ng_ether_attach_p != ng_ether_attach)
818 return;
819
820 /* Create nodes for any already-existing Ethernet interfaces. */
821 IFNET_RLOCK();
822 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
823 if (ifp->if_type == IFT_ETHER
824 || ifp->if_type == IFT_L2VLAN)
825 ng_ether_attach(ifp);
826 }
827 IFNET_RUNLOCK();
828 }
829 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
830 vnet_ng_ether_init, NULL);
Cache object: d770683902901ae0572bc8690822e26e
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