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: releng/5.0/sys/netgraph/ng_ether.c 106933 2002-11-14 23:44:37Z sam $
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 */
71 struct 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 };
81 typedef struct private *priv_p;
82
83 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
84 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
85 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
86 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
87 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
88 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
89
90 /* Functional hooks called from if_ethersubr.c */
91 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
92 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
93 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
94 static void ng_ether_attach(struct ifnet *ifp);
95 static void ng_ether_detach(struct ifnet *ifp);
96
97 /* Other functions */
98 static void ng_ether_input2(node_p node, struct mbuf **mp);
99 static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
100 static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
101
102 /* Netgraph node methods */
103 static ng_constructor_t ng_ether_constructor;
104 static ng_rcvmsg_t ng_ether_rcvmsg;
105 static ng_shutdown_t ng_ether_shutdown;
106 static ng_newhook_t ng_ether_newhook;
107 static ng_connect_t ng_ether_connect;
108 static ng_rcvdata_t ng_ether_rcvdata;
109 static ng_disconnect_t ng_ether_disconnect;
110 static int ng_ether_mod_event(module_t mod, int event, void *data);
111
112 /* Parse type for an Ethernet address */
113 static ng_parse_t ng_enaddr_parse;
114 static ng_unparse_t ng_enaddr_unparse;
115 const struct ng_parse_type ng_ether_enaddr_type = {
116 NULL,
117 NULL,
118 NULL,
119 ng_enaddr_parse,
120 ng_enaddr_unparse,
121 NULL, /* no such thing as a "default" EN address */
122 0
123 };
124
125 /* List of commands and how to convert arguments to/from ASCII */
126 static const struct ng_cmdlist ng_ether_cmdlist[] = {
127 {
128 NGM_ETHER_COOKIE,
129 NGM_ETHER_GET_IFNAME,
130 "getifname",
131 NULL,
132 &ng_parse_string_type
133 },
134 {
135 NGM_ETHER_COOKIE,
136 NGM_ETHER_GET_IFINDEX,
137 "getifindex",
138 NULL,
139 &ng_parse_int32_type
140 },
141 {
142 NGM_ETHER_COOKIE,
143 NGM_ETHER_GET_ENADDR,
144 "getenaddr",
145 NULL,
146 &ng_ether_enaddr_type
147 },
148 {
149 NGM_ETHER_COOKIE,
150 NGM_ETHER_SET_ENADDR,
151 "setenaddr",
152 &ng_ether_enaddr_type,
153 NULL
154 },
155 {
156 NGM_ETHER_COOKIE,
157 NGM_ETHER_GET_PROMISC,
158 "getpromisc",
159 NULL,
160 &ng_parse_int32_type
161 },
162 {
163 NGM_ETHER_COOKIE,
164 NGM_ETHER_SET_PROMISC,
165 "setpromisc",
166 &ng_parse_int32_type,
167 NULL
168 },
169 {
170 NGM_ETHER_COOKIE,
171 NGM_ETHER_GET_AUTOSRC,
172 "getautosrc",
173 NULL,
174 &ng_parse_int32_type
175 },
176 {
177 NGM_ETHER_COOKIE,
178 NGM_ETHER_SET_AUTOSRC,
179 "setautosrc",
180 &ng_parse_int32_type,
181 NULL
182 },
183 { 0 }
184 };
185
186 static struct ng_type ng_ether_typestruct = {
187 NG_ABI_VERSION,
188 NG_ETHER_NODE_TYPE,
189 ng_ether_mod_event,
190 ng_ether_constructor,
191 ng_ether_rcvmsg,
192 ng_ether_shutdown,
193 ng_ether_newhook,
194 NULL,
195 ng_ether_connect,
196 ng_ether_rcvdata,
197 ng_ether_disconnect,
198 ng_ether_cmdlist,
199 };
200 MODULE_VERSION(ng_ether, 1);
201 NETGRAPH_INIT(ether, &ng_ether_typestruct);
202
203 /******************************************************************
204 ETHERNET FUNCTION HOOKS
205 ******************************************************************/
206
207 /*
208 * Handle a packet that has come in on an interface. We get to
209 * look at it here before any upper layer protocols do.
210 *
211 * NOTE: this function will get called at splimp()
212 */
213 static void
214 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
215 {
216 const node_p node = IFP2NG(ifp);
217 const priv_p priv = NG_NODE_PRIVATE(node);
218
219 /* If "lower" hook not connected, let packet continue */
220 if (priv->lower == NULL || priv->lowerOrphan)
221 return;
222 ng_ether_input2(node, mp);
223 }
224
225 /*
226 * Handle a packet that has come in on an interface, and which
227 * does not match any of our known protocols (an ``orphan'').
228 *
229 * NOTE: this function will get called at splimp()
230 */
231 static void
232 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
233 {
234 const node_p node = IFP2NG(ifp);
235 const priv_p priv = NG_NODE_PRIVATE(node);
236
237 /* If "orphan" hook not connected, let packet continue */
238 if (priv->lower == NULL || !priv->lowerOrphan) {
239 m_freem(m);
240 return;
241 }
242 ng_ether_input2(node, &m);
243 if (m != NULL)
244 m_freem(m);
245 }
246
247 /*
248 * Handle a packet that has come in on an ethernet interface.
249 * The Ethernet header has already been detached from the mbuf,
250 * so we have to put it back.
251 *
252 * NOTE: this function will get called at splimp()
253 */
254 static void
255 ng_ether_input2(node_p node, struct mbuf **mp)
256 {
257 const priv_p priv = NG_NODE_PRIVATE(node);
258 int error;
259
260 /* Send out lower/orphan hook */
261 NG_SEND_DATA_ONLY(error, priv->lower, *mp);
262 *mp = NULL;
263 }
264
265 /*
266 * Handle a packet that is going out on an interface.
267 * The Ethernet header is already attached to the mbuf.
268 */
269 static int
270 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
271 {
272 const node_p node = IFP2NG(ifp);
273 const priv_p priv = NG_NODE_PRIVATE(node);
274 int error = 0;
275
276 /* If "upper" hook not connected, let packet continue */
277 if (priv->upper == NULL)
278 return (0);
279
280 /* Send it out "upper" hook */
281 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
282 return (error);
283 }
284
285 /*
286 * A new Ethernet interface has been attached.
287 * Create a new node for it, etc.
288 */
289 static void
290 ng_ether_attach(struct ifnet *ifp)
291 {
292 char name[IFNAMSIZ + 1];
293 priv_p priv;
294 node_p node;
295
296 /* Create node */
297 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
298 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit);
299 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
300 log(LOG_ERR, "%s: can't %s for %s\n",
301 __func__, "create node", name);
302 return;
303 }
304
305 /* Allocate private data */
306 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
307 if (priv == NULL) {
308 log(LOG_ERR, "%s: can't %s for %s\n",
309 __func__, "allocate memory", name);
310 NG_NODE_UNREF(node);
311 return;
312 }
313 NG_NODE_SET_PRIVATE(node, priv);
314 priv->ifp = ifp;
315 IFP2NG(ifp) = node;
316 priv->autoSrcAddr = 1;
317 priv->hwassist = ifp->if_hwassist;
318
319 /* Try to give the node the same name as the interface */
320 if (ng_name_node(node, name) != 0) {
321 log(LOG_WARNING, "%s: can't name node %s\n",
322 __func__, name);
323 }
324 }
325
326 /*
327 * An Ethernet interface is being detached.
328 * REALLY Destroy its node.
329 */
330 static void
331 ng_ether_detach(struct ifnet *ifp)
332 {
333 const node_p node = IFP2NG(ifp);
334 const priv_p priv = NG_NODE_PRIVATE(node);
335
336 if (node == NULL) /* no node (why not?), ignore */
337 return;
338 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
339 /*
340 * We can't assume the ifnet is still around when we run shutdown
341 * So zap it now. XXX We HOPE that anything running at this time
342 * handles it (as it should in the non netgraph case).
343 */
344 IFP2NG(ifp) = NULL;
345 priv->ifp = NULL; /* XXX race if interrupted an output packet */
346 ng_rmnode_self(node); /* remove all netgraph parts */
347 }
348
349 /******************************************************************
350 NETGRAPH NODE METHODS
351 ******************************************************************/
352
353 /*
354 * It is not possible or allowable to create a node of this type.
355 * Nodes get created when the interface is attached (or, when
356 * this node type's KLD is loaded).
357 */
358 static int
359 ng_ether_constructor(node_p node)
360 {
361 return (EINVAL);
362 }
363
364 /*
365 * Check for attaching a new hook.
366 */
367 static int
368 ng_ether_newhook(node_p node, hook_p hook, const char *name)
369 {
370 const priv_p priv = NG_NODE_PRIVATE(node);
371 u_char orphan = priv->lowerOrphan;
372 hook_p *hookptr;
373
374 /* Divert hook is an alias for lower */
375 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
376 name = NG_ETHER_HOOK_LOWER;
377
378 /* Which hook? */
379 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
380 hookptr = &priv->upper;
381 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
382 hookptr = &priv->lower;
383 orphan = 0;
384 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
385 hookptr = &priv->lower;
386 orphan = 1;
387 } else
388 return (EINVAL);
389
390 /* Check if already connected (shouldn't be, but doesn't hurt) */
391 if (*hookptr != NULL)
392 return (EISCONN);
393
394 /* Disable hardware checksums while 'upper' hook is connected */
395 if (hookptr == &priv->upper)
396 priv->ifp->if_hwassist = 0;
397
398 /* OK */
399 *hookptr = hook;
400 priv->lowerOrphan = orphan;
401 return (0);
402 }
403
404 /*
405 * Hooks are attached, adjust to force queueing.
406 * We don't really care which hook it is.
407 * they should all be queuing for outgoing data.
408 */
409 static int
410 ng_ether_connect(hook_p hook)
411 {
412 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
413 return (0);
414 }
415
416 /*
417 * Receive an incoming control message.
418 */
419 static int
420 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
421 {
422 const priv_p priv = NG_NODE_PRIVATE(node);
423 struct ng_mesg *resp = NULL;
424 int error = 0;
425 struct ng_mesg *msg;
426
427 NGI_GET_MSG(item, msg);
428 switch (msg->header.typecookie) {
429 case NGM_ETHER_COOKIE:
430 switch (msg->header.cmd) {
431 case NGM_ETHER_GET_IFNAME:
432 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
433 if (resp == NULL) {
434 error = ENOMEM;
435 break;
436 }
437 snprintf(resp->data, IFNAMSIZ + 1,
438 "%s%d", priv->ifp->if_name, priv->ifp->if_unit);
439 break;
440 case NGM_ETHER_GET_IFINDEX:
441 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
442 if (resp == NULL) {
443 error = ENOMEM;
444 break;
445 }
446 *((u_int32_t *)resp->data) = priv->ifp->if_index;
447 break;
448 case NGM_ETHER_GET_ENADDR:
449 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
450 if (resp == NULL) {
451 error = ENOMEM;
452 break;
453 }
454 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
455 resp->data, ETHER_ADDR_LEN);
456 break;
457 case NGM_ETHER_SET_ENADDR:
458 {
459 if (msg->header.arglen != ETHER_ADDR_LEN) {
460 error = EINVAL;
461 break;
462 }
463 error = if_setlladdr(priv->ifp,
464 (u_char *)msg->data, ETHER_ADDR_LEN);
465 break;
466 }
467 case NGM_ETHER_GET_PROMISC:
468 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
469 if (resp == NULL) {
470 error = ENOMEM;
471 break;
472 }
473 *((u_int32_t *)resp->data) = priv->promisc;
474 break;
475 case NGM_ETHER_SET_PROMISC:
476 {
477 u_char want;
478
479 if (msg->header.arglen != sizeof(u_int32_t)) {
480 error = EINVAL;
481 break;
482 }
483 want = !!*((u_int32_t *)msg->data);
484 if (want ^ priv->promisc) {
485 if ((error = ifpromisc(priv->ifp, want)) != 0)
486 break;
487 priv->promisc = want;
488 }
489 break;
490 }
491 case NGM_ETHER_GET_AUTOSRC:
492 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
493 if (resp == NULL) {
494 error = ENOMEM;
495 break;
496 }
497 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
498 break;
499 case NGM_ETHER_SET_AUTOSRC:
500 if (msg->header.arglen != sizeof(u_int32_t)) {
501 error = EINVAL;
502 break;
503 }
504 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
505 break;
506 default:
507 error = EINVAL;
508 break;
509 }
510 break;
511 default:
512 error = EINVAL;
513 break;
514 }
515 NG_RESPOND_MSG(error, node, item, resp);
516 NG_FREE_MSG(msg);
517 return (error);
518 }
519
520 /*
521 * Receive data on a hook.
522 */
523 static int
524 ng_ether_rcvdata(hook_p hook, item_p item)
525 {
526 const node_p node = NG_HOOK_NODE(hook);
527 const priv_p priv = NG_NODE_PRIVATE(node);
528 struct mbuf *m;
529 meta_p meta;
530
531 NGI_GET_M(item, m);
532 NGI_GET_META(item, meta);
533 NG_FREE_ITEM(item);
534 if (hook == priv->lower)
535 return ng_ether_rcv_lower(node, m, meta);
536 if (hook == priv->upper)
537 return ng_ether_rcv_upper(node, m, meta);
538 panic("%s: weird hook", __func__);
539 #ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */
540 return NULL;
541 #endif
542 }
543
544 /*
545 * Handle an mbuf received on the "lower" hook.
546 */
547 static int
548 ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
549 {
550 const priv_p priv = NG_NODE_PRIVATE(node);
551 struct ifnet *const ifp = priv->ifp;
552
553 /* Discard meta info */
554 NG_FREE_META(meta);
555
556 /* Check whether interface is ready for packets */
557 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
558 NG_FREE_M(m);
559 return (ENETDOWN);
560 }
561
562 /* Make sure header is fully pulled up */
563 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
564 NG_FREE_M(m);
565 return (EINVAL);
566 }
567 if (m->m_len < sizeof(struct ether_header)
568 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
569 return (ENOBUFS);
570
571 /* Drop in the MAC address if desired */
572 if (priv->autoSrcAddr) {
573
574 /* Make the mbuf writable if it's not already */
575 if (!M_WRITABLE(m)
576 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
577 return (ENOBUFS);
578
579 /* Overwrite source MAC address */
580 bcopy((IFP2AC(ifp))->ac_enaddr,
581 mtod(m, struct ether_header *)->ether_shost,
582 ETHER_ADDR_LEN);
583 }
584
585 /* Send it on its way */
586 return ether_output_frame(ifp, m);
587 }
588
589 /*
590 * Handle an mbuf received on the "upper" hook.
591 */
592 static int
593 ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
594 {
595 const priv_p priv = NG_NODE_PRIVATE(node);
596
597 /* Discard meta info */
598 NG_FREE_META(meta);
599
600 m->m_pkthdr.rcvif = priv->ifp;
601
602 /* Route packet back in */
603 ether_demux(priv->ifp, m);
604 return (0);
605 }
606
607 /*
608 * Shutdown node. This resets the node but does not remove it
609 * unless the REALLY_DIE flag is set.
610 */
611 static int
612 ng_ether_shutdown(node_p node)
613 {
614 const priv_p priv = NG_NODE_PRIVATE(node);
615
616 if (priv->promisc) { /* disable promiscuous mode */
617 (void)ifpromisc(priv->ifp, 0);
618 priv->promisc = 0;
619 }
620 if (node->nd_flags & NG_REALLY_DIE) {
621 /*
622 * WE came here because the ethernet card is being unloaded,
623 * so stop being persistant.
624 * Actually undo all the things we did on creation.
625 * Assume the ifp has already been freed.
626 */
627 NG_NODE_SET_PRIVATE(node, NULL);
628 FREE(priv, M_NETGRAPH);
629 NG_NODE_UNREF(node); /* free node itself */
630 return (0);
631 }
632 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
633 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */
634 return (0);
635 }
636
637 /*
638 * Hook disconnection.
639 */
640 static int
641 ng_ether_disconnect(hook_p hook)
642 {
643 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
644
645 if (hook == priv->upper) {
646 priv->upper = NULL;
647 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */
648 } else if (hook == priv->lower) {
649 priv->lower = NULL;
650 priv->lowerOrphan = 0;
651 } else
652 panic("%s: weird hook", __func__);
653 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
654 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
655 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
656 return (0);
657 }
658
659 static int
660 ng_enaddr_parse(const struct ng_parse_type *type,
661 const char *s, int *const off, const u_char *const start,
662 u_char *const buf, int *const buflen)
663 {
664 char *eptr;
665 u_long val;
666 int i;
667
668 if (*buflen < ETHER_ADDR_LEN)
669 return (ERANGE);
670 for (i = 0; i < ETHER_ADDR_LEN; i++) {
671 val = strtoul(s + *off, &eptr, 16);
672 if (val > 0xff || eptr == s + *off)
673 return (EINVAL);
674 buf[i] = (u_char)val;
675 *off = (eptr - s);
676 if (i < ETHER_ADDR_LEN - 1) {
677 if (*eptr != ':')
678 return (EINVAL);
679 (*off)++;
680 }
681 }
682 *buflen = ETHER_ADDR_LEN;
683 return (0);
684 }
685
686 static int
687 ng_enaddr_unparse(const struct ng_parse_type *type,
688 const u_char *data, int *off, char *cbuf, int cbuflen)
689 {
690 int len;
691
692 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
693 data[*off], data[*off + 1], data[*off + 2],
694 data[*off + 3], data[*off + 4], data[*off + 5]);
695 if (len >= cbuflen)
696 return (ERANGE);
697 *off += ETHER_ADDR_LEN;
698 return (0);
699 }
700
701 /******************************************************************
702 INITIALIZATION
703 ******************************************************************/
704
705 /*
706 * Handle loading and unloading for this node type.
707 */
708 static int
709 ng_ether_mod_event(module_t mod, int event, void *data)
710 {
711 struct ifnet *ifp;
712 int error = 0;
713 int s;
714
715 s = splnet();
716 switch (event) {
717 case MOD_LOAD:
718
719 /* Register function hooks */
720 if (ng_ether_attach_p != NULL) {
721 error = EEXIST;
722 break;
723 }
724 ng_ether_attach_p = ng_ether_attach;
725 ng_ether_detach_p = ng_ether_detach;
726 ng_ether_output_p = ng_ether_output;
727 ng_ether_input_p = ng_ether_input;
728 ng_ether_input_orphan_p = ng_ether_input_orphan;
729
730 /* Create nodes for any already-existing Ethernet interfaces */
731 TAILQ_FOREACH(ifp, &ifnet, if_link) {
732 if (ifp->if_type == IFT_ETHER
733 || ifp->if_type == IFT_L2VLAN)
734 ng_ether_attach(ifp);
735 }
736 break;
737
738 case MOD_UNLOAD:
739
740 /*
741 * Note that the base code won't try to unload us until
742 * all nodes have been removed, and that can't happen
743 * until all Ethernet interfaces are removed. In any
744 * case, we know there are no nodes left if the action
745 * is MOD_UNLOAD, so there's no need to detach any nodes.
746 */
747
748 /* Unregister function hooks */
749 ng_ether_attach_p = NULL;
750 ng_ether_detach_p = NULL;
751 ng_ether_output_p = NULL;
752 ng_ether_input_p = NULL;
753 ng_ether_input_orphan_p = NULL;
754 break;
755
756 default:
757 error = EOPNOTSUPP;
758 break;
759 }
760 splx(s);
761 return (error);
762 }
763
Cache object: 1711e2d71f4588d54a7739e30ac1ee75
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