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: head/sys/netgraph/ng_ether.c 90249 2002-02-05 18:27:30Z archie $
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 */
71struct 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};
81typedef struct private *priv_p;
82
83/* Functional hooks called from if_ethersubr.c */
84static void ng_ether_input(struct ifnet *ifp,
85 struct mbuf **mp, struct ether_header *eh);
86static void ng_ether_input_orphan(struct ifnet *ifp,
87 struct mbuf *m, struct ether_header *eh);
88static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
89static void ng_ether_attach(struct ifnet *ifp);
90static void ng_ether_detach(struct ifnet *ifp);
91
92/* Other functions */
93static void ng_ether_input2(node_p node,
94 struct mbuf **mp, struct ether_header *eh);
95static int ng_ether_glueback_header(struct mbuf **mp,
96 struct ether_header *eh);
97static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
98static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
99
100/* Netgraph node methods */
101static ng_constructor_t ng_ether_constructor;
102static ng_rcvmsg_t ng_ether_rcvmsg;
103static ng_shutdown_t ng_ether_shutdown;
104static ng_newhook_t ng_ether_newhook;
105static ng_connect_t ng_ether_connect;
106static ng_rcvdata_t ng_ether_rcvdata;
107static ng_disconnect_t ng_ether_disconnect;
108static int ng_ether_mod_event(module_t mod, int event, void *data);
109
110/* Parse type for an Ethernet address */
111static ng_parse_t ng_enaddr_parse;
112static ng_unparse_t ng_enaddr_unparse;
113const struct ng_parse_type ng_ether_enaddr_type = {
114 NULL,
115 NULL,
116 NULL,
117 ng_enaddr_parse,
118 ng_enaddr_unparse,
119 NULL, /* no such thing as a "default" EN address */
120 0
121};
122
123/* List of commands and how to convert arguments to/from ASCII */
124static const struct ng_cmdlist ng_ether_cmdlist[] = {
125 {
126 NGM_ETHER_COOKIE,
127 NGM_ETHER_GET_IFNAME,
128 "getifname",
129 NULL,
130 &ng_parse_string_type
131 },
132 {
133 NGM_ETHER_COOKIE,
134 NGM_ETHER_GET_IFINDEX,
135 "getifindex",
136 NULL,
137 &ng_parse_int32_type
138 },
139 {
140 NGM_ETHER_COOKIE,
141 NGM_ETHER_GET_ENADDR,
142 "getenaddr",
143 NULL,
144 &ng_ether_enaddr_type
145 },
146 {
147 NGM_ETHER_COOKIE,
148 NGM_ETHER_SET_ENADDR,
149 "setenaddr",
150 &ng_ether_enaddr_type,
151 NULL
152 },
153 {
154 NGM_ETHER_COOKIE,
155 NGM_ETHER_GET_PROMISC,
156 "getpromisc",
157 NULL,
158 &ng_parse_int32_type
159 },
160 {
161 NGM_ETHER_COOKIE,
162 NGM_ETHER_SET_PROMISC,
163 "setpromisc",
164 &ng_parse_int32_type,
165 NULL
166 },
167 {
168 NGM_ETHER_COOKIE,
169 NGM_ETHER_GET_AUTOSRC,
170 "getautosrc",
171 NULL,
172 &ng_parse_int32_type
173 },
174 {
175 NGM_ETHER_COOKIE,
176 NGM_ETHER_SET_AUTOSRC,
177 "setautosrc",
178 &ng_parse_int32_type,
179 NULL
180 },
181 { 0 }
182};
183
184static struct ng_type ng_ether_typestruct = {
185 NG_ABI_VERSION,
186 NG_ETHER_NODE_TYPE,
187 ng_ether_mod_event,
188 ng_ether_constructor,
189 ng_ether_rcvmsg,
190 ng_ether_shutdown,
191 ng_ether_newhook,
192 NULL,
193 ng_ether_connect,
194 ng_ether_rcvdata,
195 ng_ether_disconnect,
196 ng_ether_cmdlist,
197};
198MODULE_VERSION(ng_ether, 1);
199NETGRAPH_INIT(ether, &ng_ether_typestruct);
200
201/******************************************************************
202 ETHERNET FUNCTION HOOKS
203******************************************************************/
204
205/*
206 * Handle a packet that has come in on an interface. We get to
207 * look at it here before any upper layer protocols do.
208 *
209 * NOTE: this function will get called at splimp()
210 */
211static void
212ng_ether_input(struct ifnet *ifp,
213 struct mbuf **mp, struct ether_header *eh)
214{
215 const node_p node = IFP2NG(ifp);
216 const priv_p priv = NG_NODE_PRIVATE(node);
217
218 /* If "lower" hook not connected, let packet continue */
219 if (priv->lower == NULL || priv->lowerOrphan)
220 return;
221 ng_ether_input2(node, mp, eh);
222}
223
224/*
225 * Handle a packet that has come in on an interface, and which
226 * does not match any of our known protocols (an ``orphan'').
227 *
228 * NOTE: this function will get called at splimp()
229 */
230static void
231ng_ether_input_orphan(struct ifnet *ifp,
232 struct mbuf *m, struct ether_header *eh)
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, eh);
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 */
254static void
255ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh)
256{
257 const priv_p priv = NG_NODE_PRIVATE(node);
258 int error;
259
260 /* Glue Ethernet header back on */
261 if ((error = ng_ether_glueback_header(mp, eh)) != 0)
262 return;
263
264 /* Send out lower/orphan hook */
265 NG_SEND_DATA_ONLY(error, priv->lower, *mp);
266 *mp = NULL;
267}
268
269/*
270 * Handle a packet that is going out on an interface.
271 * The Ethernet header is already attached to the mbuf.
272 */
273static int
274ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
275{
276 const node_p node = IFP2NG(ifp);
277 const priv_p priv = NG_NODE_PRIVATE(node);
278 int error = 0;
279
280 /* If "upper" hook not connected, let packet continue */
281 if (priv->upper == NULL)
282 return (0);
283
284 /* Send it out "upper" hook */
285 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
286 return (error);
287}
288
289/*
290 * A new Ethernet interface has been attached.
291 * Create a new node for it, etc.
292 */
293static void
294ng_ether_attach(struct ifnet *ifp)
295{
296 char name[IFNAMSIZ + 1];
297 priv_p priv;
298 node_p node;
299
300 /* Create node */
301 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
302 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit);
303 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
304 log(LOG_ERR, "%s: can't %s for %s\n",
305 __func__, "create node", name);
306 return;
307 }
308
309 /* Allocate private data */
310 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
311 if (priv == NULL) {
312 log(LOG_ERR, "%s: can't %s for %s\n",
313 __func__, "allocate memory", name);
314 NG_NODE_UNREF(node);
315 return;
316 }
317 NG_NODE_SET_PRIVATE(node, priv);
318 priv->ifp = ifp;
319 IFP2NG(ifp) = node;
320 priv->autoSrcAddr = 1;
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, name) != 0) {
325 log(LOG_WARNING, "%s: can't name node %s\n",
326 __func__, name);
327 }
328}
329
330/*
331 * An Ethernet interface is being detached.
332 * REALLY Destroy its node.
333 */
334static void
335ng_ether_detach(struct ifnet *ifp)
336{
337 const node_p node = IFP2NG(ifp);
338 const priv_p priv = NG_NODE_PRIVATE(node);
339
340 if (node == NULL) /* no node (why not?), ignore */
341 return;
342 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
343 /*
344 * We can't assume the ifnet is still around when we run shutdown
345 * So zap it now. XXX We HOPE that anything running at this time
346 * handles it (as it should in the non netgraph case).
347 */
348 IFP2NG(ifp) = NULL;
349 priv->ifp = NULL; /* XXX race if interrupted an output packet */
350 ng_rmnode_self(node); /* remove all netgraph parts */
351}
352
353/*
354 * Optimization for gluing the Ethernet header back onto
355 * the front of an incoming packet.
356 */
357static int
358ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh)
359{
360 struct mbuf *m = *mp;
361 uintfptr_t room;
362 int error = 0;
363
364 /*
365 * Possibly the header is already on the front.
366 * If this is the case so just move the markers back
367 * to re-include it. We lucked out.
368 * This allows us to avoid a yucky m_pullup
369 * in later nodes if it works.
370 */
371 if (eh == mtod(m, struct ether_header *) - 1) {
372 m->m_len += sizeof(*eh);
373 m->m_data -= sizeof(*eh);
374 m->m_pkthdr.len += sizeof(*eh);
375 goto done;
376 }
377
378 /*
379 * Alternatively there may be room even though
380 * it is stored somewhere else. If so, copy it in.
381 * This only safe because we KNOW that this packet has
382 * just been generated by an ethernet card, so there are
383 * no aliases to the buffer (not so for outgoing packets).
384 * Nearly all ethernet cards will end up producing mbufs
385 * that fall into these cases. So we are not optimizing
386 * contorted cases.
387 */
388 if ((m->m_flags & M_EXT) != 0) {
389 room = mtod(m, caddr_t) - m->m_ext.ext_buf;
390 if (room > m->m_ext.ext_size) /* garbage, fail immediately */
391 room = 0;
392 } else
393 room = mtod(m, caddr_t) - m->m_pktdat;
394
395 /*
396 * If we have room, just copy it and adjust
397 */
398 if (room >= sizeof(*eh)) {
399 m->m_len += sizeof(*eh);
400 m->m_data -= sizeof(*eh);
401 m->m_pkthdr.len += sizeof(*eh);
402 goto copy;
403 }
404
405 /*
406 * Doing anything more is likely to get more
407 * expensive than it's worth..
408 * it's probable that everything else is in one
409 * big lump. The next node will do an m_pullup()
410 * for exactly the amount of data it needs and
411 * hopefully everything after that will not
412 * need one. So let's just use M_PREPEND.
413 */
414 M_PREPEND(m, sizeof (*eh), M_DONTWAIT);
415 if (m == NULL) {
416 error = ENOBUFS;
417 goto done;
418 }
419
420copy:
421 /* Copy header and return (possibly new) mbuf */
422 bcopy((caddr_t)eh, mtod(m, struct ether_header *), sizeof(*eh));
423done:
424 *mp = m;
425 return error;
426}
427
428/******************************************************************
429 NETGRAPH NODE METHODS
430******************************************************************/
431
432/*
433 * It is not possible or allowable to create a node of this type.
434 * Nodes get created when the interface is attached (or, when
435 * this node type's KLD is loaded).
436 */
437static int
438ng_ether_constructor(node_p node)
439{
440 return (EINVAL);
441}
442
443/*
444 * Check for attaching a new hook.
445 */
446static int
447ng_ether_newhook(node_p node, hook_p hook, const char *name)
448{
449 const priv_p priv = NG_NODE_PRIVATE(node);
450 u_char orphan = priv->lowerOrphan;
451 hook_p *hookptr;
452
453 /* Divert hook is an alias for lower */
454 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
455 name = NG_ETHER_HOOK_LOWER;
456
457 /* Which hook? */
458 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
459 hookptr = &priv->upper;
460 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
461 hookptr = &priv->lower;
462 orphan = 0;
463 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
464 hookptr = &priv->lower;
465 orphan = 1;
466 } else
467 return (EINVAL);
468
469 /* Check if already connected (shouldn't be, but doesn't hurt) */
470 if (*hookptr != NULL)
471 return (EISCONN);
472
473 /* Disable hardware checksums while 'upper' hook is connected */
474 if (hookptr == &priv->upper)
475 priv->ifp->if_hwassist = 0;
476
477 /* OK */
478 *hookptr = hook;
479 priv->lowerOrphan = orphan;
480 return (0);
481}
482
483/*
484 * Hooks are attached, adjust to force queueing.
485 * We don't really care which hook it is.
486 * they should all be queuing for outgoing data.
487 */
488static int
489ng_ether_connect(hook_p hook)
490{
491 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
492 return (0);
493}
494
495/*
496 * Receive an incoming control message.
497 */
498static int
499ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
500{
501 const priv_p priv = NG_NODE_PRIVATE(node);
502 struct ng_mesg *resp = NULL;
503 int error = 0;
504 struct ng_mesg *msg;
505
506 NGI_GET_MSG(item, msg);
507 switch (msg->header.typecookie) {
508 case NGM_ETHER_COOKIE:
509 switch (msg->header.cmd) {
510 case NGM_ETHER_GET_IFNAME:
511 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
512 if (resp == NULL) {
513 error = ENOMEM;
514 break;
515 }
516 snprintf(resp->data, IFNAMSIZ + 1,
517 "%s%d", priv->ifp->if_name, priv->ifp->if_unit);
518 break;
519 case NGM_ETHER_GET_IFINDEX:
520 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
521 if (resp == NULL) {
522 error = ENOMEM;
523 break;
524 }
525 *((u_int32_t *)resp->data) = priv->ifp->if_index;
526 break;
527 case NGM_ETHER_GET_ENADDR:
528 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
529 if (resp == NULL) {
530 error = ENOMEM;
531 break;
532 }
533 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
534 resp->data, ETHER_ADDR_LEN);
535 break;
536 case NGM_ETHER_SET_ENADDR:
537 {
538 if (msg->header.arglen != ETHER_ADDR_LEN) {
539 error = EINVAL;
540 break;
541 }
542 error = if_setlladdr(priv->ifp,
543 (u_char *)msg->data, ETHER_ADDR_LEN);
544 break;
545 }
546 case NGM_ETHER_GET_PROMISC:
547 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
548 if (resp == NULL) {
549 error = ENOMEM;
550 break;
551 }
552 *((u_int32_t *)resp->data) = priv->promisc;
553 break;
554 case NGM_ETHER_SET_PROMISC:
555 {
556 u_char want;
557
558 if (msg->header.arglen != sizeof(u_int32_t)) {
559 error = EINVAL;
560 break;
561 }
562 want = !!*((u_int32_t *)msg->data);
563 if (want ^ priv->promisc) {
564 if ((error = ifpromisc(priv->ifp, want)) != 0)
565 break;
566 priv->promisc = want;
567 }
568 break;
569 }
570 case NGM_ETHER_GET_AUTOSRC:
571 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
572 if (resp == NULL) {
573 error = ENOMEM;
574 break;
575 }
576 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
577 break;
578 case NGM_ETHER_SET_AUTOSRC:
579 if (msg->header.arglen != sizeof(u_int32_t)) {
580 error = EINVAL;
581 break;
582 }
583 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
584 break;
585 default:
586 error = EINVAL;
587 break;
588 }
589 break;
590 default:
591 error = EINVAL;
592 break;
593 }
594 NG_RESPOND_MSG(error, node, item, resp);
595 NG_FREE_MSG(msg);
596 return (error);
597}
598
599/*
600 * Receive data on a hook.
601 */
602static int
603ng_ether_rcvdata(hook_p hook, item_p item)
604{
605 const node_p node = NG_HOOK_NODE(hook);
606 const priv_p priv = NG_NODE_PRIVATE(node);
607 struct mbuf *m;
608 meta_p meta;
609
610 NGI_GET_M(item, m);
611 NGI_GET_META(item, meta);
612 NG_FREE_ITEM(item);
613 if (hook == priv->lower)
614 return ng_ether_rcv_lower(node, m, meta);
615 if (hook == priv->upper)
616 return ng_ether_rcv_upper(node, m, meta);
617 panic("%s: weird hook", __func__);
618#ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */
619 return NULL;
620#endif
621}
622
623/*
624 * Handle an mbuf received on the "lower" hook.
625 */
626static int
627ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
628{
629 const priv_p priv = NG_NODE_PRIVATE(node);
630
631 /* Make sure header is fully pulled up */
632 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
633 NG_FREE_M(m);
634 NG_FREE_META(meta);
635 return (EINVAL);
636 }
637 if (m->m_len < sizeof(struct ether_header)
638 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) {
639 NG_FREE_META(meta);
640 return (ENOBUFS);
641 }
642
643 /* Drop in the MAC address if desired */
644 if (priv->autoSrcAddr) {
645 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
646 mtod(m, struct ether_header *)->ether_shost,
647 ETHER_ADDR_LEN);
648 }
649
650 /* Send it on its way */
651 NG_FREE_META(meta);
652 return ether_output_frame(priv->ifp, m);
653}
654
655/*
656 * Handle an mbuf received on the "upper" hook.
657 */
658static int
659ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
660{
661 const priv_p priv = NG_NODE_PRIVATE(node);
662 struct ether_header *eh;
663
664 /* Check length and pull off header */
665 if (m->m_pkthdr.len < sizeof(*eh)) {
666 NG_FREE_M(m);
667 NG_FREE_META(meta);
668 return (EINVAL);
669 }
670 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL) {
671 NG_FREE_META(meta);
672 return (ENOBUFS);
673 }
674 eh = mtod(m, struct ether_header *);
675 m->m_data += sizeof(*eh);
676 m->m_len -= sizeof(*eh);
677 m->m_pkthdr.len -= sizeof(*eh);
678 m->m_pkthdr.rcvif = priv->ifp;
679
680 /* Route packet back in */
681 NG_FREE_META(meta);
682 ether_demux(priv->ifp, eh, m);
683 return (0);
684}
685
686/*
687 * Shutdown node. This resets the node but does not remove it
688 * unless the REALLY_DIE flag is set.
689 */
690static int
691ng_ether_shutdown(node_p node)
692{
693 const priv_p priv = NG_NODE_PRIVATE(node);
694
695 if (priv->promisc) { /* disable promiscuous mode */
696 (void)ifpromisc(priv->ifp, 0);
697 priv->promisc = 0;
698 }
699 if (node->nd_flags & NG_REALLY_DIE) {
700 /*
701 * WE came here because the ethernet card is being unloaded,
702 * so stop being persistant.
703 * Actually undo all the things we did on creation.
704 * Assume the ifp has already been freed.
705 */
706 NG_NODE_SET_PRIVATE(node, NULL);
707 FREE(priv, M_NETGRAPH);
708 NG_NODE_UNREF(node); /* free node itself */
709 return (0);
710 }
711 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
712 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */
713 return (0);
714}
715
716/*
717 * Hook disconnection.
718 */
719static int
720ng_ether_disconnect(hook_p hook)
721{
722 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
723
724 if (hook == priv->upper) {
725 priv->upper = NULL;
726 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */
727 } else if (hook == priv->lower) {
728 priv->lower = NULL;
729 priv->lowerOrphan = 0;
730 } else
731 panic("%s: weird hook", __func__);
732 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
733 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
734 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
735 return (0);
736}
737
738static int
739ng_enaddr_parse(const struct ng_parse_type *type,
740 const char *s, int *const off, const u_char *const start,
741 u_char *const buf, int *const buflen)
742{
743 char *eptr;
744 u_long val;
745 int i;
746
747 if (*buflen < ETHER_ADDR_LEN)
748 return (ERANGE);
749 for (i = 0; i < ETHER_ADDR_LEN; i++) {
750 val = strtoul(s + *off, &eptr, 16);
751 if (val > 0xff || eptr == s + *off)
752 return (EINVAL);
753 buf[i] = (u_char)val;
754 *off = (eptr - s);
755 if (i < ETHER_ADDR_LEN - 1) {
756 if (*eptr != ':')
757 return (EINVAL);
758 (*off)++;
759 }
760 }
761 *buflen = ETHER_ADDR_LEN;
762 return (0);
763}
764
765static int
766ng_enaddr_unparse(const struct ng_parse_type *type,
767 const u_char *data, int *off, char *cbuf, int cbuflen)
768{
769 int len;
770
771 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
772 data[*off], data[*off + 1], data[*off + 2],
773 data[*off + 3], data[*off + 4], data[*off + 5]);
774 if (len >= cbuflen)
775 return (ERANGE);
776 *off += ETHER_ADDR_LEN;
777 return (0);
778}
779
780/******************************************************************
781 INITIALIZATION
782******************************************************************/
783
784/*
785 * Handle loading and unloading for this node type.
786 */
787static int
788ng_ether_mod_event(module_t mod, int event, void *data)
789{
790 struct ifnet *ifp;
791 int error = 0;
792 int s;
793
794 s = splnet();
795 switch (event) {
796 case MOD_LOAD:
797
798 /* Register function hooks */
799 if (ng_ether_attach_p != NULL) {
800 error = EEXIST;
801 break;
802 }
803 ng_ether_attach_p = ng_ether_attach;
804 ng_ether_detach_p = ng_ether_detach;
805 ng_ether_output_p = ng_ether_output;
806 ng_ether_input_p = ng_ether_input;
807 ng_ether_input_orphan_p = ng_ether_input_orphan;
808
809 /* Create nodes for any already-existing Ethernet interfaces */
810 TAILQ_FOREACH(ifp, &ifnet, if_link) {
811 if (ifp->if_type == IFT_ETHER
812 || ifp->if_type == IFT_L2VLAN)
813 ng_ether_attach(ifp);
814 }
815 break;
816
817 case MOD_UNLOAD:
818
819 /*
820 * Note that the base code won't try to unload us until
821 * all nodes have been removed, and that can't happen
822 * until all Ethernet interfaces are removed. In any
823 * case, we know there are no nodes left if the action
824 * is MOD_UNLOAD, so there's no need to detach any nodes.
825 */
826
827 /* Unregister function hooks */
828 ng_ether_attach_p = NULL;
829 ng_ether_detach_p = NULL;
830 ng_ether_output_p = NULL;
831 ng_ether_input_p = NULL;
832 ng_ether_input_orphan_p = NULL;
833 break;
834
835 default:
836 error = EOPNOTSUPP;
837 break;
838 }
839 splx(s);
840 return (error);
841}
842
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: head/sys/netgraph/ng_ether.c 90249 2002-02-05 18:27:30Z archie $
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 */
71struct 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};
81typedef struct private *priv_p;
82
83/* Functional hooks called from if_ethersubr.c */
84static void ng_ether_input(struct ifnet *ifp,
85 struct mbuf **mp, struct ether_header *eh);
86static void ng_ether_input_orphan(struct ifnet *ifp,
87 struct mbuf *m, struct ether_header *eh);
88static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
89static void ng_ether_attach(struct ifnet *ifp);
90static void ng_ether_detach(struct ifnet *ifp);
91
92/* Other functions */
93static void ng_ether_input2(node_p node,
94 struct mbuf **mp, struct ether_header *eh);
95static int ng_ether_glueback_header(struct mbuf **mp,
96 struct ether_header *eh);
97static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
98static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
99
100/* Netgraph node methods */
101static ng_constructor_t ng_ether_constructor;
102static ng_rcvmsg_t ng_ether_rcvmsg;
103static ng_shutdown_t ng_ether_shutdown;
104static ng_newhook_t ng_ether_newhook;
105static ng_connect_t ng_ether_connect;
106static ng_rcvdata_t ng_ether_rcvdata;
107static ng_disconnect_t ng_ether_disconnect;
108static int ng_ether_mod_event(module_t mod, int event, void *data);
109
110/* Parse type for an Ethernet address */
111static ng_parse_t ng_enaddr_parse;
112static ng_unparse_t ng_enaddr_unparse;
113const struct ng_parse_type ng_ether_enaddr_type = {
114 NULL,
115 NULL,
116 NULL,
117 ng_enaddr_parse,
118 ng_enaddr_unparse,
119 NULL, /* no such thing as a "default" EN address */
120 0
121};
122
123/* List of commands and how to convert arguments to/from ASCII */
124static const struct ng_cmdlist ng_ether_cmdlist[] = {
125 {
126 NGM_ETHER_COOKIE,
127 NGM_ETHER_GET_IFNAME,
128 "getifname",
129 NULL,
130 &ng_parse_string_type
131 },
132 {
133 NGM_ETHER_COOKIE,
134 NGM_ETHER_GET_IFINDEX,
135 "getifindex",
136 NULL,
137 &ng_parse_int32_type
138 },
139 {
140 NGM_ETHER_COOKIE,
141 NGM_ETHER_GET_ENADDR,
142 "getenaddr",
143 NULL,
144 &ng_ether_enaddr_type
145 },
146 {
147 NGM_ETHER_COOKIE,
148 NGM_ETHER_SET_ENADDR,
149 "setenaddr",
150 &ng_ether_enaddr_type,
151 NULL
152 },
153 {
154 NGM_ETHER_COOKIE,
155 NGM_ETHER_GET_PROMISC,
156 "getpromisc",
157 NULL,
158 &ng_parse_int32_type
159 },
160 {
161 NGM_ETHER_COOKIE,
162 NGM_ETHER_SET_PROMISC,
163 "setpromisc",
164 &ng_parse_int32_type,
165 NULL
166 },
167 {
168 NGM_ETHER_COOKIE,
169 NGM_ETHER_GET_AUTOSRC,
170 "getautosrc",
171 NULL,
172 &ng_parse_int32_type
173 },
174 {
175 NGM_ETHER_COOKIE,
176 NGM_ETHER_SET_AUTOSRC,
177 "setautosrc",
178 &ng_parse_int32_type,
179 NULL
180 },
181 { 0 }
182};
183
184static struct ng_type ng_ether_typestruct = {
185 NG_ABI_VERSION,
186 NG_ETHER_NODE_TYPE,
187 ng_ether_mod_event,
188 ng_ether_constructor,
189 ng_ether_rcvmsg,
190 ng_ether_shutdown,
191 ng_ether_newhook,
192 NULL,
193 ng_ether_connect,
194 ng_ether_rcvdata,
195 ng_ether_disconnect,
196 ng_ether_cmdlist,
197};
198MODULE_VERSION(ng_ether, 1);
199NETGRAPH_INIT(ether, &ng_ether_typestruct);
200
201/******************************************************************
202 ETHERNET FUNCTION HOOKS
203******************************************************************/
204
205/*
206 * Handle a packet that has come in on an interface. We get to
207 * look at it here before any upper layer protocols do.
208 *
209 * NOTE: this function will get called at splimp()
210 */
211static void
212ng_ether_input(struct ifnet *ifp,
213 struct mbuf **mp, struct ether_header *eh)
214{
215 const node_p node = IFP2NG(ifp);
216 const priv_p priv = NG_NODE_PRIVATE(node);
217
218 /* If "lower" hook not connected, let packet continue */
219 if (priv->lower == NULL || priv->lowerOrphan)
220 return;
221 ng_ether_input2(node, mp, eh);
222}
223
224/*
225 * Handle a packet that has come in on an interface, and which
226 * does not match any of our known protocols (an ``orphan'').
227 *
228 * NOTE: this function will get called at splimp()
229 */
230static void
231ng_ether_input_orphan(struct ifnet *ifp,
232 struct mbuf *m, struct ether_header *eh)
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, eh);
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 */
254static void
255ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh)
256{
257 const priv_p priv = NG_NODE_PRIVATE(node);
258 int error;
259
260 /* Glue Ethernet header back on */
261 if ((error = ng_ether_glueback_header(mp, eh)) != 0)
262 return;
263
264 /* Send out lower/orphan hook */
265 NG_SEND_DATA_ONLY(error, priv->lower, *mp);
266 *mp = NULL;
267}
268
269/*
270 * Handle a packet that is going out on an interface.
271 * The Ethernet header is already attached to the mbuf.
272 */
273static int
274ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
275{
276 const node_p node = IFP2NG(ifp);
277 const priv_p priv = NG_NODE_PRIVATE(node);
278 int error = 0;
279
280 /* If "upper" hook not connected, let packet continue */
281 if (priv->upper == NULL)
282 return (0);
283
284 /* Send it out "upper" hook */
285 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
286 return (error);
287}
288
289/*
290 * A new Ethernet interface has been attached.
291 * Create a new node for it, etc.
292 */
293static void
294ng_ether_attach(struct ifnet *ifp)
295{
296 char name[IFNAMSIZ + 1];
297 priv_p priv;
298 node_p node;
299
300 /* Create node */
301 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
302 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit);
303 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
304 log(LOG_ERR, "%s: can't %s for %s\n",
305 __func__, "create node", name);
306 return;
307 }
308
309 /* Allocate private data */
310 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
311 if (priv == NULL) {
312 log(LOG_ERR, "%s: can't %s for %s\n",
313 __func__, "allocate memory", name);
314 NG_NODE_UNREF(node);
315 return;
316 }
317 NG_NODE_SET_PRIVATE(node, priv);
318 priv->ifp = ifp;
319 IFP2NG(ifp) = node;
320 priv->autoSrcAddr = 1;
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, name) != 0) {
325 log(LOG_WARNING, "%s: can't name node %s\n",
326 __func__, name);
327 }
328}
329
330/*
331 * An Ethernet interface is being detached.
332 * REALLY Destroy its node.
333 */
334static void
335ng_ether_detach(struct ifnet *ifp)
336{
337 const node_p node = IFP2NG(ifp);
338 const priv_p priv = NG_NODE_PRIVATE(node);
339
340 if (node == NULL) /* no node (why not?), ignore */
341 return;
342 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
343 /*
344 * We can't assume the ifnet is still around when we run shutdown
345 * So zap it now. XXX We HOPE that anything running at this time
346 * handles it (as it should in the non netgraph case).
347 */
348 IFP2NG(ifp) = NULL;
349 priv->ifp = NULL; /* XXX race if interrupted an output packet */
350 ng_rmnode_self(node); /* remove all netgraph parts */
351}
352
353/*
354 * Optimization for gluing the Ethernet header back onto
355 * the front of an incoming packet.
356 */
357static int
358ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh)
359{
360 struct mbuf *m = *mp;
361 uintfptr_t room;
362 int error = 0;
363
364 /*
365 * Possibly the header is already on the front.
366 * If this is the case so just move the markers back
367 * to re-include it. We lucked out.
368 * This allows us to avoid a yucky m_pullup
369 * in later nodes if it works.
370 */
371 if (eh == mtod(m, struct ether_header *) - 1) {
372 m->m_len += sizeof(*eh);
373 m->m_data -= sizeof(*eh);
374 m->m_pkthdr.len += sizeof(*eh);
375 goto done;
376 }
377
378 /*
379 * Alternatively there may be room even though
380 * it is stored somewhere else. If so, copy it in.
381 * This only safe because we KNOW that this packet has
382 * just been generated by an ethernet card, so there are
383 * no aliases to the buffer (not so for outgoing packets).
384 * Nearly all ethernet cards will end up producing mbufs
385 * that fall into these cases. So we are not optimizing
386 * contorted cases.
387 */
388 if ((m->m_flags & M_EXT) != 0) {
389 room = mtod(m, caddr_t) - m->m_ext.ext_buf;
390 if (room > m->m_ext.ext_size) /* garbage, fail immediately */
391 room = 0;
392 } else
393 room = mtod(m, caddr_t) - m->m_pktdat;
394
395 /*
396 * If we have room, just copy it and adjust
397 */
398 if (room >= sizeof(*eh)) {
399 m->m_len += sizeof(*eh);
400 m->m_data -= sizeof(*eh);
401 m->m_pkthdr.len += sizeof(*eh);
402 goto copy;
403 }
404
405 /*
406 * Doing anything more is likely to get more
407 * expensive than it's worth..
408 * it's probable that everything else is in one
409 * big lump. The next node will do an m_pullup()
410 * for exactly the amount of data it needs and
411 * hopefully everything after that will not
412 * need one. So let's just use M_PREPEND.
413 */
414 M_PREPEND(m, sizeof (*eh), M_DONTWAIT);
415 if (m == NULL) {
416 error = ENOBUFS;
417 goto done;
418 }
419
420copy:
421 /* Copy header and return (possibly new) mbuf */
422 bcopy((caddr_t)eh, mtod(m, struct ether_header *), sizeof(*eh));
423done:
424 *mp = m;
425 return error;
426}
427
428/******************************************************************
429 NETGRAPH NODE METHODS
430******************************************************************/
431
432/*
433 * It is not possible or allowable to create a node of this type.
434 * Nodes get created when the interface is attached (or, when
435 * this node type's KLD is loaded).
436 */
437static int
438ng_ether_constructor(node_p node)
439{
440 return (EINVAL);
441}
442
443/*
444 * Check for attaching a new hook.
445 */
446static int
447ng_ether_newhook(node_p node, hook_p hook, const char *name)
448{
449 const priv_p priv = NG_NODE_PRIVATE(node);
450 u_char orphan = priv->lowerOrphan;
451 hook_p *hookptr;
452
453 /* Divert hook is an alias for lower */
454 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
455 name = NG_ETHER_HOOK_LOWER;
456
457 /* Which hook? */
458 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
459 hookptr = &priv->upper;
460 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
461 hookptr = &priv->lower;
462 orphan = 0;
463 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
464 hookptr = &priv->lower;
465 orphan = 1;
466 } else
467 return (EINVAL);
468
469 /* Check if already connected (shouldn't be, but doesn't hurt) */
470 if (*hookptr != NULL)
471 return (EISCONN);
472
473 /* Disable hardware checksums while 'upper' hook is connected */
474 if (hookptr == &priv->upper)
475 priv->ifp->if_hwassist = 0;
476
477 /* OK */
478 *hookptr = hook;
479 priv->lowerOrphan = orphan;
480 return (0);
481}
482
483/*
484 * Hooks are attached, adjust to force queueing.
485 * We don't really care which hook it is.
486 * they should all be queuing for outgoing data.
487 */
488static int
489ng_ether_connect(hook_p hook)
490{
491 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
492 return (0);
493}
494
495/*
496 * Receive an incoming control message.
497 */
498static int
499ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
500{
501 const priv_p priv = NG_NODE_PRIVATE(node);
502 struct ng_mesg *resp = NULL;
503 int error = 0;
504 struct ng_mesg *msg;
505
506 NGI_GET_MSG(item, msg);
507 switch (msg->header.typecookie) {
508 case NGM_ETHER_COOKIE:
509 switch (msg->header.cmd) {
510 case NGM_ETHER_GET_IFNAME:
511 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
512 if (resp == NULL) {
513 error = ENOMEM;
514 break;
515 }
516 snprintf(resp->data, IFNAMSIZ + 1,
517 "%s%d", priv->ifp->if_name, priv->ifp->if_unit);
518 break;
519 case NGM_ETHER_GET_IFINDEX:
520 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
521 if (resp == NULL) {
522 error = ENOMEM;
523 break;
524 }
525 *((u_int32_t *)resp->data) = priv->ifp->if_index;
526 break;
527 case NGM_ETHER_GET_ENADDR:
528 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
529 if (resp == NULL) {
530 error = ENOMEM;
531 break;
532 }
533 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
534 resp->data, ETHER_ADDR_LEN);
535 break;
536 case NGM_ETHER_SET_ENADDR:
537 {
538 if (msg->header.arglen != ETHER_ADDR_LEN) {
539 error = EINVAL;
540 break;
541 }
542 error = if_setlladdr(priv->ifp,
543 (u_char *)msg->data, ETHER_ADDR_LEN);
544 break;
545 }
546 case NGM_ETHER_GET_PROMISC:
547 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
548 if (resp == NULL) {
549 error = ENOMEM;
550 break;
551 }
552 *((u_int32_t *)resp->data) = priv->promisc;
553 break;
554 case NGM_ETHER_SET_PROMISC:
555 {
556 u_char want;
557
558 if (msg->header.arglen != sizeof(u_int32_t)) {
559 error = EINVAL;
560 break;
561 }
562 want = !!*((u_int32_t *)msg->data);
563 if (want ^ priv->promisc) {
564 if ((error = ifpromisc(priv->ifp, want)) != 0)
565 break;
566 priv->promisc = want;
567 }
568 break;
569 }
570 case NGM_ETHER_GET_AUTOSRC:
571 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
572 if (resp == NULL) {
573 error = ENOMEM;
574 break;
575 }
576 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
577 break;
578 case NGM_ETHER_SET_AUTOSRC:
579 if (msg->header.arglen != sizeof(u_int32_t)) {
580 error = EINVAL;
581 break;
582 }
583 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
584 break;
585 default:
586 error = EINVAL;
587 break;
588 }
589 break;
590 default:
591 error = EINVAL;
592 break;
593 }
594 NG_RESPOND_MSG(error, node, item, resp);
595 NG_FREE_MSG(msg);
596 return (error);
597}
598
599/*
600 * Receive data on a hook.
601 */
602static int
603ng_ether_rcvdata(hook_p hook, item_p item)
604{
605 const node_p node = NG_HOOK_NODE(hook);
606 const priv_p priv = NG_NODE_PRIVATE(node);
607 struct mbuf *m;
608 meta_p meta;
609
610 NGI_GET_M(item, m);
611 NGI_GET_META(item, meta);
612 NG_FREE_ITEM(item);
613 if (hook == priv->lower)
614 return ng_ether_rcv_lower(node, m, meta);
615 if (hook == priv->upper)
616 return ng_ether_rcv_upper(node, m, meta);
617 panic("%s: weird hook", __func__);
618#ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */
619 return NULL;
620#endif
621}
622
623/*
624 * Handle an mbuf received on the "lower" hook.
625 */
626static int
627ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
628{
629 const priv_p priv = NG_NODE_PRIVATE(node);
630
631 /* Make sure header is fully pulled up */
632 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
633 NG_FREE_M(m);
634 NG_FREE_META(meta);
635 return (EINVAL);
636 }
637 if (m->m_len < sizeof(struct ether_header)
638 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL) {
639 NG_FREE_META(meta);
640 return (ENOBUFS);
641 }
642
643 /* Drop in the MAC address if desired */
644 if (priv->autoSrcAddr) {
645 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
646 mtod(m, struct ether_header *)->ether_shost,
647 ETHER_ADDR_LEN);
648 }
649
650 /* Send it on its way */
651 NG_FREE_META(meta);
652 return ether_output_frame(priv->ifp, m);
653}
654
655/*
656 * Handle an mbuf received on the "upper" hook.
657 */
658static int
659ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
660{
661 const priv_p priv = NG_NODE_PRIVATE(node);
662 struct ether_header *eh;
663
664 /* Check length and pull off header */
665 if (m->m_pkthdr.len < sizeof(*eh)) {
666 NG_FREE_M(m);
667 NG_FREE_META(meta);
668 return (EINVAL);
669 }
670 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL) {
671 NG_FREE_META(meta);
672 return (ENOBUFS);
673 }
674 eh = mtod(m, struct ether_header *);
675 m->m_data += sizeof(*eh);
676 m->m_len -= sizeof(*eh);
677 m->m_pkthdr.len -= sizeof(*eh);
678 m->m_pkthdr.rcvif = priv->ifp;
679
680 /* Route packet back in */
681 NG_FREE_META(meta);
682 ether_demux(priv->ifp, eh, m);
683 return (0);
684}
685
686/*
687 * Shutdown node. This resets the node but does not remove it
688 * unless the REALLY_DIE flag is set.
689 */
690static int
691ng_ether_shutdown(node_p node)
692{
693 const priv_p priv = NG_NODE_PRIVATE(node);
694
695 if (priv->promisc) { /* disable promiscuous mode */
696 (void)ifpromisc(priv->ifp, 0);
697 priv->promisc = 0;
698 }
699 if (node->nd_flags & NG_REALLY_DIE) {
700 /*
701 * WE came here because the ethernet card is being unloaded,
702 * so stop being persistant.
703 * Actually undo all the things we did on creation.
704 * Assume the ifp has already been freed.
705 */
706 NG_NODE_SET_PRIVATE(node, NULL);
707 FREE(priv, M_NETGRAPH);
708 NG_NODE_UNREF(node); /* free node itself */
709 return (0);
710 }
711 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
712 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */
713 return (0);
714}
715
716/*
717 * Hook disconnection.
718 */
719static int
720ng_ether_disconnect(hook_p hook)
721{
722 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
723
724 if (hook == priv->upper) {
725 priv->upper = NULL;
726 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */
727 } else if (hook == priv->lower) {
728 priv->lower = NULL;
729 priv->lowerOrphan = 0;
730 } else
731 panic("%s: weird hook", __func__);
732 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
733 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
734 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
735 return (0);
736}
737
738static int
739ng_enaddr_parse(const struct ng_parse_type *type,
740 const char *s, int *const off, const u_char *const start,
741 u_char *const buf, int *const buflen)
742{
743 char *eptr;
744 u_long val;
745 int i;
746
747 if (*buflen < ETHER_ADDR_LEN)
748 return (ERANGE);
749 for (i = 0; i < ETHER_ADDR_LEN; i++) {
750 val = strtoul(s + *off, &eptr, 16);
751 if (val > 0xff || eptr == s + *off)
752 return (EINVAL);
753 buf[i] = (u_char)val;
754 *off = (eptr - s);
755 if (i < ETHER_ADDR_LEN - 1) {
756 if (*eptr != ':')
757 return (EINVAL);
758 (*off)++;
759 }
760 }
761 *buflen = ETHER_ADDR_LEN;
762 return (0);
763}
764
765static int
766ng_enaddr_unparse(const struct ng_parse_type *type,
767 const u_char *data, int *off, char *cbuf, int cbuflen)
768{
769 int len;
770
771 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
772 data[*off], data[*off + 1], data[*off + 2],
773 data[*off + 3], data[*off + 4], data[*off + 5]);
774 if (len >= cbuflen)
775 return (ERANGE);
776 *off += ETHER_ADDR_LEN;
777 return (0);
778}
779
780/******************************************************************
781 INITIALIZATION
782******************************************************************/
783
784/*
785 * Handle loading and unloading for this node type.
786 */
787static int
788ng_ether_mod_event(module_t mod, int event, void *data)
789{
790 struct ifnet *ifp;
791 int error = 0;
792 int s;
793
794 s = splnet();
795 switch (event) {
796 case MOD_LOAD:
797
798 /* Register function hooks */
799 if (ng_ether_attach_p != NULL) {
800 error = EEXIST;
801 break;
802 }
803 ng_ether_attach_p = ng_ether_attach;
804 ng_ether_detach_p = ng_ether_detach;
805 ng_ether_output_p = ng_ether_output;
806 ng_ether_input_p = ng_ether_input;
807 ng_ether_input_orphan_p = ng_ether_input_orphan;
808
809 /* Create nodes for any already-existing Ethernet interfaces */
810 TAILQ_FOREACH(ifp, &ifnet, if_link) {
811 if (ifp->if_type == IFT_ETHER
812 || ifp->if_type == IFT_L2VLAN)
813 ng_ether_attach(ifp);
814 }
815 break;
816
817 case MOD_UNLOAD:
818
819 /*
820 * Note that the base code won't try to unload us until
821 * all nodes have been removed, and that can't happen
822 * until all Ethernet interfaces are removed. In any
823 * case, we know there are no nodes left if the action
824 * is MOD_UNLOAD, so there's no need to detach any nodes.
825 */
826
827 /* Unregister function hooks */
828 ng_ether_attach_p = NULL;
829 ng_ether_detach_p = NULL;
830 ng_ether_output_p = NULL;
831 ng_ether_input_p = NULL;
832 ng_ether_input_orphan_p = NULL;
833 break;
834
835 default:
836 error = EOPNOTSUPP;
837 break;
838 }
839 splx(s);
840 return (error);
841}
842