kernel/netgraph7: Replace usage of MALLOC/FREE with kmalloc/kfree here too.
[dragonfly.git] / sys / netgraph7 / ng_ether.c
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1
2/*
3 * ng_ether.c
4 */
5
6/*-
7 * Copyright (c) 1996-2000 Whistle Communications, Inc.
8 * All rights reserved.
9 *
10 * Subject to the following obligations and disclaimer of warranty, use and
11 * redistribution of this software, in source or object code forms, with or
12 * without modifications are expressly permitted by Whistle Communications;
13 * provided, however, that:
14 * 1. Any and all reproductions of the source or object code must include the
15 * copyright notice above and the following disclaimer of warranties; and
16 * 2. No rights are granted, in any manner or form, to use Whistle
17 * Communications, Inc. trademarks, including the mark "WHISTLE
18 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
19 * such appears in the above copyright notice or in the software.
20 *
21 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
22 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
23 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
24 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
26 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
27 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
28 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
29 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
30 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
31 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
32 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
33 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
36 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
37 * OF SUCH DAMAGE.
38 *
39 * Authors: Archie Cobbs <archie@freebsd.org>
40 * Julian Elischer <julian@freebsd.org>
41 *
42 * $FreeBSD: src/sys/netgraph/ng_ether.c,v 1.62 2007/03/20 00:36:10 bms Exp $
5a975a3d 43 * $DragonFly: src/sys/netgraph7/ng_ether.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
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44 */
45
46/*
47 * ng_ether(4) netgraph node type
48 */
49
50#include <sys/param.h>
51#include <sys/systm.h>
52#include <sys/kernel.h>
53#include <sys/malloc.h>
54#include <sys/mbuf.h>
55#include <sys/errno.h>
56#include <sys/syslog.h>
57#include <sys/socket.h>
58
59#include <net/if.h>
60#include <net/if_dl.h>
61#include <net/if_types.h>
62#include <net/if_arp.h>
63#include <net/if_var.h>
64#include <net/ethernet.h>
65#include <net/if_bridgevar.h>
66
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67#include "ng_message.h"
68#include "netgraph.h"
69#include "ng_parse.h"
70#include "ng_ether.h"
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71
72#define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph)
73
74/* Per-node private data */
75struct private {
76 struct ifnet *ifp; /* associated interface */
77 hook_p upper; /* upper hook connection */
78 hook_p lower; /* lower hook connection */
79 hook_p orphan; /* orphan hook connection */
80 u_char autoSrcAddr; /* always overwrite source address */
81 u_char promisc; /* promiscuous mode enabled */
82 u_long hwassist; /* hardware checksum capabilities */
83 u_int flags; /* flags e.g. really die */
84};
85typedef struct private *priv_p;
86
87/* Hook pointers used by if_ethersubr.c to callback to netgraph */
88extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
89extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
90extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
91extern void (*ng_ether_attach_p)(struct ifnet *ifp);
92extern void (*ng_ether_detach_p)(struct ifnet *ifp);
93extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
94
95/* Functional hooks called from if_ethersubr.c */
96static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
97static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
98static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
99static void ng_ether_attach(struct ifnet *ifp);
100static void ng_ether_detach(struct ifnet *ifp);
101static void ng_ether_link_state(struct ifnet *ifp, int state);
102
103/* Other functions */
104static int ng_ether_rcv_lower(node_p node, struct mbuf *m);
105static int ng_ether_rcv_upper(node_p node, struct mbuf *m);
106
107/* Netgraph node methods */
108static ng_constructor_t ng_ether_constructor;
109static ng_rcvmsg_t ng_ether_rcvmsg;
110static ng_shutdown_t ng_ether_shutdown;
111static ng_newhook_t ng_ether_newhook;
112static ng_rcvdata_t ng_ether_rcvdata;
113static ng_disconnect_t ng_ether_disconnect;
114static int ng_ether_mod_event(module_t mod, int event, void *data);
115
116/* List of commands and how to convert arguments to/from ASCII */
117static const struct ng_cmdlist ng_ether_cmdlist[] = {
118 {
119 NGM_ETHER_COOKIE,
120 NGM_ETHER_GET_IFNAME,
121 "getifname",
122 NULL,
123 &ng_parse_string_type
124 },
125 {
126 NGM_ETHER_COOKIE,
127 NGM_ETHER_GET_IFINDEX,
128 "getifindex",
129 NULL,
130 &ng_parse_int32_type
131 },
132 {
133 NGM_ETHER_COOKIE,
134 NGM_ETHER_GET_ENADDR,
135 "getenaddr",
136 NULL,
137 &ng_parse_enaddr_type
138 },
139 {
140 NGM_ETHER_COOKIE,
141 NGM_ETHER_SET_ENADDR,
142 "setenaddr",
143 &ng_parse_enaddr_type,
144 NULL
145 },
146 {
147 NGM_ETHER_COOKIE,
148 NGM_ETHER_GET_PROMISC,
149 "getpromisc",
150 NULL,
151 &ng_parse_int32_type
152 },
153 {
154 NGM_ETHER_COOKIE,
155 NGM_ETHER_SET_PROMISC,
156 "setpromisc",
157 &ng_parse_int32_type,
158 NULL
159 },
160 {
161 NGM_ETHER_COOKIE,
162 NGM_ETHER_GET_AUTOSRC,
163 "getautosrc",
164 NULL,
165 &ng_parse_int32_type
166 },
167 {
168 NGM_ETHER_COOKIE,
169 NGM_ETHER_SET_AUTOSRC,
170 "setautosrc",
171 &ng_parse_int32_type,
172 NULL
173 },
174 {
175 NGM_ETHER_COOKIE,
176 NGM_ETHER_ADD_MULTI,
177 "addmulti",
178 &ng_parse_enaddr_type,
179 NULL
180 },
181 {
182 NGM_ETHER_COOKIE,
183 NGM_ETHER_DEL_MULTI,
184 "delmulti",
185 &ng_parse_enaddr_type,
186 NULL
187 },
188 {
189 NGM_ETHER_COOKIE,
190 NGM_ETHER_DETACH,
191 "detach",
192 NULL,
193 NULL
194 },
195 { 0 }
196};
197
198static struct ng_type ng_ether_typestruct = {
199 .version = NG_ABI_VERSION,
200 .name = NG_ETHER_NODE_TYPE,
201 .mod_event = ng_ether_mod_event,
202 .constructor = ng_ether_constructor,
203 .rcvmsg = ng_ether_rcvmsg,
204 .shutdown = ng_ether_shutdown,
205 .newhook = ng_ether_newhook,
206 .rcvdata = ng_ether_rcvdata,
207 .disconnect = ng_ether_disconnect,
208 .cmdlist = ng_ether_cmdlist,
209};
210NETGRAPH_INIT(ether, &ng_ether_typestruct);
211
212/******************************************************************
213 ETHERNET FUNCTION HOOKS
214******************************************************************/
215
216/*
217 * Handle a packet that has come in on an interface. We get to
218 * look at it here before any upper layer protocols do.
219 *
220 * NOTE: this function will get called at splimp()
221 */
222static void
223ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
224{
225 const node_p node = IFP2NG(ifp);
226 const priv_p priv = NG_NODE_PRIVATE(node);
227 int error;
228
229 /* If "lower" hook not connected, let packet continue */
230 if (priv->lower == NULL)
231 return;
232 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
233}
234
235/*
236 * Handle a packet that has come in on an interface, and which
237 * does not match any of our known protocols (an ``orphan'').
238 *
239 * NOTE: this function will get called at splimp()
240 */
241static void
242ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
243{
244 const node_p node = IFP2NG(ifp);
245 const priv_p priv = NG_NODE_PRIVATE(node);
246 int error;
247
248 /* If "orphan" hook not connected, discard packet */
249 if (priv->orphan == NULL) {
250 m_freem(m);
251 return;
252 }
253 NG_SEND_DATA_ONLY(error, priv->orphan, m);
254}
255
256/*
257 * Handle a packet that is going out on an interface.
258 * The Ethernet header is already attached to the mbuf.
259 */
260static int
261ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
262{
263 const node_p node = IFP2NG(ifp);
264 const priv_p priv = NG_NODE_PRIVATE(node);
265 int error = 0;
266
267 /* If "upper" hook not connected, let packet continue */
268 if (priv->upper == NULL)
269 return (0);
270
271 /* Send it out "upper" hook */
272 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
273 return (error);
274}
275
276/*
277 * A new Ethernet interface has been attached.
278 * Create a new node for it, etc.
279 */
280static void
281ng_ether_attach(struct ifnet *ifp)
282{
283 priv_p priv;
284 node_p node;
285
286 /* Create node */
287 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
288 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
289 log(LOG_ERR, "%s: can't %s for %s\n",
290 __func__, "create node", ifp->if_xname);
291 return;
292 }
293
294 /* Allocate private data */
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295 priv = kmalloc(sizeof(*priv), M_NETGRAPH,
296 M_WAITOK | M_NULLOK | M_ZERO);
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297 if (priv == NULL) {
298 log(LOG_ERR, "%s: can't %s for %s\n",
299 __func__, "allocate memory", ifp->if_xname);
300 NG_NODE_UNREF(node);
301 return;
302 }
303 NG_NODE_SET_PRIVATE(node, priv);
304 priv->ifp = ifp;
305 IFP2NG(ifp) = node;
306 priv->hwassist = ifp->if_hwassist;
307
308 /* Try to give the node the same name as the interface */
309 if (ng_name_node(node, ifp->if_xname) != 0) {
310 log(LOG_WARNING, "%s: can't name node %s\n",
311 __func__, ifp->if_xname);
312 }
313}
314
315/*
316 * An Ethernet interface is being detached.
317 * REALLY Destroy its node.
318 */
319static void
320ng_ether_detach(struct ifnet *ifp)
321{
322 const node_p node = IFP2NG(ifp);
323 const priv_p priv = NG_NODE_PRIVATE(node);
324
325 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
326 /*
327 * We can't assume the ifnet is still around when we run shutdown
328 * So zap it now. XXX We HOPE that anything running at this time
329 * handles it (as it should in the non netgraph case).
330 */
331 IFP2NG(ifp) = NULL;
332 priv->ifp = NULL; /* XXX race if interrupted an output packet */
333 ng_rmnode_self(node); /* remove all netgraph parts */
334}
335
336/*
337 * Notify graph about link event.
338 * if_link_state_change() has already checked that the state has changed.
339 */
340static void
341ng_ether_link_state(struct ifnet *ifp, int state)
342{
343 const node_p node = IFP2NG(ifp);
344 const priv_p priv = NG_NODE_PRIVATE(node);
345 struct ng_mesg *msg;
346 int cmd, dummy_error = 0;
347
348 if (priv->lower == NULL)
349 return;
350
351 if (state == LINK_STATE_UP)
352 cmd = NGM_LINK_IS_UP;
353 else if (state == LINK_STATE_DOWN)
354 cmd = NGM_LINK_IS_DOWN;
355 else
356 return;
357
5a975a3d 358 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_WAITOK | M_NULLOK);
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359 if (msg != NULL)
360 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
361}
362
363/******************************************************************
364 NETGRAPH NODE METHODS
365******************************************************************/
366
367/*
368 * It is not possible or allowable to create a node of this type.
369 * Nodes get created when the interface is attached (or, when
370 * this node type's KLD is loaded).
371 */
372static int
373ng_ether_constructor(node_p node)
374{
375 return (EINVAL);
376}
377
378/*
379 * Check for attaching a new hook.
380 */
381static int
382ng_ether_newhook(node_p node, hook_p hook, const char *name)
383{
384 const priv_p priv = NG_NODE_PRIVATE(node);
385 hook_p *hookptr;
386
387 /* Divert hook is an alias for lower */
388 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
389 name = NG_ETHER_HOOK_LOWER;
390
391 /* Which hook? */
392 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
393 hookptr = &priv->upper;
394 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0)
395 hookptr = &priv->lower;
396 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0)
397 hookptr = &priv->orphan;
398 else
399 return (EINVAL);
400
401 /* Check if already connected (shouldn't be, but doesn't hurt) */
402 if (*hookptr != NULL)
403 return (EISCONN);
404
405 /* Disable hardware checksums while 'upper' hook is connected */
406 if (hookptr == &priv->upper)
407 priv->ifp->if_hwassist = 0;
408
409 /* OK */
410 *hookptr = hook;
411 return (0);
412}
413
414/*
415 * Receive an incoming control message.
416 */
417static int
418ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
419{
420 const priv_p priv = NG_NODE_PRIVATE(node);
421 struct ng_mesg *resp = NULL;
422 int error = 0;
423 struct ng_mesg *msg;
424
425 NGI_GET_MSG(item, msg);
426 switch (msg->header.typecookie) {
427 case NGM_ETHER_COOKIE:
428 switch (msg->header.cmd) {
429 case NGM_ETHER_GET_IFNAME:
5a975a3d 430 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
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431 if (resp == NULL) {
432 error = ENOMEM;
433 break;
434 }
435 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
436 break;
437 case NGM_ETHER_GET_IFINDEX:
5a975a3d 438 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK);
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439 if (resp == NULL) {
440 error = ENOMEM;
441 break;
442 }
443 *((u_int32_t *)resp->data) = priv->ifp->if_index;
444 break;
445 case NGM_ETHER_GET_ENADDR:
5a975a3d 446 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_WAITOK | M_NULLOK);
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447 if (resp == NULL) {
448 error = ENOMEM;
449 break;
450 }
451 bcopy(IF_LLADDR(priv->ifp),
452 resp->data, ETHER_ADDR_LEN);
453 break;
454 case NGM_ETHER_SET_ENADDR:
455 {
456 if (msg->header.arglen != ETHER_ADDR_LEN) {
457 error = EINVAL;
458 break;
459 }
460 error = if_setlladdr(priv->ifp,
461 (u_char *)msg->data, ETHER_ADDR_LEN);
462 break;
463 }
464 case NGM_ETHER_GET_PROMISC:
5a975a3d 465 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK);
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466 if (resp == NULL) {
467 error = ENOMEM;
468 break;
469 }
470 *((u_int32_t *)resp->data) = priv->promisc;
471 break;
472 case NGM_ETHER_SET_PROMISC:
473 {
474 u_char want;
475
476 if (msg->header.arglen != sizeof(u_int32_t)) {
477 error = EINVAL;
478 break;
479 }
480 want = !!*((u_int32_t *)msg->data);
481 if (want ^ priv->promisc) {
482 if ((error = ifpromisc(priv->ifp, want)) != 0)
483 break;
484 priv->promisc = want;
485 }
486 break;
487 }
488 case NGM_ETHER_GET_AUTOSRC:
5a975a3d 489 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_WAITOK | M_NULLOK);
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490 if (resp == NULL) {
491 error = ENOMEM;
492 break;
493 }
494 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
495 break;
496 case NGM_ETHER_SET_AUTOSRC:
497 if (msg->header.arglen != sizeof(u_int32_t)) {
498 error = EINVAL;
499 break;
500 }
501 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
502 break;
503 case NGM_ETHER_ADD_MULTI:
504 {
505 struct sockaddr_dl sa_dl;
506 struct ifmultiaddr *ifma;
507
508 if (msg->header.arglen != ETHER_ADDR_LEN) {
509 error = EINVAL;
510 break;
511 }
512 bzero(&sa_dl, sizeof(struct sockaddr_dl));
513 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
514 sa_dl.sdl_family = AF_LINK;
515 sa_dl.sdl_alen = ETHER_ADDR_LEN;
516 bcopy((void *)msg->data, LLADDR(&sa_dl),
517 ETHER_ADDR_LEN);
518 /*
519 * Netgraph is only permitted to join groups once
520 * via the if_addmulti() KPI, because it cannot hold
521 * struct ifmultiaddr * between calls. It may also
522 * lose a race while we check if the membership
523 * already exists.
524 */
525 IF_ADDR_LOCK(priv->ifp);
526 ifma = if_findmulti(priv->ifp,
527 (struct sockaddr *)&sa_dl);
528 IF_ADDR_UNLOCK(priv->ifp);
529 if (ifma != NULL) {
530 error = EADDRINUSE;
531 } else {
532 error = if_addmulti(priv->ifp,
533 (struct sockaddr *)&sa_dl, &ifma);
534 }
535 break;
536 }
537 case NGM_ETHER_DEL_MULTI:
538 {
539 struct sockaddr_dl sa_dl;
540
541 if (msg->header.arglen != ETHER_ADDR_LEN) {
542 error = EINVAL;
543 break;
544 }
545 bzero(&sa_dl, sizeof(struct sockaddr_dl));
546 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
547 sa_dl.sdl_family = AF_LINK;
548 sa_dl.sdl_alen = ETHER_ADDR_LEN;
549 bcopy((void *)msg->data, LLADDR(&sa_dl),
550 ETHER_ADDR_LEN);
551 error = if_delmulti(priv->ifp,
552 (struct sockaddr *)&sa_dl);
553 break;
554 }
555 case NGM_ETHER_DETACH:
556 ng_ether_detach(priv->ifp);
557 break;
558 default:
559 error = EINVAL;
560 break;
561 }
562 break;
563 default:
564 error = EINVAL;
565 break;
566 }
567 NG_RESPOND_MSG(error, node, item, resp);
568 NG_FREE_MSG(msg);
569 return (error);
570}
571
572/*
573 * Receive data on a hook.
574 */
575static int
576ng_ether_rcvdata(hook_p hook, item_p item)
577{
578 const node_p node = NG_HOOK_NODE(hook);
579 const priv_p priv = NG_NODE_PRIVATE(node);
580 struct mbuf *m;
581
582 NGI_GET_M(item, m);
583 NG_FREE_ITEM(item);
584
585 if (hook == priv->lower || hook == priv->orphan)
586 return ng_ether_rcv_lower(node, m);
587 if (hook == priv->upper)
588 return ng_ether_rcv_upper(node, m);
589 panic("%s: weird hook", __func__);
590#ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */
591 return (0);
592#endif
593}
594
595/*
596 * Handle an mbuf received on the "lower" or "orphan" hook.
597 */
598static int
599ng_ether_rcv_lower(node_p node, struct mbuf *m)
600{
601 const priv_p priv = NG_NODE_PRIVATE(node);
602 struct ifnet *const ifp = priv->ifp;
603
604 /* Check whether interface is ready for packets */
605 if (!((ifp->if_flags & IFF_UP) &&
606 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
607 NG_FREE_M(m);
608 return (ENETDOWN);
609 }
610
611 /* Make sure header is fully pulled up */
612 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
613 NG_FREE_M(m);
614 return (EINVAL);
615 }
616 if (m->m_len < sizeof(struct ether_header)
617 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
618 return (ENOBUFS);
619
620 /* Drop in the MAC address if desired */
621 if (priv->autoSrcAddr) {
622
623 /* Make the mbuf writable if it's not already */
624 if (!M_WRITABLE(m)
625 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
626 return (ENOBUFS);
627
628 /* Overwrite source MAC address */
629 bcopy(IF_LLADDR(ifp),
630 mtod(m, struct ether_header *)->ether_shost,
631 ETHER_ADDR_LEN);
632 }
633
634 /* Send it on its way */
635 return ether_output_frame(ifp, m);
636}
637
638/*
639 * Handle an mbuf received on the "upper" hook.
640 */
641static int
642ng_ether_rcv_upper(node_p node, struct mbuf *m)
643{
644 const priv_p priv = NG_NODE_PRIVATE(node);
645 struct ifnet *ifp = priv->ifp;
646
647 /* Check length and pull off header */
648 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
649 NG_FREE_M(m);
650 return (EINVAL);
651 }
652 if (m->m_len < sizeof(struct ether_header) &&
653 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
654 return (ENOBUFS);
655
656 m->m_pkthdr.rcvif = ifp;
657
658 /* Pass the packet to the bridge, it may come back to us */
659 if (ifp->if_bridge) {
660 BRIDGE_INPUT(ifp, m);
661 if (m == NULL)
662 return (0);
663 }
664
665 /* Route packet back in */
666 ether_demux(ifp, m);
667 return (0);
668}
669
670/*
671 * Shutdown node. This resets the node but does not remove it
672 * unless the REALLY_DIE flag is set.
673 */
674static int
675ng_ether_shutdown(node_p node)
676{
677 const priv_p priv = NG_NODE_PRIVATE(node);
678
679 if (node->nd_flags & NGF_REALLY_DIE) {
680 /*
681 * WE came here because the ethernet card is being unloaded,
682 * so stop being persistant.
683 * Actually undo all the things we did on creation.
684 * Assume the ifp has already been freed.
685 */
686 NG_NODE_SET_PRIVATE(node, NULL);
fc025606 687 kfree(priv, M_NETGRAPH);
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688 NG_NODE_UNREF(node); /* free node itself */
689 return (0);
690 }
691 if (priv->promisc) { /* disable promiscuous mode */
692 (void)ifpromisc(priv->ifp, 0);
693 priv->promisc = 0;
694 }
695 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
696 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
697
698 return (0);
699}
700
701/*
702 * Hook disconnection.
703 */
704static int
705ng_ether_disconnect(hook_p hook)
706{
707 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
708
709 if (hook == priv->upper) {
710 priv->upper = NULL;
711 if (priv->ifp != NULL) /* restore h/w csum */
712 priv->ifp->if_hwassist = priv->hwassist;
713 } else if (hook == priv->lower)
714 priv->lower = NULL;
715 else if (hook == priv->orphan)
716 priv->orphan = NULL;
717 else
718 panic("%s: weird hook", __func__);
719 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
720 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
721 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
722 return (0);
723}
724
725/******************************************************************
726 INITIALIZATION
727******************************************************************/
728
729/*
730 * Handle loading and unloading for this node type.
731 */
732static int
733ng_ether_mod_event(module_t mod, int event, void *data)
734{
735 struct ifnet *ifp;
736 int error = 0;
737 int s;
738
739 s = splnet();
740 switch (event) {
741 case MOD_LOAD:
742
743 /* Register function hooks */
744 if (ng_ether_attach_p != NULL) {
745 error = EEXIST;
746 break;
747 }
748 ng_ether_attach_p = ng_ether_attach;
749 ng_ether_detach_p = ng_ether_detach;
750 ng_ether_output_p = ng_ether_output;
751 ng_ether_input_p = ng_ether_input;
752 ng_ether_input_orphan_p = ng_ether_input_orphan;
753 ng_ether_link_state_p = ng_ether_link_state;
754
755 /* Create nodes for any already-existing Ethernet interfaces */
756 IFNET_RLOCK();
757 TAILQ_FOREACH(ifp, &ifnet, if_link) {
758 if (ifp->if_type == IFT_ETHER
759 || ifp->if_type == IFT_L2VLAN)
760 ng_ether_attach(ifp);
761 }
762 IFNET_RUNLOCK();
763 break;
764
765 case MOD_UNLOAD:
766
767 /*
768 * Note that the base code won't try to unload us until
769 * all nodes have been removed, and that can't happen
770 * until all Ethernet interfaces are removed. In any
771 * case, we know there are no nodes left if the action
772 * is MOD_UNLOAD, so there's no need to detach any nodes.
773 */
774
775 /* Unregister function hooks */
776 ng_ether_attach_p = NULL;
777 ng_ether_detach_p = NULL;
778 ng_ether_output_p = NULL;
779 ng_ether_input_p = NULL;
780 ng_ether_input_orphan_p = NULL;
781 ng_ether_link_state_p = NULL;
782 break;
783
784 default:
785 error = EOPNOTSUPP;
786 break;
787 }
788 splx(s);
789 return (error);
790}
791