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/11.1/sys/netgraph/ng_ether.c 298813 2016-04-29 21:25:05Z pfg $
43 */
44
45 /*
46 * ng_ether(4) netgraph node type
47 */
48
49 #include <sys/param.h>
50 #include <sys/eventhandler.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/proc.h>
57 #include <sys/syslog.h>
58 #include <sys/socket.h>
59 #include <sys/taskqueue.h>
60
61 #include <net/if.h>
62 #include <net/if_dl.h>
63 #include <net/if_types.h>
64 #include <net/if_arp.h>
65 #include <net/if_var.h>
66 #include <net/ethernet.h>
67 #include <net/if_bridgevar.h>
68 #include <net/vnet.h>
69
70 #include <netgraph/ng_message.h>
71 #include <netgraph/netgraph.h>
72 #include <netgraph/ng_parse.h>
73 #include <netgraph/ng_ether.h>
74
75 MODULE_VERSION(ng_ether, 1);
76
77 #define IFP2NG(ifp) ((ifp)->if_l2com)
78
79 /* Per-node private data */
80 struct private {
81 struct ifnet *ifp; /* associated interface */
82 hook_p upper; /* upper hook connection */
83 hook_p lower; /* lower hook connection */
84 hook_p orphan; /* orphan hook connection */
85 u_char autoSrcAddr; /* always overwrite source address */
86 u_char promisc; /* promiscuous mode enabled */
87 u_long hwassist; /* hardware checksum capabilities */
88 u_int flags; /* flags e.g. really die */
89 };
90 typedef struct private *priv_p;
91
92 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
93 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
94 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
95 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
96 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
97 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
98 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
99
100 /* Functional hooks called from if_ethersubr.c */
101 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
102 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
103 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
104 static void ng_ether_attach(struct ifnet *ifp);
105 static void ng_ether_detach(struct ifnet *ifp);
106 static void ng_ether_link_state(struct ifnet *ifp, int state);
107
108 /* Other functions */
109 static int ng_ether_rcv_lower(hook_p node, item_p item);
110 static int ng_ether_rcv_upper(hook_p node, item_p item);
111
112 /* Netgraph node methods */
113 static ng_constructor_t ng_ether_constructor;
114 static ng_rcvmsg_t ng_ether_rcvmsg;
115 static ng_shutdown_t ng_ether_shutdown;
116 static ng_newhook_t ng_ether_newhook;
117 static ng_rcvdata_t ng_ether_rcvdata;
118 static ng_disconnect_t ng_ether_disconnect;
119 static int ng_ether_mod_event(module_t mod, int event, void *data);
120
121 static eventhandler_tag ng_ether_ifnet_arrival_cookie;
122
123 /* List of commands and how to convert arguments to/from ASCII */
124 static 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_parse_enaddr_type
145 },
146 {
147 NGM_ETHER_COOKIE,
148 NGM_ETHER_SET_ENADDR,
149 "setenaddr",
150 &ng_parse_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 {
182 NGM_ETHER_COOKIE,
183 NGM_ETHER_ADD_MULTI,
184 "addmulti",
185 &ng_parse_enaddr_type,
186 NULL
187 },
188 {
189 NGM_ETHER_COOKIE,
190 NGM_ETHER_DEL_MULTI,
191 "delmulti",
192 &ng_parse_enaddr_type,
193 NULL
194 },
195 {
196 NGM_ETHER_COOKIE,
197 NGM_ETHER_DETACH,
198 "detach",
199 NULL,
200 NULL
201 },
202 { 0 }
203 };
204
205 static struct ng_type ng_ether_typestruct = {
206 .version = NG_ABI_VERSION,
207 .name = NG_ETHER_NODE_TYPE,
208 .mod_event = ng_ether_mod_event,
209 .constructor = ng_ether_constructor,
210 .rcvmsg = ng_ether_rcvmsg,
211 .shutdown = ng_ether_shutdown,
212 .newhook = ng_ether_newhook,
213 .rcvdata = ng_ether_rcvdata,
214 .disconnect = ng_ether_disconnect,
215 .cmdlist = ng_ether_cmdlist,
216 };
217 NETGRAPH_INIT(ether, &ng_ether_typestruct);
218
219 /******************************************************************
220 UTILITY FUNCTIONS
221 ******************************************************************/
222 static void
223 ng_ether_sanitize_ifname(const char *ifname, char *name)
224 {
225 int i;
226
227 for (i = 0; i < IFNAMSIZ; i++) {
228 if (ifname[i] == '.' || ifname[i] == ':')
229 name[i] = '_';
230 else
231 name[i] = ifname[i];
232 if (name[i] == '\0')
233 break;
234 }
235 }
236
237 /******************************************************************
238 ETHERNET FUNCTION HOOKS
239 ******************************************************************/
240
241 /*
242 * Handle a packet that has come in on an interface. We get to
243 * look at it here before any upper layer protocols do.
244 */
245 static void
246 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
247 {
248 const node_p node = IFP2NG(ifp);
249 const priv_p priv = NG_NODE_PRIVATE(node);
250 int error;
251
252 /* If "lower" hook not connected, let packet continue */
253 if (priv->lower == NULL)
254 return;
255 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
256 }
257
258 /*
259 * Handle a packet that has come in on an interface, and which
260 * does not match any of our known protocols (an ``orphan'').
261 */
262 static void
263 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
264 {
265 const node_p node = IFP2NG(ifp);
266 const priv_p priv = NG_NODE_PRIVATE(node);
267 int error;
268
269 /* If "orphan" hook not connected, discard packet */
270 if (priv->orphan == NULL) {
271 m_freem(m);
272 return;
273 }
274 NG_SEND_DATA_ONLY(error, priv->orphan, m);
275 }
276
277 /*
278 * Handle a packet that is going out on an interface.
279 * The Ethernet header is already attached to the mbuf.
280 */
281 static int
282 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
283 {
284 const node_p node = IFP2NG(ifp);
285 const priv_p priv = NG_NODE_PRIVATE(node);
286 int error = 0;
287
288 /* If "upper" hook not connected, let packet continue */
289 if (priv->upper == NULL)
290 return (0);
291
292 /* Send it out "upper" hook */
293 NG_OUTBOUND_THREAD_REF();
294 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
295 NG_OUTBOUND_THREAD_UNREF();
296 return (error);
297 }
298
299 /*
300 * A new Ethernet interface has been attached.
301 * Create a new node for it, etc.
302 */
303 static void
304 ng_ether_attach(struct ifnet *ifp)
305 {
306 char name[IFNAMSIZ];
307 priv_p priv;
308 node_p node;
309
310 /*
311 * Do not create / attach an ether node to this ifnet if
312 * a netgraph node with the same name already exists.
313 * This should prevent ether nodes to become attached to
314 * eiface nodes, which may be problematic due to naming
315 * clashes.
316 */
317 if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) {
318 NG_NODE_UNREF(node);
319 return;
320 }
321
322 /* Create node */
323 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
324 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
325 log(LOG_ERR, "%s: can't %s for %s\n",
326 __func__, "create node", ifp->if_xname);
327 return;
328 }
329
330 /* Allocate private data */
331 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
332 if (priv == NULL) {
333 log(LOG_ERR, "%s: can't %s for %s\n",
334 __func__, "allocate memory", ifp->if_xname);
335 NG_NODE_UNREF(node);
336 return;
337 }
338 NG_NODE_SET_PRIVATE(node, priv);
339 priv->ifp = ifp;
340 IFP2NG(ifp) = node;
341 priv->hwassist = ifp->if_hwassist;
342
343 /* Try to give the node the same name as the interface */
344 ng_ether_sanitize_ifname(ifp->if_xname, name);
345 if (ng_name_node(node, name) != 0)
346 log(LOG_WARNING, "%s: can't name node %s\n", __func__, name);
347 }
348
349 /*
350 * An Ethernet interface is being detached.
351 * REALLY Destroy its node.
352 */
353 static void
354 ng_ether_detach(struct ifnet *ifp)
355 {
356 const node_p node = IFP2NG(ifp);
357 const priv_p priv = NG_NODE_PRIVATE(node);
358
359 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
360 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
361 /*
362 * We can't assume the ifnet is still around when we run shutdown
363 * So zap it now. XXX We HOPE that anything running at this time
364 * handles it (as it should in the non netgraph case).
365 */
366 IFP2NG(ifp) = NULL;
367 priv->ifp = NULL; /* XXX race if interrupted an output packet */
368 ng_rmnode_self(node); /* remove all netgraph parts */
369 }
370
371 /*
372 * Notify graph about link event.
373 * if_link_state_change() has already checked that the state has changed.
374 */
375 static void
376 ng_ether_link_state(struct ifnet *ifp, int state)
377 {
378 const node_p node = IFP2NG(ifp);
379 const priv_p priv = NG_NODE_PRIVATE(node);
380 struct ng_mesg *msg;
381 int cmd, dummy_error = 0;
382
383 if (state == LINK_STATE_UP)
384 cmd = NGM_LINK_IS_UP;
385 else if (state == LINK_STATE_DOWN)
386 cmd = NGM_LINK_IS_DOWN;
387 else
388 return;
389
390 if (priv->lower != NULL) {
391 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
392 if (msg != NULL)
393 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
394 }
395 if (priv->orphan != NULL) {
396 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
397 if (msg != NULL)
398 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0);
399 }
400 }
401
402 /*
403 * Interface arrival notification handler.
404 * The notification is produced in two cases:
405 * o a new interface arrives
406 * o an existing interface got renamed
407 * Currently the first case is handled by ng_ether_attach via special
408 * hook ng_ether_attach_p.
409 */
410 static void
411 ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp)
412 {
413 char name[IFNAMSIZ];
414 node_p node;
415
416 /* Only ethernet interfaces are of interest. */
417 if (ifp->if_type != IFT_ETHER
418 && ifp->if_type != IFT_L2VLAN)
419 return;
420
421 /*
422 * Just return if it's a new interface without an ng_ether companion.
423 */
424 node = IFP2NG(ifp);
425 if (node == NULL)
426 return;
427
428 /* Try to give the node the same name as the new interface name */
429 ng_ether_sanitize_ifname(ifp->if_xname, name);
430 if (ng_name_node(node, name) != 0)
431 log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name);
432 }
433
434 /******************************************************************
435 NETGRAPH NODE METHODS
436 ******************************************************************/
437
438 /*
439 * It is not possible or allowable to create a node of this type.
440 * Nodes get created when the interface is attached (or, when
441 * this node type's KLD is loaded).
442 */
443 static int
444 ng_ether_constructor(node_p node)
445 {
446 return (EINVAL);
447 }
448
449 /*
450 * Check for attaching a new hook.
451 */
452 static int
453 ng_ether_newhook(node_p node, hook_p hook, const char *name)
454 {
455 const priv_p priv = NG_NODE_PRIVATE(node);
456 hook_p *hookptr;
457
458 /* Divert hook is an alias for lower */
459 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
460 name = NG_ETHER_HOOK_LOWER;
461
462 /* Which hook? */
463 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
464 hookptr = &priv->upper;
465 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
466 NG_HOOK_SET_TO_INBOUND(hook);
467 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
468 hookptr = &priv->lower;
469 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
470 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
471 hookptr = &priv->orphan;
472 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
473 } else
474 return (EINVAL);
475
476 /* Check if already connected (shouldn't be, but doesn't hurt) */
477 if (*hookptr != NULL)
478 return (EISCONN);
479
480 /* Disable hardware checksums while 'upper' hook is connected */
481 if (hookptr == &priv->upper)
482 priv->ifp->if_hwassist = 0;
483 NG_HOOK_HI_STACK(hook);
484 /* OK */
485 *hookptr = hook;
486 return (0);
487 }
488
489 /*
490 * Receive an incoming control message.
491 */
492 static int
493 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
494 {
495 const priv_p priv = NG_NODE_PRIVATE(node);
496 struct ng_mesg *resp = NULL;
497 int error = 0;
498 struct ng_mesg *msg;
499
500 NGI_GET_MSG(item, msg);
501 switch (msg->header.typecookie) {
502 case NGM_ETHER_COOKIE:
503 switch (msg->header.cmd) {
504 case NGM_ETHER_GET_IFNAME:
505 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
506 if (resp == NULL) {
507 error = ENOMEM;
508 break;
509 }
510 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
511 break;
512 case NGM_ETHER_GET_IFINDEX:
513 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
514 if (resp == NULL) {
515 error = ENOMEM;
516 break;
517 }
518 *((u_int32_t *)resp->data) = priv->ifp->if_index;
519 break;
520 case NGM_ETHER_GET_ENADDR:
521 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
522 if (resp == NULL) {
523 error = ENOMEM;
524 break;
525 }
526 bcopy(IF_LLADDR(priv->ifp),
527 resp->data, ETHER_ADDR_LEN);
528 break;
529 case NGM_ETHER_SET_ENADDR:
530 {
531 if (msg->header.arglen != ETHER_ADDR_LEN) {
532 error = EINVAL;
533 break;
534 }
535 error = if_setlladdr(priv->ifp,
536 (u_char *)msg->data, ETHER_ADDR_LEN);
537 break;
538 }
539 case NGM_ETHER_GET_PROMISC:
540 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
541 if (resp == NULL) {
542 error = ENOMEM;
543 break;
544 }
545 *((u_int32_t *)resp->data) = priv->promisc;
546 break;
547 case NGM_ETHER_SET_PROMISC:
548 {
549 u_char want;
550
551 if (msg->header.arglen != sizeof(u_int32_t)) {
552 error = EINVAL;
553 break;
554 }
555 want = !!*((u_int32_t *)msg->data);
556 if (want ^ priv->promisc) {
557 if ((error = ifpromisc(priv->ifp, want)) != 0)
558 break;
559 priv->promisc = want;
560 }
561 break;
562 }
563 case NGM_ETHER_GET_AUTOSRC:
564 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
565 if (resp == NULL) {
566 error = ENOMEM;
567 break;
568 }
569 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
570 break;
571 case NGM_ETHER_SET_AUTOSRC:
572 if (msg->header.arglen != sizeof(u_int32_t)) {
573 error = EINVAL;
574 break;
575 }
576 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
577 break;
578 case NGM_ETHER_ADD_MULTI:
579 {
580 struct sockaddr_dl sa_dl;
581 struct ifmultiaddr *ifma;
582
583 if (msg->header.arglen != ETHER_ADDR_LEN) {
584 error = EINVAL;
585 break;
586 }
587 bzero(&sa_dl, sizeof(struct sockaddr_dl));
588 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
589 sa_dl.sdl_family = AF_LINK;
590 sa_dl.sdl_alen = ETHER_ADDR_LEN;
591 bcopy((void *)msg->data, LLADDR(&sa_dl),
592 ETHER_ADDR_LEN);
593 /*
594 * Netgraph is only permitted to join groups once
595 * via the if_addmulti() KPI, because it cannot hold
596 * struct ifmultiaddr * between calls. It may also
597 * lose a race while we check if the membership
598 * already exists.
599 */
600 if_maddr_rlock(priv->ifp);
601 ifma = if_findmulti(priv->ifp,
602 (struct sockaddr *)&sa_dl);
603 if_maddr_runlock(priv->ifp);
604 if (ifma != NULL) {
605 error = EADDRINUSE;
606 } else {
607 error = if_addmulti(priv->ifp,
608 (struct sockaddr *)&sa_dl, &ifma);
609 }
610 break;
611 }
612 case NGM_ETHER_DEL_MULTI:
613 {
614 struct sockaddr_dl sa_dl;
615
616 if (msg->header.arglen != ETHER_ADDR_LEN) {
617 error = EINVAL;
618 break;
619 }
620 bzero(&sa_dl, sizeof(struct sockaddr_dl));
621 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
622 sa_dl.sdl_family = AF_LINK;
623 sa_dl.sdl_alen = ETHER_ADDR_LEN;
624 bcopy((void *)msg->data, LLADDR(&sa_dl),
625 ETHER_ADDR_LEN);
626 error = if_delmulti(priv->ifp,
627 (struct sockaddr *)&sa_dl);
628 break;
629 }
630 case NGM_ETHER_DETACH:
631 ng_ether_detach(priv->ifp);
632 break;
633 default:
634 error = EINVAL;
635 break;
636 }
637 break;
638 default:
639 error = EINVAL;
640 break;
641 }
642 NG_RESPOND_MSG(error, node, item, resp);
643 NG_FREE_MSG(msg);
644 return (error);
645 }
646
647 /*
648 * Receive data on a hook.
649 * Since we use per-hook recveive methods this should never be called.
650 */
651 static int
652 ng_ether_rcvdata(hook_p hook, item_p item)
653 {
654 NG_FREE_ITEM(item);
655
656 panic("%s: weird hook", __func__);
657 }
658
659 /*
660 * Handle an mbuf received on the "lower" or "orphan" hook.
661 */
662 static int
663 ng_ether_rcv_lower(hook_p hook, item_p item)
664 {
665 struct mbuf *m;
666 const node_p node = NG_HOOK_NODE(hook);
667 const priv_p priv = NG_NODE_PRIVATE(node);
668 struct ifnet *const ifp = priv->ifp;
669
670 NGI_GET_M(item, m);
671 NG_FREE_ITEM(item);
672
673 /* Check whether interface is ready for packets */
674
675 if (!((ifp->if_flags & IFF_UP) &&
676 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
677 NG_FREE_M(m);
678 return (ENETDOWN);
679 }
680
681 /* Make sure header is fully pulled up */
682 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
683 NG_FREE_M(m);
684 return (EINVAL);
685 }
686 if (m->m_len < sizeof(struct ether_header)
687 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
688 return (ENOBUFS);
689
690 /* Drop in the MAC address if desired */
691 if (priv->autoSrcAddr) {
692
693 /* Make the mbuf writable if it's not already */
694 if (!M_WRITABLE(m)
695 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
696 return (ENOBUFS);
697
698 /* Overwrite source MAC address */
699 bcopy(IF_LLADDR(ifp),
700 mtod(m, struct ether_header *)->ether_shost,
701 ETHER_ADDR_LEN);
702 }
703
704 /* Send it on its way */
705 return ether_output_frame(ifp, m);
706 }
707
708 /*
709 * Handle an mbuf received on the "upper" hook.
710 */
711 static int
712 ng_ether_rcv_upper(hook_p hook, item_p item)
713 {
714 struct mbuf *m;
715 const node_p node = NG_HOOK_NODE(hook);
716 const priv_p priv = NG_NODE_PRIVATE(node);
717 struct ifnet *ifp = priv->ifp;
718
719 NGI_GET_M(item, m);
720 NG_FREE_ITEM(item);
721
722 /* Check length and pull off header */
723 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
724 NG_FREE_M(m);
725 return (EINVAL);
726 }
727 if (m->m_len < sizeof(struct ether_header) &&
728 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
729 return (ENOBUFS);
730
731 m->m_pkthdr.rcvif = ifp;
732
733 /* Pass the packet to the bridge, it may come back to us */
734 if (ifp->if_bridge) {
735 BRIDGE_INPUT(ifp, m);
736 if (m == NULL)
737 return (0);
738 }
739
740 /* Route packet back in */
741 ether_demux(ifp, m);
742 return (0);
743 }
744
745 /*
746 * Shutdown node. This resets the node but does not remove it
747 * unless the REALLY_DIE flag is set.
748 */
749 static int
750 ng_ether_shutdown(node_p node)
751 {
752 const priv_p priv = NG_NODE_PRIVATE(node);
753
754 if (node->nd_flags & NGF_REALLY_DIE) {
755 /*
756 * WE came here because the ethernet card is being unloaded,
757 * so stop being persistent.
758 * Actually undo all the things we did on creation.
759 * Assume the ifp has already been freed.
760 */
761 NG_NODE_SET_PRIVATE(node, NULL);
762 free(priv, M_NETGRAPH);
763 NG_NODE_UNREF(node); /* free node itself */
764 return (0);
765 }
766 if (priv->promisc) { /* disable promiscuous mode */
767 (void)ifpromisc(priv->ifp, 0);
768 priv->promisc = 0;
769 }
770 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
771
772 return (0);
773 }
774
775 /*
776 * Hook disconnection.
777 */
778 static int
779 ng_ether_disconnect(hook_p hook)
780 {
781 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
782
783 if (hook == priv->upper) {
784 priv->upper = NULL;
785 if (priv->ifp != NULL) /* restore h/w csum */
786 priv->ifp->if_hwassist = priv->hwassist;
787 } else if (hook == priv->lower)
788 priv->lower = NULL;
789 else if (hook == priv->orphan)
790 priv->orphan = NULL;
791 else
792 panic("%s: weird hook", __func__);
793 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
794 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
795 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
796 return (0);
797 }
798
799 /******************************************************************
800 INITIALIZATION
801 ******************************************************************/
802
803 /*
804 * Handle loading and unloading for this node type.
805 */
806 static int
807 ng_ether_mod_event(module_t mod, int event, void *data)
808 {
809 int error = 0;
810
811 switch (event) {
812 case MOD_LOAD:
813
814 /* Register function hooks */
815 if (ng_ether_attach_p != NULL) {
816 error = EEXIST;
817 break;
818 }
819 ng_ether_attach_p = ng_ether_attach;
820 ng_ether_detach_p = ng_ether_detach;
821 ng_ether_output_p = ng_ether_output;
822 ng_ether_input_p = ng_ether_input;
823 ng_ether_input_orphan_p = ng_ether_input_orphan;
824 ng_ether_link_state_p = ng_ether_link_state;
825
826 ng_ether_ifnet_arrival_cookie =
827 EVENTHANDLER_REGISTER(ifnet_arrival_event,
828 ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY);
829 break;
830
831 case MOD_UNLOAD:
832
833 /*
834 * Note that the base code won't try to unload us until
835 * all nodes have been removed, and that can't happen
836 * until all Ethernet interfaces are removed. In any
837 * case, we know there are no nodes left if the action
838 * is MOD_UNLOAD, so there's no need to detach any nodes.
839 */
840
841 EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
842 ng_ether_ifnet_arrival_cookie);
843
844 /* Unregister function hooks */
845 ng_ether_attach_p = NULL;
846 ng_ether_detach_p = NULL;
847 ng_ether_output_p = NULL;
848 ng_ether_input_p = NULL;
849 ng_ether_input_orphan_p = NULL;
850 ng_ether_link_state_p = NULL;
851 break;
852
853 default:
854 error = EOPNOTSUPP;
855 break;
856 }
857 return (error);
858 }
859
860 static void
861 vnet_ng_ether_init(const void *unused)
862 {
863 struct ifnet *ifp;
864
865 /* If module load was rejected, don't attach to vnets. */
866 if (ng_ether_attach_p != ng_ether_attach)
867 return;
868
869 /* Create nodes for any already-existing Ethernet interfaces. */
870 IFNET_RLOCK();
871 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
872 if (ifp->if_type == IFT_ETHER
873 || ifp->if_type == IFT_L2VLAN)
874 ng_ether_attach(ifp);
875 }
876 IFNET_RUNLOCK();
877 }
878 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
879 vnet_ng_ether_init, NULL);
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