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: stable/9/sys/netgraph/ng_ether.c 247886 2013-03-06 11:02:44Z avg $
43 */
44
45 /*
46 * ng_ether(4) netgraph node type
47 */
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
52 #include <sys/malloc.h>
53 #include <sys/mbuf.h>
54 #include <sys/errno.h>
55 #include <sys/proc.h>
56 #include <sys/syslog.h>
57 #include <sys/socket.h>
58 #include <sys/taskqueue.h>
59
60 #include <net/if.h>
61 #include <net/if_dl.h>
62 #include <net/if_types.h>
63 #include <net/if_arp.h>
64 #include <net/if_var.h>
65 #include <net/ethernet.h>
66 #include <net/if_bridgevar.h>
67 #include <net/vnet.h>
68
69 #include <netgraph/ng_message.h>
70 #include <netgraph/netgraph.h>
71 #include <netgraph/ng_parse.h>
72 #include <netgraph/ng_ether.h>
73
74 MODULE_VERSION(ng_ether, 1);
75
76 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph)
77
78 /* Per-node private data */
79 struct private {
80 struct ifnet *ifp; /* associated interface */
81 hook_p upper; /* upper hook connection */
82 hook_p lower; /* lower hook connection */
83 hook_p orphan; /* orphan hook connection */
84 u_char autoSrcAddr; /* always overwrite source address */
85 u_char promisc; /* promiscuous mode enabled */
86 u_long hwassist; /* hardware checksum capabilities */
87 u_int flags; /* flags e.g. really die */
88 };
89 typedef struct private *priv_p;
90
91 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
92 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
93 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
94 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
95 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
96 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
97 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
98
99 /* Functional hooks called from if_ethersubr.c */
100 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
101 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
102 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
103 static void ng_ether_attach(struct ifnet *ifp);
104 static void ng_ether_detach(struct ifnet *ifp);
105 static void ng_ether_link_state(struct ifnet *ifp, int state);
106
107 /* Other functions */
108 static int ng_ether_rcv_lower(hook_p node, item_p item);
109 static int ng_ether_rcv_upper(hook_p node, item_p item);
110
111 /* Netgraph node methods */
112 static ng_constructor_t ng_ether_constructor;
113 static ng_rcvmsg_t ng_ether_rcvmsg;
114 static ng_shutdown_t ng_ether_shutdown;
115 static ng_newhook_t ng_ether_newhook;
116 static ng_rcvdata_t ng_ether_rcvdata;
117 static ng_disconnect_t ng_ether_disconnect;
118 static int ng_ether_mod_event(module_t mod, int event, void *data);
119
120 static eventhandler_tag ng_ether_ifnet_arrival_cookie;
121
122 /* List of commands and how to convert arguments to/from ASCII */
123 static const struct ng_cmdlist ng_ether_cmdlist[] = {
124 {
125 NGM_ETHER_COOKIE,
126 NGM_ETHER_GET_IFNAME,
127 "getifname",
128 NULL,
129 &ng_parse_string_type
130 },
131 {
132 NGM_ETHER_COOKIE,
133 NGM_ETHER_GET_IFINDEX,
134 "getifindex",
135 NULL,
136 &ng_parse_int32_type
137 },
138 {
139 NGM_ETHER_COOKIE,
140 NGM_ETHER_GET_ENADDR,
141 "getenaddr",
142 NULL,
143 &ng_parse_enaddr_type
144 },
145 {
146 NGM_ETHER_COOKIE,
147 NGM_ETHER_SET_ENADDR,
148 "setenaddr",
149 &ng_parse_enaddr_type,
150 NULL
151 },
152 {
153 NGM_ETHER_COOKIE,
154 NGM_ETHER_GET_PROMISC,
155 "getpromisc",
156 NULL,
157 &ng_parse_int32_type
158 },
159 {
160 NGM_ETHER_COOKIE,
161 NGM_ETHER_SET_PROMISC,
162 "setpromisc",
163 &ng_parse_int32_type,
164 NULL
165 },
166 {
167 NGM_ETHER_COOKIE,
168 NGM_ETHER_GET_AUTOSRC,
169 "getautosrc",
170 NULL,
171 &ng_parse_int32_type
172 },
173 {
174 NGM_ETHER_COOKIE,
175 NGM_ETHER_SET_AUTOSRC,
176 "setautosrc",
177 &ng_parse_int32_type,
178 NULL
179 },
180 {
181 NGM_ETHER_COOKIE,
182 NGM_ETHER_ADD_MULTI,
183 "addmulti",
184 &ng_parse_enaddr_type,
185 NULL
186 },
187 {
188 NGM_ETHER_COOKIE,
189 NGM_ETHER_DEL_MULTI,
190 "delmulti",
191 &ng_parse_enaddr_type,
192 NULL
193 },
194 {
195 NGM_ETHER_COOKIE,
196 NGM_ETHER_DETACH,
197 "detach",
198 NULL,
199 NULL
200 },
201 { 0 }
202 };
203
204 static struct ng_type ng_ether_typestruct = {
205 .version = NG_ABI_VERSION,
206 .name = NG_ETHER_NODE_TYPE,
207 .mod_event = ng_ether_mod_event,
208 .constructor = ng_ether_constructor,
209 .rcvmsg = ng_ether_rcvmsg,
210 .shutdown = ng_ether_shutdown,
211 .newhook = ng_ether_newhook,
212 .rcvdata = ng_ether_rcvdata,
213 .disconnect = ng_ether_disconnect,
214 .cmdlist = ng_ether_cmdlist,
215 };
216 NETGRAPH_INIT(ether, &ng_ether_typestruct);
217
218 /******************************************************************
219 UTILITY FUNCTIONS
220 ******************************************************************/
221 static void
ng_ether_sanitize_ifname(const char * ifname,char * name)222 ng_ether_sanitize_ifname(const char *ifname, char *name)
223 {
224 int i;
225
226 for (i = 0; i < IFNAMSIZ; i++) {
227 if (ifname[i] == '.' || ifname[i] == ':')
228 name[i] = '_';
229 else
230 name[i] = ifname[i];
231 if (name[i] == '\0')
232 break;
233 }
234 }
235
236 /******************************************************************
237 ETHERNET FUNCTION HOOKS
238 ******************************************************************/
239
240 /*
241 * Handle a packet that has come in on an interface. We get to
242 * look at it here before any upper layer protocols do.
243 *
244 * NOTE: this function will get called at splimp()
245 */
246 static void
ng_ether_input(struct ifnet * ifp,struct mbuf ** mp)247 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
248 {
249 const node_p node = IFP2NG(ifp);
250 const priv_p priv = NG_NODE_PRIVATE(node);
251 int error;
252
253 /* If "lower" hook not connected, let packet continue */
254 if (priv->lower == NULL)
255 return;
256 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
257 }
258
259 /*
260 * Handle a packet that has come in on an interface, and which
261 * does not match any of our known protocols (an ``orphan'').
262 *
263 * NOTE: this function will get called at splimp()
264 */
265 static void
ng_ether_input_orphan(struct ifnet * ifp,struct mbuf * m)266 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
267 {
268 const node_p node = IFP2NG(ifp);
269 const priv_p priv = NG_NODE_PRIVATE(node);
270 int error;
271
272 /* If "orphan" hook not connected, discard packet */
273 if (priv->orphan == NULL) {
274 m_freem(m);
275 return;
276 }
277 NG_SEND_DATA_ONLY(error, priv->orphan, m);
278 }
279
280 /*
281 * Handle a packet that is going out on an interface.
282 * The Ethernet header is already attached to the mbuf.
283 */
284 static int
ng_ether_output(struct ifnet * ifp,struct mbuf ** mp)285 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
286 {
287 const node_p node = IFP2NG(ifp);
288 const priv_p priv = NG_NODE_PRIVATE(node);
289 int error = 0;
290
291 /* If "upper" hook not connected, let packet continue */
292 if (priv->upper == NULL)
293 return (0);
294
295 /* Send it out "upper" hook */
296 NG_OUTBOUND_THREAD_REF();
297 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
298 NG_OUTBOUND_THREAD_UNREF();
299 return (error);
300 }
301
302 /*
303 * A new Ethernet interface has been attached.
304 * Create a new node for it, etc.
305 */
306 static void
ng_ether_attach(struct ifnet * ifp)307 ng_ether_attach(struct ifnet *ifp)
308 {
309 char name[IFNAMSIZ];
310 priv_p priv;
311 node_p node;
312
313 /*
314 * Do not create / attach an ether node to this ifnet if
315 * a netgraph node with the same name already exists.
316 * This should prevent ether nodes to become attached to
317 * eiface nodes, which may be problematic due to naming
318 * clashes.
319 */
320 if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) {
321 NG_NODE_UNREF(node);
322 return;
323 }
324
325 /* Create node */
326 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
327 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
328 log(LOG_ERR, "%s: can't %s for %s\n",
329 __func__, "create node", ifp->if_xname);
330 return;
331 }
332
333 /* Allocate private data */
334 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
335 if (priv == NULL) {
336 log(LOG_ERR, "%s: can't %s for %s\n",
337 __func__, "allocate memory", ifp->if_xname);
338 NG_NODE_UNREF(node);
339 return;
340 }
341 NG_NODE_SET_PRIVATE(node, priv);
342 priv->ifp = ifp;
343 IFP2NG(ifp) = node;
344 priv->hwassist = ifp->if_hwassist;
345
346 /* Try to give the node the same name as the interface */
347 ng_ether_sanitize_ifname(ifp->if_xname, name);
348 if (ng_name_node(node, name) != 0)
349 log(LOG_WARNING, "%s: can't name node %s\n", __func__, name);
350 }
351
352 /*
353 * An Ethernet interface is being detached.
354 * REALLY Destroy its node.
355 */
356 static void
ng_ether_detach(struct ifnet * ifp)357 ng_ether_detach(struct ifnet *ifp)
358 {
359 const node_p node = IFP2NG(ifp);
360 const priv_p priv = NG_NODE_PRIVATE(node);
361
362 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
363 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
364 /*
365 * We can't assume the ifnet is still around when we run shutdown
366 * So zap it now. XXX We HOPE that anything running at this time
367 * handles it (as it should in the non netgraph case).
368 */
369 IFP2NG(ifp) = NULL;
370 priv->ifp = NULL; /* XXX race if interrupted an output packet */
371 ng_rmnode_self(node); /* remove all netgraph parts */
372 }
373
374 /*
375 * Notify graph about link event.
376 * if_link_state_change() has already checked that the state has changed.
377 */
378 static void
ng_ether_link_state(struct ifnet * ifp,int state)379 ng_ether_link_state(struct ifnet *ifp, int state)
380 {
381 const node_p node = IFP2NG(ifp);
382 const priv_p priv = NG_NODE_PRIVATE(node);
383 struct ng_mesg *msg;
384 int cmd, dummy_error = 0;
385
386 if (state == LINK_STATE_UP)
387 cmd = NGM_LINK_IS_UP;
388 else if (state == LINK_STATE_DOWN)
389 cmd = NGM_LINK_IS_DOWN;
390 else
391 return;
392
393 if (priv->lower != NULL) {
394 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
395 if (msg != NULL)
396 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
397 }
398 if (priv->orphan != NULL) {
399 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
400 if (msg != NULL)
401 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0);
402 }
403 }
404
405 /*
406 * Interface arrival notification handler.
407 * The notification is produced in two cases:
408 * o a new interface arrives
409 * o an existing interface got renamed
410 * Currently the first case is handled by ng_ether_attach via special
411 * hook ng_ether_attach_p.
412 */
413 static void
ng_ether_ifnet_arrival_event(void * arg __unused,struct ifnet * ifp)414 ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp)
415 {
416 char name[IFNAMSIZ];
417 node_p node;
418
419 /* Only ethernet interfaces are of interest. */
420 if (ifp->if_type != IFT_ETHER
421 && ifp->if_type != IFT_L2VLAN)
422 return;
423
424 /*
425 * Just return if it's a new interface without an ng_ether companion.
426 */
427 node = IFP2NG(ifp);
428 if (node == NULL)
429 return;
430
431 /* Try to give the node the same name as the new interface name */
432 ng_ether_sanitize_ifname(ifp->if_xname, name);
433 if (ng_name_node(node, name) != 0)
434 log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name);
435 }
436
437 /******************************************************************
438 NETGRAPH NODE METHODS
439 ******************************************************************/
440
441 /*
442 * It is not possible or allowable to create a node of this type.
443 * Nodes get created when the interface is attached (or, when
444 * this node type's KLD is loaded).
445 */
446 static int
ng_ether_constructor(node_p node)447 ng_ether_constructor(node_p node)
448 {
449 return (EINVAL);
450 }
451
452 /*
453 * Check for attaching a new hook.
454 */
455 static int
ng_ether_newhook(node_p node,hook_p hook,const char * name)456 ng_ether_newhook(node_p node, hook_p hook, const char *name)
457 {
458 const priv_p priv = NG_NODE_PRIVATE(node);
459 hook_p *hookptr;
460
461 /* Divert hook is an alias for lower */
462 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
463 name = NG_ETHER_HOOK_LOWER;
464
465 /* Which hook? */
466 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
467 hookptr = &priv->upper;
468 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
469 NG_HOOK_SET_TO_INBOUND(hook);
470 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
471 hookptr = &priv->lower;
472 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
473 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
474 hookptr = &priv->orphan;
475 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
476 } else
477 return (EINVAL);
478
479 /* Check if already connected (shouldn't be, but doesn't hurt) */
480 if (*hookptr != NULL)
481 return (EISCONN);
482
483 /* Disable hardware checksums while 'upper' hook is connected */
484 if (hookptr == &priv->upper)
485 priv->ifp->if_hwassist = 0;
486 NG_HOOK_HI_STACK(hook);
487 /* OK */
488 *hookptr = hook;
489 return (0);
490 }
491
492 /*
493 * Receive an incoming control message.
494 */
495 static int
ng_ether_rcvmsg(node_p node,item_p item,hook_p lasthook)496 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
497 {
498 const priv_p priv = NG_NODE_PRIVATE(node);
499 struct ng_mesg *resp = NULL;
500 int error = 0;
501 struct ng_mesg *msg;
502
503 NGI_GET_MSG(item, msg);
504 switch (msg->header.typecookie) {
505 case NGM_ETHER_COOKIE:
506 switch (msg->header.cmd) {
507 case NGM_ETHER_GET_IFNAME:
508 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
509 if (resp == NULL) {
510 error = ENOMEM;
511 break;
512 }
513 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
514 break;
515 case NGM_ETHER_GET_IFINDEX:
516 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
517 if (resp == NULL) {
518 error = ENOMEM;
519 break;
520 }
521 *((u_int32_t *)resp->data) = priv->ifp->if_index;
522 break;
523 case NGM_ETHER_GET_ENADDR:
524 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
525 if (resp == NULL) {
526 error = ENOMEM;
527 break;
528 }
529 bcopy(IF_LLADDR(priv->ifp),
530 resp->data, ETHER_ADDR_LEN);
531 break;
532 case NGM_ETHER_SET_ENADDR:
533 {
534 if (msg->header.arglen != ETHER_ADDR_LEN) {
535 error = EINVAL;
536 break;
537 }
538 error = if_setlladdr(priv->ifp,
539 (u_char *)msg->data, ETHER_ADDR_LEN);
540 EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
541 break;
542 }
543 case NGM_ETHER_GET_PROMISC:
544 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
545 if (resp == NULL) {
546 error = ENOMEM;
547 break;
548 }
549 *((u_int32_t *)resp->data) = priv->promisc;
550 break;
551 case NGM_ETHER_SET_PROMISC:
552 {
553 u_char want;
554
555 if (msg->header.arglen != sizeof(u_int32_t)) {
556 error = EINVAL;
557 break;
558 }
559 want = !!*((u_int32_t *)msg->data);
560 if (want ^ priv->promisc) {
561 if ((error = ifpromisc(priv->ifp, want)) != 0)
562 break;
563 priv->promisc = want;
564 }
565 break;
566 }
567 case NGM_ETHER_GET_AUTOSRC:
568 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
569 if (resp == NULL) {
570 error = ENOMEM;
571 break;
572 }
573 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
574 break;
575 case NGM_ETHER_SET_AUTOSRC:
576 if (msg->header.arglen != sizeof(u_int32_t)) {
577 error = EINVAL;
578 break;
579 }
580 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
581 break;
582 case NGM_ETHER_ADD_MULTI:
583 {
584 struct sockaddr_dl sa_dl;
585 struct ifmultiaddr *ifma;
586
587 if (msg->header.arglen != ETHER_ADDR_LEN) {
588 error = EINVAL;
589 break;
590 }
591 bzero(&sa_dl, sizeof(struct sockaddr_dl));
592 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
593 sa_dl.sdl_family = AF_LINK;
594 sa_dl.sdl_alen = ETHER_ADDR_LEN;
595 bcopy((void *)msg->data, LLADDR(&sa_dl),
596 ETHER_ADDR_LEN);
597 /*
598 * Netgraph is only permitted to join groups once
599 * via the if_addmulti() KPI, because it cannot hold
600 * struct ifmultiaddr * between calls. It may also
601 * lose a race while we check if the membership
602 * already exists.
603 */
604 if_maddr_rlock(priv->ifp);
605 ifma = if_findmulti(priv->ifp,
606 (struct sockaddr *)&sa_dl);
607 if_maddr_runlock(priv->ifp);
608 if (ifma != NULL) {
609 error = EADDRINUSE;
610 } else {
611 error = if_addmulti(priv->ifp,
612 (struct sockaddr *)&sa_dl, &ifma);
613 }
614 break;
615 }
616 case NGM_ETHER_DEL_MULTI:
617 {
618 struct sockaddr_dl sa_dl;
619
620 if (msg->header.arglen != ETHER_ADDR_LEN) {
621 error = EINVAL;
622 break;
623 }
624 bzero(&sa_dl, sizeof(struct sockaddr_dl));
625 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
626 sa_dl.sdl_family = AF_LINK;
627 sa_dl.sdl_alen = ETHER_ADDR_LEN;
628 bcopy((void *)msg->data, LLADDR(&sa_dl),
629 ETHER_ADDR_LEN);
630 error = if_delmulti(priv->ifp,
631 (struct sockaddr *)&sa_dl);
632 break;
633 }
634 case NGM_ETHER_DETACH:
635 ng_ether_detach(priv->ifp);
636 break;
637 default:
638 error = EINVAL;
639 break;
640 }
641 break;
642 default:
643 error = EINVAL;
644 break;
645 }
646 NG_RESPOND_MSG(error, node, item, resp);
647 NG_FREE_MSG(msg);
648 return (error);
649 }
650
651 /*
652 * Receive data on a hook.
653 * Since we use per-hook recveive methods this should never be called.
654 */
655 static int
ng_ether_rcvdata(hook_p hook,item_p item)656 ng_ether_rcvdata(hook_p hook, item_p item)
657 {
658 NG_FREE_ITEM(item);
659
660 panic("%s: weird hook", __func__);
661 }
662
663 /*
664 * Handle an mbuf received on the "lower" or "orphan" hook.
665 */
666 static int
ng_ether_rcv_lower(hook_p hook,item_p item)667 ng_ether_rcv_lower(hook_p hook, item_p item)
668 {
669 struct mbuf *m;
670 const node_p node = NG_HOOK_NODE(hook);
671 const priv_p priv = NG_NODE_PRIVATE(node);
672 struct ifnet *const ifp = priv->ifp;
673
674 NGI_GET_M(item, m);
675 NG_FREE_ITEM(item);
676
677 /* Check whether interface is ready for packets */
678
679 if (!((ifp->if_flags & IFF_UP) &&
680 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
681 NG_FREE_M(m);
682 return (ENETDOWN);
683 }
684
685 /* Make sure header is fully pulled up */
686 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
687 NG_FREE_M(m);
688 return (EINVAL);
689 }
690 if (m->m_len < sizeof(struct ether_header)
691 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
692 return (ENOBUFS);
693
694 /* Drop in the MAC address if desired */
695 if (priv->autoSrcAddr) {
696
697 /* Make the mbuf writable if it's not already */
698 if (!M_WRITABLE(m)
699 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
700 return (ENOBUFS);
701
702 /* Overwrite source MAC address */
703 bcopy(IF_LLADDR(ifp),
704 mtod(m, struct ether_header *)->ether_shost,
705 ETHER_ADDR_LEN);
706 }
707
708 /* Send it on its way */
709 return ether_output_frame(ifp, m);
710 }
711
712 /*
713 * Handle an mbuf received on the "upper" hook.
714 */
715 static int
ng_ether_rcv_upper(hook_p hook,item_p item)716 ng_ether_rcv_upper(hook_p hook, item_p item)
717 {
718 struct mbuf *m;
719 const node_p node = NG_HOOK_NODE(hook);
720 const priv_p priv = NG_NODE_PRIVATE(node);
721 struct ifnet *ifp = priv->ifp;
722
723 NGI_GET_M(item, m);
724 NG_FREE_ITEM(item);
725
726 /* Check length and pull off header */
727 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
728 NG_FREE_M(m);
729 return (EINVAL);
730 }
731 if (m->m_len < sizeof(struct ether_header) &&
732 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
733 return (ENOBUFS);
734
735 m->m_pkthdr.rcvif = ifp;
736
737 /* Pass the packet to the bridge, it may come back to us */
738 if (ifp->if_bridge) {
739 BRIDGE_INPUT(ifp, m);
740 if (m == NULL)
741 return (0);
742 }
743
744 /* Route packet back in */
745 ether_demux(ifp, m);
746 return (0);
747 }
748
749 /*
750 * Shutdown node. This resets the node but does not remove it
751 * unless the REALLY_DIE flag is set.
752 */
753 static int
ng_ether_shutdown(node_p node)754 ng_ether_shutdown(node_p node)
755 {
756 const priv_p priv = NG_NODE_PRIVATE(node);
757
758 if (node->nd_flags & NGF_REALLY_DIE) {
759 /*
760 * WE came here because the ethernet card is being unloaded,
761 * so stop being persistant.
762 * Actually undo all the things we did on creation.
763 * Assume the ifp has already been freed.
764 */
765 NG_NODE_SET_PRIVATE(node, NULL);
766 free(priv, M_NETGRAPH);
767 NG_NODE_UNREF(node); /* free node itself */
768 return (0);
769 }
770 if (priv->promisc) { /* disable promiscuous mode */
771 (void)ifpromisc(priv->ifp, 0);
772 priv->promisc = 0;
773 }
774 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
775
776 return (0);
777 }
778
779 /*
780 * Hook disconnection.
781 */
782 static int
ng_ether_disconnect(hook_p hook)783 ng_ether_disconnect(hook_p hook)
784 {
785 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
786
787 if (hook == priv->upper) {
788 priv->upper = NULL;
789 if (priv->ifp != NULL) /* restore h/w csum */
790 priv->ifp->if_hwassist = priv->hwassist;
791 } else if (hook == priv->lower)
792 priv->lower = NULL;
793 else if (hook == priv->orphan)
794 priv->orphan = NULL;
795 else
796 panic("%s: weird hook", __func__);
797 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
798 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
799 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
800 return (0);
801 }
802
803 /******************************************************************
804 INITIALIZATION
805 ******************************************************************/
806
807 /*
808 * Handle loading and unloading for this node type.
809 */
810 static int
ng_ether_mod_event(module_t mod,int event,void * data)811 ng_ether_mod_event(module_t mod, int event, void *data)
812 {
813 int error = 0;
814 int s;
815
816 s = splnet();
817 switch (event) {
818 case MOD_LOAD:
819
820 /* Register function hooks */
821 if (ng_ether_attach_p != NULL) {
822 error = EEXIST;
823 break;
824 }
825 ng_ether_attach_p = ng_ether_attach;
826 ng_ether_detach_p = ng_ether_detach;
827 ng_ether_output_p = ng_ether_output;
828 ng_ether_input_p = ng_ether_input;
829 ng_ether_input_orphan_p = ng_ether_input_orphan;
830 ng_ether_link_state_p = ng_ether_link_state;
831
832 ng_ether_ifnet_arrival_cookie =
833 EVENTHANDLER_REGISTER(ifnet_arrival_event,
834 ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY);
835 break;
836
837 case MOD_UNLOAD:
838
839 /*
840 * Note that the base code won't try to unload us until
841 * all nodes have been removed, and that can't happen
842 * until all Ethernet interfaces are removed. In any
843 * case, we know there are no nodes left if the action
844 * is MOD_UNLOAD, so there's no need to detach any nodes.
845 */
846
847 EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
848 ng_ether_ifnet_arrival_cookie);
849
850 /* Unregister function hooks */
851 ng_ether_attach_p = NULL;
852 ng_ether_detach_p = NULL;
853 ng_ether_output_p = NULL;
854 ng_ether_input_p = NULL;
855 ng_ether_input_orphan_p = NULL;
856 ng_ether_link_state_p = NULL;
857 break;
858
859 default:
860 error = EOPNOTSUPP;
861 break;
862 }
863 splx(s);
864 return (error);
865 }
866
867 static void
vnet_ng_ether_init(const void * unused)868 vnet_ng_ether_init(const void *unused)
869 {
870 struct ifnet *ifp;
871
872 /* If module load was rejected, don't attach to vnets. */
873 if (ng_ether_attach_p != ng_ether_attach)
874 return;
875
876 /* Create nodes for any already-existing Ethernet interfaces. */
877 IFNET_RLOCK();
878 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
879 if (ifp->if_type == IFT_ETHER
880 || ifp->if_type == IFT_L2VLAN)
881 ng_ether_attach(ifp);
882 }
883 IFNET_RUNLOCK();
884 }
885 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
886 vnet_ng_ether_init, NULL);
887