FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_fec.c
1 /*
2 * ng_fec.c
3 */
4
5 /*-
6 * Copyright (c) 2001 Berkeley Software Design, Inc.
7 * Copyright (c) 2000, 2001
8 * Bill Paul <wpaul@osd.bsdi.com>. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Bill Paul.
21 * 4. Neither the name of the author nor the names of any co-contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
35 * THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * $FreeBSD: releng/10.0/sys/netgraph/ng_fec.c 249925 2013-04-26 12:50:32Z glebius $
38 */
39 /*-
40 * Copyright (c) 1996-1999 Whistle Communications, Inc.
41 * All rights reserved.
42 *
43 * Subject to the following obligations and disclaimer of warranty, use and
44 * redistribution of this software, in source or object code forms, with or
45 * without modifications are expressly permitted by Whistle Communications;
46 * provided, however, that:
47 * 1. Any and all reproductions of the source or object code must include the
48 * copyright notice above and the following disclaimer of warranties; and
49 * 2. No rights are granted, in any manner or form, to use Whistle
50 * Communications, Inc. trademarks, including the mark "WHISTLE
51 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
52 * such appears in the above copyright notice or in the software.
53 *
54 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
55 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
56 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
57 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
58 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
59 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
60 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
61 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
62 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
63 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
64 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
65 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
66 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
67 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
68 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
69 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
70 * OF SUCH DAMAGE.
71 *
72 * Author: Archie Cobbs <archie@freebsd.org>
73 *
74 * $Whistle: ng_fec.c,v 1.33 1999/11/01 09:24:51 julian Exp $
75 */
76
77 /*
78 * This module implements ethernet channel bonding using the Cisco
79 * Fast EtherChannel mechanism. Two or four ports may be combined
80 * into a single aggregate interface.
81 *
82 * Interfaces are named fec0, fec1, etc. New nodes take the
83 * first available interface name.
84 *
85 * This node also includes Berkeley packet filter support.
86 *
87 * Note that this node doesn't need to connect to any other
88 * netgraph nodes in order to do its work.
89 */
90
91 #include <sys/param.h>
92 #include <sys/systm.h>
93 #include <sys/errno.h>
94 #include <sys/kernel.h>
95 #include <sys/malloc.h>
96 #include <sys/mbuf.h>
97 #include <sys/errno.h>
98 #include <sys/sockio.h>
99 #include <sys/socket.h>
100 #include <sys/syslog.h>
101 #include <sys/libkern.h>
102 #include <sys/queue.h>
103
104 #include <net/if.h>
105 #include <net/if_dl.h>
106 #include <net/if_types.h>
107 #include <net/if_media.h>
108 #include <net/bpf.h>
109 #include <net/ethernet.h>
110 #include <net/route.h>
111
112 #include "opt_inet.h"
113 #include "opt_inet6.h"
114
115 #include <netinet/in.h>
116 #ifdef INET
117 #include <netinet/in_systm.h>
118 #include <netinet/ip.h>
119 #endif
120
121 #ifdef INET6
122 #include <netinet/ip6.h>
123 #endif
124
125 #include <netgraph/ng_message.h>
126 #include <netgraph/netgraph.h>
127 #include <netgraph/ng_parse.h>
128 #include <netgraph/ng_fec.h>
129
130 /*
131 * We need a way to stash a pointer to our netgraph node in the
132 * ifnet structure so that receive handling works. As far as I can
133 * tell, although there is an AF_NETGRAPH address family, it's only
134 * used to identify sockaddr_ng structures: there is no netgraph address
135 * family domain. This means the AF_NETGRAPH entry in ifp->if_afdata
136 * should be unused, so we can use to hold our node context.
137 */
138 #define IFP2NG(ifp) ((ifp)->if_afdata[AF_NETGRAPH])
139
140 /*
141 * Current fast etherchannel implementations use either 2 or 4
142 * ports, so for now we limit the maximum bundle size to 4 interfaces.
143 */
144 #define FEC_BUNDLESIZ 4
145
146 struct ng_fec_portlist {
147 struct ifnet *fec_if;
148 void (*fec_if_input) (struct ifnet *,
149 struct mbuf *);
150 int fec_idx;
151 int fec_ifstat;
152 struct ether_addr fec_mac;
153 SLIST_HEAD(__mclhd, ng_fec_mc) fec_mc_head;
154 TAILQ_ENTRY(ng_fec_portlist) fec_list;
155 };
156
157 struct ng_fec_mc {
158 struct ifmultiaddr *mc_ifma;
159 SLIST_ENTRY(ng_fec_mc) mc_entries;
160 };
161
162 struct ng_fec_bundle {
163 TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports;
164 int fec_ifcnt;
165 int fec_btype;
166 int (*fec_if_output) (struct ifnet *,
167 struct mbuf *,
168 const struct sockaddr *,
169 struct route *);
170 };
171
172 #define FEC_BTYPE_MAC 0x01
173 #define FEC_BTYPE_INET 0x02
174 #define FEC_BTYPE_INET6 0x03
175
176 /* Node private data */
177 struct ng_fec_private {
178 struct ifnet *ifp;
179 struct ifmedia ifmedia;
180 int if_flags;
181 int if_error; /* XXX */
182 int unit; /* Interface unit number */
183 node_p node; /* Our netgraph node */
184 struct ng_fec_bundle fec_bundle;/* Aggregate bundle */
185 struct callout_handle fec_ch; /* callout handle for ticker */
186 };
187 typedef struct ng_fec_private *priv_p;
188
189 /* Interface methods */
190 static void ng_fec_input(struct ifnet *, struct mbuf *);
191 static void ng_fec_start(struct ifnet *ifp);
192 static int ng_fec_choose_port(struct ng_fec_bundle *b,
193 struct mbuf *m, struct ifnet **ifp);
194 static int ng_fec_setport(struct ifnet *ifp, u_long cmd, caddr_t data);
195 static void ng_fec_init(void *arg);
196 static void ng_fec_stop(struct ifnet *ifp);
197 static int ng_fec_ifmedia_upd(struct ifnet *ifp);
198 static void ng_fec_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
199 static int ng_fec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
200 static int ng_fec_output(struct ifnet *ifp, struct mbuf *m0,
201 const struct sockaddr *dst, struct route *ro);
202 static void ng_fec_tick(void *arg);
203 static int ng_fec_addport(struct ng_fec_private *priv, char *iface);
204 static int ng_fec_delport(struct ng_fec_private *priv, char *iface);
205 static int ng_fec_ether_cmdmulti(struct ifnet *trifp, struct ng_fec_portlist *p, int set);
206
207 #ifdef DEBUG
208 static void ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
209 #endif
210
211 /* Netgraph methods */
212 static int ng_fec_mod_event(module_t, int, void *);
213 static ng_constructor_t ng_fec_constructor;
214 static ng_rcvmsg_t ng_fec_rcvmsg;
215 static ng_shutdown_t ng_fec_shutdown;
216
217 /* List of commands and how to convert arguments to/from ASCII */
218 static const struct ng_cmdlist ng_fec_cmds[] = {
219 {
220 NGM_FEC_COOKIE,
221 NGM_FEC_ADD_IFACE,
222 "add_iface",
223 &ng_parse_string_type,
224 NULL,
225 },
226 {
227 NGM_FEC_COOKIE,
228 NGM_FEC_DEL_IFACE,
229 "del_iface",
230 &ng_parse_string_type,
231 NULL,
232 },
233 {
234 NGM_FEC_COOKIE,
235 NGM_FEC_SET_MODE_MAC,
236 "set_mode_mac",
237 NULL,
238 NULL,
239 },
240 {
241 NGM_FEC_COOKIE,
242 NGM_FEC_SET_MODE_INET,
243 "set_mode_inet",
244 NULL,
245 NULL,
246 },
247 { 0 }
248 };
249
250 /* Node type descriptor */
251 static struct ng_type typestruct = {
252 .version = NG_ABI_VERSION,
253 .name = NG_FEC_NODE_TYPE,
254 .mod_event = ng_fec_mod_event,
255 .constructor = ng_fec_constructor,
256 .rcvmsg = ng_fec_rcvmsg,
257 .shutdown = ng_fec_shutdown,
258 .cmdlist = ng_fec_cmds,
259 };
260 NETGRAPH_INIT(fec, &typestruct);
261
262 /* We keep a bitmap indicating which unit numbers are free.
263 One means the unit number is free, zero means it's taken. */
264 static int *ng_fec_units = NULL;
265 static int ng_fec_units_len = 0;
266 static int ng_units_in_use = 0;
267
268 #define UNITS_BITSPERWORD (sizeof(*ng_fec_units) * NBBY)
269
270 static struct mtx ng_fec_mtx;
271
272 /*
273 * Find the first free unit number for a new interface.
274 * Increase the size of the unit bitmap as necessary.
275 */
276 static __inline int
277 ng_fec_get_unit(int *unit)
278 {
279 int index, bit;
280
281 mtx_lock(&ng_fec_mtx);
282 for (index = 0; index < ng_fec_units_len
283 && ng_fec_units[index] == 0; index++);
284 if (index == ng_fec_units_len) { /* extend array */
285 int i, *newarray, newlen;
286
287 newlen = (2 * ng_fec_units_len) + 4;
288 newarray = malloc(newlen * sizeof(*ng_fec_units),
289 M_NETGRAPH, M_NOWAIT);
290 if (newarray == NULL) {
291 mtx_unlock(&ng_fec_mtx);
292 return (ENOMEM);
293 }
294 bcopy(ng_fec_units, newarray,
295 ng_fec_units_len * sizeof(*ng_fec_units));
296 for (i = ng_fec_units_len; i < newlen; i++)
297 newarray[i] = ~0;
298 if (ng_fec_units != NULL)
299 free(ng_fec_units, M_NETGRAPH);
300 ng_fec_units = newarray;
301 ng_fec_units_len = newlen;
302 }
303 bit = ffs(ng_fec_units[index]) - 1;
304 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
305 ("%s: word=%d bit=%d", __func__, ng_fec_units[index], bit));
306 ng_fec_units[index] &= ~(1 << bit);
307 *unit = (index * UNITS_BITSPERWORD) + bit;
308 ng_units_in_use++;
309 mtx_unlock(&ng_fec_mtx);
310 return (0);
311 }
312
313 /*
314 * Free a no longer needed unit number.
315 */
316 static __inline void
317 ng_fec_free_unit(int unit)
318 {
319 int index, bit;
320
321 index = unit / UNITS_BITSPERWORD;
322 bit = unit % UNITS_BITSPERWORD;
323 mtx_lock(&ng_fec_mtx);
324 KASSERT(index < ng_fec_units_len,
325 ("%s: unit=%d len=%d", __func__, unit, ng_fec_units_len));
326 KASSERT((ng_fec_units[index] & (1 << bit)) == 0,
327 ("%s: unit=%d is free", __func__, unit));
328 ng_fec_units[index] |= (1 << bit);
329 /*
330 * XXX We could think about reducing the size of ng_fec_units[]
331 * XXX here if the last portion is all ones
332 * XXX At least free it if no more units
333 * Needed if we are to eventually be able to unload.
334 */
335 ng_units_in_use--;
336 if (ng_units_in_use == 0) { /* XXX make SMP safe */
337 free(ng_fec_units, M_NETGRAPH);
338 ng_fec_units_len = 0;
339 ng_fec_units = NULL;
340 }
341 mtx_unlock(&ng_fec_mtx);
342 }
343
344 /************************************************************************
345 INTERFACE STUFF
346 ************************************************************************/
347
348 static int
349 ng_fec_addport(struct ng_fec_private *priv, char *iface)
350 {
351 struct ng_fec_bundle *b;
352 struct ifnet *ifp, *bifp;
353 struct ng_fec_portlist *p, *new;
354
355 if (priv == NULL || iface == NULL)
356 return(EINVAL);
357
358 b = &priv->fec_bundle;
359 ifp = priv->ifp;
360
361 /* Only allow reconfiguration if not running. */
362 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
363 printf("fec%d: can't add new iface; bundle is running\n",
364 priv->unit);
365 return (EINVAL);
366 }
367
368 /* Find the interface */
369 bifp = ifunit(iface);
370 if (bifp == NULL) {
371 printf("fec%d: tried to add iface %s, which "
372 "doesn't seem to exist\n", priv->unit, iface);
373 return(ENOENT);
374 }
375
376 /* See if we have room in the bundle */
377 if (b->fec_ifcnt == FEC_BUNDLESIZ) {
378 printf("fec%d: can't add new iface; bundle is full\n",
379 priv->unit);
380 return(ENOSPC);
381 }
382
383 /* See if the interface is already in the bundle */
384 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
385 if (p->fec_if == bifp) {
386 printf("fec%d: iface %s is already in this "
387 "bundle\n", priv->unit, iface);
388 return(EINVAL);
389 }
390 }
391
392 /*
393 * All interfaces must use the same output vector. Once the
394 * user attaches an interface of one type, make all subsequent
395 * interfaces have the same output vector.
396 */
397 if (b->fec_if_output != NULL) {
398 if (b->fec_if_output != bifp->if_output) {
399 printf("fec%d: iface %s is not the same type "
400 "as the other interface(s) already in "
401 "the bundle\n", priv->unit, iface);
402 return(EINVAL);
403 }
404 }
405
406 /* Allocate new list entry. */
407 new = malloc(sizeof(struct ng_fec_portlist), M_NETGRAPH, M_NOWAIT);
408 if (new == NULL)
409 return(ENOMEM);
410
411 IF_AFDATA_LOCK(bifp);
412 IFP2NG(bifp) = priv->node;
413 IF_AFDATA_UNLOCK(bifp);
414
415 /*
416 * If this is the first interface added to the bundle,
417 * use its MAC address for the virtual interface (and,
418 * by extension, all the other ports in the bundle).
419 */
420 if (b->fec_ifcnt == 0)
421 if_setlladdr(ifp, IF_LLADDR(bifp), ETHER_ADDR_LEN);
422
423 b->fec_btype = FEC_BTYPE_MAC;
424 new->fec_idx = b->fec_ifcnt;
425 b->fec_ifcnt++;
426
427 /* Initialise the list of multicast addresses that we own. */
428 SLIST_INIT(&new->fec_mc_head);
429
430 /* Save the real MAC address. */
431 bcopy(IF_LLADDR(bifp),
432 (char *)&new->fec_mac, ETHER_ADDR_LEN);
433
434 /* Set up phony MAC address. */
435 if_setlladdr(bifp, IF_LLADDR(ifp), ETHER_ADDR_LEN);
436 EVENTHANDLER_INVOKE(iflladdr_event, bifp);
437
438 /* Save original input vector */
439 new->fec_if_input = bifp->if_input;
440
441 /* Override it with our own */
442 bifp->if_input = ng_fec_input;
443
444 /* Save output vector too. */
445 if (b->fec_if_output == NULL)
446 b->fec_if_output = bifp->if_output;
447
448 /* Add to the queue */
449 new->fec_if = bifp;
450 new->fec_ifstat = -1;
451 TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list);
452
453 /* Add multicast addresses to this port. */
454 ng_fec_ether_cmdmulti(ifp, new, 1);
455
456 return(0);
457 }
458
459 static int
460 ng_fec_delport(struct ng_fec_private *priv, char *iface)
461 {
462 struct ng_fec_bundle *b;
463 struct ifnet *ifp, *bifp;
464 struct ng_fec_portlist *p;
465
466 if (priv == NULL || iface == NULL)
467 return(EINVAL);
468
469 b = &priv->fec_bundle;
470 ifp = priv->ifp;
471
472 /* Only allow reconfiguration if not running. */
473 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
474 printf("fec%d: can't remove iface; bundle is running\n",
475 priv->unit);
476 return (EINVAL);
477 }
478
479 /* Find the interface */
480 bifp = ifunit(iface);
481 if (bifp == NULL) {
482 printf("fec%d: tried to remove iface %s, which "
483 "doesn't seem to exist\n", priv->unit, iface);
484 return(ENOENT);
485 }
486
487 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
488 if (p->fec_if == bifp)
489 break;
490 }
491
492 if (p == NULL) {
493 printf("fec%d: tried to remove iface %s which "
494 "is not in our bundle\n", priv->unit, iface);
495 return(EINVAL);
496 }
497
498 /* Stop interface */
499 bifp->if_flags &= ~IFF_UP;
500 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
501
502 /* Restore MAC address. */
503 if_setlladdr(bifp, (u_char *)&p->fec_mac, ETHER_ADDR_LEN);
504
505 /* Restore input vector */
506 bifp->if_input = p->fec_if_input;
507
508 /* Remove our node context pointer. */
509 IF_AFDATA_LOCK(bifp);
510 IFP2NG(bifp) = NULL;
511 IF_AFDATA_UNLOCK(bifp);
512
513 /* Delete port */
514 TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list);
515 free(p, M_NETGRAPH);
516 b->fec_ifcnt--;
517
518 if (b->fec_ifcnt == 0)
519 b->fec_if_output = NULL;
520
521 return(0);
522 }
523
524 static int
525 ng_fec_ether_cmdmulti(struct ifnet *trifp, struct ng_fec_portlist *p, int set)
526 {
527 struct ifnet *ifp = p->fec_if;
528 struct ng_fec_mc *mc;
529 struct ifmultiaddr *ifma, *rifma = NULL;
530 struct sockaddr_dl sdl;
531 int error;
532
533 bzero((char *)&sdl, sizeof(sdl));
534 sdl.sdl_len = sizeof(sdl);
535 sdl.sdl_family = AF_LINK;
536 sdl.sdl_type = IFT_ETHER;
537 sdl.sdl_alen = ETHER_ADDR_LEN;
538 sdl.sdl_index = ifp->if_index;
539
540 if (set) {
541 TAILQ_FOREACH(ifma, &trifp->if_multiaddrs, ifma_link) {
542 if (ifma->ifma_addr->sa_family != AF_LINK)
543 continue;
544 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
545 LLADDR(&sdl), ETHER_ADDR_LEN);
546
547 error = if_addmulti(ifp, (struct sockaddr *)&sdl, &rifma);
548 if (error)
549 return (error);
550 mc = malloc(sizeof(struct ng_fec_mc), M_DEVBUF, M_NOWAIT);
551 if (mc == NULL)
552 return (ENOMEM);
553 mc->mc_ifma = rifma;
554 SLIST_INSERT_HEAD(&p->fec_mc_head, mc, mc_entries);
555 }
556 } else {
557 while ((mc = SLIST_FIRST(&p->fec_mc_head)) != NULL) {
558 SLIST_REMOVE(&p->fec_mc_head, mc, ng_fec_mc, mc_entries);
559 if_delmulti_ifma(mc->mc_ifma);
560 free(mc, M_DEVBUF);
561 }
562 }
563 return (0);
564 }
565
566 static int
567 ng_fec_ether_setmulti(struct ifnet *ifp)
568 {
569 struct ng_fec_private *priv;
570 struct ng_fec_bundle *b;
571 struct ng_fec_portlist *p;
572
573 priv = ifp->if_softc;
574 b = &priv->fec_bundle;
575
576 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
577 /* First, remove any existing filter entries. */
578 ng_fec_ether_cmdmulti(ifp, p, 0);
579 /* copy all addresses from the fec interface to the port */
580 ng_fec_ether_cmdmulti(ifp, p, 1);
581 }
582 return (0);
583 }
584
585 /*
586 * Pass an ioctl command down to all the underyling interfaces in a
587 * bundle. Used for setting flags.
588 */
589
590 static int
591 ng_fec_setport(struct ifnet *ifp, u_long command, caddr_t data)
592 {
593 struct ng_fec_private *priv;
594 struct ng_fec_bundle *b;
595 struct ifnet *oifp;
596 struct ng_fec_portlist *p;
597
598 priv = ifp->if_softc;
599 b = &priv->fec_bundle;
600
601 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
602 oifp = p->fec_if;
603 if (oifp != NULL)
604 (*oifp->if_ioctl)(oifp, command, data);
605 }
606
607 return(0);
608 }
609
610 static void
611 ng_fec_init(void *arg)
612 {
613 struct ng_fec_private *priv;
614 struct ng_fec_bundle *b;
615 struct ifnet *ifp, *bifp;
616 struct ng_fec_portlist *p;
617
618 priv = arg;
619 ifp = priv->ifp;
620 b = &priv->fec_bundle;
621
622 if (b->fec_ifcnt != 2 && b->fec_ifcnt != FEC_BUNDLESIZ) {
623 printf("fec%d: invalid bundle "
624 "size: %d\n", priv->unit,
625 b->fec_ifcnt);
626 return;
627 }
628
629 ng_fec_stop(ifp);
630
631 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
632 bifp = p->fec_if;
633 bifp->if_flags |= IFF_UP;
634 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
635 /* mark iface as up and let the monitor check it */
636 p->fec_ifstat = -1;
637 }
638
639 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
640 ifp->if_drv_flags |= IFF_DRV_RUNNING;
641
642 priv->fec_ch = timeout(ng_fec_tick, priv, hz);
643
644 return;
645 }
646
647 static void
648 ng_fec_stop(struct ifnet *ifp)
649 {
650 struct ng_fec_private *priv;
651 struct ng_fec_bundle *b;
652 struct ifnet *bifp;
653 struct ng_fec_portlist *p;
654
655 priv = ifp->if_softc;
656 b = &priv->fec_bundle;
657
658 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
659 bifp = p->fec_if;
660 bifp->if_flags &= ~IFF_UP;
661 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
662 }
663
664 untimeout(ng_fec_tick, priv, priv->fec_ch);
665
666 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
667
668 return;
669 }
670
671 static void
672 ng_fec_tick(void *arg)
673 {
674 struct ng_fec_private *priv;
675 struct ng_fec_bundle *b;
676 struct ifmediareq ifmr;
677 struct ifnet *ifp;
678 struct ng_fec_portlist *p;
679 int error = 0;
680
681 priv = arg;
682 b = &priv->fec_bundle;
683
684 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
685 bzero((char *)&ifmr, sizeof(ifmr));
686 ifp = p->fec_if;
687 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
688 if (error) {
689 printf("fec%d: failed to check status "
690 "of link %s\n", priv->unit, ifp->if_xname);
691 continue;
692 }
693
694 if (ifmr.ifm_status & IFM_AVALID) {
695 if (ifmr.ifm_status & IFM_ACTIVE) {
696 if (p->fec_ifstat == -1 ||
697 p->fec_ifstat == 0) {
698 p->fec_ifstat = 1;
699 printf("fec%d: port %s in bundle "
700 "is up\n", priv->unit,
701 ifp->if_xname);
702 }
703 } else {
704 if (p->fec_ifstat == -1 ||
705 p->fec_ifstat == 1) {
706 p->fec_ifstat = 0;
707 printf("fec%d: port %s in bundle "
708 "is down\n", priv->unit,
709 ifp->if_xname);
710 }
711 }
712 }
713 }
714
715 ifp = priv->ifp;
716 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
717 priv->fec_ch = timeout(ng_fec_tick, priv, hz);
718
719 return;
720 }
721
722 static int
723 ng_fec_ifmedia_upd(struct ifnet *ifp)
724 {
725 return(0);
726 }
727
728 static void ng_fec_ifmedia_sts(struct ifnet *ifp,
729 struct ifmediareq *ifmr)
730 {
731 struct ng_fec_private *priv;
732 struct ng_fec_bundle *b;
733 struct ng_fec_portlist *p;
734
735 priv = ifp->if_softc;
736 b = &priv->fec_bundle;
737
738 ifmr->ifm_status = IFM_AVALID;
739 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
740 if (p->fec_ifstat == 1) {
741 ifmr->ifm_status |= IFM_ACTIVE;
742 break;
743 }
744 }
745
746 return;
747 }
748
749 /*
750 * Process an ioctl for the virtual interface
751 */
752 static int
753 ng_fec_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
754 {
755 struct ifreq *const ifr = (struct ifreq *) data;
756 int error = 0;
757 struct ng_fec_private *priv;
758 struct ng_fec_bundle *b;
759
760 priv = ifp->if_softc;
761 b = &priv->fec_bundle;
762
763 #ifdef DEBUG
764 ng_fec_print_ioctl(ifp, command, data);
765 #endif
766 switch (command) {
767
768 /* These two are mostly handled at a higher layer */
769 case SIOCSIFADDR:
770 case SIOCGIFADDR:
771 error = ether_ioctl(ifp, command, data);
772 break;
773
774 case SIOCSIFMTU:
775 if (ifr->ifr_mtu >= NG_FEC_MTU_MIN &&
776 ifr->ifr_mtu <= NG_FEC_MTU_MAX) {
777 struct ng_fec_portlist *p;
778 struct ifnet *bifp;
779
780 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
781 bifp = p->fec_if;
782 error = (*bifp->if_ioctl)(bifp, SIOCSIFMTU,
783 data);
784 if (error != 0)
785 break;
786 }
787 if (error == 0)
788 ifp->if_mtu = ifr->ifr_mtu;
789 } else
790 error = EINVAL;
791 break;
792
793 /* Set flags */
794 case SIOCSIFFLAGS:
795 /*
796 * If the interface is marked up and stopped, then start it.
797 * If it is marked down and running, then stop it.
798 */
799 if (ifr->ifr_flags & IFF_UP) {
800 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
801 /* Sanity. */
802 if (b->fec_ifcnt != 2 &&
803 b->fec_ifcnt != FEC_BUNDLESIZ) {
804 printf("fec%d: invalid bundle "
805 "size: %d\n", priv->unit,
806 b->fec_ifcnt);
807 error = EINVAL;
808 break;
809 }
810 ng_fec_init(priv);
811 }
812 /*
813 * Bubble down changes in promisc mode to
814 * underlying interfaces.
815 */
816 if ((ifp->if_flags & IFF_PROMISC) !=
817 (priv->if_flags & IFF_PROMISC)) {
818 ng_fec_setport(ifp, command, data);
819 priv->if_flags = ifp->if_flags;
820 }
821 } else {
822 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
823 ng_fec_stop(ifp);
824 }
825 break;
826
827 case SIOCADDMULTI:
828 case SIOCDELMULTI:
829 ng_fec_ether_setmulti(ifp);
830 error = 0;
831 break;
832 case SIOCGIFMEDIA:
833 case SIOCSIFMEDIA:
834 error = ifmedia_ioctl(ifp, ifr, &priv->ifmedia, command);
835 break;
836 /* Stuff that's not supported */
837 case SIOCSIFPHYS:
838 error = EOPNOTSUPP;
839 break;
840
841 default:
842 error = EINVAL;
843 break;
844 }
845 return (error);
846 }
847
848 /*
849 * This routine spies on mbufs received by underlying network device
850 * drivers. When we add an interface to our bundle, we override its
851 * if_input routine with a pointer to ng_fec_input(). This means we
852 * get to look at all the device's packets before sending them to the
853 * real ether_input() for processing by the stack. Once we verify the
854 * packet comes from an interface that's been aggregated into
855 * our bundle, we fix up the rcvif pointer and increment our
856 * packet counters so that it looks like the frames are actually
857 * coming from us.
858 */
859 static void
860 ng_fec_input(struct ifnet *ifp, struct mbuf *m0)
861 {
862 struct ng_node *node;
863 struct ng_fec_private *priv;
864 struct ng_fec_bundle *b;
865 struct ifnet *bifp;
866 struct ng_fec_portlist *p;
867
868 /* Sanity check */
869 if (ifp == NULL || m0 == NULL)
870 return;
871
872 node = IFP2NG(ifp);
873
874 /* Sanity check part II */
875 if (node == NULL)
876 return;
877
878 priv = NG_NODE_PRIVATE(node);
879 b = &priv->fec_bundle;
880 bifp = priv->ifp;
881
882 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
883 if (p->fec_if == m0->m_pkthdr.rcvif)
884 break;
885 }
886
887 /* Wasn't meant for us; leave this frame alone. */
888 if (p == NULL)
889 return;
890
891 /*
892 * Check for a BPF tap on the underlying interface. This
893 * is mainly a debugging aid: it allows tcpdump-ing of an
894 * individual interface in a bundle to work, which it
895 * otherwise would not. BPF tapping of our own aggregate
896 * interface will occur once we call ether_input().
897 */
898 BPF_MTAP(m0->m_pkthdr.rcvif, m0);
899
900 /* Convince the system that this is our frame. */
901 m0->m_pkthdr.rcvif = bifp;
902
903 /*
904 * Count bytes on an individual interface in a bundle.
905 * The bytes will also be added to the aggregate interface
906 * once we call ether_input().
907 */
908 ifp->if_ibytes += m0->m_pkthdr.len;
909
910 bifp->if_ipackets++;
911 (*bifp->if_input)(bifp, m0);
912
913 return;
914 }
915
916 /*
917 * Take a quick peek at the packet and see if it's ok for us to use
918 * the inet or inet6 hash methods on it, if they're enabled. We do
919 * this by setting flags in the mbuf header. Once we've made up our
920 * mind what to do, we pass the frame to output vector for further
921 * processing.
922 */
923
924 static int
925 ng_fec_output(struct ifnet *ifp, struct mbuf *m,
926 const struct sockaddr *dst, struct route *ro)
927 {
928 const priv_p priv = (priv_p) ifp->if_softc;
929 struct ng_fec_bundle *b;
930 int error;
931
932 /* Check interface flags */
933 if (!((ifp->if_flags & IFF_UP) &&
934 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
935 m_freem(m);
936 return (ENETDOWN);
937 }
938
939 b = &priv->fec_bundle;
940
941 switch (b->fec_btype) {
942 case FEC_BTYPE_MAC:
943 m->m_flags |= M_FEC_MAC;
944 break;
945 #ifdef INET
946 case FEC_BTYPE_INET:
947 /*
948 * We can't use the INET address port selection
949 * scheme if this isn't an INET packet.
950 */
951 if (dst->sa_family == AF_INET)
952 m->m_flags |= M_FEC_INET;
953 #ifdef INET6
954 else if (dst->sa_family == AF_INET6)
955 m->m_flags |= M_FEC_INET6;
956 #endif
957 else {
958 #ifdef DEBUG
959 if_printf(ifp, "can't do inet aggregation of non "
960 "inet packet\n");
961 #endif
962 m->m_flags |= M_FEC_MAC;
963 }
964 break;
965 #endif
966 default:
967 if_printf(ifp, "bogus hash type: %d\n",
968 b->fec_btype);
969 m_freem(m);
970 return(EINVAL);
971 break;
972 }
973
974 /*
975 * Pass the frame to the output vector for all the protocol
976 * handling. This will put the ethernet header on the packet
977 * for us.
978 */
979 priv->if_error = 0;
980 error = (*b->fec_if_output)(ifp, m, dst, ro);
981 if (priv->if_error && !error)
982 error = priv->if_error;
983
984 return(error);
985 }
986
987 /*
988 * Apply a hash to the source and destination addresses in the packet
989 * in order to select an interface. Also check link status and handle
990 * dead links accordingly.
991 */
992
993 static int
994 ng_fec_choose_port(struct ng_fec_bundle *b,
995 struct mbuf *m, struct ifnet **ifp)
996 {
997 struct ether_header *eh;
998 struct mbuf *m0;
999 #ifdef INET
1000 struct ip *ip;
1001 #ifdef INET6
1002 struct ip6_hdr *ip6;
1003 #endif
1004 #endif
1005
1006 struct ng_fec_portlist *p;
1007 int port = 0, mask;
1008
1009 /*
1010 * If there are only two ports, mask off all but the
1011 * last bit for XORing. If there are 4, mask off all
1012 * but the last 2 bits.
1013 */
1014 mask = b->fec_ifcnt == 2 ? 0x1 : 0x3;
1015 eh = mtod(m, struct ether_header *);
1016 #ifdef INET
1017 ip = (struct ip *)(mtod(m, char *) +
1018 sizeof(struct ether_header));
1019 #ifdef INET6
1020 ip6 = (struct ip6_hdr *)(mtod(m, char *) +
1021 sizeof(struct ether_header));
1022 #endif
1023 #endif
1024
1025 /*
1026 * The fg_fec_output() routine is supposed to leave a
1027 * flag for us in the mbuf that tells us what hash to
1028 * use, but sometimes a new mbuf is prepended to the
1029 * chain, so we have to search every mbuf in the chain
1030 * to find the flags.
1031 */
1032 m0 = m;
1033 while (m0) {
1034 if (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6))
1035 break;
1036 m0 = m0->m_next;
1037 }
1038 if (m0 == NULL)
1039 return(EINVAL);
1040
1041 switch (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) {
1042 case M_FEC_MAC:
1043 port = (eh->ether_dhost[5] ^
1044 eh->ether_shost[5]) & mask;
1045 break;
1046 #ifdef INET
1047 case M_FEC_INET:
1048 port = (ntohl(ip->ip_dst.s_addr) ^
1049 ntohl(ip->ip_src.s_addr)) & mask;
1050 break;
1051 #ifdef INET6
1052 case M_FEC_INET6:
1053 port = (ip6->ip6_dst.s6_addr[15] ^
1054 ip6->ip6_dst.s6_addr[15]) & mask;
1055 break;
1056 #endif
1057 #endif
1058 default:
1059 return(EINVAL);
1060 break;
1061 }
1062
1063 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
1064 if (port == p->fec_idx)
1065 break;
1066 }
1067
1068 /*
1069 * Now that we've chosen a port, make sure it's
1070 * alive. If it's not alive, cycle through the bundle
1071 * looking for a port that is alive. If we don't find
1072 * any, return an error.
1073 */
1074 if (p->fec_ifstat != 1) {
1075 struct ng_fec_portlist *n = NULL;
1076
1077 n = TAILQ_NEXT(p, fec_list);
1078 if (n == NULL)
1079 n = TAILQ_FIRST(&b->ng_fec_ports);
1080 while (n != p) {
1081 if (n->fec_ifstat == 1)
1082 break;
1083 n = TAILQ_NEXT(n, fec_list);
1084 if (n == NULL)
1085 n = TAILQ_FIRST(&b->ng_fec_ports);
1086 }
1087 if (n == p)
1088 return(EAGAIN);
1089 p = n;
1090 }
1091
1092 *ifp = p->fec_if;
1093
1094 return(0);
1095 }
1096
1097 /*
1098 * Now that the packet has been run through ether_output(), yank it
1099 * off our own send queue and stick it on the queue for the appropriate
1100 * underlying physical interface. Note that if the interface's send
1101 * queue is full, we save an error status in our private netgraph
1102 * space which will eventually be handed up to ng_fec_output(), which
1103 * will return it to the rest of the IP stack. We need to do this
1104 * in order to duplicate the effect of ether_output() returning ENOBUFS
1105 * when it detects that an interface's send queue is full. There's no
1106 * other way to signal the error status from here since the if_start()
1107 * routine is spec'ed to return void.
1108 *
1109 * Once the frame is queued, we call ether_output_frame() to initiate
1110 * transmission.
1111 */
1112 static void
1113 ng_fec_start(struct ifnet *ifp)
1114 {
1115 struct ng_fec_private *priv;
1116 struct ng_fec_bundle *b;
1117 struct ifnet *oifp = NULL;
1118 struct mbuf *m0;
1119 int error;
1120
1121 priv = ifp->if_softc;
1122 b = &priv->fec_bundle;
1123
1124 IF_DEQUEUE(&ifp->if_snd, m0);
1125 if (m0 == NULL)
1126 return;
1127
1128 BPF_MTAP(ifp, m0);
1129
1130 /* Queue up packet on the proper port. */
1131 error = ng_fec_choose_port(b, m0, &oifp);
1132 if (error) {
1133 ifp->if_ierrors++;
1134 m_freem(m0);
1135 priv->if_error = ENOBUFS;
1136 return;
1137 }
1138 ifp->if_opackets++;
1139
1140 priv->if_error = IF_HANDOFF(&oifp->if_snd, m0, oifp) ? 0 : ENOBUFS;
1141
1142 return;
1143 }
1144
1145 #ifdef DEBUG
1146 /*
1147 * Display an ioctl to the virtual interface
1148 */
1149
1150 static void
1151 ng_fec_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
1152 {
1153 char *str;
1154
1155 switch (command & IOC_DIRMASK) {
1156 case IOC_VOID:
1157 str = "IO";
1158 break;
1159 case IOC_OUT:
1160 str = "IOR";
1161 break;
1162 case IOC_IN:
1163 str = "IOW";
1164 break;
1165 case IOC_INOUT:
1166 str = "IORW";
1167 break;
1168 default:
1169 str = "IO??";
1170 }
1171 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
1172 ifp->if_xname,
1173 str,
1174 IOCGROUP(command),
1175 command & 0xff,
1176 IOCPARM_LEN(command));
1177 }
1178 #endif /* DEBUG */
1179
1180 /************************************************************************
1181 NETGRAPH NODE STUFF
1182 ************************************************************************/
1183
1184 /*
1185 * Constructor for a node
1186 */
1187 static int
1188 ng_fec_constructor(node_p node)
1189 {
1190 char ifname[NG_FEC_FEC_NAME_MAX + 1];
1191 struct ifnet *ifp;
1192 priv_p priv;
1193 const uint8_t eaddr[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
1194 struct ng_fec_bundle *b;
1195 int error = 0;
1196
1197 /* Allocate node and interface private structures */
1198 priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
1199
1200 ifp = priv->ifp = if_alloc(IFT_ETHER);
1201 if (ifp == NULL) {
1202 free(priv, M_NETGRAPH);
1203 return (ENOSPC);
1204 }
1205 b = &priv->fec_bundle;
1206
1207 /* Link them together */
1208 ifp->if_softc = priv;
1209
1210 /* Get an interface unit number */
1211 if ((error = ng_fec_get_unit(&priv->unit)) != 0) {
1212 if_free(ifp);
1213 free(priv, M_NETGRAPH);
1214 return (error);
1215 }
1216
1217 /* Link together node and private info */
1218 NG_NODE_SET_PRIVATE(node, priv);
1219 priv->node = node;
1220
1221 /* Initialize interface structure */
1222 if_initname(ifp, NG_FEC_FEC_NAME, priv->unit);
1223 ifp->if_start = ng_fec_start;
1224 ifp->if_ioctl = ng_fec_ioctl;
1225 ifp->if_init = ng_fec_init;
1226 ifp->if_snd.ifq_maxlen = ifqmaxlen;
1227 ifp->if_mtu = NG_FEC_MTU_DEFAULT;
1228 ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST);
1229 ifp->if_addrlen = 0; /* XXX */
1230 ifp->if_hdrlen = 0; /* XXX */
1231 ifp->if_baudrate = 100000000; /* XXX */
1232 TAILQ_INIT(&ifp->if_addrhead); /* XXX useless - done in if_attach */
1233
1234 /* Give this node the same name as the interface (if possible) */
1235 bzero(ifname, sizeof(ifname));
1236 strlcpy(ifname, ifp->if_xname, sizeof(ifname));
1237 if (ng_name_node(node, ifname) != 0)
1238 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
1239
1240 /* Attach the interface */
1241 ether_ifattach(ifp, eaddr);
1242 callout_handle_init(&priv->fec_ch);
1243
1244 /* Override output method with our own */
1245 ifp->if_output = ng_fec_output;
1246
1247 TAILQ_INIT(&b->ng_fec_ports);
1248 b->fec_ifcnt = 0;
1249
1250 ifmedia_init(&priv->ifmedia, 0,
1251 ng_fec_ifmedia_upd, ng_fec_ifmedia_sts);
1252 ifmedia_add(&priv->ifmedia, IFM_ETHER|IFM_NONE, 0, NULL);
1253 ifmedia_set(&priv->ifmedia, IFM_ETHER|IFM_NONE);
1254
1255 /* Done */
1256 return (0);
1257 }
1258
1259 /*
1260 * Receive a control message
1261 */
1262 static int
1263 ng_fec_rcvmsg(node_p node, item_p item, hook_p lasthook)
1264 {
1265 const priv_p priv = NG_NODE_PRIVATE(node);
1266 struct ng_fec_bundle *b;
1267 struct ng_mesg *resp = NULL;
1268 struct ng_mesg *msg;
1269 char *ifname;
1270 int error = 0;
1271
1272 NGI_GET_MSG(item, msg);
1273 b = &priv->fec_bundle;
1274
1275 switch (msg->header.typecookie) {
1276 case NGM_FEC_COOKIE:
1277 switch (msg->header.cmd) {
1278 case NGM_FEC_ADD_IFACE:
1279 ifname = msg->data;
1280 error = ng_fec_addport(priv, ifname);
1281 break;
1282 case NGM_FEC_DEL_IFACE:
1283 ifname = msg->data;
1284 error = ng_fec_delport(priv, ifname);
1285 break;
1286 case NGM_FEC_SET_MODE_MAC:
1287 b->fec_btype = FEC_BTYPE_MAC;
1288 break;
1289 #ifdef INET
1290 case NGM_FEC_SET_MODE_INET:
1291 b->fec_btype = FEC_BTYPE_INET;
1292 break;
1293 #ifdef INET6
1294 case NGM_FEC_SET_MODE_INET6:
1295 b->fec_btype = FEC_BTYPE_INET6;
1296 break;
1297 #endif
1298 #endif
1299 default:
1300 error = EINVAL;
1301 break;
1302 }
1303 break;
1304 default:
1305 error = EINVAL;
1306 break;
1307 }
1308 NG_RESPOND_MSG(error, node, item, resp);
1309 NG_FREE_MSG(msg);
1310 return (error);
1311 }
1312
1313 /*
1314 * Shutdown and remove the node and its associated interface.
1315 */
1316 static int
1317 ng_fec_shutdown(node_p node)
1318 {
1319 const priv_p priv = NG_NODE_PRIVATE(node);
1320 struct ng_fec_bundle *b;
1321 struct ng_fec_portlist *p;
1322
1323 b = &priv->fec_bundle;
1324 ng_fec_stop(priv->ifp);
1325
1326 while (!TAILQ_EMPTY(&b->ng_fec_ports)) {
1327 p = TAILQ_FIRST(&b->ng_fec_ports);
1328 ng_fec_ether_cmdmulti(priv->ifp, p, 0);
1329 ng_fec_delport(priv, p->fec_if->if_xname);
1330 }
1331
1332 ether_ifdetach(priv->ifp);
1333 if_free(priv->ifp);
1334 ifmedia_removeall(&priv->ifmedia);
1335 ng_fec_free_unit(priv->unit);
1336 free(priv, M_NETGRAPH);
1337 NG_NODE_SET_PRIVATE(node, NULL);
1338 NG_NODE_UNREF(node);
1339 return (0);
1340 }
1341
1342 /*
1343 * Handle loading and unloading for this node type.
1344 */
1345 static int
1346 ng_fec_mod_event(module_t mod, int event, void *data)
1347 {
1348 int error = 0;
1349
1350 switch (event) {
1351 case MOD_LOAD:
1352 mtx_init(&ng_fec_mtx, "ng_fec", NULL, MTX_DEF);
1353 break;
1354 case MOD_UNLOAD:
1355 mtx_destroy(&ng_fec_mtx);
1356 break;
1357 default:
1358 error = EOPNOTSUPP;
1359 break;
1360 }
1361 return (error);
1362 }
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