FreeBSD/Linux Kernel Cross Reference
sys/net/if_vlan.c
1 /*-
2 * Copyright 1998 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /*
31 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs.
32 * Might be extended some day to also handle IEEE 802.1p priority
33 * tagging. This is sort of sneaky in the implementation, since
34 * we need to pretend to be enough of an Ethernet implementation
35 * to make arp work. The way we do this is by telling everyone
36 * that we are an Ethernet, and then catch the packets that
37 * ether_output() left on our output queue when it calls
38 * if_start(), rewrite them for use by the real outgoing interface,
39 * and ask it to send them.
40 */
41
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD: releng/7.4/sys/net/if_vlan.c 208383 2010-05-21 16:07:41Z jhb $");
44
45 #include "opt_vlan.h"
46
47 #include <sys/param.h>
48 #include <sys/kernel.h>
49 #include <sys/lock.h>
50 #include <sys/malloc.h>
51 #include <sys/mbuf.h>
52 #include <sys/module.h>
53 #include <sys/rwlock.h>
54 #include <sys/queue.h>
55 #include <sys/socket.h>
56 #include <sys/sockio.h>
57 #include <sys/sysctl.h>
58 #include <sys/systm.h>
59
60 #include <net/bpf.h>
61 #include <net/ethernet.h>
62 #include <net/if.h>
63 #include <net/if_clone.h>
64 #include <net/if_dl.h>
65 #include <net/if_types.h>
66 #include <net/if_vlan_var.h>
67
68 #define VLANNAME "vlan"
69 #define VLAN_DEF_HWIDTH 4
70 #define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST)
71
72 #define UP_AND_RUNNING(ifp) \
73 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING)
74
75 LIST_HEAD(ifvlanhead, ifvlan);
76
77 struct ifvlantrunk {
78 struct ifnet *parent; /* parent interface of this trunk */
79 struct rwlock rw;
80 #ifdef VLAN_ARRAY
81 #define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1)
82 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */
83 #else
84 struct ifvlanhead *hash; /* dynamic hash-list table */
85 uint16_t hmask;
86 uint16_t hwidth;
87 #endif
88 int refcnt;
89 };
90
91 struct vlan_mc_entry {
92 struct ether_addr mc_addr;
93 SLIST_ENTRY(vlan_mc_entry) mc_entries;
94 };
95
96 struct ifvlan {
97 struct ifvlantrunk *ifv_trunk;
98 struct ifnet *ifv_ifp;
99 #define TRUNK(ifv) ((ifv)->ifv_trunk)
100 #define PARENT(ifv) ((ifv)->ifv_trunk->parent)
101 int ifv_pflags; /* special flags we have set on parent */
102 struct ifv_linkmib {
103 int ifvm_encaplen; /* encapsulation length */
104 int ifvm_mtufudge; /* MTU fudged by this much */
105 int ifvm_mintu; /* min transmission unit */
106 uint16_t ifvm_proto; /* encapsulation ethertype */
107 uint16_t ifvm_tag; /* tag to apply on packets leaving if */
108 } ifv_mib;
109 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead;
110 #ifndef VLAN_ARRAY
111 LIST_ENTRY(ifvlan) ifv_list;
112 #endif
113 };
114 #define ifv_proto ifv_mib.ifvm_proto
115 #define ifv_tag ifv_mib.ifvm_tag
116 #define ifv_encaplen ifv_mib.ifvm_encaplen
117 #define ifv_mtufudge ifv_mib.ifvm_mtufudge
118 #define ifv_mintu ifv_mib.ifvm_mintu
119
120 /* Special flags we should propagate to parent. */
121 static struct {
122 int flag;
123 int (*func)(struct ifnet *, int);
124 } vlan_pflags[] = {
125 {IFF_PROMISC, ifpromisc},
126 {IFF_ALLMULTI, if_allmulti},
127 {0, NULL}
128 };
129
130 SYSCTL_DECL(_net_link);
131 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN");
132 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency");
133
134 static int soft_pad = 0;
135 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0,
136 "pad short frames before tagging");
137
138 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface");
139
140 static eventhandler_tag ifdetach_tag;
141
142 /*
143 * We have a global mutex, that is used to serialize configuration
144 * changes and isn't used in normal packet delivery.
145 *
146 * We also have a per-trunk rwlock, that is locked shared on packet
147 * processing and exclusive when configuration is changed.
148 *
149 * The VLAN_ARRAY substitutes the dynamic hash with a static array
150 * with 4096 entries. In theory this can give a boost in processing,
151 * however on practice it does not. Probably this is because array
152 * is too big to fit into CPU cache.
153 */
154 static struct mtx ifv_mtx;
155 #define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF)
156 #define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx)
157 #define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED)
158 #define VLAN_LOCK() mtx_lock(&ifv_mtx)
159 #define VLAN_UNLOCK() mtx_unlock(&ifv_mtx)
160 #define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME)
161 #define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw)
162 #define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw)
163 #define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw)
164 #define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED)
165 #define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw)
166 #define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw)
167 #define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED)
168
169 #ifndef VLAN_ARRAY
170 static void vlan_inithash(struct ifvlantrunk *trunk);
171 static void vlan_freehash(struct ifvlantrunk *trunk);
172 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
173 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
174 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch);
175 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk,
176 uint16_t tag);
177 #endif
178 static void trunk_destroy(struct ifvlantrunk *trunk);
179
180 static void vlan_start(struct ifnet *ifp);
181 static void vlan_init(void *foo);
182 static void vlan_input(struct ifnet *ifp, struct mbuf *m);
183 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr);
184 static int vlan_setflag(struct ifnet *ifp, int flag, int status,
185 int (*func)(struct ifnet *, int));
186 static int vlan_setflags(struct ifnet *ifp, int status);
187 static int vlan_setmulti(struct ifnet *ifp);
188 static void vlan_unconfig(struct ifnet *ifp);
189 static void vlan_unconfig_locked(struct ifnet *ifp);
190 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag);
191 static void vlan_link_state(struct ifnet *ifp, int link);
192 static void vlan_capabilities(struct ifvlan *ifv);
193 static void vlan_trunk_capabilities(struct ifnet *ifp);
194
195 static struct ifnet *vlan_clone_match_ethertag(struct if_clone *,
196 const char *, int *);
197 static int vlan_clone_match(struct if_clone *, const char *);
198 static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t);
199 static int vlan_clone_destroy(struct if_clone *, struct ifnet *);
200
201 static void vlan_ifdetach(void *arg, struct ifnet *ifp);
202
203 static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL,
204 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy);
205
206 #ifndef VLAN_ARRAY
207 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m))
208
209 static void
210 vlan_inithash(struct ifvlantrunk *trunk)
211 {
212 int i, n;
213
214 /*
215 * The trunk must not be locked here since we call malloc(M_WAITOK).
216 * It is OK in case this function is called before the trunk struct
217 * gets hooked up and becomes visible from other threads.
218 */
219
220 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL,
221 ("%s: hash already initialized", __func__));
222
223 trunk->hwidth = VLAN_DEF_HWIDTH;
224 n = 1 << trunk->hwidth;
225 trunk->hmask = n - 1;
226 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK);
227 for (i = 0; i < n; i++)
228 LIST_INIT(&trunk->hash[i]);
229 }
230
231 static void
232 vlan_freehash(struct ifvlantrunk *trunk)
233 {
234 #ifdef INVARIANTS
235 int i;
236
237 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
238 for (i = 0; i < (1 << trunk->hwidth); i++)
239 KASSERT(LIST_EMPTY(&trunk->hash[i]),
240 ("%s: hash table not empty", __func__));
241 #endif
242 free(trunk->hash, M_VLAN);
243 trunk->hash = NULL;
244 trunk->hwidth = trunk->hmask = 0;
245 }
246
247 static int
248 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
249 {
250 int i, b;
251 struct ifvlan *ifv2;
252
253 TRUNK_LOCK_ASSERT(trunk);
254 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
255
256 b = 1 << trunk->hwidth;
257 i = HASH(ifv->ifv_tag, trunk->hmask);
258 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
259 if (ifv->ifv_tag == ifv2->ifv_tag)
260 return (EEXIST);
261
262 /*
263 * Grow the hash when the number of vlans exceeds half of the number of
264 * hash buckets squared. This will make the average linked-list length
265 * buckets/2.
266 */
267 if (trunk->refcnt > (b * b) / 2) {
268 vlan_growhash(trunk, 1);
269 i = HASH(ifv->ifv_tag, trunk->hmask);
270 }
271 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list);
272 trunk->refcnt++;
273
274 return (0);
275 }
276
277 static int
278 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
279 {
280 int i, b;
281 struct ifvlan *ifv2;
282
283 TRUNK_LOCK_ASSERT(trunk);
284 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
285
286 b = 1 << trunk->hwidth;
287 i = HASH(ifv->ifv_tag, trunk->hmask);
288 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
289 if (ifv2 == ifv) {
290 trunk->refcnt--;
291 LIST_REMOVE(ifv2, ifv_list);
292 if (trunk->refcnt < (b * b) / 2)
293 vlan_growhash(trunk, -1);
294 return (0);
295 }
296
297 panic("%s: vlan not found\n", __func__);
298 return (ENOENT); /*NOTREACHED*/
299 }
300
301 /*
302 * Grow the hash larger or smaller if memory permits.
303 */
304 static void
305 vlan_growhash(struct ifvlantrunk *trunk, int howmuch)
306 {
307 struct ifvlan *ifv;
308 struct ifvlanhead *hash2;
309 int hwidth2, i, j, n, n2;
310
311 TRUNK_LOCK_ASSERT(trunk);
312 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
313
314 if (howmuch == 0) {
315 /* Harmless yet obvious coding error */
316 printf("%s: howmuch is 0\n", __func__);
317 return;
318 }
319
320 hwidth2 = trunk->hwidth + howmuch;
321 n = 1 << trunk->hwidth;
322 n2 = 1 << hwidth2;
323 /* Do not shrink the table below the default */
324 if (hwidth2 < VLAN_DEF_HWIDTH)
325 return;
326
327 /* M_NOWAIT because we're called with trunk mutex held */
328 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT);
329 if (hash2 == NULL) {
330 printf("%s: out of memory -- hash size not changed\n",
331 __func__);
332 return; /* We can live with the old hash table */
333 }
334 for (j = 0; j < n2; j++)
335 LIST_INIT(&hash2[j]);
336 for (i = 0; i < n; i++)
337 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) {
338 LIST_REMOVE(ifv, ifv_list);
339 j = HASH(ifv->ifv_tag, n2 - 1);
340 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list);
341 }
342 free(trunk->hash, M_VLAN);
343 trunk->hash = hash2;
344 trunk->hwidth = hwidth2;
345 trunk->hmask = n2 - 1;
346
347 if (bootverbose)
348 if_printf(trunk->parent,
349 "VLAN hash table resized from %d to %d buckets\n", n, n2);
350 }
351
352 static __inline struct ifvlan *
353 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag)
354 {
355 struct ifvlan *ifv;
356
357 TRUNK_LOCK_RASSERT(trunk);
358
359 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list)
360 if (ifv->ifv_tag == tag)
361 return (ifv);
362 return (NULL);
363 }
364
365 #if 0
366 /* Debugging code to view the hashtables. */
367 static void
368 vlan_dumphash(struct ifvlantrunk *trunk)
369 {
370 int i;
371 struct ifvlan *ifv;
372
373 for (i = 0; i < (1 << trunk->hwidth); i++) {
374 printf("%d: ", i);
375 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
376 printf("%s ", ifv->ifv_ifp->if_xname);
377 printf("\n");
378 }
379 }
380 #endif /* 0 */
381 #endif /* !VLAN_ARRAY */
382
383 static void
384 trunk_destroy(struct ifvlantrunk *trunk)
385 {
386 VLAN_LOCK_ASSERT();
387
388 TRUNK_LOCK(trunk);
389 #ifndef VLAN_ARRAY
390 vlan_freehash(trunk);
391 #endif
392 trunk->parent->if_vlantrunk = NULL;
393 TRUNK_UNLOCK(trunk);
394 TRUNK_LOCK_DESTROY(trunk);
395 free(trunk, M_VLAN);
396 }
397
398 /*
399 * Program our multicast filter. What we're actually doing is
400 * programming the multicast filter of the parent. This has the
401 * side effect of causing the parent interface to receive multicast
402 * traffic that it doesn't really want, which ends up being discarded
403 * later by the upper protocol layers. Unfortunately, there's no way
404 * to avoid this: there really is only one physical interface.
405 *
406 * XXX: There is a possible race here if more than one thread is
407 * modifying the multicast state of the vlan interface at the same time.
408 */
409 static int
410 vlan_setmulti(struct ifnet *ifp)
411 {
412 struct ifnet *ifp_p;
413 struct ifmultiaddr *ifma, *rifma = NULL;
414 struct ifvlan *sc;
415 struct vlan_mc_entry *mc;
416 struct sockaddr_dl sdl;
417 int error;
418
419 /*VLAN_LOCK_ASSERT();*/
420
421 /* Find the parent. */
422 sc = ifp->if_softc;
423 ifp_p = PARENT(sc);
424
425 bzero((char *)&sdl, sizeof(sdl));
426 sdl.sdl_len = sizeof(sdl);
427 sdl.sdl_family = AF_LINK;
428 sdl.sdl_index = ifp_p->if_index;
429 sdl.sdl_type = IFT_ETHER;
430 sdl.sdl_alen = ETHER_ADDR_LEN;
431
432 /* First, remove any existing filter entries. */
433 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) {
434 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN);
435 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl);
436 if (error)
437 return (error);
438 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries);
439 free(mc, M_VLAN);
440 }
441
442 /* Now program new ones. */
443 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
444 if (ifma->ifma_addr->sa_family != AF_LINK)
445 continue;
446 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT);
447 if (mc == NULL)
448 return (ENOMEM);
449 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
450 (char *)&mc->mc_addr, ETHER_ADDR_LEN);
451 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries);
452 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
453 LLADDR(&sdl), ETHER_ADDR_LEN);
454 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma);
455 if (error)
456 return (error);
457 }
458
459 return (0);
460 }
461
462 /*
463 * A handler for network interface departure events.
464 * Track departure of trunks here so that we don't access invalid
465 * pointers or whatever if a trunk is ripped from under us, e.g.,
466 * by ejecting its hot-plug card. However, if an ifnet is simply
467 * being renamed, then there's no need to tear down the state.
468 */
469 static void
470 vlan_ifdetach(void *arg __unused, struct ifnet *ifp)
471 {
472 struct ifvlan *ifv;
473 int i;
474
475 /*
476 * Check if it's a trunk interface first of all
477 * to avoid needless locking.
478 */
479 if (ifp->if_vlantrunk == NULL)
480 return;
481
482 /* If the ifnet is just being renamed, don't do anything. */
483 if (ifp->if_flags & IFF_RENAMING)
484 return;
485
486 VLAN_LOCK();
487 /*
488 * OK, it's a trunk. Loop over and detach all vlan's on it.
489 * Check trunk pointer after each vlan_unconfig() as it will
490 * free it and set to NULL after the last vlan was detached.
491 */
492 #ifdef VLAN_ARRAY
493 for (i = 0; i < VLAN_ARRAY_SIZE; i++)
494 if ((ifv = ifp->if_vlantrunk->vlans[i])) {
495 vlan_unconfig_locked(ifv->ifv_ifp);
496 if (ifp->if_vlantrunk == NULL)
497 break;
498 }
499 #else /* VLAN_ARRAY */
500 restart:
501 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++)
502 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) {
503 vlan_unconfig_locked(ifv->ifv_ifp);
504 if (ifp->if_vlantrunk)
505 goto restart; /* trunk->hwidth can change */
506 else
507 break;
508 }
509 #endif /* VLAN_ARRAY */
510 /* Trunk should have been destroyed in vlan_unconfig(). */
511 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__));
512 VLAN_UNLOCK();
513 }
514
515 /*
516 * VLAN support can be loaded as a module. The only place in the
517 * system that's intimately aware of this is ether_input. We hook
518 * into this code through vlan_input_p which is defined there and
519 * set here. Noone else in the system should be aware of this so
520 * we use an explicit reference here.
521 */
522 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *);
523
524 /* For if_link_state_change() eyes only... */
525 extern void (*vlan_link_state_p)(struct ifnet *, int);
526
527 static int
528 vlan_modevent(module_t mod, int type, void *data)
529 {
530
531 switch (type) {
532 case MOD_LOAD:
533 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
534 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
535 if (ifdetach_tag == NULL)
536 return (ENOMEM);
537 VLAN_LOCK_INIT();
538 vlan_input_p = vlan_input;
539 vlan_link_state_p = vlan_link_state;
540 vlan_trunk_cap_p = vlan_trunk_capabilities;
541 if_clone_attach(&vlan_cloner);
542 if (bootverbose)
543 printf("vlan: initialized, using "
544 #ifdef VLAN_ARRAY
545 "full-size arrays"
546 #else
547 "hash tables with chaining"
548 #endif
549
550 "\n");
551 break;
552 case MOD_UNLOAD:
553 if_clone_detach(&vlan_cloner);
554 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag);
555 vlan_input_p = NULL;
556 vlan_link_state_p = NULL;
557 vlan_trunk_cap_p = NULL;
558 VLAN_LOCK_DESTROY();
559 if (bootverbose)
560 printf("vlan: unloaded\n");
561 break;
562 default:
563 return (EOPNOTSUPP);
564 }
565 return (0);
566 }
567
568 static moduledata_t vlan_mod = {
569 "if_vlan",
570 vlan_modevent,
571 0
572 };
573
574 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
575 MODULE_VERSION(if_vlan, 3);
576
577 static struct ifnet *
578 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag)
579 {
580 const char *cp;
581 struct ifnet *ifp;
582 int t;
583
584 /* Check for <etherif>.<vlan> style interface names. */
585 IFNET_RLOCK();
586 TAILQ_FOREACH(ifp, &ifnet, if_link) {
587 if (ifp->if_type != IFT_ETHER)
588 continue;
589 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0)
590 continue;
591 cp = name + strlen(ifp->if_xname);
592 if (*cp++ != '.')
593 continue;
594 if (*cp == '\0')
595 continue;
596 t = 0;
597 for(; *cp >= '' && *cp <= '9'; cp++)
598 t = (t * 10) + (*cp - '');
599 if (*cp != '\0')
600 continue;
601 if (tag != NULL)
602 *tag = t;
603 break;
604 }
605 IFNET_RUNLOCK();
606
607 return (ifp);
608 }
609
610 static int
611 vlan_clone_match(struct if_clone *ifc, const char *name)
612 {
613 const char *cp;
614
615 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL)
616 return (1);
617
618 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0)
619 return (0);
620 for (cp = name + 4; *cp != '\0'; cp++) {
621 if (*cp < '' || *cp > '9')
622 return (0);
623 }
624
625 return (1);
626 }
627
628 static int
629 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
630 {
631 char *dp;
632 int wildcard;
633 int unit;
634 int error;
635 int tag;
636 int ethertag;
637 struct ifvlan *ifv;
638 struct ifnet *ifp;
639 struct ifnet *p;
640 struct vlanreq vlr;
641 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
642
643 /*
644 * There are 3 (ugh) ways to specify the cloned device:
645 * o pass a parameter block with the clone request.
646 * o specify parameters in the text of the clone device name
647 * o specify no parameters and get an unattached device that
648 * must be configured separately.
649 * The first technique is preferred; the latter two are
650 * supported for backwards compatibilty.
651 */
652 if (params) {
653 error = copyin(params, &vlr, sizeof(vlr));
654 if (error)
655 return error;
656 p = ifunit(vlr.vlr_parent);
657 if (p == NULL)
658 return ENXIO;
659 /*
660 * Don't let the caller set up a VLAN tag with
661 * anything except VLID bits.
662 */
663 if (vlr.vlr_tag & ~EVL_VLID_MASK)
664 return (EINVAL);
665 error = ifc_name2unit(name, &unit);
666 if (error != 0)
667 return (error);
668
669 ethertag = 1;
670 tag = vlr.vlr_tag;
671 wildcard = (unit < 0);
672 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) {
673 ethertag = 1;
674 unit = -1;
675 wildcard = 0;
676
677 /*
678 * Don't let the caller set up a VLAN tag with
679 * anything except VLID bits.
680 */
681 if (tag & ~EVL_VLID_MASK)
682 return (EINVAL);
683 } else {
684 ethertag = 0;
685
686 error = ifc_name2unit(name, &unit);
687 if (error != 0)
688 return (error);
689
690 wildcard = (unit < 0);
691 }
692
693 error = ifc_alloc_unit(ifc, &unit);
694 if (error != 0)
695 return (error);
696
697 /* In the wildcard case, we need to update the name. */
698 if (wildcard) {
699 for (dp = name; *dp != '\0'; dp++);
700 if (snprintf(dp, len - (dp-name), "%d", unit) >
701 len - (dp-name) - 1) {
702 panic("%s: interface name too long", __func__);
703 }
704 }
705
706 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO);
707 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER);
708 if (ifp == NULL) {
709 ifc_free_unit(ifc, unit);
710 free(ifv, M_VLAN);
711 return (ENOSPC);
712 }
713 SLIST_INIT(&ifv->vlan_mc_listhead);
714
715 ifp->if_softc = ifv;
716 /*
717 * Set the name manually rather than using if_initname because
718 * we don't conform to the default naming convention for interfaces.
719 */
720 strlcpy(ifp->if_xname, name, IFNAMSIZ);
721 ifp->if_dname = ifc->ifc_name;
722 ifp->if_dunit = unit;
723 /* NB: flags are not set here */
724 ifp->if_linkmib = &ifv->ifv_mib;
725 ifp->if_linkmiblen = sizeof(ifv->ifv_mib);
726 /* NB: mtu is not set here */
727
728 ifp->if_init = vlan_init;
729 ifp->if_start = vlan_start;
730 ifp->if_ioctl = vlan_ioctl;
731 ifp->if_snd.ifq_maxlen = ifqmaxlen;
732 ifp->if_flags = VLAN_IFFLAGS;
733 ether_ifattach(ifp, eaddr);
734 /* Now undo some of the damage... */
735 ifp->if_baudrate = 0;
736 ifp->if_type = IFT_L2VLAN;
737 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN;
738
739 if (ethertag) {
740 error = vlan_config(ifv, p, tag);
741 if (error != 0) {
742 /*
743 * Since we've partialy failed, we need to back
744 * out all the way, otherwise userland could get
745 * confused. Thus, we destroy the interface.
746 */
747 ether_ifdetach(ifp);
748 vlan_unconfig(ifp);
749 if_free_type(ifp, IFT_ETHER);
750 ifc_free_unit(ifc, unit);
751 free(ifv, M_VLAN);
752
753 return (error);
754 }
755
756 /* Update flags on the parent, if necessary. */
757 vlan_setflags(ifp, 1);
758 }
759
760 return (0);
761 }
762
763 static int
764 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
765 {
766 struct ifvlan *ifv = ifp->if_softc;
767 int unit = ifp->if_dunit;
768
769 ether_ifdetach(ifp); /* first, remove it from system-wide lists */
770 vlan_unconfig(ifp); /* now it can be unconfigured and freed */
771 if_free_type(ifp, IFT_ETHER);
772 free(ifv, M_VLAN);
773 ifc_free_unit(ifc, unit);
774
775 return (0);
776 }
777
778 /*
779 * The ifp->if_init entry point for vlan(4) is a no-op.
780 */
781 static void
782 vlan_init(void *foo __unused)
783 {
784 }
785
786 /*
787 * The if_start method for vlan(4) interface. It doesn't
788 * raises the IFF_DRV_OACTIVE flag, since it is called
789 * only from IFQ_HANDOFF() macro in ether_output_frame().
790 * If the interface queue is full, and vlan_start() is
791 * not called, the queue would never get emptied and
792 * interface would stall forever.
793 */
794 static void
795 vlan_start(struct ifnet *ifp)
796 {
797 struct ifvlan *ifv;
798 struct ifnet *p;
799 struct mbuf *m;
800 int error;
801
802 ifv = ifp->if_softc;
803 p = PARENT(ifv);
804
805 for (;;) {
806 IF_DEQUEUE(&ifp->if_snd, m);
807 if (m == NULL)
808 break;
809 BPF_MTAP(ifp, m);
810
811 /*
812 * Do not run parent's if_start() if the parent is not up,
813 * or parent's driver will cause a system crash.
814 */
815 if (!UP_AND_RUNNING(p)) {
816 m_freem(m);
817 ifp->if_collisions++;
818 continue;
819 }
820
821 /*
822 * Pad the frame to the minimum size allowed if told to.
823 * This option is in accord with IEEE Std 802.1Q, 2003 Ed.,
824 * paragraph C.4.4.3.b. It can help to work around buggy
825 * bridges that violate paragraph C.4.4.3.a from the same
826 * document, i.e., fail to pad short frames after untagging.
827 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but
828 * untagging it will produce a 62-byte frame, which is a runt
829 * and requires padding. There are VLAN-enabled network
830 * devices that just discard such runts instead or mishandle
831 * them somehow.
832 */
833 if (soft_pad) {
834 static char pad[8]; /* just zeros */
835 int n;
836
837 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len;
838 n > 0; n -= sizeof(pad))
839 if (!m_append(m, min(n, sizeof(pad)), pad))
840 break;
841
842 if (n > 0) {
843 if_printf(ifp, "cannot pad short frame\n");
844 ifp->if_oerrors++;
845 m_freem(m);
846 continue;
847 }
848 }
849
850 /*
851 * If underlying interface can do VLAN tag insertion itself,
852 * just pass the packet along. However, we need some way to
853 * tell the interface where the packet came from so that it
854 * knows how to find the VLAN tag to use, so we attach a
855 * packet tag that holds it.
856 */
857 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) {
858 m->m_pkthdr.ether_vtag = ifv->ifv_tag;
859 m->m_flags |= M_VLANTAG;
860 } else {
861 m = ether_vlanencap(m, ifv->ifv_tag);
862 if (m == NULL) {
863 if_printf(ifp,
864 "unable to prepend VLAN header\n");
865 ifp->if_oerrors++;
866 continue;
867 }
868 }
869
870 /*
871 * Send it, precisely as ether_output() would have.
872 * We are already running at splimp.
873 */
874 IFQ_HANDOFF(p, m, error);
875 if (!error)
876 ifp->if_opackets++;
877 else
878 ifp->if_oerrors++;
879 }
880 }
881
882 static void
883 vlan_input(struct ifnet *ifp, struct mbuf *m)
884 {
885 struct ifvlantrunk *trunk = ifp->if_vlantrunk;
886 struct ifvlan *ifv;
887 uint16_t tag;
888
889 KASSERT(trunk != NULL, ("%s: no trunk", __func__));
890
891 if (m->m_flags & M_VLANTAG) {
892 /*
893 * Packet is tagged, but m contains a normal
894 * Ethernet frame; the tag is stored out-of-band.
895 */
896 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag);
897 m->m_flags &= ~M_VLANTAG;
898 } else {
899 struct ether_vlan_header *evl;
900
901 /*
902 * Packet is tagged in-band as specified by 802.1q.
903 */
904 switch (ifp->if_type) {
905 case IFT_ETHER:
906 if (m->m_len < sizeof(*evl) &&
907 (m = m_pullup(m, sizeof(*evl))) == NULL) {
908 if_printf(ifp, "cannot pullup VLAN header\n");
909 return;
910 }
911 evl = mtod(m, struct ether_vlan_header *);
912 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag));
913
914 /*
915 * Remove the 802.1q header by copying the Ethernet
916 * addresses over it and adjusting the beginning of
917 * the data in the mbuf. The encapsulated Ethernet
918 * type field is already in place.
919 */
920 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
921 ETHER_HDR_LEN - ETHER_TYPE_LEN);
922 m_adj(m, ETHER_VLAN_ENCAP_LEN);
923 break;
924
925 default:
926 #ifdef INVARIANTS
927 panic("%s: %s has unsupported if_type %u",
928 __func__, ifp->if_xname, ifp->if_type);
929 #endif
930 m_freem(m);
931 ifp->if_noproto++;
932 return;
933 }
934 }
935
936 TRUNK_RLOCK(trunk);
937 #ifdef VLAN_ARRAY
938 ifv = trunk->vlans[tag];
939 #else
940 ifv = vlan_gethash(trunk, tag);
941 #endif
942 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) {
943 TRUNK_RUNLOCK(trunk);
944 m_freem(m);
945 ifp->if_noproto++;
946 return;
947 }
948 TRUNK_RUNLOCK(trunk);
949
950 m->m_pkthdr.rcvif = ifv->ifv_ifp;
951 ifv->ifv_ifp->if_ipackets++;
952
953 /* Pass it back through the parent's input routine. */
954 (*ifp->if_input)(ifv->ifv_ifp, m);
955 }
956
957 static int
958 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag)
959 {
960 struct ifvlantrunk *trunk;
961 struct ifnet *ifp;
962 int error = 0;
963
964 /* VID numbers 0x0 and 0xFFF are reserved */
965 if (tag == 0 || tag == 0xFFF)
966 return (EINVAL);
967 if (p->if_type != IFT_ETHER)
968 return (EPROTONOSUPPORT);
969 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS)
970 return (EPROTONOSUPPORT);
971 if (ifv->ifv_trunk)
972 return (EBUSY);
973
974 if (p->if_vlantrunk == NULL) {
975 trunk = malloc(sizeof(struct ifvlantrunk),
976 M_VLAN, M_WAITOK | M_ZERO);
977 #ifndef VLAN_ARRAY
978 vlan_inithash(trunk);
979 #endif
980 VLAN_LOCK();
981 if (p->if_vlantrunk != NULL) {
982 /* A race that that is very unlikely to be hit. */
983 #ifndef VLAN_ARRAY
984 vlan_freehash(trunk);
985 #endif
986 free(trunk, M_VLAN);
987 goto exists;
988 }
989 TRUNK_LOCK_INIT(trunk);
990 TRUNK_LOCK(trunk);
991 p->if_vlantrunk = trunk;
992 trunk->parent = p;
993 } else {
994 VLAN_LOCK();
995 exists:
996 trunk = p->if_vlantrunk;
997 TRUNK_LOCK(trunk);
998 }
999
1000 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */
1001 #ifdef VLAN_ARRAY
1002 if (trunk->vlans[tag] != NULL) {
1003 error = EEXIST;
1004 goto done;
1005 }
1006 trunk->vlans[tag] = ifv;
1007 trunk->refcnt++;
1008 #else
1009 error = vlan_inshash(trunk, ifv);
1010 if (error)
1011 goto done;
1012 #endif
1013 ifv->ifv_proto = ETHERTYPE_VLAN;
1014 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN;
1015 ifv->ifv_mintu = ETHERMIN;
1016 ifv->ifv_pflags = 0;
1017
1018 /*
1019 * If the parent supports the VLAN_MTU capability,
1020 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames,
1021 * use it.
1022 */
1023 if (p->if_capenable & IFCAP_VLAN_MTU) {
1024 /*
1025 * No need to fudge the MTU since the parent can
1026 * handle extended frames.
1027 */
1028 ifv->ifv_mtufudge = 0;
1029 } else {
1030 /*
1031 * Fudge the MTU by the encapsulation size. This
1032 * makes us incompatible with strictly compliant
1033 * 802.1Q implementations, but allows us to use
1034 * the feature with other NetBSD implementations,
1035 * which might still be useful.
1036 */
1037 ifv->ifv_mtufudge = ifv->ifv_encaplen;
1038 }
1039
1040 ifv->ifv_trunk = trunk;
1041 ifp = ifv->ifv_ifp;
1042 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge;
1043 ifp->if_baudrate = p->if_baudrate;
1044 /*
1045 * Copy only a selected subset of flags from the parent.
1046 * Other flags are none of our business.
1047 */
1048 #define VLAN_COPY_FLAGS (IFF_SIMPLEX)
1049 ifp->if_flags &= ~VLAN_COPY_FLAGS;
1050 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS;
1051 #undef VLAN_COPY_FLAGS
1052
1053 ifp->if_link_state = p->if_link_state;
1054
1055 vlan_capabilities(ifv);
1056
1057 /*
1058 * Set up our ``Ethernet address'' to reflect the underlying
1059 * physical interface's.
1060 */
1061 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN);
1062
1063 /*
1064 * Configure multicast addresses that may already be
1065 * joined on the vlan device.
1066 */
1067 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */
1068
1069 /* We are ready for operation now. */
1070 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1071 done:
1072 TRUNK_UNLOCK(trunk);
1073 if (error == 0)
1074 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag);
1075 VLAN_UNLOCK();
1076
1077 return (error);
1078 }
1079
1080 static void
1081 vlan_unconfig(struct ifnet *ifp)
1082 {
1083
1084 VLAN_LOCK();
1085 vlan_unconfig_locked(ifp);
1086 VLAN_UNLOCK();
1087 }
1088
1089 static void
1090 vlan_unconfig_locked(struct ifnet *ifp)
1091 {
1092 struct ifvlantrunk *trunk;
1093 struct vlan_mc_entry *mc;
1094 struct ifvlan *ifv;
1095 struct ifnet *parent;
1096
1097 VLAN_LOCK_ASSERT();
1098
1099 ifv = ifp->if_softc;
1100 trunk = ifv->ifv_trunk;
1101 parent = NULL;
1102
1103 if (trunk != NULL) {
1104 struct sockaddr_dl sdl;
1105
1106 TRUNK_LOCK(trunk);
1107 parent = trunk->parent;
1108
1109 /*
1110 * Since the interface is being unconfigured, we need to
1111 * empty the list of multicast groups that we may have joined
1112 * while we were alive from the parent's list.
1113 */
1114 bzero((char *)&sdl, sizeof(sdl));
1115 sdl.sdl_len = sizeof(sdl);
1116 sdl.sdl_family = AF_LINK;
1117 sdl.sdl_index = parent->if_index;
1118 sdl.sdl_type = IFT_ETHER;
1119 sdl.sdl_alen = ETHER_ADDR_LEN;
1120
1121 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) {
1122 bcopy((char *)&mc->mc_addr, LLADDR(&sdl),
1123 ETHER_ADDR_LEN);
1124
1125 /*
1126 * This may fail if the parent interface is
1127 * being detached. Regardless, we should do a
1128 * best effort to free this interface as much
1129 * as possible as all callers expect vlan
1130 * destruction to succeed.
1131 */
1132 (void)if_delmulti(parent, (struct sockaddr *)&sdl);
1133 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries);
1134 free(mc, M_VLAN);
1135 }
1136
1137 vlan_setflags(ifp, 0); /* clear special flags on parent */
1138 #ifdef VLAN_ARRAY
1139 trunk->vlans[ifv->ifv_tag] = NULL;
1140 trunk->refcnt--;
1141 #else
1142 vlan_remhash(trunk, ifv);
1143 #endif
1144 ifv->ifv_trunk = NULL;
1145
1146 /*
1147 * Check if we were the last.
1148 */
1149 if (trunk->refcnt == 0) {
1150 trunk->parent->if_vlantrunk = NULL;
1151 /*
1152 * XXXGL: If some ithread has already entered
1153 * vlan_input() and is now blocked on the trunk
1154 * lock, then it should preempt us right after
1155 * unlock and finish its work. Then we will acquire
1156 * lock again in trunk_destroy().
1157 */
1158 TRUNK_UNLOCK(trunk);
1159 trunk_destroy(trunk);
1160 } else
1161 TRUNK_UNLOCK(trunk);
1162 }
1163
1164 /* Disconnect from parent. */
1165 if (ifv->ifv_pflags)
1166 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__);
1167 ifp->if_mtu = ETHERMTU;
1168 ifp->if_link_state = LINK_STATE_UNKNOWN;
1169 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1170
1171 /*
1172 * Only dispatch an event if vlan was
1173 * attached, otherwise there is nothing
1174 * to cleanup anyway.
1175 */
1176 if (parent != NULL)
1177 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag);
1178 }
1179
1180 /* Handle a reference counted flag that should be set on the parent as well */
1181 static int
1182 vlan_setflag(struct ifnet *ifp, int flag, int status,
1183 int (*func)(struct ifnet *, int))
1184 {
1185 struct ifvlan *ifv;
1186 int error;
1187
1188 /* XXX VLAN_LOCK_ASSERT(); */
1189
1190 ifv = ifp->if_softc;
1191 status = status ? (ifp->if_flags & flag) : 0;
1192 /* Now "status" contains the flag value or 0 */
1193
1194 /*
1195 * See if recorded parent's status is different from what
1196 * we want it to be. If it is, flip it. We record parent's
1197 * status in ifv_pflags so that we won't clear parent's flag
1198 * we haven't set. In fact, we don't clear or set parent's
1199 * flags directly, but get or release references to them.
1200 * That's why we can be sure that recorded flags still are
1201 * in accord with actual parent's flags.
1202 */
1203 if (status != (ifv->ifv_pflags & flag)) {
1204 error = (*func)(PARENT(ifv), status);
1205 if (error)
1206 return (error);
1207 ifv->ifv_pflags &= ~flag;
1208 ifv->ifv_pflags |= status;
1209 }
1210 return (0);
1211 }
1212
1213 /*
1214 * Handle IFF_* flags that require certain changes on the parent:
1215 * if "status" is true, update parent's flags respective to our if_flags;
1216 * if "status" is false, forcedly clear the flags set on parent.
1217 */
1218 static int
1219 vlan_setflags(struct ifnet *ifp, int status)
1220 {
1221 int error, i;
1222
1223 for (i = 0; vlan_pflags[i].flag; i++) {
1224 error = vlan_setflag(ifp, vlan_pflags[i].flag,
1225 status, vlan_pflags[i].func);
1226 if (error)
1227 return (error);
1228 }
1229 return (0);
1230 }
1231
1232 /* Inform all vlans that their parent has changed link state */
1233 static void
1234 vlan_link_state(struct ifnet *ifp, int link)
1235 {
1236 struct ifvlantrunk *trunk = ifp->if_vlantrunk;
1237 struct ifvlan *ifv;
1238 int i;
1239
1240 TRUNK_LOCK(trunk);
1241 #ifdef VLAN_ARRAY
1242 for (i = 0; i < VLAN_ARRAY_SIZE; i++)
1243 if (trunk->vlans[i] != NULL) {
1244 ifv = trunk->vlans[i];
1245 #else
1246 for (i = 0; i < (1 << trunk->hwidth); i++)
1247 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) {
1248 #endif
1249 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate;
1250 if_link_state_change(ifv->ifv_ifp,
1251 trunk->parent->if_link_state);
1252 }
1253 TRUNK_UNLOCK(trunk);
1254 }
1255
1256 static void
1257 vlan_capabilities(struct ifvlan *ifv)
1258 {
1259 struct ifnet *p = PARENT(ifv);
1260 struct ifnet *ifp = ifv->ifv_ifp;
1261
1262 TRUNK_LOCK_ASSERT(TRUNK(ifv));
1263
1264 /*
1265 * If the parent interface can do checksum offloading
1266 * on VLANs, then propagate its hardware-assisted
1267 * checksumming flags. Also assert that checksum
1268 * offloading requires hardware VLAN tagging.
1269 */
1270 if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
1271 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM;
1272
1273 if (p->if_capenable & IFCAP_VLAN_HWCSUM &&
1274 p->if_capenable & IFCAP_VLAN_HWTAGGING) {
1275 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM;
1276 ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP |
1277 CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT);
1278 } else {
1279 ifp->if_capenable = 0;
1280 ifp->if_hwassist = 0;
1281 }
1282 /*
1283 * If the parent interface can do TSO on VLANs then
1284 * propagate the hardware-assisted flag. TSO on VLANs
1285 * does not necessarily require hardware VLAN tagging.
1286 */
1287 if (p->if_capabilities & IFCAP_VLAN_HWTSO)
1288 ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO;
1289 if (p->if_capenable & IFCAP_VLAN_HWTSO) {
1290 ifp->if_capenable |= p->if_capenable & IFCAP_TSO;
1291 ifp->if_hwassist |= p->if_hwassist & CSUM_TSO;
1292 } else {
1293 ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO);
1294 ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO);
1295 }
1296 }
1297
1298 static void
1299 vlan_trunk_capabilities(struct ifnet *ifp)
1300 {
1301 struct ifvlantrunk *trunk = ifp->if_vlantrunk;
1302 struct ifvlan *ifv;
1303 int i;
1304
1305 TRUNK_LOCK(trunk);
1306 #ifdef VLAN_ARRAY
1307 for (i = 0; i < VLAN_ARRAY_SIZE; i++)
1308 if (trunk->vlans[i] != NULL) {
1309 ifv = trunk->vlans[i];
1310 #else
1311 for (i = 0; i < (1 << trunk->hwidth); i++) {
1312 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
1313 #endif
1314 vlan_capabilities(ifv);
1315 }
1316 TRUNK_UNLOCK(trunk);
1317 }
1318
1319 static int
1320 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1321 {
1322 struct ifnet *p;
1323 struct ifreq *ifr;
1324 struct ifvlan *ifv;
1325 struct vlanreq vlr;
1326 int error = 0;
1327
1328 ifr = (struct ifreq *)data;
1329 ifv = ifp->if_softc;
1330
1331 switch (cmd) {
1332 case SIOCGIFMEDIA:
1333 VLAN_LOCK();
1334 if (TRUNK(ifv) != NULL) {
1335 p = PARENT(ifv);
1336 VLAN_UNLOCK();
1337 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data);
1338 /* Limit the result to the parent's current config. */
1339 if (error == 0) {
1340 struct ifmediareq *ifmr;
1341
1342 ifmr = (struct ifmediareq *)data;
1343 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) {
1344 ifmr->ifm_count = 1;
1345 error = copyout(&ifmr->ifm_current,
1346 ifmr->ifm_ulist,
1347 sizeof(int));
1348 }
1349 }
1350 } else {
1351 VLAN_UNLOCK();
1352 error = EINVAL;
1353 }
1354 break;
1355
1356 case SIOCSIFMEDIA:
1357 error = EINVAL;
1358 break;
1359
1360 case SIOCSIFMTU:
1361 /*
1362 * Set the interface MTU.
1363 */
1364 VLAN_LOCK();
1365 if (TRUNK(ifv) != NULL) {
1366 if (ifr->ifr_mtu >
1367 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) ||
1368 ifr->ifr_mtu <
1369 (ifv->ifv_mintu - ifv->ifv_mtufudge))
1370 error = EINVAL;
1371 else
1372 ifp->if_mtu = ifr->ifr_mtu;
1373 } else
1374 error = EINVAL;
1375 VLAN_UNLOCK();
1376 break;
1377
1378 case SIOCSETVLAN:
1379 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr));
1380 if (error)
1381 break;
1382 if (vlr.vlr_parent[0] == '\0') {
1383 vlan_unconfig(ifp);
1384 break;
1385 }
1386 p = ifunit(vlr.vlr_parent);
1387 if (p == 0) {
1388 error = ENOENT;
1389 break;
1390 }
1391 /*
1392 * Don't let the caller set up a VLAN tag with
1393 * anything except VLID bits.
1394 */
1395 if (vlr.vlr_tag & ~EVL_VLID_MASK) {
1396 error = EINVAL;
1397 break;
1398 }
1399 error = vlan_config(ifv, p, vlr.vlr_tag);
1400 if (error)
1401 break;
1402
1403 /* Update flags on the parent, if necessary. */
1404 vlan_setflags(ifp, 1);
1405 break;
1406
1407 case SIOCGETVLAN:
1408 bzero(&vlr, sizeof(vlr));
1409 VLAN_LOCK();
1410 if (TRUNK(ifv) != NULL) {
1411 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname,
1412 sizeof(vlr.vlr_parent));
1413 vlr.vlr_tag = ifv->ifv_tag;
1414 }
1415 VLAN_UNLOCK();
1416 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr));
1417 break;
1418
1419 case SIOCSIFFLAGS:
1420 /*
1421 * We should propagate selected flags to the parent,
1422 * e.g., promiscuous mode.
1423 */
1424 if (TRUNK(ifv) != NULL)
1425 error = vlan_setflags(ifp, 1);
1426 break;
1427
1428 case SIOCADDMULTI:
1429 case SIOCDELMULTI:
1430 /*
1431 * If we don't have a parent, just remember the membership for
1432 * when we do.
1433 */
1434 if (TRUNK(ifv) != NULL)
1435 error = vlan_setmulti(ifp);
1436 break;
1437
1438 default:
1439 error = ether_ioctl(ifp, cmd, data);
1440 }
1441
1442 return (error);
1443 }
Cache object: becad9acc0e0f2a2dc3d0661636ebedd
|