1 /*-
2 * Copyright 1998 Massachusetts Institute of Technology
3 * Copyright 2012 ADARA Networks, Inc.
4 * Copyright 2017 Dell EMC Isilon
5 *
6 * Portions of this software were developed by Robert N. M. Watson under
7 * contract to ADARA Networks, Inc.
8 *
9 * Permission to use, copy, modify, and distribute this software and
10 * its documentation for any purpose and without fee is hereby
11 * granted, provided that both the above copyright notice and this
12 * permission notice appear in all copies, that both the above
13 * copyright notice and this permission notice appear in all
14 * supporting documentation, and that the name of M.I.T. not be used
15 * in advertising or publicity pertaining to distribution of the
16 * software without specific, written prior permission. M.I.T. makes
17 * no representations about the suitability of this software for any
18 * purpose. It is provided "as is" without express or implied
19 * warranty.
20 *
21 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
22 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
23 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
25 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
29 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 /*
36 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs.
37 * This is sort of sneaky in the implementation, since
38 * we need to pretend to be enough of an Ethernet implementation
39 * to make arp work. The way we do this is by telling everyone
40 * that we are an Ethernet, and then catch the packets that
41 * ether_output() sends to us via if_transmit(), rewrite them for
42 * use by the real outgoing interface, and ask it to send them.
43 */
44
45 #include <sys/cdefs.h>
46 #include "opt_inet.h"
47 #include "opt_inet6.h"
48 #include "opt_kern_tls.h"
49 #include "opt_vlan.h"
50 #include "opt_ratelimit.h"
51
52 #include <sys/param.h>
53 #include <sys/eventhandler.h>
54 #include <sys/kernel.h>
55 #include <sys/lock.h>
56 #include <sys/malloc.h>
57 #include <sys/mbuf.h>
58 #include <sys/module.h>
59 #include <sys/rmlock.h>
60 #include <sys/priv.h>
61 #include <sys/queue.h>
62 #include <sys/socket.h>
63 #include <sys/sockio.h>
64 #include <sys/sysctl.h>
65 #include <sys/systm.h>
66 #include <sys/sx.h>
67 #include <sys/taskqueue.h>
68
69 #include <net/bpf.h>
70 #include <net/ethernet.h>
71 #include <net/if.h>
72 #include <net/if_var.h>
73 #include <net/if_private.h>
74 #include <net/if_clone.h>
75 #include <net/if_dl.h>
76 #include <net/if_types.h>
77 #include <net/if_vlan_var.h>
78 #include <net/route.h>
79 #include <net/vnet.h>
80
81 #ifdef INET
82 #include <netinet/in.h>
83 #include <netinet/if_ether.h>
84 #endif
85
86 #include <netlink/netlink.h>
87 #include <netlink/netlink_ctl.h>
88 #include <netlink/netlink_route.h>
89 #include <netlink/route/route_var.h>
90
91 #define VLAN_DEF_HWIDTH 4
92 #define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST)
93
94 #define UP_AND_RUNNING(ifp) \
95 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING)
96
97 CK_SLIST_HEAD(ifvlanhead, ifvlan);
98
99 struct ifvlantrunk {
100 struct ifnet *parent; /* parent interface of this trunk */
101 struct mtx lock;
102 #ifdef VLAN_ARRAY
103 #define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1)
104 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */
105 #else
106 struct ifvlanhead *hash; /* dynamic hash-list table */
107 uint16_t hmask;
108 uint16_t hwidth;
109 #endif
110 int refcnt;
111 };
112
113 #if defined(KERN_TLS) || defined(RATELIMIT)
114 struct vlan_snd_tag {
115 struct m_snd_tag com;
116 struct m_snd_tag *tag;
117 };
118
119 static inline struct vlan_snd_tag *
mst_to_vst(struct m_snd_tag * mst)120 mst_to_vst(struct m_snd_tag *mst)
121 {
122
123 return (__containerof(mst, struct vlan_snd_tag, com));
124 }
125 #endif
126
127 /*
128 * This macro provides a facility to iterate over every vlan on a trunk with
129 * the assumption that none will be added/removed during iteration.
130 */
131 #ifdef VLAN_ARRAY
132 #define VLAN_FOREACH(_ifv, _trunk) \
133 size_t _i; \
134 for (_i = 0; _i < VLAN_ARRAY_SIZE; _i++) \
135 if (((_ifv) = (_trunk)->vlans[_i]) != NULL)
136 #else /* VLAN_ARRAY */
137 #define VLAN_FOREACH(_ifv, _trunk) \
138 struct ifvlan *_next; \
139 size_t _i; \
140 for (_i = 0; _i < (1 << (_trunk)->hwidth); _i++) \
141 CK_SLIST_FOREACH_SAFE((_ifv), &(_trunk)->hash[_i], ifv_list, _next)
142 #endif /* VLAN_ARRAY */
143
144 /*
145 * This macro provides a facility to iterate over every vlan on a trunk while
146 * also modifying the number of vlans on the trunk. The iteration continues
147 * until some condition is met or there are no more vlans on the trunk.
148 */
149 #ifdef VLAN_ARRAY
150 /* The VLAN_ARRAY case is simple -- just a for loop using the condition. */
151 #define VLAN_FOREACH_UNTIL_SAFE(_ifv, _trunk, _cond) \
152 size_t _i; \
153 for (_i = 0; !(_cond) && _i < VLAN_ARRAY_SIZE; _i++) \
154 if (((_ifv) = (_trunk)->vlans[_i]))
155 #else /* VLAN_ARRAY */
156 /*
157 * The hash table case is more complicated. We allow for the hash table to be
158 * modified (i.e. vlans removed) while we are iterating over it. To allow for
159 * this we must restart the iteration every time we "touch" something during
160 * the iteration, since removal will resize the hash table and invalidate our
161 * current position. If acting on the touched element causes the trunk to be
162 * emptied, then iteration also stops.
163 */
164 #define VLAN_FOREACH_UNTIL_SAFE(_ifv, _trunk, _cond) \
165 size_t _i; \
166 bool _touch = false; \
167 for (_i = 0; \
168 !(_cond) && _i < (1 << (_trunk)->hwidth); \
169 _i = (_touch && ((_trunk) != NULL) ? 0 : _i + 1), _touch = false) \
170 if (((_ifv) = CK_SLIST_FIRST(&(_trunk)->hash[_i])) != NULL && \
171 (_touch = true))
172 #endif /* VLAN_ARRAY */
173
174 struct vlan_mc_entry {
175 struct sockaddr_dl mc_addr;
176 CK_SLIST_ENTRY(vlan_mc_entry) mc_entries;
177 struct epoch_context mc_epoch_ctx;
178 };
179
180 struct ifvlan {
181 struct ifvlantrunk *ifv_trunk;
182 struct ifnet *ifv_ifp;
183 #define TRUNK(ifv) ((ifv)->ifv_trunk)
184 #define PARENT(ifv) (TRUNK(ifv)->parent)
185 void *ifv_cookie;
186 int ifv_pflags; /* special flags we have set on parent */
187 int ifv_capenable;
188 int ifv_encaplen; /* encapsulation length */
189 int ifv_mtufudge; /* MTU fudged by this much */
190 int ifv_mintu; /* min transmission unit */
191 struct ether_8021q_tag ifv_qtag;
192 #define ifv_proto ifv_qtag.proto
193 #define ifv_vid ifv_qtag.vid
194 #define ifv_pcp ifv_qtag.pcp
195 struct task lladdr_task;
196 CK_SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead;
197 #ifndef VLAN_ARRAY
198 CK_SLIST_ENTRY(ifvlan) ifv_list;
199 #endif
200 };
201
202 /* Special flags we should propagate to parent. */
203 static struct {
204 int flag;
205 int (*func)(struct ifnet *, int);
206 } vlan_pflags[] = {
207 {IFF_PROMISC, ifpromisc},
208 {IFF_ALLMULTI, if_allmulti},
209 {0, NULL}
210 };
211
212 VNET_DECLARE(int, vlan_mtag_pcp);
213 #define V_vlan_mtag_pcp VNET(vlan_mtag_pcp)
214
215 static const char vlanname[] = "vlan";
216 static MALLOC_DEFINE(M_VLAN, vlanname, "802.1Q Virtual LAN Interface");
217
218 static eventhandler_tag ifdetach_tag;
219 static eventhandler_tag iflladdr_tag;
220 static eventhandler_tag ifevent_tag;
221
222 /*
223 * if_vlan uses two module-level synchronizations primitives to allow concurrent
224 * modification of vlan interfaces and (mostly) allow for vlans to be destroyed
225 * while they are being used for tx/rx. To accomplish this in a way that has
226 * acceptable performance and cooperation with other parts of the network stack
227 * there is a non-sleepable epoch(9) and an sx(9).
228 *
229 * The performance-sensitive paths that warrant using the epoch(9) are
230 * vlan_transmit and vlan_input. Both have to check for the vlan interface's
231 * existence using if_vlantrunk, and being in the network tx/rx paths the use
232 * of an epoch(9) gives a measureable improvement in performance.
233 *
234 * The reason for having an sx(9) is mostly because there are still areas that
235 * must be sleepable and also have safe concurrent access to a vlan interface.
236 * Since the sx(9) exists, it is used by default in most paths unless sleeping
237 * is not permitted, or if it is not clear whether sleeping is permitted.
238 *
239 */
240 #define _VLAN_SX_ID ifv_sx
241
242 static struct sx _VLAN_SX_ID;
243
244 #define VLAN_LOCKING_INIT() \
245 sx_init_flags(&_VLAN_SX_ID, "vlan_sx", SX_RECURSE)
246
247 #define VLAN_LOCKING_DESTROY() \
248 sx_destroy(&_VLAN_SX_ID)
249
250 #define VLAN_SLOCK() sx_slock(&_VLAN_SX_ID)
251 #define VLAN_SUNLOCK() sx_sunlock(&_VLAN_SX_ID)
252 #define VLAN_XLOCK() sx_xlock(&_VLAN_SX_ID)
253 #define VLAN_XUNLOCK() sx_xunlock(&_VLAN_SX_ID)
254 #define VLAN_SLOCK_ASSERT() sx_assert(&_VLAN_SX_ID, SA_SLOCKED)
255 #define VLAN_XLOCK_ASSERT() sx_assert(&_VLAN_SX_ID, SA_XLOCKED)
256 #define VLAN_SXLOCK_ASSERT() sx_assert(&_VLAN_SX_ID, SA_LOCKED)
257
258 /*
259 * We also have a per-trunk mutex that should be acquired when changing
260 * its state.
261 */
262 #define TRUNK_LOCK_INIT(trunk) mtx_init(&(trunk)->lock, vlanname, NULL, MTX_DEF)
263 #define TRUNK_LOCK_DESTROY(trunk) mtx_destroy(&(trunk)->lock)
264 #define TRUNK_WLOCK(trunk) mtx_lock(&(trunk)->lock)
265 #define TRUNK_WUNLOCK(trunk) mtx_unlock(&(trunk)->lock)
266 #define TRUNK_WLOCK_ASSERT(trunk) mtx_assert(&(trunk)->lock, MA_OWNED);
267
268 /*
269 * The VLAN_ARRAY substitutes the dynamic hash with a static array
270 * with 4096 entries. In theory this can give a boost in processing,
271 * however in practice it does not. Probably this is because the array
272 * is too big to fit into CPU cache.
273 */
274 #ifndef VLAN_ARRAY
275 static void vlan_inithash(struct ifvlantrunk *trunk);
276 static void vlan_freehash(struct ifvlantrunk *trunk);
277 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
278 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
279 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch);
280 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk,
281 uint16_t vid);
282 #endif
283 static void trunk_destroy(struct ifvlantrunk *trunk);
284
285 static void vlan_init(void *foo);
286 static void vlan_input(struct ifnet *ifp, struct mbuf *m);
287 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr);
288 #if defined(KERN_TLS) || defined(RATELIMIT)
289 static int vlan_snd_tag_alloc(struct ifnet *,
290 union if_snd_tag_alloc_params *, struct m_snd_tag **);
291 static int vlan_snd_tag_modify(struct m_snd_tag *,
292 union if_snd_tag_modify_params *);
293 static int vlan_snd_tag_query(struct m_snd_tag *,
294 union if_snd_tag_query_params *);
295 static void vlan_snd_tag_free(struct m_snd_tag *);
296 static struct m_snd_tag *vlan_next_snd_tag(struct m_snd_tag *);
297 static void vlan_ratelimit_query(struct ifnet *,
298 struct if_ratelimit_query_results *);
299 #endif
300 static void vlan_qflush(struct ifnet *ifp);
301 static int vlan_setflag(struct ifnet *ifp, int flag, int status,
302 int (*func)(struct ifnet *, int));
303 static int vlan_setflags(struct ifnet *ifp, int status);
304 static int vlan_setmulti(struct ifnet *ifp);
305 static int vlan_transmit(struct ifnet *ifp, struct mbuf *m);
306 #ifdef ALTQ
307 static void vlan_altq_start(struct ifnet *ifp);
308 static int vlan_altq_transmit(struct ifnet *ifp, struct mbuf *m);
309 #endif
310 static int vlan_output(struct ifnet *ifp, struct mbuf *m,
311 const struct sockaddr *dst, struct route *ro);
312 static void vlan_unconfig(struct ifnet *ifp);
313 static void vlan_unconfig_locked(struct ifnet *ifp, int departing);
314 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag,
315 uint16_t proto);
316 static void vlan_link_state(struct ifnet *ifp);
317 static void vlan_capabilities(struct ifvlan *ifv);
318 static void vlan_trunk_capabilities(struct ifnet *ifp);
319
320 static struct ifnet *vlan_clone_match_ethervid(const char *, int *);
321 static int vlan_clone_match(struct if_clone *, const char *);
322 static int vlan_clone_create(struct if_clone *, char *, size_t,
323 struct ifc_data *, struct ifnet **);
324 static int vlan_clone_destroy(struct if_clone *, struct ifnet *, uint32_t);
325
326 static int vlan_clone_create_nl(struct if_clone *ifc, char *name, size_t len,
327 struct ifc_data_nl *ifd);
328 static int vlan_clone_modify_nl(struct ifnet *ifp, struct ifc_data_nl *ifd);
329 static void vlan_clone_dump_nl(struct ifnet *ifp, struct nl_writer *nw);
330
331 static void vlan_ifdetach(void *arg, struct ifnet *ifp);
332 static void vlan_iflladdr(void *arg, struct ifnet *ifp);
333 static void vlan_ifevent(void *arg, struct ifnet *ifp, int event);
334
335 static void vlan_lladdr_fn(void *arg, int pending);
336
337 static struct if_clone *vlan_cloner;
338
339 #ifdef VIMAGE
340 VNET_DEFINE_STATIC(struct if_clone *, vlan_cloner);
341 #define V_vlan_cloner VNET(vlan_cloner)
342 #endif
343
344 #ifdef RATELIMIT
345 static const struct if_snd_tag_sw vlan_snd_tag_ul_sw = {
346 .snd_tag_modify = vlan_snd_tag_modify,
347 .snd_tag_query = vlan_snd_tag_query,
348 .snd_tag_free = vlan_snd_tag_free,
349 .next_snd_tag = vlan_next_snd_tag,
350 .type = IF_SND_TAG_TYPE_UNLIMITED
351 };
352
353 static const struct if_snd_tag_sw vlan_snd_tag_rl_sw = {
354 .snd_tag_modify = vlan_snd_tag_modify,
355 .snd_tag_query = vlan_snd_tag_query,
356 .snd_tag_free = vlan_snd_tag_free,
357 .next_snd_tag = vlan_next_snd_tag,
358 .type = IF_SND_TAG_TYPE_RATE_LIMIT
359 };
360 #endif
361
362 #ifdef KERN_TLS
363 static const struct if_snd_tag_sw vlan_snd_tag_tls_sw = {
364 .snd_tag_modify = vlan_snd_tag_modify,
365 .snd_tag_query = vlan_snd_tag_query,
366 .snd_tag_free = vlan_snd_tag_free,
367 .next_snd_tag = vlan_next_snd_tag,
368 .type = IF_SND_TAG_TYPE_TLS
369 };
370
371 #ifdef RATELIMIT
372 static const struct if_snd_tag_sw vlan_snd_tag_tls_rl_sw = {
373 .snd_tag_modify = vlan_snd_tag_modify,
374 .snd_tag_query = vlan_snd_tag_query,
375 .snd_tag_free = vlan_snd_tag_free,
376 .next_snd_tag = vlan_next_snd_tag,
377 .type = IF_SND_TAG_TYPE_TLS_RATE_LIMIT
378 };
379 #endif
380 #endif
381
382 static void
vlan_mc_free(struct epoch_context * ctx)383 vlan_mc_free(struct epoch_context *ctx)
384 {
385 struct vlan_mc_entry *mc = __containerof(ctx, struct vlan_mc_entry, mc_epoch_ctx);
386 free(mc, M_VLAN);
387 }
388
389 #ifndef VLAN_ARRAY
390 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m))
391
392 static void
vlan_inithash(struct ifvlantrunk * trunk)393 vlan_inithash(struct ifvlantrunk *trunk)
394 {
395 int i, n;
396
397 /*
398 * The trunk must not be locked here since we call malloc(M_WAITOK).
399 * It is OK in case this function is called before the trunk struct
400 * gets hooked up and becomes visible from other threads.
401 */
402
403 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL,
404 ("%s: hash already initialized", __func__));
405
406 trunk->hwidth = VLAN_DEF_HWIDTH;
407 n = 1 << trunk->hwidth;
408 trunk->hmask = n - 1;
409 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK);
410 for (i = 0; i < n; i++)
411 CK_SLIST_INIT(&trunk->hash[i]);
412 }
413
414 static void
vlan_freehash(struct ifvlantrunk * trunk)415 vlan_freehash(struct ifvlantrunk *trunk)
416 {
417 #ifdef INVARIANTS
418 int i;
419
420 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
421 for (i = 0; i < (1 << trunk->hwidth); i++)
422 KASSERT(CK_SLIST_EMPTY(&trunk->hash[i]),
423 ("%s: hash table not empty", __func__));
424 #endif
425 free(trunk->hash, M_VLAN);
426 trunk->hash = NULL;
427 trunk->hwidth = trunk->hmask = 0;
428 }
429
430 static int
vlan_inshash(struct ifvlantrunk * trunk,struct ifvlan * ifv)431 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
432 {
433 int i, b;
434 struct ifvlan *ifv2;
435
436 VLAN_XLOCK_ASSERT();
437 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
438
439 b = 1 << trunk->hwidth;
440 i = HASH(ifv->ifv_vid, trunk->hmask);
441 CK_SLIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
442 if (ifv->ifv_vid == ifv2->ifv_vid)
443 return (EEXIST);
444
445 /*
446 * Grow the hash when the number of vlans exceeds half of the number of
447 * hash buckets squared. This will make the average linked-list length
448 * buckets/2.
449 */
450 if (trunk->refcnt > (b * b) / 2) {
451 vlan_growhash(trunk, 1);
452 i = HASH(ifv->ifv_vid, trunk->hmask);
453 }
454 CK_SLIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list);
455 trunk->refcnt++;
456
457 return (0);
458 }
459
460 static int
vlan_remhash(struct ifvlantrunk * trunk,struct ifvlan * ifv)461 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
462 {
463 int i, b;
464 struct ifvlan *ifv2;
465
466 VLAN_XLOCK_ASSERT();
467 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
468
469 b = 1 << (trunk->hwidth - 1);
470 i = HASH(ifv->ifv_vid, trunk->hmask);
471 CK_SLIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
472 if (ifv2 == ifv) {
473 trunk->refcnt--;
474 CK_SLIST_REMOVE(&trunk->hash[i], ifv2, ifvlan, ifv_list);
475 if (trunk->refcnt < (b * b) / 2)
476 vlan_growhash(trunk, -1);
477 return (0);
478 }
479
480 panic("%s: vlan not found\n", __func__);
481 return (ENOENT); /*NOTREACHED*/
482 }
483
484 /*
485 * Grow the hash larger or smaller if memory permits.
486 */
487 static void
vlan_growhash(struct ifvlantrunk * trunk,int howmuch)488 vlan_growhash(struct ifvlantrunk *trunk, int howmuch)
489 {
490 struct ifvlan *ifv;
491 struct ifvlanhead *hash2;
492 int hwidth2, i, j, n, n2;
493
494 VLAN_XLOCK_ASSERT();
495 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
496
497 if (howmuch == 0) {
498 /* Harmless yet obvious coding error */
499 printf("%s: howmuch is 0\n", __func__);
500 return;
501 }
502
503 hwidth2 = trunk->hwidth + howmuch;
504 n = 1 << trunk->hwidth;
505 n2 = 1 << hwidth2;
506 /* Do not shrink the table below the default */
507 if (hwidth2 < VLAN_DEF_HWIDTH)
508 return;
509
510 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_WAITOK);
511 if (hash2 == NULL) {
512 printf("%s: out of memory -- hash size not changed\n",
513 __func__);
514 return; /* We can live with the old hash table */
515 }
516 for (j = 0; j < n2; j++)
517 CK_SLIST_INIT(&hash2[j]);
518 for (i = 0; i < n; i++)
519 while ((ifv = CK_SLIST_FIRST(&trunk->hash[i])) != NULL) {
520 CK_SLIST_REMOVE(&trunk->hash[i], ifv, ifvlan, ifv_list);
521 j = HASH(ifv->ifv_vid, n2 - 1);
522 CK_SLIST_INSERT_HEAD(&hash2[j], ifv, ifv_list);
523 }
524 NET_EPOCH_WAIT();
525 free(trunk->hash, M_VLAN);
526 trunk->hash = hash2;
527 trunk->hwidth = hwidth2;
528 trunk->hmask = n2 - 1;
529
530 if (bootverbose)
531 if_printf(trunk->parent,
532 "VLAN hash table resized from %d to %d buckets\n", n, n2);
533 }
534
535 static __inline struct ifvlan *
vlan_gethash(struct ifvlantrunk * trunk,uint16_t vid)536 vlan_gethash(struct ifvlantrunk *trunk, uint16_t vid)
537 {
538 struct ifvlan *ifv;
539
540 NET_EPOCH_ASSERT();
541
542 CK_SLIST_FOREACH(ifv, &trunk->hash[HASH(vid, trunk->hmask)], ifv_list)
543 if (ifv->ifv_vid == vid)
544 return (ifv);
545 return (NULL);
546 }
547
548 #if 0
549 /* Debugging code to view the hashtables. */
550 static void
551 vlan_dumphash(struct ifvlantrunk *trunk)
552 {
553 int i;
554 struct ifvlan *ifv;
555
556 for (i = 0; i < (1 << trunk->hwidth); i++) {
557 printf("%d: ", i);
558 CK_SLIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
559 printf("%s ", ifv->ifv_ifp->if_xname);
560 printf("\n");
561 }
562 }
563 #endif /* 0 */
564 #else
565
566 static __inline struct ifvlan *
vlan_gethash(struct ifvlantrunk * trunk,uint16_t vid)567 vlan_gethash(struct ifvlantrunk *trunk, uint16_t vid)
568 {
569
570 return trunk->vlans[vid];
571 }
572
573 static __inline int
vlan_inshash(struct ifvlantrunk * trunk,struct ifvlan * ifv)574 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
575 {
576
577 if (trunk->vlans[ifv->ifv_vid] != NULL)
578 return EEXIST;
579 trunk->vlans[ifv->ifv_vid] = ifv;
580 trunk->refcnt++;
581
582 return (0);
583 }
584
585 static __inline int
vlan_remhash(struct ifvlantrunk * trunk,struct ifvlan * ifv)586 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
587 {
588
589 trunk->vlans[ifv->ifv_vid] = NULL;
590 trunk->refcnt--;
591
592 return (0);
593 }
594
595 static __inline void
vlan_freehash(struct ifvlantrunk * trunk)596 vlan_freehash(struct ifvlantrunk *trunk)
597 {
598 }
599
600 static __inline void
vlan_inithash(struct ifvlantrunk * trunk)601 vlan_inithash(struct ifvlantrunk *trunk)
602 {
603 }
604
605 #endif /* !VLAN_ARRAY */
606
607 static void
trunk_destroy(struct ifvlantrunk * trunk)608 trunk_destroy(struct ifvlantrunk *trunk)
609 {
610 VLAN_XLOCK_ASSERT();
611
612 vlan_freehash(trunk);
613 trunk->parent->if_vlantrunk = NULL;
614 TRUNK_LOCK_DESTROY(trunk);
615 if_rele(trunk->parent);
616 free(trunk, M_VLAN);
617 }
618
619 /*
620 * Program our multicast filter. What we're actually doing is
621 * programming the multicast filter of the parent. This has the
622 * side effect of causing the parent interface to receive multicast
623 * traffic that it doesn't really want, which ends up being discarded
624 * later by the upper protocol layers. Unfortunately, there's no way
625 * to avoid this: there really is only one physical interface.
626 */
627 static int
vlan_setmulti(struct ifnet * ifp)628 vlan_setmulti(struct ifnet *ifp)
629 {
630 struct ifnet *ifp_p;
631 struct ifmultiaddr *ifma;
632 struct ifvlan *sc;
633 struct vlan_mc_entry *mc;
634 int error;
635
636 VLAN_XLOCK_ASSERT();
637
638 /* Find the parent. */
639 sc = ifp->if_softc;
640 ifp_p = PARENT(sc);
641
642 CURVNET_SET_QUIET(ifp_p->if_vnet);
643
644 /* First, remove any existing filter entries. */
645 while ((mc = CK_SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) {
646 CK_SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries);
647 (void)if_delmulti(ifp_p, (struct sockaddr *)&mc->mc_addr);
648 NET_EPOCH_CALL(vlan_mc_free, &mc->mc_epoch_ctx);
649 }
650
651 /* Now program new ones. */
652 IF_ADDR_WLOCK(ifp);
653 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
654 if (ifma->ifma_addr->sa_family != AF_LINK)
655 continue;
656 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT);
657 if (mc == NULL) {
658 IF_ADDR_WUNLOCK(ifp);
659 CURVNET_RESTORE();
660 return (ENOMEM);
661 }
662 bcopy(ifma->ifma_addr, &mc->mc_addr, ifma->ifma_addr->sa_len);
663 mc->mc_addr.sdl_index = ifp_p->if_index;
664 CK_SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries);
665 }
666 IF_ADDR_WUNLOCK(ifp);
667 CK_SLIST_FOREACH (mc, &sc->vlan_mc_listhead, mc_entries) {
668 error = if_addmulti(ifp_p, (struct sockaddr *)&mc->mc_addr,
669 NULL);
670 if (error) {
671 CURVNET_RESTORE();
672 return (error);
673 }
674 }
675
676 CURVNET_RESTORE();
677 return (0);
678 }
679
680 /*
681 * A handler for interface ifnet events.
682 */
683 static void
vlan_ifevent(void * arg __unused,struct ifnet * ifp,int event)684 vlan_ifevent(void *arg __unused, struct ifnet *ifp, int event)
685 {
686 struct epoch_tracker et;
687 struct ifvlan *ifv;
688 struct ifvlantrunk *trunk;
689
690 if (event != IFNET_EVENT_UPDATE_BAUDRATE)
691 return;
692
693 NET_EPOCH_ENTER(et);
694 trunk = ifp->if_vlantrunk;
695 if (trunk == NULL) {
696 NET_EPOCH_EXIT(et);
697 return;
698 }
699
700 TRUNK_WLOCK(trunk);
701 VLAN_FOREACH(ifv, trunk) {
702 ifv->ifv_ifp->if_baudrate = ifp->if_baudrate;
703 }
704 TRUNK_WUNLOCK(trunk);
705 NET_EPOCH_EXIT(et);
706 }
707
708 /*
709 * A handler for parent interface link layer address changes.
710 * If the parent interface link layer address is changed we
711 * should also change it on all children vlans.
712 */
713 static void
vlan_iflladdr(void * arg __unused,struct ifnet * ifp)714 vlan_iflladdr(void *arg __unused, struct ifnet *ifp)
715 {
716 struct epoch_tracker et;
717 struct ifvlan *ifv;
718 struct ifnet *ifv_ifp;
719 struct ifvlantrunk *trunk;
720 struct sockaddr_dl *sdl;
721
722 /* Need the epoch since this is run on taskqueue_swi. */
723 NET_EPOCH_ENTER(et);
724 trunk = ifp->if_vlantrunk;
725 if (trunk == NULL) {
726 NET_EPOCH_EXIT(et);
727 return;
728 }
729
730 /*
731 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it.
732 * We need an exclusive lock here to prevent concurrent SIOCSIFLLADDR
733 * ioctl calls on the parent garbling the lladdr of the child vlan.
734 */
735 TRUNK_WLOCK(trunk);
736 VLAN_FOREACH(ifv, trunk) {
737 /*
738 * Copy new new lladdr into the ifv_ifp, enqueue a task
739 * to actually call if_setlladdr. if_setlladdr needs to
740 * be deferred to a taskqueue because it will call into
741 * the if_vlan ioctl path and try to acquire the global
742 * lock.
743 */
744 ifv_ifp = ifv->ifv_ifp;
745 bcopy(IF_LLADDR(ifp), IF_LLADDR(ifv_ifp),
746 ifp->if_addrlen);
747 sdl = (struct sockaddr_dl *)ifv_ifp->if_addr->ifa_addr;
748 sdl->sdl_alen = ifp->if_addrlen;
749 taskqueue_enqueue(taskqueue_thread, &ifv->lladdr_task);
750 }
751 TRUNK_WUNLOCK(trunk);
752 NET_EPOCH_EXIT(et);
753 }
754
755 /*
756 * A handler for network interface departure events.
757 * Track departure of trunks here so that we don't access invalid
758 * pointers or whatever if a trunk is ripped from under us, e.g.,
759 * by ejecting its hot-plug card. However, if an ifnet is simply
760 * being renamed, then there's no need to tear down the state.
761 */
762 static void
vlan_ifdetach(void * arg __unused,struct ifnet * ifp)763 vlan_ifdetach(void *arg __unused, struct ifnet *ifp)
764 {
765 struct ifvlan *ifv;
766 struct ifvlantrunk *trunk;
767
768 /* If the ifnet is just being renamed, don't do anything. */
769 if (ifp->if_flags & IFF_RENAMING)
770 return;
771 VLAN_XLOCK();
772 trunk = ifp->if_vlantrunk;
773 if (trunk == NULL) {
774 VLAN_XUNLOCK();
775 return;
776 }
777
778 /*
779 * OK, it's a trunk. Loop over and detach all vlan's on it.
780 * Check trunk pointer after each vlan_unconfig() as it will
781 * free it and set to NULL after the last vlan was detached.
782 */
783 VLAN_FOREACH_UNTIL_SAFE(ifv, ifp->if_vlantrunk,
784 ifp->if_vlantrunk == NULL)
785 vlan_unconfig_locked(ifv->ifv_ifp, 1);
786
787 /* Trunk should have been destroyed in vlan_unconfig(). */
788 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__));
789 VLAN_XUNLOCK();
790 }
791
792 /*
793 * Return the trunk device for a virtual interface.
794 */
795 static struct ifnet *
vlan_trunkdev(struct ifnet * ifp)796 vlan_trunkdev(struct ifnet *ifp)
797 {
798 struct ifvlan *ifv;
799
800 NET_EPOCH_ASSERT();
801
802 if (ifp->if_type != IFT_L2VLAN)
803 return (NULL);
804
805 ifv = ifp->if_softc;
806 ifp = NULL;
807 if (ifv->ifv_trunk)
808 ifp = PARENT(ifv);
809 return (ifp);
810 }
811
812 /*
813 * Return the 12-bit VLAN VID for this interface, for use by external
814 * components such as Infiniband.
815 *
816 * XXXRW: Note that the function name here is historical; it should be named
817 * vlan_vid().
818 */
819 static int
vlan_tag(struct ifnet * ifp,uint16_t * vidp)820 vlan_tag(struct ifnet *ifp, uint16_t *vidp)
821 {
822 struct ifvlan *ifv;
823
824 if (ifp->if_type != IFT_L2VLAN)
825 return (EINVAL);
826 ifv = ifp->if_softc;
827 *vidp = ifv->ifv_vid;
828 return (0);
829 }
830
831 static int
vlan_pcp(struct ifnet * ifp,uint16_t * pcpp)832 vlan_pcp(struct ifnet *ifp, uint16_t *pcpp)
833 {
834 struct ifvlan *ifv;
835
836 if (ifp->if_type != IFT_L2VLAN)
837 return (EINVAL);
838 ifv = ifp->if_softc;
839 *pcpp = ifv->ifv_pcp;
840 return (0);
841 }
842
843 /*
844 * Return a driver specific cookie for this interface. Synchronization
845 * with setcookie must be provided by the driver.
846 */
847 static void *
vlan_cookie(struct ifnet * ifp)848 vlan_cookie(struct ifnet *ifp)
849 {
850 struct ifvlan *ifv;
851
852 if (ifp->if_type != IFT_L2VLAN)
853 return (NULL);
854 ifv = ifp->if_softc;
855 return (ifv->ifv_cookie);
856 }
857
858 /*
859 * Store a cookie in our softc that drivers can use to store driver
860 * private per-instance data in.
861 */
862 static int
vlan_setcookie(struct ifnet * ifp,void * cookie)863 vlan_setcookie(struct ifnet *ifp, void *cookie)
864 {
865 struct ifvlan *ifv;
866
867 if (ifp->if_type != IFT_L2VLAN)
868 return (EINVAL);
869 ifv = ifp->if_softc;
870 ifv->ifv_cookie = cookie;
871 return (0);
872 }
873
874 /*
875 * Return the vlan device present at the specific VID.
876 */
877 static struct ifnet *
vlan_devat(struct ifnet * ifp,uint16_t vid)878 vlan_devat(struct ifnet *ifp, uint16_t vid)
879 {
880 struct ifvlantrunk *trunk;
881 struct ifvlan *ifv;
882
883 NET_EPOCH_ASSERT();
884
885 trunk = ifp->if_vlantrunk;
886 if (trunk == NULL)
887 return (NULL);
888 ifp = NULL;
889 ifv = vlan_gethash(trunk, vid);
890 if (ifv)
891 ifp = ifv->ifv_ifp;
892 return (ifp);
893 }
894
895 /*
896 * VLAN support can be loaded as a module. The only place in the
897 * system that's intimately aware of this is ether_input. We hook
898 * into this code through vlan_input_p which is defined there and
899 * set here. No one else in the system should be aware of this so
900 * we use an explicit reference here.
901 */
902 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *);
903
904 /* For if_link_state_change() eyes only... */
905 extern void (*vlan_link_state_p)(struct ifnet *);
906
907 static struct if_clone_addreq_v2 vlan_addreq = {
908 .version = 2,
909 .match_f = vlan_clone_match,
910 .create_f = vlan_clone_create,
911 .destroy_f = vlan_clone_destroy,
912 .create_nl_f = vlan_clone_create_nl,
913 .modify_nl_f = vlan_clone_modify_nl,
914 .dump_nl_f = vlan_clone_dump_nl,
915 };
916
917 static int
vlan_modevent(module_t mod,int type,void * data)918 vlan_modevent(module_t mod, int type, void *data)
919 {
920
921 switch (type) {
922 case MOD_LOAD:
923 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
924 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
925 if (ifdetach_tag == NULL)
926 return (ENOMEM);
927 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event,
928 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
929 if (iflladdr_tag == NULL)
930 return (ENOMEM);
931 ifevent_tag = EVENTHANDLER_REGISTER(ifnet_event,
932 vlan_ifevent, NULL, EVENTHANDLER_PRI_ANY);
933 if (ifevent_tag == NULL)
934 return (ENOMEM);
935 VLAN_LOCKING_INIT();
936 vlan_input_p = vlan_input;
937 vlan_link_state_p = vlan_link_state;
938 vlan_trunk_cap_p = vlan_trunk_capabilities;
939 vlan_trunkdev_p = vlan_trunkdev;
940 vlan_cookie_p = vlan_cookie;
941 vlan_setcookie_p = vlan_setcookie;
942 vlan_tag_p = vlan_tag;
943 vlan_pcp_p = vlan_pcp;
944 vlan_devat_p = vlan_devat;
945 #ifndef VIMAGE
946 vlan_cloner = ifc_attach_cloner(vlanname, (struct if_clone_addreq *)&vlan_addreq);
947 #endif
948 if (bootverbose)
949 printf("vlan: initialized, using "
950 #ifdef VLAN_ARRAY
951 "full-size arrays"
952 #else
953 "hash tables with chaining"
954 #endif
955
956 "\n");
957 break;
958 case MOD_UNLOAD:
959 #ifndef VIMAGE
960 ifc_detach_cloner(vlan_cloner);
961 #endif
962 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag);
963 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag);
964 EVENTHANDLER_DEREGISTER(ifnet_event, ifevent_tag);
965 vlan_input_p = NULL;
966 vlan_link_state_p = NULL;
967 vlan_trunk_cap_p = NULL;
968 vlan_trunkdev_p = NULL;
969 vlan_tag_p = NULL;
970 vlan_cookie_p = NULL;
971 vlan_setcookie_p = NULL;
972 vlan_devat_p = NULL;
973 VLAN_LOCKING_DESTROY();
974 if (bootverbose)
975 printf("vlan: unloaded\n");
976 break;
977 default:
978 return (EOPNOTSUPP);
979 }
980 return (0);
981 }
982
983 static moduledata_t vlan_mod = {
984 "if_vlan",
985 vlan_modevent,
986 0
987 };
988
989 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
990 MODULE_VERSION(if_vlan, 3);
991
992 #ifdef VIMAGE
993 static void
vnet_vlan_init(const void * unused __unused)994 vnet_vlan_init(const void *unused __unused)
995 {
996 vlan_cloner = ifc_attach_cloner(vlanname, (struct if_clone_addreq *)&vlan_addreq);
997 V_vlan_cloner = vlan_cloner;
998 }
999 VNET_SYSINIT(vnet_vlan_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
1000 vnet_vlan_init, NULL);
1001
1002 static void
vnet_vlan_uninit(const void * unused __unused)1003 vnet_vlan_uninit(const void *unused __unused)
1004 {
1005
1006 ifc_detach_cloner(V_vlan_cloner);
1007 }
1008 VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
1009 vnet_vlan_uninit, NULL);
1010 #endif
1011
1012 /*
1013 * Check for <etherif>.<vlan>[.<vlan> ...] style interface names.
1014 */
1015 static struct ifnet *
vlan_clone_match_ethervid(const char * name,int * vidp)1016 vlan_clone_match_ethervid(const char *name, int *vidp)
1017 {
1018 char ifname[IFNAMSIZ];
1019 char *cp;
1020 struct ifnet *ifp;
1021 int vid;
1022
1023 strlcpy(ifname, name, IFNAMSIZ);
1024 if ((cp = strrchr(ifname, '.')) == NULL)
1025 return (NULL);
1026 *cp = '\0';
1027 if ((ifp = ifunit_ref(ifname)) == NULL)
1028 return (NULL);
1029 /* Parse VID. */
1030 if (*++cp == '\0') {
1031 if_rele(ifp);
1032 return (NULL);
1033 }
1034 vid = 0;
1035 for(; *cp >= '0' && *cp <= '9'; cp++)
1036 vid = (vid * 10) + (*cp - '0');
1037 if (*cp != '\0') {
1038 if_rele(ifp);
1039 return (NULL);
1040 }
1041 if (vidp != NULL)
1042 *vidp = vid;
1043
1044 return (ifp);
1045 }
1046
1047 static int
vlan_clone_match(struct if_clone * ifc,const char * name)1048 vlan_clone_match(struct if_clone *ifc, const char *name)
1049 {
1050 struct ifnet *ifp;
1051 const char *cp;
1052
1053 ifp = vlan_clone_match_ethervid(name, NULL);
1054 if (ifp != NULL) {
1055 if_rele(ifp);
1056 return (1);
1057 }
1058
1059 if (strncmp(vlanname, name, strlen(vlanname)) != 0)
1060 return (0);
1061 for (cp = name + 4; *cp != '\0'; cp++) {
1062 if (*cp < '0' || *cp > '9')
1063 return (0);
1064 }
1065
1066 return (1);
1067 }
1068
1069 static int
vlan_clone_create(struct if_clone * ifc,char * name,size_t len,struct ifc_data * ifd,struct ifnet ** ifpp)1070 vlan_clone_create(struct if_clone *ifc, char *name, size_t len,
1071 struct ifc_data *ifd, struct ifnet **ifpp)
1072 {
1073 char *dp;
1074 bool wildcard = false;
1075 bool subinterface = false;
1076 int unit;
1077 int error;
1078 int vid = 0;
1079 uint16_t proto = ETHERTYPE_VLAN;
1080 struct ifvlan *ifv;
1081 struct ifnet *ifp;
1082 struct ifnet *p = NULL;
1083 struct ifaddr *ifa;
1084 struct sockaddr_dl *sdl;
1085 struct vlanreq vlr;
1086 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
1087
1088
1089 /*
1090 * There are three ways to specify the cloned device:
1091 * o pass a parameter block with the clone request.
1092 * o specify parameters in the text of the clone device name
1093 * o specify no parameters and get an unattached device that
1094 * must be configured separately.
1095 * The first technique is preferred; the latter two are supported
1096 * for backwards compatibility.
1097 *
1098 * XXXRW: Note historic use of the word "tag" here. New ioctls may be
1099 * called for.
1100 */
1101
1102 if (ifd->params != NULL) {
1103 error = ifc_copyin(ifd, &vlr, sizeof(vlr));
1104 if (error)
1105 return error;
1106 vid = vlr.vlr_tag;
1107 proto = vlr.vlr_proto;
1108 if (proto == 0)
1109 proto = ETHERTYPE_VLAN;
1110 p = ifunit_ref(vlr.vlr_parent);
1111 if (p == NULL)
1112 return (ENXIO);
1113 }
1114
1115 if ((error = ifc_name2unit(name, &unit)) == 0) {
1116
1117 /*
1118 * vlanX interface. Set wildcard to true if the unit number
1119 * is not fixed (-1)
1120 */
1121 wildcard = (unit < 0);
1122 } else {
1123 struct ifnet *p_tmp = vlan_clone_match_ethervid(name, &vid);
1124 if (p_tmp != NULL) {
1125 error = 0;
1126 subinterface = true;
1127 unit = IF_DUNIT_NONE;
1128 wildcard = false;
1129 if (p != NULL) {
1130 if_rele(p_tmp);
1131 if (p != p_tmp)
1132 error = EINVAL;
1133 } else
1134 p = p_tmp;
1135 } else
1136 error = ENXIO;
1137 }
1138
1139 if (error != 0) {
1140 if (p != NULL)
1141 if_rele(p);
1142 return (error);
1143 }
1144
1145 if (!subinterface) {
1146 /* vlanX interface, mark X as busy or allocate new unit # */
1147 error = ifc_alloc_unit(ifc, &unit);
1148 if (error != 0) {
1149 if (p != NULL)
1150 if_rele(p);
1151 return (error);
1152 }
1153 }
1154
1155 /* In the wildcard case, we need to update the name. */
1156 if (wildcard) {
1157 for (dp = name; *dp != '\0'; dp++);
1158 if (snprintf(dp, len - (dp-name), "%d", unit) >
1159 len - (dp-name) - 1) {
1160 panic("%s: interface name too long", __func__);
1161 }
1162 }
1163
1164 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO);
1165 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER);
1166 CK_SLIST_INIT(&ifv->vlan_mc_listhead);
1167 ifp->if_softc = ifv;
1168 /*
1169 * Set the name manually rather than using if_initname because
1170 * we don't conform to the default naming convention for interfaces.
1171 */
1172 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1173 ifp->if_dname = vlanname;
1174 ifp->if_dunit = unit;
1175
1176 ifp->if_init = vlan_init;
1177 #ifdef ALTQ
1178 ifp->if_start = vlan_altq_start;
1179 ifp->if_transmit = vlan_altq_transmit;
1180 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
1181 ifp->if_snd.ifq_drv_maxlen = 0;
1182 IFQ_SET_READY(&ifp->if_snd);
1183 #else
1184 ifp->if_transmit = vlan_transmit;
1185 #endif
1186 ifp->if_qflush = vlan_qflush;
1187 ifp->if_ioctl = vlan_ioctl;
1188 #if defined(KERN_TLS) || defined(RATELIMIT)
1189 ifp->if_snd_tag_alloc = vlan_snd_tag_alloc;
1190 ifp->if_ratelimit_query = vlan_ratelimit_query;
1191 #endif
1192 ifp->if_flags = VLAN_IFFLAGS;
1193 ether_ifattach(ifp, eaddr);
1194 /* Now undo some of the damage... */
1195 ifp->if_baudrate = 0;
1196 ifp->if_type = IFT_L2VLAN;
1197 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN;
1198 ifa = ifp->if_addr;
1199 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1200 sdl->sdl_type = IFT_L2VLAN;
1201
1202 if (p != NULL) {
1203 error = vlan_config(ifv, p, vid, proto);
1204 if_rele(p);
1205 if (error != 0) {
1206 /*
1207 * Since we've partially failed, we need to back
1208 * out all the way, otherwise userland could get
1209 * confused. Thus, we destroy the interface.
1210 */
1211 ether_ifdetach(ifp);
1212 vlan_unconfig(ifp);
1213 if_free(ifp);
1214 if (!subinterface)
1215 ifc_free_unit(ifc, unit);
1216 free(ifv, M_VLAN);
1217
1218 return (error);
1219 }
1220 }
1221 *ifpp = ifp;
1222
1223 return (0);
1224 }
1225
1226 /*
1227 *
1228 * Parsers of IFLA_INFO_DATA inside IFLA_LINKINFO of RTM_NEWLINK
1229 * {{nla_len=8, nla_type=IFLA_LINK}, 2},
1230 * {{nla_len=12, nla_type=IFLA_IFNAME}, "xvlan22"},
1231 * {{nla_len=24, nla_type=IFLA_LINKINFO},
1232 * [
1233 * {{nla_len=8, nla_type=IFLA_INFO_KIND}, "vlan"...},
1234 * {{nla_len=12, nla_type=IFLA_INFO_DATA}, "\x06\x00\x01\x00\x16\x00\x00\x00"}]}
1235 */
1236
1237 struct nl_parsed_vlan {
1238 uint16_t vlan_id;
1239 uint16_t vlan_proto;
1240 struct ifla_vlan_flags vlan_flags;
1241 };
1242
1243 #define _OUT(_field) offsetof(struct nl_parsed_vlan, _field)
1244 static const struct nlattr_parser nla_p_vlan[] = {
1245 { .type = IFLA_VLAN_ID, .off = _OUT(vlan_id), .cb = nlattr_get_uint16 },
1246 { .type = IFLA_VLAN_FLAGS, .off = _OUT(vlan_flags), .cb = nlattr_get_nla },
1247 { .type = IFLA_VLAN_PROTOCOL, .off = _OUT(vlan_proto), .cb = nlattr_get_uint16 },
1248 };
1249 #undef _OUT
1250 NL_DECLARE_ATTR_PARSER(vlan_parser, nla_p_vlan);
1251
1252 static int
vlan_clone_create_nl(struct if_clone * ifc,char * name,size_t len,struct ifc_data_nl * ifd)1253 vlan_clone_create_nl(struct if_clone *ifc, char *name, size_t len,
1254 struct ifc_data_nl *ifd)
1255 {
1256 struct epoch_tracker et;
1257 struct ifnet *ifp_parent;
1258 struct nl_pstate *npt = ifd->npt;
1259 struct nl_parsed_link *lattrs = ifd->lattrs;
1260 int error;
1261
1262 /*
1263 * lattrs.ifla_ifname is the new interface name
1264 * lattrs.ifi_index contains parent interface index
1265 * lattrs.ifla_idata contains un-parsed vlan data
1266 */
1267 struct nl_parsed_vlan attrs = {
1268 .vlan_id = 0xFEFE,
1269 .vlan_proto = ETHERTYPE_VLAN
1270 };
1271
1272 if (lattrs->ifla_idata == NULL) {
1273 nlmsg_report_err_msg(npt, "vlan id is required, guessing not supported");
1274 return (ENOTSUP);
1275 }
1276
1277 error = nl_parse_nested(lattrs->ifla_idata, &vlan_parser, npt, &attrs);
1278 if (error != 0)
1279 return (error);
1280 if (attrs.vlan_id > 4095) {
1281 nlmsg_report_err_msg(npt, "Invalid VID: %d", attrs.vlan_id);
1282 return (EINVAL);
1283 }
1284 if (attrs.vlan_proto != ETHERTYPE_VLAN && attrs.vlan_proto != ETHERTYPE_QINQ) {
1285 nlmsg_report_err_msg(npt, "Unsupported ethertype: 0x%04X", attrs.vlan_proto);
1286 return (ENOTSUP);
1287 }
1288
1289 struct vlanreq params = {
1290 .vlr_tag = attrs.vlan_id,
1291 .vlr_proto = attrs.vlan_proto,
1292 };
1293 struct ifc_data ifd_new = { .flags = IFC_F_SYSSPACE, .unit = ifd->unit, .params = ¶ms };
1294
1295 NET_EPOCH_ENTER(et);
1296 ifp_parent = ifnet_byindex(lattrs->ifi_index);
1297 if (ifp_parent != NULL)
1298 strlcpy(params.vlr_parent, if_name(ifp_parent), sizeof(params.vlr_parent));
1299 NET_EPOCH_EXIT(et);
1300
1301 if (ifp_parent == NULL) {
1302 nlmsg_report_err_msg(npt, "unable to find parent interface %u", lattrs->ifi_index);
1303 return (ENOENT);
1304 }
1305
1306 error = vlan_clone_create(ifc, name, len, &ifd_new, &ifd->ifp);
1307
1308 return (error);
1309 }
1310
1311 static int
vlan_clone_modify_nl(struct ifnet * ifp,struct ifc_data_nl * ifd)1312 vlan_clone_modify_nl(struct ifnet *ifp, struct ifc_data_nl *ifd)
1313 {
1314 struct nl_parsed_link *lattrs = ifd->lattrs;
1315
1316 if ((lattrs->ifla_idata != NULL) && ((ifd->flags & IFC_F_CREATE) == 0)) {
1317 struct epoch_tracker et;
1318 struct nl_parsed_vlan attrs = {
1319 .vlan_proto = ETHERTYPE_VLAN,
1320 };
1321 int error;
1322
1323 error = nl_parse_nested(lattrs->ifla_idata, &vlan_parser, ifd->npt, &attrs);
1324 if (error != 0)
1325 return (error);
1326
1327 NET_EPOCH_ENTER(et);
1328 struct ifnet *ifp_parent = ifnet_byindex_ref(lattrs->ifla_link);
1329 NET_EPOCH_EXIT(et);
1330
1331 if (ifp_parent == NULL) {
1332 nlmsg_report_err_msg(ifd->npt, "unable to find parent interface %u",
1333 lattrs->ifla_link);
1334 return (ENOENT);
1335 }
1336
1337 struct ifvlan *ifv = ifp->if_softc;
1338 error = vlan_config(ifv, ifp_parent, attrs.vlan_id, attrs.vlan_proto);
1339
1340 if_rele(ifp_parent);
1341 if (error != 0)
1342 return (error);
1343 }
1344
1345 return (nl_modify_ifp_generic(ifp, ifd->lattrs, ifd->bm, ifd->npt));
1346 }
1347
1348 /*
1349 * {{nla_len=24, nla_type=IFLA_LINKINFO},
1350 * [
1351 * {{nla_len=8, nla_type=IFLA_INFO_KIND}, "vlan"...},
1352 * {{nla_len=12, nla_type=IFLA_INFO_DATA}, "\x06\x00\x01\x00\x16\x00\x00\x00"}]}
1353 */
1354 static void
vlan_clone_dump_nl(struct ifnet * ifp,struct nl_writer * nw)1355 vlan_clone_dump_nl(struct ifnet *ifp, struct nl_writer *nw)
1356 {
1357 uint32_t parent_index = 0;
1358 uint16_t vlan_id = 0;
1359 uint16_t vlan_proto = 0;
1360
1361 VLAN_SLOCK();
1362 struct ifvlan *ifv = ifp->if_softc;
1363 if (TRUNK(ifv) != NULL)
1364 parent_index = PARENT(ifv)->if_index;
1365 vlan_id = ifv->ifv_vid;
1366 vlan_proto = ifv->ifv_proto;
1367 VLAN_SUNLOCK();
1368
1369 if (parent_index != 0)
1370 nlattr_add_u32(nw, IFLA_LINK, parent_index);
1371
1372 int off = nlattr_add_nested(nw, IFLA_LINKINFO);
1373 if (off != 0) {
1374 nlattr_add_string(nw, IFLA_INFO_KIND, "vlan");
1375 int off2 = nlattr_add_nested(nw, IFLA_INFO_DATA);
1376 if (off2 != 0) {
1377 nlattr_add_u16(nw, IFLA_VLAN_ID, vlan_id);
1378 nlattr_add_u16(nw, IFLA_VLAN_PROTOCOL, vlan_proto);
1379 nlattr_set_len(nw, off2);
1380 }
1381 nlattr_set_len(nw, off);
1382 }
1383 }
1384
1385 static int
vlan_clone_destroy(struct if_clone * ifc,struct ifnet * ifp,uint32_t flags)1386 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags)
1387 {
1388 struct ifvlan *ifv = ifp->if_softc;
1389 int unit = ifp->if_dunit;
1390
1391 if (ifp->if_vlantrunk)
1392 return (EBUSY);
1393
1394 #ifdef ALTQ
1395 IFQ_PURGE(&ifp->if_snd);
1396 #endif
1397 ether_ifdetach(ifp); /* first, remove it from system-wide lists */
1398 vlan_unconfig(ifp); /* now it can be unconfigured and freed */
1399 /*
1400 * We should have the only reference to the ifv now, so we can now
1401 * drain any remaining lladdr task before freeing the ifnet and the
1402 * ifvlan.
1403 */
1404 taskqueue_drain(taskqueue_thread, &ifv->lladdr_task);
1405 NET_EPOCH_WAIT();
1406 if_free(ifp);
1407 free(ifv, M_VLAN);
1408 if (unit != IF_DUNIT_NONE)
1409 ifc_free_unit(ifc, unit);
1410
1411 return (0);
1412 }
1413
1414 /*
1415 * The ifp->if_init entry point for vlan(4) is a no-op.
1416 */
1417 static void
vlan_init(void * foo __unused)1418 vlan_init(void *foo __unused)
1419 {
1420 }
1421
1422 /*
1423 * The if_transmit method for vlan(4) interface.
1424 */
1425 static int
vlan_transmit(struct ifnet * ifp,struct mbuf * m)1426 vlan_transmit(struct ifnet *ifp, struct mbuf *m)
1427 {
1428 struct ifvlan *ifv;
1429 struct ifnet *p;
1430 int error, len, mcast;
1431
1432 NET_EPOCH_ASSERT();
1433
1434 ifv = ifp->if_softc;
1435 if (TRUNK(ifv) == NULL) {
1436 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1437 m_freem(m);
1438 return (ENETDOWN);
1439 }
1440 p = PARENT(ifv);
1441 len = m->m_pkthdr.len;
1442 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0;
1443
1444 BPF_MTAP(ifp, m);
1445
1446 #if defined(KERN_TLS) || defined(RATELIMIT)
1447 if (m->m_pkthdr.csum_flags & CSUM_SND_TAG) {
1448 struct vlan_snd_tag *vst;
1449 struct m_snd_tag *mst;
1450
1451 MPASS(m->m_pkthdr.snd_tag->ifp == ifp);
1452 mst = m->m_pkthdr.snd_tag;
1453 vst = mst_to_vst(mst);
1454 if (vst->tag->ifp != p) {
1455 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1456 m_freem(m);
1457 return (EAGAIN);
1458 }
1459
1460 m->m_pkthdr.snd_tag = m_snd_tag_ref(vst->tag);
1461 m_snd_tag_rele(mst);
1462 }
1463 #endif
1464
1465 /*
1466 * Do not run parent's if_transmit() if the parent is not up,
1467 * or parent's driver will cause a system crash.
1468 */
1469 if (!UP_AND_RUNNING(p)) {
1470 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1471 m_freem(m);
1472 return (ENETDOWN);
1473 }
1474
1475 if (!ether_8021q_frame(&m, ifp, p, &ifv->ifv_qtag)) {
1476 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1477 return (0);
1478 }
1479
1480 /*
1481 * Send it, precisely as ether_output() would have.
1482 */
1483 error = (p->if_transmit)(p, m);
1484 if (error == 0) {
1485 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
1486 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
1487 if_inc_counter(ifp, IFCOUNTER_OMCASTS, mcast);
1488 } else
1489 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1490 return (error);
1491 }
1492
1493 static int
vlan_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * dst,struct route * ro)1494 vlan_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
1495 struct route *ro)
1496 {
1497 struct ifvlan *ifv;
1498 struct ifnet *p;
1499
1500 NET_EPOCH_ASSERT();
1501
1502 /*
1503 * Find the first non-VLAN parent interface.
1504 */
1505 ifv = ifp->if_softc;
1506 do {
1507 if (TRUNK(ifv) == NULL) {
1508 m_freem(m);
1509 return (ENETDOWN);
1510 }
1511 p = PARENT(ifv);
1512 ifv = p->if_softc;
1513 } while (p->if_type == IFT_L2VLAN);
1514
1515 return p->if_output(ifp, m, dst, ro);
1516 }
1517
1518 #ifdef ALTQ
1519 static void
vlan_altq_start(if_t ifp)1520 vlan_altq_start(if_t ifp)
1521 {
1522 struct ifaltq *ifq = &ifp->if_snd;
1523 struct mbuf *m;
1524
1525 IFQ_LOCK(ifq);
1526 IFQ_DEQUEUE_NOLOCK(ifq, m);
1527 while (m != NULL) {
1528 vlan_transmit(ifp, m);
1529 IFQ_DEQUEUE_NOLOCK(ifq, m);
1530 }
1531 IFQ_UNLOCK(ifq);
1532 }
1533
1534 static int
vlan_altq_transmit(if_t ifp,struct mbuf * m)1535 vlan_altq_transmit(if_t ifp, struct mbuf *m)
1536 {
1537 int err;
1538
1539 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
1540 IFQ_ENQUEUE(&ifp->if_snd, m, err);
1541 if (err == 0)
1542 vlan_altq_start(ifp);
1543 } else
1544 err = vlan_transmit(ifp, m);
1545
1546 return (err);
1547 }
1548 #endif /* ALTQ */
1549
1550 /*
1551 * The ifp->if_qflush entry point for vlan(4) is a no-op.
1552 */
1553 static void
vlan_qflush(struct ifnet * ifp __unused)1554 vlan_qflush(struct ifnet *ifp __unused)
1555 {
1556 }
1557
1558 static void
vlan_input(struct ifnet * ifp,struct mbuf * m)1559 vlan_input(struct ifnet *ifp, struct mbuf *m)
1560 {
1561 struct ifvlantrunk *trunk;
1562 struct ifvlan *ifv;
1563 struct m_tag *mtag;
1564 uint16_t vid, tag;
1565
1566 NET_EPOCH_ASSERT();
1567
1568 trunk = ifp->if_vlantrunk;
1569 if (trunk == NULL) {
1570 m_freem(m);
1571 return;
1572 }
1573
1574 if (m->m_flags & M_VLANTAG) {
1575 /*
1576 * Packet is tagged, but m contains a normal
1577 * Ethernet frame; the tag is stored out-of-band.
1578 */
1579 tag = m->m_pkthdr.ether_vtag;
1580 m->m_flags &= ~M_VLANTAG;
1581 } else {
1582 struct ether_vlan_header *evl;
1583
1584 /*
1585 * Packet is tagged in-band as specified by 802.1q.
1586 */
1587 switch (ifp->if_type) {
1588 case IFT_ETHER:
1589 if (m->m_len < sizeof(*evl) &&
1590 (m = m_pullup(m, sizeof(*evl))) == NULL) {
1591 if_printf(ifp, "cannot pullup VLAN header\n");
1592 return;
1593 }
1594 evl = mtod(m, struct ether_vlan_header *);
1595 tag = ntohs(evl->evl_tag);
1596
1597 /*
1598 * Remove the 802.1q header by copying the Ethernet
1599 * addresses over it and adjusting the beginning of
1600 * the data in the mbuf. The encapsulated Ethernet
1601 * type field is already in place.
1602 */
1603 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
1604 ETHER_HDR_LEN - ETHER_TYPE_LEN);
1605 m_adj(m, ETHER_VLAN_ENCAP_LEN);
1606 break;
1607
1608 default:
1609 #ifdef INVARIANTS
1610 panic("%s: %s has unsupported if_type %u",
1611 __func__, ifp->if_xname, ifp->if_type);
1612 #endif
1613 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
1614 m_freem(m);
1615 return;
1616 }
1617 }
1618
1619 vid = EVL_VLANOFTAG(tag);
1620
1621 ifv = vlan_gethash(trunk, vid);
1622 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) {
1623 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
1624 m_freem(m);
1625 return;
1626 }
1627
1628 if (V_vlan_mtag_pcp) {
1629 /*
1630 * While uncommon, it is possible that we will find a 802.1q
1631 * packet encapsulated inside another packet that also had an
1632 * 802.1q header. For example, ethernet tunneled over IPSEC
1633 * arriving over ethernet. In that case, we replace the
1634 * existing 802.1q PCP m_tag value.
1635 */
1636 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
1637 if (mtag == NULL) {
1638 mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_IN,
1639 sizeof(uint8_t), M_NOWAIT);
1640 if (mtag == NULL) {
1641 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1642 m_freem(m);
1643 return;
1644 }
1645 m_tag_prepend(m, mtag);
1646 }
1647 *(uint8_t *)(mtag + 1) = EVL_PRIOFTAG(tag);
1648 }
1649
1650 m->m_pkthdr.rcvif = ifv->ifv_ifp;
1651 if_inc_counter(ifv->ifv_ifp, IFCOUNTER_IPACKETS, 1);
1652
1653 /* Pass it back through the parent's input routine. */
1654 (*ifv->ifv_ifp->if_input)(ifv->ifv_ifp, m);
1655 }
1656
1657 static void
vlan_lladdr_fn(void * arg,int pending __unused)1658 vlan_lladdr_fn(void *arg, int pending __unused)
1659 {
1660 struct ifvlan *ifv;
1661 struct ifnet *ifp;
1662
1663 ifv = (struct ifvlan *)arg;
1664 ifp = ifv->ifv_ifp;
1665
1666 CURVNET_SET(ifp->if_vnet);
1667
1668 /* The ifv_ifp already has the lladdr copied in. */
1669 if_setlladdr(ifp, IF_LLADDR(ifp), ifp->if_addrlen);
1670
1671 CURVNET_RESTORE();
1672 }
1673
1674 static int
vlan_config(struct ifvlan * ifv,struct ifnet * p,uint16_t vid,uint16_t proto)1675 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t vid,
1676 uint16_t proto)
1677 {
1678 struct epoch_tracker et;
1679 struct ifvlantrunk *trunk;
1680 struct ifnet *ifp;
1681 int error = 0;
1682
1683 /*
1684 * We can handle non-ethernet hardware types as long as
1685 * they handle the tagging and headers themselves.
1686 */
1687 if (p->if_type != IFT_ETHER &&
1688 p->if_type != IFT_L2VLAN &&
1689 (p->if_capenable & IFCAP_VLAN_HWTAGGING) == 0)
1690 return (EPROTONOSUPPORT);
1691 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS)
1692 return (EPROTONOSUPPORT);
1693 /*
1694 * Don't let the caller set up a VLAN VID with
1695 * anything except VLID bits.
1696 * VID numbers 0x0 and 0xFFF are reserved.
1697 */
1698 if (vid == 0 || vid == 0xFFF || (vid & ~EVL_VLID_MASK))
1699 return (EINVAL);
1700 if (ifv->ifv_trunk) {
1701 trunk = ifv->ifv_trunk;
1702 if (trunk->parent != p)
1703 return (EBUSY);
1704
1705 VLAN_XLOCK();
1706
1707 ifv->ifv_proto = proto;
1708
1709 if (ifv->ifv_vid != vid) {
1710 int oldvid = ifv->ifv_vid;
1711
1712 /* Re-hash */
1713 vlan_remhash(trunk, ifv);
1714 ifv->ifv_vid = vid;
1715 error = vlan_inshash(trunk, ifv);
1716 if (error) {
1717 int ret __diagused;
1718
1719 ifv->ifv_vid = oldvid;
1720 /* Re-insert back where we found it. */
1721 ret = vlan_inshash(trunk, ifv);
1722 MPASS(ret == 0);
1723 }
1724 }
1725 /* Will unlock */
1726 goto done;
1727 }
1728
1729 VLAN_XLOCK();
1730 if (p->if_vlantrunk == NULL) {
1731 trunk = malloc(sizeof(struct ifvlantrunk),
1732 M_VLAN, M_WAITOK | M_ZERO);
1733 vlan_inithash(trunk);
1734 TRUNK_LOCK_INIT(trunk);
1735 TRUNK_WLOCK(trunk);
1736 p->if_vlantrunk = trunk;
1737 trunk->parent = p;
1738 if_ref(trunk->parent);
1739 TRUNK_WUNLOCK(trunk);
1740 } else {
1741 trunk = p->if_vlantrunk;
1742 }
1743
1744 ifv->ifv_vid = vid; /* must set this before vlan_inshash() */
1745 ifv->ifv_pcp = 0; /* Default: best effort delivery. */
1746 error = vlan_inshash(trunk, ifv);
1747 if (error)
1748 goto done;
1749 ifv->ifv_proto = proto;
1750 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN;
1751 ifv->ifv_mintu = ETHERMIN;
1752 ifv->ifv_pflags = 0;
1753 ifv->ifv_capenable = -1;
1754
1755 /*
1756 * If the parent supports the VLAN_MTU capability,
1757 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames,
1758 * use it.
1759 */
1760 if (p->if_capenable & IFCAP_VLAN_MTU) {
1761 /*
1762 * No need to fudge the MTU since the parent can
1763 * handle extended frames.
1764 */
1765 ifv->ifv_mtufudge = 0;
1766 } else {
1767 /*
1768 * Fudge the MTU by the encapsulation size. This
1769 * makes us incompatible with strictly compliant
1770 * 802.1Q implementations, but allows us to use
1771 * the feature with other NetBSD implementations,
1772 * which might still be useful.
1773 */
1774 ifv->ifv_mtufudge = ifv->ifv_encaplen;
1775 }
1776
1777 ifv->ifv_trunk = trunk;
1778 ifp = ifv->ifv_ifp;
1779 /*
1780 * Initialize fields from our parent. This duplicates some
1781 * work with ether_ifattach() but allows for non-ethernet
1782 * interfaces to also work.
1783 */
1784 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge;
1785 ifp->if_baudrate = p->if_baudrate;
1786 ifp->if_input = p->if_input;
1787 ifp->if_resolvemulti = p->if_resolvemulti;
1788 ifp->if_addrlen = p->if_addrlen;
1789 ifp->if_broadcastaddr = p->if_broadcastaddr;
1790 ifp->if_pcp = ifv->ifv_pcp;
1791
1792 /*
1793 * We wrap the parent's if_output using vlan_output to ensure that it
1794 * can't become stale.
1795 */
1796 ifp->if_output = vlan_output;
1797
1798 /*
1799 * Copy only a selected subset of flags from the parent.
1800 * Other flags are none of our business.
1801 */
1802 #define VLAN_COPY_FLAGS (IFF_SIMPLEX)
1803 ifp->if_flags &= ~VLAN_COPY_FLAGS;
1804 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS;
1805 #undef VLAN_COPY_FLAGS
1806
1807 ifp->if_link_state = p->if_link_state;
1808
1809 NET_EPOCH_ENTER(et);
1810 vlan_capabilities(ifv);
1811 NET_EPOCH_EXIT(et);
1812
1813 /*
1814 * Set up our interface address to reflect the underlying
1815 * physical interface's.
1816 */
1817 TASK_INIT(&ifv->lladdr_task, 0, vlan_lladdr_fn, ifv);
1818 ((struct sockaddr_dl *)ifp->if_addr->ifa_addr)->sdl_alen =
1819 p->if_addrlen;
1820
1821 /*
1822 * Do not schedule link address update if it was the same
1823 * as previous parent's. This helps avoid updating for each
1824 * associated llentry.
1825 */
1826 if (memcmp(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen) != 0) {
1827 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen);
1828 taskqueue_enqueue(taskqueue_thread, &ifv->lladdr_task);
1829 }
1830
1831 /* We are ready for operation now. */
1832 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1833
1834 /* Update flags on the parent, if necessary. */
1835 vlan_setflags(ifp, 1);
1836
1837 /*
1838 * Configure multicast addresses that may already be
1839 * joined on the vlan device.
1840 */
1841 (void)vlan_setmulti(ifp);
1842
1843 done:
1844 if (error == 0)
1845 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_vid);
1846 VLAN_XUNLOCK();
1847
1848 return (error);
1849 }
1850
1851 static void
vlan_unconfig(struct ifnet * ifp)1852 vlan_unconfig(struct ifnet *ifp)
1853 {
1854
1855 VLAN_XLOCK();
1856 vlan_unconfig_locked(ifp, 0);
1857 VLAN_XUNLOCK();
1858 }
1859
1860 static void
vlan_unconfig_locked(struct ifnet * ifp,int departing)1861 vlan_unconfig_locked(struct ifnet *ifp, int departing)
1862 {
1863 struct ifvlantrunk *trunk;
1864 struct vlan_mc_entry *mc;
1865 struct ifvlan *ifv;
1866 struct ifnet *parent;
1867 int error;
1868
1869 VLAN_XLOCK_ASSERT();
1870
1871 ifv = ifp->if_softc;
1872 trunk = ifv->ifv_trunk;
1873 parent = NULL;
1874
1875 if (trunk != NULL) {
1876 parent = trunk->parent;
1877
1878 /*
1879 * Since the interface is being unconfigured, we need to
1880 * empty the list of multicast groups that we may have joined
1881 * while we were alive from the parent's list.
1882 */
1883 while ((mc = CK_SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) {
1884 /*
1885 * If the parent interface is being detached,
1886 * all its multicast addresses have already
1887 * been removed. Warn about errors if
1888 * if_delmulti() does fail, but don't abort as
1889 * all callers expect vlan destruction to
1890 * succeed.
1891 */
1892 if (!departing) {
1893 error = if_delmulti(parent,
1894 (struct sockaddr *)&mc->mc_addr);
1895 if (error)
1896 if_printf(ifp,
1897 "Failed to delete multicast address from parent: %d\n",
1898 error);
1899 }
1900 CK_SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries);
1901 NET_EPOCH_CALL(vlan_mc_free, &mc->mc_epoch_ctx);
1902 }
1903
1904 vlan_setflags(ifp, 0); /* clear special flags on parent */
1905
1906 vlan_remhash(trunk, ifv);
1907 ifv->ifv_trunk = NULL;
1908
1909 /*
1910 * Check if we were the last.
1911 */
1912 if (trunk->refcnt == 0) {
1913 parent->if_vlantrunk = NULL;
1914 NET_EPOCH_WAIT();
1915 trunk_destroy(trunk);
1916 }
1917 }
1918
1919 /* Disconnect from parent. */
1920 if (ifv->ifv_pflags)
1921 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__);
1922 ifp->if_mtu = ETHERMTU;
1923 ifp->if_link_state = LINK_STATE_UNKNOWN;
1924 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1925
1926 /*
1927 * Only dispatch an event if vlan was
1928 * attached, otherwise there is nothing
1929 * to cleanup anyway.
1930 */
1931 if (parent != NULL)
1932 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_vid);
1933 }
1934
1935 /* Handle a reference counted flag that should be set on the parent as well */
1936 static int
vlan_setflag(struct ifnet * ifp,int flag,int status,int (* func)(struct ifnet *,int))1937 vlan_setflag(struct ifnet *ifp, int flag, int status,
1938 int (*func)(struct ifnet *, int))
1939 {
1940 struct ifvlan *ifv;
1941 int error;
1942
1943 VLAN_SXLOCK_ASSERT();
1944
1945 ifv = ifp->if_softc;
1946 status = status ? (ifp->if_flags & flag) : 0;
1947 /* Now "status" contains the flag value or 0 */
1948
1949 /*
1950 * See if recorded parent's status is different from what
1951 * we want it to be. If it is, flip it. We record parent's
1952 * status in ifv_pflags so that we won't clear parent's flag
1953 * we haven't set. In fact, we don't clear or set parent's
1954 * flags directly, but get or release references to them.
1955 * That's why we can be sure that recorded flags still are
1956 * in accord with actual parent's flags.
1957 */
1958 if (status != (ifv->ifv_pflags & flag)) {
1959 error = (*func)(PARENT(ifv), status);
1960 if (error)
1961 return (error);
1962 ifv->ifv_pflags &= ~flag;
1963 ifv->ifv_pflags |= status;
1964 }
1965 return (0);
1966 }
1967
1968 /*
1969 * Handle IFF_* flags that require certain changes on the parent:
1970 * if "status" is true, update parent's flags respective to our if_flags;
1971 * if "status" is false, forcedly clear the flags set on parent.
1972 */
1973 static int
vlan_setflags(struct ifnet * ifp,int status)1974 vlan_setflags(struct ifnet *ifp, int status)
1975 {
1976 int error, i;
1977
1978 for (i = 0; vlan_pflags[i].flag; i++) {
1979 error = vlan_setflag(ifp, vlan_pflags[i].flag,
1980 status, vlan_pflags[i].func);
1981 if (error)
1982 return (error);
1983 }
1984 return (0);
1985 }
1986
1987 /* Inform all vlans that their parent has changed link state */
1988 static void
vlan_link_state(struct ifnet * ifp)1989 vlan_link_state(struct ifnet *ifp)
1990 {
1991 struct epoch_tracker et;
1992 struct ifvlantrunk *trunk;
1993 struct ifvlan *ifv;
1994
1995 NET_EPOCH_ENTER(et);
1996 trunk = ifp->if_vlantrunk;
1997 if (trunk == NULL) {
1998 NET_EPOCH_EXIT(et);
1999 return;
2000 }
2001
2002 TRUNK_WLOCK(trunk);
2003 VLAN_FOREACH(ifv, trunk) {
2004 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate;
2005 if_link_state_change(ifv->ifv_ifp,
2006 trunk->parent->if_link_state);
2007 }
2008 TRUNK_WUNLOCK(trunk);
2009 NET_EPOCH_EXIT(et);
2010 }
2011
2012 static void
vlan_capabilities(struct ifvlan * ifv)2013 vlan_capabilities(struct ifvlan *ifv)
2014 {
2015 struct ifnet *p;
2016 struct ifnet *ifp;
2017 struct ifnet_hw_tsomax hw_tsomax;
2018 int cap = 0, ena = 0, mena;
2019 u_long hwa = 0;
2020
2021 NET_EPOCH_ASSERT();
2022 VLAN_SXLOCK_ASSERT();
2023
2024 p = PARENT(ifv);
2025 ifp = ifv->ifv_ifp;
2026
2027 /* Mask parent interface enabled capabilities disabled by user. */
2028 mena = p->if_capenable & ifv->ifv_capenable;
2029
2030 /*
2031 * If the parent interface can do checksum offloading
2032 * on VLANs, then propagate its hardware-assisted
2033 * checksumming flags. Also assert that checksum
2034 * offloading requires hardware VLAN tagging.
2035 */
2036 if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
2037 cap |= p->if_capabilities & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6);
2038 if (p->if_capenable & IFCAP_VLAN_HWCSUM &&
2039 p->if_capenable & IFCAP_VLAN_HWTAGGING) {
2040 ena |= mena & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6);
2041 if (ena & IFCAP_TXCSUM)
2042 hwa |= p->if_hwassist & (CSUM_IP | CSUM_TCP |
2043 CSUM_UDP | CSUM_SCTP);
2044 if (ena & IFCAP_TXCSUM_IPV6)
2045 hwa |= p->if_hwassist & (CSUM_TCP_IPV6 |
2046 CSUM_UDP_IPV6 | CSUM_SCTP_IPV6);
2047 }
2048
2049 /*
2050 * If the parent interface can do TSO on VLANs then
2051 * propagate the hardware-assisted flag. TSO on VLANs
2052 * does not necessarily require hardware VLAN tagging.
2053 */
2054 memset(&hw_tsomax, 0, sizeof(hw_tsomax));
2055 if_hw_tsomax_common(p, &hw_tsomax);
2056 if_hw_tsomax_update(ifp, &hw_tsomax);
2057 if (p->if_capabilities & IFCAP_VLAN_HWTSO)
2058 cap |= p->if_capabilities & IFCAP_TSO;
2059 if (p->if_capenable & IFCAP_VLAN_HWTSO) {
2060 ena |= mena & IFCAP_TSO;
2061 if (ena & IFCAP_TSO)
2062 hwa |= p->if_hwassist & CSUM_TSO;
2063 }
2064
2065 /*
2066 * If the parent interface can do LRO and checksum offloading on
2067 * VLANs, then guess it may do LRO on VLANs. False positive here
2068 * cost nothing, while false negative may lead to some confusions.
2069 */
2070 if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
2071 cap |= p->if_capabilities & IFCAP_LRO;
2072 if (p->if_capenable & IFCAP_VLAN_HWCSUM)
2073 ena |= mena & IFCAP_LRO;
2074
2075 /*
2076 * If the parent interface can offload TCP connections over VLANs then
2077 * propagate its TOE capability to the VLAN interface.
2078 *
2079 * All TOE drivers in the tree today can deal with VLANs. If this
2080 * changes then IFCAP_VLAN_TOE should be promoted to a full capability
2081 * with its own bit.
2082 */
2083 #define IFCAP_VLAN_TOE IFCAP_TOE
2084 if (p->if_capabilities & IFCAP_VLAN_TOE)
2085 cap |= p->if_capabilities & IFCAP_TOE;
2086 if (p->if_capenable & IFCAP_VLAN_TOE) {
2087 SETTOEDEV(ifp, TOEDEV(p));
2088 ena |= mena & IFCAP_TOE;
2089 }
2090
2091 /*
2092 * If the parent interface supports dynamic link state, so does the
2093 * VLAN interface.
2094 */
2095 cap |= (p->if_capabilities & IFCAP_LINKSTATE);
2096 ena |= (mena & IFCAP_LINKSTATE);
2097
2098 #ifdef RATELIMIT
2099 /*
2100 * If the parent interface supports ratelimiting, so does the
2101 * VLAN interface.
2102 */
2103 cap |= (p->if_capabilities & IFCAP_TXRTLMT);
2104 ena |= (mena & IFCAP_TXRTLMT);
2105 #endif
2106
2107 /*
2108 * If the parent interface supports unmapped mbufs, so does
2109 * the VLAN interface. Note that this should be fine even for
2110 * interfaces that don't support hardware tagging as headers
2111 * are prepended in normal mbufs to unmapped mbufs holding
2112 * payload data.
2113 */
2114 cap |= (p->if_capabilities & IFCAP_MEXTPG);
2115 ena |= (mena & IFCAP_MEXTPG);
2116
2117 /*
2118 * If the parent interface can offload encryption and segmentation
2119 * of TLS records over TCP, propagate it's capability to the VLAN
2120 * interface.
2121 *
2122 * All TLS drivers in the tree today can deal with VLANs. If
2123 * this ever changes, then a new IFCAP_VLAN_TXTLS can be
2124 * defined.
2125 */
2126 if (p->if_capabilities & (IFCAP_TXTLS | IFCAP_TXTLS_RTLMT))
2127 cap |= p->if_capabilities & (IFCAP_TXTLS | IFCAP_TXTLS_RTLMT);
2128 if (p->if_capenable & (IFCAP_TXTLS | IFCAP_TXTLS_RTLMT))
2129 ena |= mena & (IFCAP_TXTLS | IFCAP_TXTLS_RTLMT);
2130
2131 ifp->if_capabilities = cap;
2132 ifp->if_capenable = ena;
2133 ifp->if_hwassist = hwa;
2134 }
2135
2136 static void
vlan_trunk_capabilities(struct ifnet * ifp)2137 vlan_trunk_capabilities(struct ifnet *ifp)
2138 {
2139 struct epoch_tracker et;
2140 struct ifvlantrunk *trunk;
2141 struct ifvlan *ifv;
2142
2143 VLAN_SLOCK();
2144 trunk = ifp->if_vlantrunk;
2145 if (trunk == NULL) {
2146 VLAN_SUNLOCK();
2147 return;
2148 }
2149 NET_EPOCH_ENTER(et);
2150 VLAN_FOREACH(ifv, trunk)
2151 vlan_capabilities(ifv);
2152 NET_EPOCH_EXIT(et);
2153 VLAN_SUNLOCK();
2154 }
2155
2156 static int
vlan_ioctl(struct ifnet * ifp,u_long cmd,caddr_t data)2157 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
2158 {
2159 struct ifnet *p;
2160 struct ifreq *ifr;
2161 #ifdef INET
2162 struct ifaddr *ifa;
2163 #endif
2164 struct ifvlan *ifv;
2165 struct ifvlantrunk *trunk;
2166 struct vlanreq vlr;
2167 int error = 0, oldmtu;
2168
2169 ifr = (struct ifreq *)data;
2170 #ifdef INET
2171 ifa = (struct ifaddr *) data;
2172 #endif
2173 ifv = ifp->if_softc;
2174
2175 switch (cmd) {
2176 case SIOCSIFADDR:
2177 ifp->if_flags |= IFF_UP;
2178 #ifdef INET
2179 if (ifa->ifa_addr->sa_family == AF_INET)
2180 arp_ifinit(ifp, ifa);
2181 #endif
2182 break;
2183 case SIOCGIFADDR:
2184 bcopy(IF_LLADDR(ifp), &ifr->ifr_addr.sa_data[0],
2185 ifp->if_addrlen);
2186 break;
2187 case SIOCGIFMEDIA:
2188 VLAN_SLOCK();
2189 if (TRUNK(ifv) != NULL) {
2190 p = PARENT(ifv);
2191 if_ref(p);
2192 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data);
2193 if_rele(p);
2194 /* Limit the result to the parent's current config. */
2195 if (error == 0) {
2196 struct ifmediareq *ifmr;
2197
2198 ifmr = (struct ifmediareq *)data;
2199 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) {
2200 ifmr->ifm_count = 1;
2201 error = copyout(&ifmr->ifm_current,
2202 ifmr->ifm_ulist,
2203 sizeof(int));
2204 }
2205 }
2206 } else {
2207 error = EINVAL;
2208 }
2209 VLAN_SUNLOCK();
2210 break;
2211
2212 case SIOCSIFMEDIA:
2213 error = EINVAL;
2214 break;
2215
2216 case SIOCSIFMTU:
2217 /*
2218 * Set the interface MTU.
2219 */
2220 VLAN_SLOCK();
2221 trunk = TRUNK(ifv);
2222 if (trunk != NULL) {
2223 TRUNK_WLOCK(trunk);
2224 if (ifr->ifr_mtu >
2225 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) ||
2226 ifr->ifr_mtu <
2227 (ifv->ifv_mintu - ifv->ifv_mtufudge))
2228 error = EINVAL;
2229 else
2230 ifp->if_mtu = ifr->ifr_mtu;
2231 TRUNK_WUNLOCK(trunk);
2232 } else
2233 error = EINVAL;
2234 VLAN_SUNLOCK();
2235 break;
2236
2237 case SIOCSETVLAN:
2238 #ifdef VIMAGE
2239 /*
2240 * XXXRW/XXXBZ: The goal in these checks is to allow a VLAN
2241 * interface to be delegated to a jail without allowing the
2242 * jail to change what underlying interface/VID it is
2243 * associated with. We are not entirely convinced that this
2244 * is the right way to accomplish that policy goal.
2245 */
2246 if (ifp->if_vnet != ifp->if_home_vnet) {
2247 error = EPERM;
2248 break;
2249 }
2250 #endif
2251 error = copyin(ifr_data_get_ptr(ifr), &vlr, sizeof(vlr));
2252 if (error)
2253 break;
2254 if (vlr.vlr_parent[0] == '\0') {
2255 vlan_unconfig(ifp);
2256 break;
2257 }
2258 p = ifunit_ref(vlr.vlr_parent);
2259 if (p == NULL) {
2260 error = ENOENT;
2261 break;
2262 }
2263 if (vlr.vlr_proto == 0)
2264 vlr.vlr_proto = ETHERTYPE_VLAN;
2265 oldmtu = ifp->if_mtu;
2266 error = vlan_config(ifv, p, vlr.vlr_tag, vlr.vlr_proto);
2267 if_rele(p);
2268
2269 /*
2270 * VLAN MTU may change during addition of the vlandev.
2271 * If it did, do network layer specific procedure.
2272 */
2273 if (ifp->if_mtu != oldmtu)
2274 if_notifymtu(ifp);
2275 break;
2276
2277 case SIOCGETVLAN:
2278 #ifdef VIMAGE
2279 if (ifp->if_vnet != ifp->if_home_vnet) {
2280 error = EPERM;
2281 break;
2282 }
2283 #endif
2284 bzero(&vlr, sizeof(vlr));
2285 VLAN_SLOCK();
2286 if (TRUNK(ifv) != NULL) {
2287 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname,
2288 sizeof(vlr.vlr_parent));
2289 vlr.vlr_tag = ifv->ifv_vid;
2290 vlr.vlr_proto = ifv->ifv_proto;
2291 }
2292 VLAN_SUNLOCK();
2293 error = copyout(&vlr, ifr_data_get_ptr(ifr), sizeof(vlr));
2294 break;
2295
2296 case SIOCSIFFLAGS:
2297 /*
2298 * We should propagate selected flags to the parent,
2299 * e.g., promiscuous mode.
2300 */
2301 VLAN_SLOCK();
2302 if (TRUNK(ifv) != NULL)
2303 error = vlan_setflags(ifp, 1);
2304 VLAN_SUNLOCK();
2305 break;
2306
2307 case SIOCADDMULTI:
2308 case SIOCDELMULTI:
2309 /*
2310 * If we don't have a parent, just remember the membership for
2311 * when we do.
2312 *
2313 * XXX We need the rmlock here to avoid sleeping while
2314 * holding in6_multi_mtx.
2315 */
2316 VLAN_XLOCK();
2317 trunk = TRUNK(ifv);
2318 if (trunk != NULL)
2319 error = vlan_setmulti(ifp);
2320 VLAN_XUNLOCK();
2321
2322 break;
2323 case SIOCGVLANPCP:
2324 #ifdef VIMAGE
2325 if (ifp->if_vnet != ifp->if_home_vnet) {
2326 error = EPERM;
2327 break;
2328 }
2329 #endif
2330 ifr->ifr_vlan_pcp = ifv->ifv_pcp;
2331 break;
2332
2333 case SIOCSVLANPCP:
2334 #ifdef VIMAGE
2335 if (ifp->if_vnet != ifp->if_home_vnet) {
2336 error = EPERM;
2337 break;
2338 }
2339 #endif
2340 error = priv_check(curthread, PRIV_NET_SETVLANPCP);
2341 if (error)
2342 break;
2343 if (ifr->ifr_vlan_pcp > VLAN_PCP_MAX) {
2344 error = EINVAL;
2345 break;
2346 }
2347 ifv->ifv_pcp = ifr->ifr_vlan_pcp;
2348 ifp->if_pcp = ifv->ifv_pcp;
2349 /* broadcast event about PCP change */
2350 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_PCP);
2351 break;
2352
2353 case SIOCSIFCAP:
2354 VLAN_SLOCK();
2355 ifv->ifv_capenable = ifr->ifr_reqcap;
2356 trunk = TRUNK(ifv);
2357 if (trunk != NULL) {
2358 struct epoch_tracker et;
2359
2360 NET_EPOCH_ENTER(et);
2361 vlan_capabilities(ifv);
2362 NET_EPOCH_EXIT(et);
2363 }
2364 VLAN_SUNLOCK();
2365 break;
2366
2367 default:
2368 error = EINVAL;
2369 break;
2370 }
2371
2372 return (error);
2373 }
2374
2375 #if defined(KERN_TLS) || defined(RATELIMIT)
2376 static int
vlan_snd_tag_alloc(struct ifnet * ifp,union if_snd_tag_alloc_params * params,struct m_snd_tag ** ppmt)2377 vlan_snd_tag_alloc(struct ifnet *ifp,
2378 union if_snd_tag_alloc_params *params,
2379 struct m_snd_tag **ppmt)
2380 {
2381 struct epoch_tracker et;
2382 const struct if_snd_tag_sw *sw;
2383 struct vlan_snd_tag *vst;
2384 struct ifvlan *ifv;
2385 struct ifnet *parent;
2386 struct m_snd_tag *mst;
2387 int error;
2388
2389 NET_EPOCH_ENTER(et);
2390 ifv = ifp->if_softc;
2391
2392 switch (params->hdr.type) {
2393 #ifdef RATELIMIT
2394 case IF_SND_TAG_TYPE_UNLIMITED:
2395 sw = &vlan_snd_tag_ul_sw;
2396 break;
2397 case IF_SND_TAG_TYPE_RATE_LIMIT:
2398 sw = &vlan_snd_tag_rl_sw;
2399 break;
2400 #endif
2401 #ifdef KERN_TLS
2402 case IF_SND_TAG_TYPE_TLS:
2403 sw = &vlan_snd_tag_tls_sw;
2404 break;
2405 case IF_SND_TAG_TYPE_TLS_RX:
2406 sw = NULL;
2407 if (params->tls_rx.vlan_id != 0)
2408 goto failure;
2409 params->tls_rx.vlan_id = ifv->ifv_vid;
2410 break;
2411 #ifdef RATELIMIT
2412 case IF_SND_TAG_TYPE_TLS_RATE_LIMIT:
2413 sw = &vlan_snd_tag_tls_rl_sw;
2414 break;
2415 #endif
2416 #endif
2417 default:
2418 goto failure;
2419 }
2420
2421 if (ifv->ifv_trunk != NULL)
2422 parent = PARENT(ifv);
2423 else
2424 parent = NULL;
2425 if (parent == NULL)
2426 goto failure;
2427 if_ref(parent);
2428 NET_EPOCH_EXIT(et);
2429
2430 if (sw != NULL) {
2431 vst = malloc(sizeof(*vst), M_VLAN, M_NOWAIT);
2432 if (vst == NULL) {
2433 if_rele(parent);
2434 return (ENOMEM);
2435 }
2436 } else
2437 vst = NULL;
2438
2439 error = m_snd_tag_alloc(parent, params, &mst);
2440 if_rele(parent);
2441 if (error) {
2442 free(vst, M_VLAN);
2443 return (error);
2444 }
2445
2446 if (sw != NULL) {
2447 m_snd_tag_init(&vst->com, ifp, sw);
2448 vst->tag = mst;
2449
2450 *ppmt = &vst->com;
2451 } else
2452 *ppmt = mst;
2453
2454 return (0);
2455 failure:
2456 NET_EPOCH_EXIT(et);
2457 return (EOPNOTSUPP);
2458 }
2459
2460 static struct m_snd_tag *
vlan_next_snd_tag(struct m_snd_tag * mst)2461 vlan_next_snd_tag(struct m_snd_tag *mst)
2462 {
2463 struct vlan_snd_tag *vst;
2464
2465 vst = mst_to_vst(mst);
2466 return (vst->tag);
2467 }
2468
2469 static int
vlan_snd_tag_modify(struct m_snd_tag * mst,union if_snd_tag_modify_params * params)2470 vlan_snd_tag_modify(struct m_snd_tag *mst,
2471 union if_snd_tag_modify_params *params)
2472 {
2473 struct vlan_snd_tag *vst;
2474
2475 vst = mst_to_vst(mst);
2476 return (vst->tag->sw->snd_tag_modify(vst->tag, params));
2477 }
2478
2479 static int
vlan_snd_tag_query(struct m_snd_tag * mst,union if_snd_tag_query_params * params)2480 vlan_snd_tag_query(struct m_snd_tag *mst,
2481 union if_snd_tag_query_params *params)
2482 {
2483 struct vlan_snd_tag *vst;
2484
2485 vst = mst_to_vst(mst);
2486 return (vst->tag->sw->snd_tag_query(vst->tag, params));
2487 }
2488
2489 static void
vlan_snd_tag_free(struct m_snd_tag * mst)2490 vlan_snd_tag_free(struct m_snd_tag *mst)
2491 {
2492 struct vlan_snd_tag *vst;
2493
2494 vst = mst_to_vst(mst);
2495 m_snd_tag_rele(vst->tag);
2496 free(vst, M_VLAN);
2497 }
2498
2499 static void
vlan_ratelimit_query(struct ifnet * ifp __unused,struct if_ratelimit_query_results * q)2500 vlan_ratelimit_query(struct ifnet *ifp __unused, struct if_ratelimit_query_results *q)
2501 {
2502 /*
2503 * For vlan, we have an indirect
2504 * interface. The caller needs to
2505 * get a ratelimit tag on the actual
2506 * interface the flow will go on.
2507 */
2508 q->rate_table = NULL;
2509 q->flags = RT_IS_INDIRECT;
2510 q->max_flows = 0;
2511 q->number_of_rates = 0;
2512 }
2513
2514 #endif
2515