2 * Copyright 1998 Massachusetts Institute of Technology
3 * Copyright 2012 ADARA Networks, Inc.
4 * Copyright 2017 Dell EMC Isilon
6 * Portions of this software were developed by Robert N. M. Watson under
7 * contract to ADARA Networks, Inc.
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
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
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.
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
50 #include "opt_ratelimit.h"
52 #include <sys/param.h>
53 #include <sys/eventhandler.h>
54 #include <sys/kernel.h>
56 #include <sys/malloc.h>
58 #include <sys/module.h>
59 #include <sys/rmlock.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>
67 #include <sys/taskqueue.h>
70 #include <net/ethernet.h>
72 #include <net/if_var.h>
73 #include <net/if_clone.h>
74 #include <net/if_dl.h>
75 #include <net/if_types.h>
76 #include <net/if_vlan_var.h>
80 #include <netinet/in.h>
81 #include <netinet/if_ether.h>
84 #define VLAN_DEF_HWIDTH 4
85 #define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST)
87 #define UP_AND_RUNNING(ifp) \
88 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING)
90 CK_SLIST_HEAD(ifvlanhead, ifvlan);
93 struct ifnet *parent; /* parent interface of this trunk */
96 #define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1)
97 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */
99 struct ifvlanhead *hash; /* dynamic hash-list table */
107 * This macro provides a facility to iterate over every vlan on a trunk with
108 * the assumption that none will be added/removed during iteration.
111 #define VLAN_FOREACH(_ifv, _trunk) \
113 for (_i = 0; _i < VLAN_ARRAY_SIZE; _i++) \
114 if (((_ifv) = (_trunk)->vlans[_i]) != NULL)
115 #else /* VLAN_ARRAY */
116 #define VLAN_FOREACH(_ifv, _trunk) \
117 struct ifvlan *_next; \
119 for (_i = 0; _i < (1 << (_trunk)->hwidth); _i++) \
120 CK_SLIST_FOREACH_SAFE((_ifv), &(_trunk)->hash[_i], ifv_list, _next)
121 #endif /* VLAN_ARRAY */
124 * This macro provides a facility to iterate over every vlan on a trunk while
125 * also modifying the number of vlans on the trunk. The iteration continues
126 * until some condition is met or there are no more vlans on the trunk.
129 /* The VLAN_ARRAY case is simple -- just a for loop using the condition. */
130 #define VLAN_FOREACH_UNTIL_SAFE(_ifv, _trunk, _cond) \
132 for (_i = 0; !(_cond) && _i < VLAN_ARRAY_SIZE; _i++) \
133 if (((_ifv) = (_trunk)->vlans[_i]))
134 #else /* VLAN_ARRAY */
136 * The hash table case is more complicated. We allow for the hash table to be
137 * modified (i.e. vlans removed) while we are iterating over it. To allow for
138 * this we must restart the iteration every time we "touch" something during
139 * the iteration, since removal will resize the hash table and invalidate our
140 * current position. If acting on the touched element causes the trunk to be
141 * emptied, then iteration also stops.
143 #define VLAN_FOREACH_UNTIL_SAFE(_ifv, _trunk, _cond) \
145 bool _touch = false; \
147 !(_cond) && _i < (1 << (_trunk)->hwidth); \
148 _i = (_touch && ((_trunk) != NULL) ? 0 : _i + 1), _touch = false) \
149 if (((_ifv) = CK_SLIST_FIRST(&(_trunk)->hash[_i])) != NULL && \
151 #endif /* VLAN_ARRAY */
153 struct vlan_mc_entry {
154 struct sockaddr_dl mc_addr;
155 CK_SLIST_ENTRY(vlan_mc_entry) mc_entries;
156 struct epoch_context mc_epoch_ctx;
160 struct ifvlantrunk *ifv_trunk;
161 struct ifnet *ifv_ifp;
162 #define TRUNK(ifv) ((ifv)->ifv_trunk)
163 #define PARENT(ifv) ((ifv)->ifv_trunk->parent)
165 int ifv_pflags; /* special flags we have set on parent */
168 int ifvm_encaplen; /* encapsulation length */
169 int ifvm_mtufudge; /* MTU fudged by this much */
170 int ifvm_mintu; /* min transmission unit */
171 uint16_t ifvm_proto; /* encapsulation ethertype */
172 uint16_t ifvm_tag; /* tag to apply on packets leaving if */
173 uint16_t ifvm_vid; /* VLAN ID */
174 uint8_t ifvm_pcp; /* Priority Code Point (PCP). */
176 struct task lladdr_task;
177 CK_SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead;
179 CK_SLIST_ENTRY(ifvlan) ifv_list;
182 #define ifv_proto ifv_mib.ifvm_proto
183 #define ifv_tag ifv_mib.ifvm_tag
184 #define ifv_vid ifv_mib.ifvm_vid
185 #define ifv_pcp ifv_mib.ifvm_pcp
186 #define ifv_encaplen ifv_mib.ifvm_encaplen
187 #define ifv_mtufudge ifv_mib.ifvm_mtufudge
188 #define ifv_mintu ifv_mib.ifvm_mintu
190 /* Special flags we should propagate to parent. */
193 int (*func)(struct ifnet *, int);
195 {IFF_PROMISC, ifpromisc},
196 {IFF_ALLMULTI, if_allmulti},
200 extern int vlan_mtag_pcp;
202 static const char vlanname[] = "vlan";
203 static MALLOC_DEFINE(M_VLAN, vlanname, "802.1Q Virtual LAN Interface");
205 static eventhandler_tag ifdetach_tag;
206 static eventhandler_tag iflladdr_tag;
209 * if_vlan uses two module-level synchronizations primitives to allow concurrent
210 * modification of vlan interfaces and (mostly) allow for vlans to be destroyed
211 * while they are being used for tx/rx. To accomplish this in a way that has
212 * acceptable performance and cooperation with other parts of the network stack
213 * there is a non-sleepable epoch(9) and an sx(9).
215 * The performance-sensitive paths that warrant using the epoch(9) are
216 * vlan_transmit and vlan_input. Both have to check for the vlan interface's
217 * existence using if_vlantrunk, and being in the network tx/rx paths the use
218 * of an epoch(9) gives a measureable improvement in performance.
220 * The reason for having an sx(9) is mostly because there are still areas that
221 * must be sleepable and also have safe concurrent access to a vlan interface.
222 * Since the sx(9) exists, it is used by default in most paths unless sleeping
223 * is not permitted, or if it is not clear whether sleeping is permitted.
226 #define _VLAN_SX_ID ifv_sx
228 static struct sx _VLAN_SX_ID;
230 #define VLAN_LOCKING_INIT() \
231 sx_init(&_VLAN_SX_ID, "vlan_sx")
233 #define VLAN_LOCKING_DESTROY() \
234 sx_destroy(&_VLAN_SX_ID)
236 #define VLAN_RLOCK() NET_EPOCH_ENTER();
237 #define VLAN_RUNLOCK() NET_EPOCH_EXIT();
238 #define VLAN_RLOCK_ASSERT() MPASS(in_epoch(net_epoch_preempt))
240 #define VLAN_SLOCK() sx_slock(&_VLAN_SX_ID)
241 #define VLAN_SUNLOCK() sx_sunlock(&_VLAN_SX_ID)
242 #define VLAN_XLOCK() sx_xlock(&_VLAN_SX_ID)
243 #define VLAN_XUNLOCK() sx_xunlock(&_VLAN_SX_ID)
244 #define VLAN_SLOCK_ASSERT() sx_assert(&_VLAN_SX_ID, SA_SLOCKED)
245 #define VLAN_XLOCK_ASSERT() sx_assert(&_VLAN_SX_ID, SA_XLOCKED)
246 #define VLAN_SXLOCK_ASSERT() sx_assert(&_VLAN_SX_ID, SA_LOCKED)
250 * We also have a per-trunk mutex that should be acquired when changing
253 #define TRUNK_LOCK_INIT(trunk) mtx_init(&(trunk)->lock, vlanname, NULL, MTX_DEF)
254 #define TRUNK_LOCK_DESTROY(trunk) mtx_destroy(&(trunk)->lock)
255 #define TRUNK_RLOCK(trunk) NET_EPOCH_ENTER()
256 #define TRUNK_WLOCK(trunk) mtx_lock(&(trunk)->lock)
257 #define TRUNK_RUNLOCK(trunk) NET_EPOCH_EXIT();
258 #define TRUNK_WUNLOCK(trunk) mtx_unlock(&(trunk)->lock)
259 #define TRUNK_RLOCK_ASSERT(trunk) MPASS(in_epoch(net_epoch_preempt))
260 #define TRUNK_LOCK_ASSERT(trunk) MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(trunk)->lock))
261 #define TRUNK_WLOCK_ASSERT(trunk) mtx_assert(&(trunk)->lock, MA_OWNED);
264 * The VLAN_ARRAY substitutes the dynamic hash with a static array
265 * with 4096 entries. In theory this can give a boost in processing,
266 * however in practice it does not. Probably this is because the array
267 * is too big to fit into CPU cache.
270 static void vlan_inithash(struct ifvlantrunk *trunk);
271 static void vlan_freehash(struct ifvlantrunk *trunk);
272 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
273 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
274 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch);
275 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk,
278 static void trunk_destroy(struct ifvlantrunk *trunk);
280 static void vlan_init(void *foo);
281 static void vlan_input(struct ifnet *ifp, struct mbuf *m);
282 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr);
284 static int vlan_snd_tag_alloc(struct ifnet *,
285 union if_snd_tag_alloc_params *, struct m_snd_tag **);
287 static void vlan_qflush(struct ifnet *ifp);
288 static int vlan_setflag(struct ifnet *ifp, int flag, int status,
289 int (*func)(struct ifnet *, int));
290 static int vlan_setflags(struct ifnet *ifp, int status);
291 static int vlan_setmulti(struct ifnet *ifp);
292 static int vlan_transmit(struct ifnet *ifp, struct mbuf *m);
293 static void vlan_unconfig(struct ifnet *ifp);
294 static void vlan_unconfig_locked(struct ifnet *ifp, int departing);
295 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag);
296 static void vlan_link_state(struct ifnet *ifp);
297 static void vlan_capabilities(struct ifvlan *ifv);
298 static void vlan_trunk_capabilities(struct ifnet *ifp);
300 static struct ifnet *vlan_clone_match_ethervid(const char *, int *);
301 static int vlan_clone_match(struct if_clone *, const char *);
302 static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t);
303 static int vlan_clone_destroy(struct if_clone *, struct ifnet *);
305 static void vlan_ifdetach(void *arg, struct ifnet *ifp);
306 static void vlan_iflladdr(void *arg, struct ifnet *ifp);
308 static void vlan_lladdr_fn(void *arg, int pending);
310 static struct if_clone *vlan_cloner;
313 VNET_DEFINE_STATIC(struct if_clone *, vlan_cloner);
314 #define V_vlan_cloner VNET(vlan_cloner)
318 vlan_mc_free(struct epoch_context *ctx)
320 struct vlan_mc_entry *mc = __containerof(ctx, struct vlan_mc_entry, mc_epoch_ctx);
325 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m))
328 vlan_inithash(struct ifvlantrunk *trunk)
333 * The trunk must not be locked here since we call malloc(M_WAITOK).
334 * It is OK in case this function is called before the trunk struct
335 * gets hooked up and becomes visible from other threads.
338 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL,
339 ("%s: hash already initialized", __func__));
341 trunk->hwidth = VLAN_DEF_HWIDTH;
342 n = 1 << trunk->hwidth;
343 trunk->hmask = n - 1;
344 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK);
345 for (i = 0; i < n; i++)
346 CK_SLIST_INIT(&trunk->hash[i]);
350 vlan_freehash(struct ifvlantrunk *trunk)
355 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
356 for (i = 0; i < (1 << trunk->hwidth); i++)
357 KASSERT(CK_SLIST_EMPTY(&trunk->hash[i]),
358 ("%s: hash table not empty", __func__));
360 free(trunk->hash, M_VLAN);
362 trunk->hwidth = trunk->hmask = 0;
366 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
372 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
374 b = 1 << trunk->hwidth;
375 i = HASH(ifv->ifv_vid, trunk->hmask);
376 CK_SLIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
377 if (ifv->ifv_vid == ifv2->ifv_vid)
381 * Grow the hash when the number of vlans exceeds half of the number of
382 * hash buckets squared. This will make the average linked-list length
385 if (trunk->refcnt > (b * b) / 2) {
386 vlan_growhash(trunk, 1);
387 i = HASH(ifv->ifv_vid, trunk->hmask);
389 CK_SLIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list);
396 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
402 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
404 b = 1 << trunk->hwidth;
405 i = HASH(ifv->ifv_vid, trunk->hmask);
406 CK_SLIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
409 CK_SLIST_REMOVE(&trunk->hash[i], ifv2, ifvlan, ifv_list);
410 if (trunk->refcnt < (b * b) / 2)
411 vlan_growhash(trunk, -1);
415 panic("%s: vlan not found\n", __func__);
416 return (ENOENT); /*NOTREACHED*/
420 * Grow the hash larger or smaller if memory permits.
423 vlan_growhash(struct ifvlantrunk *trunk, int howmuch)
426 struct ifvlanhead *hash2;
427 int hwidth2, i, j, n, n2;
430 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
433 /* Harmless yet obvious coding error */
434 printf("%s: howmuch is 0\n", __func__);
438 hwidth2 = trunk->hwidth + howmuch;
439 n = 1 << trunk->hwidth;
441 /* Do not shrink the table below the default */
442 if (hwidth2 < VLAN_DEF_HWIDTH)
445 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_WAITOK);
447 printf("%s: out of memory -- hash size not changed\n",
449 return; /* We can live with the old hash table */
451 for (j = 0; j < n2; j++)
452 CK_SLIST_INIT(&hash2[j]);
453 for (i = 0; i < n; i++)
454 while ((ifv = CK_SLIST_FIRST(&trunk->hash[i])) != NULL) {
455 CK_SLIST_REMOVE(&trunk->hash[i], ifv, ifvlan, ifv_list);
456 j = HASH(ifv->ifv_vid, n2 - 1);
457 CK_SLIST_INSERT_HEAD(&hash2[j], ifv, ifv_list);
460 free(trunk->hash, M_VLAN);
462 trunk->hwidth = hwidth2;
463 trunk->hmask = n2 - 1;
466 if_printf(trunk->parent,
467 "VLAN hash table resized from %d to %d buckets\n", n, n2);
470 static __inline struct ifvlan *
471 vlan_gethash(struct ifvlantrunk *trunk, uint16_t vid)
475 TRUNK_RLOCK_ASSERT(trunk);
477 CK_SLIST_FOREACH(ifv, &trunk->hash[HASH(vid, trunk->hmask)], ifv_list)
478 if (ifv->ifv_vid == vid)
484 /* Debugging code to view the hashtables. */
486 vlan_dumphash(struct ifvlantrunk *trunk)
491 for (i = 0; i < (1 << trunk->hwidth); i++) {
493 CK_SLIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
494 printf("%s ", ifv->ifv_ifp->if_xname);
501 static __inline struct ifvlan *
502 vlan_gethash(struct ifvlantrunk *trunk, uint16_t vid)
505 return trunk->vlans[vid];
509 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
512 if (trunk->vlans[ifv->ifv_vid] != NULL)
514 trunk->vlans[ifv->ifv_vid] = ifv;
521 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
524 trunk->vlans[ifv->ifv_vid] = NULL;
531 vlan_freehash(struct ifvlantrunk *trunk)
536 vlan_inithash(struct ifvlantrunk *trunk)
540 #endif /* !VLAN_ARRAY */
543 trunk_destroy(struct ifvlantrunk *trunk)
547 vlan_freehash(trunk);
548 trunk->parent->if_vlantrunk = NULL;
549 TRUNK_LOCK_DESTROY(trunk);
550 if_rele(trunk->parent);
555 * Program our multicast filter. What we're actually doing is
556 * programming the multicast filter of the parent. This has the
557 * side effect of causing the parent interface to receive multicast
558 * traffic that it doesn't really want, which ends up being discarded
559 * later by the upper protocol layers. Unfortunately, there's no way
560 * to avoid this: there really is only one physical interface.
563 vlan_setmulti(struct ifnet *ifp)
566 struct ifmultiaddr *ifma;
568 struct vlan_mc_entry *mc;
573 /* Find the parent. */
577 CURVNET_SET_QUIET(ifp_p->if_vnet);
579 /* First, remove any existing filter entries. */
580 while ((mc = CK_SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) {
581 CK_SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries);
582 (void)if_delmulti(ifp_p, (struct sockaddr *)&mc->mc_addr);
583 epoch_call(net_epoch_preempt, &mc->mc_epoch_ctx, vlan_mc_free);
586 /* Now program new ones. */
588 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
589 if (ifma->ifma_addr->sa_family != AF_LINK)
591 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT);
593 IF_ADDR_WUNLOCK(ifp);
596 bcopy(ifma->ifma_addr, &mc->mc_addr, ifma->ifma_addr->sa_len);
597 mc->mc_addr.sdl_index = ifp_p->if_index;
598 CK_SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries);
600 IF_ADDR_WUNLOCK(ifp);
601 CK_SLIST_FOREACH (mc, &sc->vlan_mc_listhead, mc_entries) {
602 error = if_addmulti(ifp_p, (struct sockaddr *)&mc->mc_addr,
613 * A handler for parent interface link layer address changes.
614 * If the parent interface link layer address is changed we
615 * should also change it on all children vlans.
618 vlan_iflladdr(void *arg __unused, struct ifnet *ifp)
621 struct ifnet *ifv_ifp;
622 struct ifvlantrunk *trunk;
623 struct sockaddr_dl *sdl;
625 /* Need the rmlock since this is run on taskqueue_swi. */
627 trunk = ifp->if_vlantrunk;
634 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it.
635 * We need an exclusive lock here to prevent concurrent SIOCSIFLLADDR
636 * ioctl calls on the parent garbling the lladdr of the child vlan.
639 VLAN_FOREACH(ifv, trunk) {
641 * Copy new new lladdr into the ifv_ifp, enqueue a task
642 * to actually call if_setlladdr. if_setlladdr needs to
643 * be deferred to a taskqueue because it will call into
644 * the if_vlan ioctl path and try to acquire the global
647 ifv_ifp = ifv->ifv_ifp;
648 bcopy(IF_LLADDR(ifp), IF_LLADDR(ifv_ifp),
650 sdl = (struct sockaddr_dl *)ifv_ifp->if_addr->ifa_addr;
651 sdl->sdl_alen = ifp->if_addrlen;
652 taskqueue_enqueue(taskqueue_thread, &ifv->lladdr_task);
654 TRUNK_WUNLOCK(trunk);
659 * A handler for network interface departure events.
660 * Track departure of trunks here so that we don't access invalid
661 * pointers or whatever if a trunk is ripped from under us, e.g.,
662 * by ejecting its hot-plug card. However, if an ifnet is simply
663 * being renamed, then there's no need to tear down the state.
666 vlan_ifdetach(void *arg __unused, struct ifnet *ifp)
669 struct ifvlantrunk *trunk;
671 /* If the ifnet is just being renamed, don't do anything. */
672 if (ifp->if_flags & IFF_RENAMING)
675 trunk = ifp->if_vlantrunk;
682 * OK, it's a trunk. Loop over and detach all vlan's on it.
683 * Check trunk pointer after each vlan_unconfig() as it will
684 * free it and set to NULL after the last vlan was detached.
686 VLAN_FOREACH_UNTIL_SAFE(ifv, ifp->if_vlantrunk,
687 ifp->if_vlantrunk == NULL)
688 vlan_unconfig_locked(ifv->ifv_ifp, 1);
690 /* Trunk should have been destroyed in vlan_unconfig(). */
691 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__));
696 * Return the trunk device for a virtual interface.
698 static struct ifnet *
699 vlan_trunkdev(struct ifnet *ifp)
703 if (ifp->if_type != IFT_L2VLAN)
716 * Return the 12-bit VLAN VID for this interface, for use by external
717 * components such as Infiniband.
719 * XXXRW: Note that the function name here is historical; it should be named
723 vlan_tag(struct ifnet *ifp, uint16_t *vidp)
727 if (ifp->if_type != IFT_L2VLAN)
730 *vidp = ifv->ifv_vid;
735 vlan_pcp(struct ifnet *ifp, uint16_t *pcpp)
739 if (ifp->if_type != IFT_L2VLAN)
742 *pcpp = ifv->ifv_pcp;
747 * Return a driver specific cookie for this interface. Synchronization
748 * with setcookie must be provided by the driver.
751 vlan_cookie(struct ifnet *ifp)
755 if (ifp->if_type != IFT_L2VLAN)
758 return (ifv->ifv_cookie);
762 * Store a cookie in our softc that drivers can use to store driver
763 * private per-instance data in.
766 vlan_setcookie(struct ifnet *ifp, void *cookie)
770 if (ifp->if_type != IFT_L2VLAN)
773 ifv->ifv_cookie = cookie;
778 * Return the vlan device present at the specific VID.
780 static struct ifnet *
781 vlan_devat(struct ifnet *ifp, uint16_t vid)
783 struct ifvlantrunk *trunk;
787 trunk = ifp->if_vlantrunk;
793 ifv = vlan_gethash(trunk, vid);
801 * Recalculate the cached VLAN tag exposed via the MIB.
804 vlan_tag_recalculate(struct ifvlan *ifv)
807 ifv->ifv_tag = EVL_MAKETAG(ifv->ifv_vid, ifv->ifv_pcp, 0);
811 * VLAN support can be loaded as a module. The only place in the
812 * system that's intimately aware of this is ether_input. We hook
813 * into this code through vlan_input_p which is defined there and
814 * set here. No one else in the system should be aware of this so
815 * we use an explicit reference here.
817 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *);
819 /* For if_link_state_change() eyes only... */
820 extern void (*vlan_link_state_p)(struct ifnet *);
823 vlan_modevent(module_t mod, int type, void *data)
828 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
829 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
830 if (ifdetach_tag == NULL)
832 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event,
833 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
834 if (iflladdr_tag == NULL)
837 vlan_input_p = vlan_input;
838 vlan_link_state_p = vlan_link_state;
839 vlan_trunk_cap_p = vlan_trunk_capabilities;
840 vlan_trunkdev_p = vlan_trunkdev;
841 vlan_cookie_p = vlan_cookie;
842 vlan_setcookie_p = vlan_setcookie;
843 vlan_tag_p = vlan_tag;
844 vlan_pcp_p = vlan_pcp;
845 vlan_devat_p = vlan_devat;
847 vlan_cloner = if_clone_advanced(vlanname, 0, vlan_clone_match,
848 vlan_clone_create, vlan_clone_destroy);
851 printf("vlan: initialized, using "
855 "hash tables with chaining"
862 if_clone_detach(vlan_cloner);
864 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag);
865 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag);
867 vlan_link_state_p = NULL;
868 vlan_trunk_cap_p = NULL;
869 vlan_trunkdev_p = NULL;
871 vlan_cookie_p = NULL;
872 vlan_setcookie_p = NULL;
874 VLAN_LOCKING_DESTROY();
876 printf("vlan: unloaded\n");
884 static moduledata_t vlan_mod = {
890 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
891 MODULE_VERSION(if_vlan, 3);
895 vnet_vlan_init(const void *unused __unused)
898 vlan_cloner = if_clone_advanced(vlanname, 0, vlan_clone_match,
899 vlan_clone_create, vlan_clone_destroy);
900 V_vlan_cloner = vlan_cloner;
902 VNET_SYSINIT(vnet_vlan_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
903 vnet_vlan_init, NULL);
906 vnet_vlan_uninit(const void *unused __unused)
909 if_clone_detach(V_vlan_cloner);
911 VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST,
912 vnet_vlan_uninit, NULL);
916 * Check for <etherif>.<vlan> style interface names.
918 static struct ifnet *
919 vlan_clone_match_ethervid(const char *name, int *vidp)
921 char ifname[IFNAMSIZ];
926 strlcpy(ifname, name, IFNAMSIZ);
927 if ((cp = strchr(ifname, '.')) == NULL)
930 if ((ifp = ifunit_ref(ifname)) == NULL)
938 for(; *cp >= '0' && *cp <= '9'; cp++)
939 vid = (vid * 10) + (*cp - '0');
951 vlan_clone_match(struct if_clone *ifc, const char *name)
955 if (vlan_clone_match_ethervid(name, NULL) != NULL)
958 if (strncmp(vlanname, name, strlen(vlanname)) != 0)
960 for (cp = name + 4; *cp != '\0'; cp++) {
961 if (*cp < '0' || *cp > '9')
969 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
980 struct sockaddr_dl *sdl;
982 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
985 * There are 3 (ugh) ways to specify the cloned device:
986 * o pass a parameter block with the clone request.
987 * o specify parameters in the text of the clone device name
988 * o specify no parameters and get an unattached device that
989 * must be configured separately.
990 * The first technique is preferred; the latter two are
991 * supported for backwards compatibility.
993 * XXXRW: Note historic use of the word "tag" here. New ioctls may be
997 error = copyin(params, &vlr, sizeof(vlr));
1000 p = ifunit_ref(vlr.vlr_parent);
1003 error = ifc_name2unit(name, &unit);
1009 wildcard = (unit < 0);
1010 } else if ((p = vlan_clone_match_ethervid(name, &vid)) != NULL) {
1015 error = ifc_name2unit(name, &unit);
1019 wildcard = (unit < 0);
1022 error = ifc_alloc_unit(ifc, &unit);
1029 /* In the wildcard case, we need to update the name. */
1031 for (dp = name; *dp != '\0'; dp++);
1032 if (snprintf(dp, len - (dp-name), "%d", unit) >
1033 len - (dp-name) - 1) {
1034 panic("%s: interface name too long", __func__);
1038 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO);
1039 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER);
1041 ifc_free_unit(ifc, unit);
1047 CK_SLIST_INIT(&ifv->vlan_mc_listhead);
1048 ifp->if_softc = ifv;
1050 * Set the name manually rather than using if_initname because
1051 * we don't conform to the default naming convention for interfaces.
1053 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1054 ifp->if_dname = vlanname;
1055 ifp->if_dunit = unit;
1056 /* NB: flags are not set here */
1057 ifp->if_linkmib = &ifv->ifv_mib;
1058 ifp->if_linkmiblen = sizeof(ifv->ifv_mib);
1059 /* NB: mtu is not set here */
1061 ifp->if_init = vlan_init;
1062 ifp->if_transmit = vlan_transmit;
1063 ifp->if_qflush = vlan_qflush;
1064 ifp->if_ioctl = vlan_ioctl;
1066 ifp->if_snd_tag_alloc = vlan_snd_tag_alloc;
1068 ifp->if_flags = VLAN_IFFLAGS;
1069 ether_ifattach(ifp, eaddr);
1070 /* Now undo some of the damage... */
1071 ifp->if_baudrate = 0;
1072 ifp->if_type = IFT_L2VLAN;
1073 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN;
1075 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1076 sdl->sdl_type = IFT_L2VLAN;
1079 error = vlan_config(ifv, p, vid);
1083 * Since we've partially failed, we need to back
1084 * out all the way, otherwise userland could get
1085 * confused. Thus, we destroy the interface.
1087 ether_ifdetach(ifp);
1090 ifc_free_unit(ifc, unit);
1101 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
1103 struct ifvlan *ifv = ifp->if_softc;
1104 int unit = ifp->if_dunit;
1106 ether_ifdetach(ifp); /* first, remove it from system-wide lists */
1107 vlan_unconfig(ifp); /* now it can be unconfigured and freed */
1109 * We should have the only reference to the ifv now, so we can now
1110 * drain any remaining lladdr task before freeing the ifnet and the
1113 taskqueue_drain(taskqueue_thread, &ifv->lladdr_task);
1117 ifc_free_unit(ifc, unit);
1123 * The ifp->if_init entry point for vlan(4) is a no-op.
1126 vlan_init(void *foo __unused)
1131 * The if_transmit method for vlan(4) interface.
1134 vlan_transmit(struct ifnet *ifp, struct mbuf *m)
1138 int error, len, mcast;
1141 ifv = ifp->if_softc;
1142 if (TRUNK(ifv) == NULL) {
1143 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1149 len = m->m_pkthdr.len;
1150 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0;
1155 * Do not run parent's if_transmit() if the parent is not up,
1156 * or parent's driver will cause a system crash.
1158 if (!UP_AND_RUNNING(p)) {
1159 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1165 if (!ether_8021q_frame(&m, ifp, p, ifv->ifv_vid, ifv->ifv_pcp)) {
1166 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1172 * Send it, precisely as ether_output() would have.
1174 error = (p->if_transmit)(p, m);
1176 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
1177 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
1178 if_inc_counter(ifp, IFCOUNTER_OMCASTS, mcast);
1180 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1186 * The ifp->if_qflush entry point for vlan(4) is a no-op.
1189 vlan_qflush(struct ifnet *ifp __unused)
1194 vlan_input(struct ifnet *ifp, struct mbuf *m)
1196 struct ifvlantrunk *trunk;
1202 trunk = ifp->if_vlantrunk;
1203 if (trunk == NULL) {
1209 if (m->m_flags & M_VLANTAG) {
1211 * Packet is tagged, but m contains a normal
1212 * Ethernet frame; the tag is stored out-of-band.
1214 tag = m->m_pkthdr.ether_vtag;
1215 m->m_flags &= ~M_VLANTAG;
1217 struct ether_vlan_header *evl;
1220 * Packet is tagged in-band as specified by 802.1q.
1222 switch (ifp->if_type) {
1224 if (m->m_len < sizeof(*evl) &&
1225 (m = m_pullup(m, sizeof(*evl))) == NULL) {
1226 if_printf(ifp, "cannot pullup VLAN header\n");
1230 evl = mtod(m, struct ether_vlan_header *);
1231 tag = ntohs(evl->evl_tag);
1234 * Remove the 802.1q header by copying the Ethernet
1235 * addresses over it and adjusting the beginning of
1236 * the data in the mbuf. The encapsulated Ethernet
1237 * type field is already in place.
1239 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
1240 ETHER_HDR_LEN - ETHER_TYPE_LEN);
1241 m_adj(m, ETHER_VLAN_ENCAP_LEN);
1246 panic("%s: %s has unsupported if_type %u",
1247 __func__, ifp->if_xname, ifp->if_type);
1249 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
1256 vid = EVL_VLANOFTAG(tag);
1258 ifv = vlan_gethash(trunk, vid);
1259 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) {
1261 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
1266 if (vlan_mtag_pcp) {
1268 * While uncommon, it is possible that we will find a 802.1q
1269 * packet encapsulated inside another packet that also had an
1270 * 802.1q header. For example, ethernet tunneled over IPSEC
1271 * arriving over ethernet. In that case, we replace the
1272 * existing 802.1q PCP m_tag value.
1274 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
1276 mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_IN,
1277 sizeof(uint8_t), M_NOWAIT);
1279 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1284 m_tag_prepend(m, mtag);
1286 *(uint8_t *)(mtag + 1) = EVL_PRIOFTAG(tag);
1289 m->m_pkthdr.rcvif = ifv->ifv_ifp;
1290 if_inc_counter(ifv->ifv_ifp, IFCOUNTER_IPACKETS, 1);
1293 /* Pass it back through the parent's input routine. */
1294 (*ifv->ifv_ifp->if_input)(ifv->ifv_ifp, m);
1298 vlan_lladdr_fn(void *arg, int pending __unused)
1303 ifv = (struct ifvlan *)arg;
1306 CURVNET_SET(ifp->if_vnet);
1308 /* The ifv_ifp already has the lladdr copied in. */
1309 if_setlladdr(ifp, IF_LLADDR(ifp), ifp->if_addrlen);
1315 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t vid)
1317 struct ifvlantrunk *trunk;
1322 * We can handle non-ethernet hardware types as long as
1323 * they handle the tagging and headers themselves.
1325 if (p->if_type != IFT_ETHER &&
1326 (p->if_capenable & IFCAP_VLAN_HWTAGGING) == 0)
1327 return (EPROTONOSUPPORT);
1328 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS)
1329 return (EPROTONOSUPPORT);
1331 * Don't let the caller set up a VLAN VID with
1332 * anything except VLID bits.
1333 * VID numbers 0x0 and 0xFFF are reserved.
1335 if (vid == 0 || vid == 0xFFF || (vid & ~EVL_VLID_MASK))
1341 if (p->if_vlantrunk == NULL) {
1342 trunk = malloc(sizeof(struct ifvlantrunk),
1343 M_VLAN, M_WAITOK | M_ZERO);
1344 vlan_inithash(trunk);
1345 TRUNK_LOCK_INIT(trunk);
1347 p->if_vlantrunk = trunk;
1349 if_ref(trunk->parent);
1350 TRUNK_WUNLOCK(trunk);
1352 trunk = p->if_vlantrunk;
1355 ifv->ifv_vid = vid; /* must set this before vlan_inshash() */
1356 ifv->ifv_pcp = 0; /* Default: best effort delivery. */
1357 vlan_tag_recalculate(ifv);
1358 error = vlan_inshash(trunk, ifv);
1361 ifv->ifv_proto = ETHERTYPE_VLAN;
1362 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN;
1363 ifv->ifv_mintu = ETHERMIN;
1364 ifv->ifv_pflags = 0;
1365 ifv->ifv_capenable = -1;
1368 * If the parent supports the VLAN_MTU capability,
1369 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames,
1372 if (p->if_capenable & IFCAP_VLAN_MTU) {
1374 * No need to fudge the MTU since the parent can
1375 * handle extended frames.
1377 ifv->ifv_mtufudge = 0;
1380 * Fudge the MTU by the encapsulation size. This
1381 * makes us incompatible with strictly compliant
1382 * 802.1Q implementations, but allows us to use
1383 * the feature with other NetBSD implementations,
1384 * which might still be useful.
1386 ifv->ifv_mtufudge = ifv->ifv_encaplen;
1389 ifv->ifv_trunk = trunk;
1392 * Initialize fields from our parent. This duplicates some
1393 * work with ether_ifattach() but allows for non-ethernet
1394 * interfaces to also work.
1396 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge;
1397 ifp->if_baudrate = p->if_baudrate;
1398 ifp->if_output = p->if_output;
1399 ifp->if_input = p->if_input;
1400 ifp->if_resolvemulti = p->if_resolvemulti;
1401 ifp->if_addrlen = p->if_addrlen;
1402 ifp->if_broadcastaddr = p->if_broadcastaddr;
1403 ifp->if_pcp = ifv->ifv_pcp;
1406 * Copy only a selected subset of flags from the parent.
1407 * Other flags are none of our business.
1409 #define VLAN_COPY_FLAGS (IFF_SIMPLEX)
1410 ifp->if_flags &= ~VLAN_COPY_FLAGS;
1411 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS;
1412 #undef VLAN_COPY_FLAGS
1414 ifp->if_link_state = p->if_link_state;
1416 TRUNK_RLOCK(TRUNK(ifv));
1417 vlan_capabilities(ifv);
1418 TRUNK_RUNLOCK(TRUNK(ifv));
1421 * Set up our interface address to reflect the underlying
1422 * physical interface's.
1424 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen);
1425 ((struct sockaddr_dl *)ifp->if_addr->ifa_addr)->sdl_alen =
1428 TASK_INIT(&ifv->lladdr_task, 0, vlan_lladdr_fn, ifv);
1430 /* We are ready for operation now. */
1431 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1433 /* Update flags on the parent, if necessary. */
1434 vlan_setflags(ifp, 1);
1437 * Configure multicast addresses that may already be
1438 * joined on the vlan device.
1440 (void)vlan_setmulti(ifp);
1444 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_vid);
1451 vlan_unconfig(struct ifnet *ifp)
1455 vlan_unconfig_locked(ifp, 0);
1460 vlan_unconfig_locked(struct ifnet *ifp, int departing)
1462 struct ifvlantrunk *trunk;
1463 struct vlan_mc_entry *mc;
1465 struct ifnet *parent;
1468 VLAN_XLOCK_ASSERT();
1470 ifv = ifp->if_softc;
1471 trunk = ifv->ifv_trunk;
1474 if (trunk != NULL) {
1475 parent = trunk->parent;
1478 * Since the interface is being unconfigured, we need to
1479 * empty the list of multicast groups that we may have joined
1480 * while we were alive from the parent's list.
1482 while ((mc = CK_SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) {
1484 * If the parent interface is being detached,
1485 * all its multicast addresses have already
1486 * been removed. Warn about errors if
1487 * if_delmulti() does fail, but don't abort as
1488 * all callers expect vlan destruction to
1492 error = if_delmulti(parent,
1493 (struct sockaddr *)&mc->mc_addr);
1496 "Failed to delete multicast address from parent: %d\n",
1499 CK_SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries);
1500 epoch_call(net_epoch_preempt, &mc->mc_epoch_ctx, vlan_mc_free);
1503 vlan_setflags(ifp, 0); /* clear special flags on parent */
1505 vlan_remhash(trunk, ifv);
1506 ifv->ifv_trunk = NULL;
1509 * Check if we were the last.
1511 if (trunk->refcnt == 0) {
1512 parent->if_vlantrunk = NULL;
1514 trunk_destroy(trunk);
1518 /* Disconnect from parent. */
1519 if (ifv->ifv_pflags)
1520 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__);
1521 ifp->if_mtu = ETHERMTU;
1522 ifp->if_link_state = LINK_STATE_UNKNOWN;
1523 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1526 * Only dispatch an event if vlan was
1527 * attached, otherwise there is nothing
1528 * to cleanup anyway.
1531 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_vid);
1534 /* Handle a reference counted flag that should be set on the parent as well */
1536 vlan_setflag(struct ifnet *ifp, int flag, int status,
1537 int (*func)(struct ifnet *, int))
1542 VLAN_SXLOCK_ASSERT();
1544 ifv = ifp->if_softc;
1545 status = status ? (ifp->if_flags & flag) : 0;
1546 /* Now "status" contains the flag value or 0 */
1549 * See if recorded parent's status is different from what
1550 * we want it to be. If it is, flip it. We record parent's
1551 * status in ifv_pflags so that we won't clear parent's flag
1552 * we haven't set. In fact, we don't clear or set parent's
1553 * flags directly, but get or release references to them.
1554 * That's why we can be sure that recorded flags still are
1555 * in accord with actual parent's flags.
1557 if (status != (ifv->ifv_pflags & flag)) {
1558 error = (*func)(PARENT(ifv), status);
1561 ifv->ifv_pflags &= ~flag;
1562 ifv->ifv_pflags |= status;
1568 * Handle IFF_* flags that require certain changes on the parent:
1569 * if "status" is true, update parent's flags respective to our if_flags;
1570 * if "status" is false, forcedly clear the flags set on parent.
1573 vlan_setflags(struct ifnet *ifp, int status)
1577 for (i = 0; vlan_pflags[i].flag; i++) {
1578 error = vlan_setflag(ifp, vlan_pflags[i].flag,
1579 status, vlan_pflags[i].func);
1586 /* Inform all vlans that their parent has changed link state */
1588 vlan_link_state(struct ifnet *ifp)
1590 struct ifvlantrunk *trunk;
1593 /* Called from a taskqueue_swi task, so we cannot sleep. */
1595 trunk = ifp->if_vlantrunk;
1596 if (trunk == NULL) {
1602 VLAN_FOREACH(ifv, trunk) {
1603 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate;
1604 if_link_state_change(ifv->ifv_ifp,
1605 trunk->parent->if_link_state);
1607 TRUNK_WUNLOCK(trunk);
1612 vlan_capabilities(struct ifvlan *ifv)
1616 struct ifnet_hw_tsomax hw_tsomax;
1617 int cap = 0, ena = 0, mena;
1620 VLAN_SXLOCK_ASSERT();
1621 TRUNK_RLOCK_ASSERT(TRUNK(ifv));
1625 /* Mask parent interface enabled capabilities disabled by user. */
1626 mena = p->if_capenable & ifv->ifv_capenable;
1629 * If the parent interface can do checksum offloading
1630 * on VLANs, then propagate its hardware-assisted
1631 * checksumming flags. Also assert that checksum
1632 * offloading requires hardware VLAN tagging.
1634 if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
1635 cap |= p->if_capabilities & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6);
1636 if (p->if_capenable & IFCAP_VLAN_HWCSUM &&
1637 p->if_capenable & IFCAP_VLAN_HWTAGGING) {
1638 ena |= mena & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6);
1639 if (ena & IFCAP_TXCSUM)
1640 hwa |= p->if_hwassist & (CSUM_IP | CSUM_TCP |
1641 CSUM_UDP | CSUM_SCTP);
1642 if (ena & IFCAP_TXCSUM_IPV6)
1643 hwa |= p->if_hwassist & (CSUM_TCP_IPV6 |
1644 CSUM_UDP_IPV6 | CSUM_SCTP_IPV6);
1648 * If the parent interface can do TSO on VLANs then
1649 * propagate the hardware-assisted flag. TSO on VLANs
1650 * does not necessarily require hardware VLAN tagging.
1652 memset(&hw_tsomax, 0, sizeof(hw_tsomax));
1653 if_hw_tsomax_common(p, &hw_tsomax);
1654 if_hw_tsomax_update(ifp, &hw_tsomax);
1655 if (p->if_capabilities & IFCAP_VLAN_HWTSO)
1656 cap |= p->if_capabilities & IFCAP_TSO;
1657 if (p->if_capenable & IFCAP_VLAN_HWTSO) {
1658 ena |= mena & IFCAP_TSO;
1659 if (ena & IFCAP_TSO)
1660 hwa |= p->if_hwassist & CSUM_TSO;
1664 * If the parent interface can do LRO and checksum offloading on
1665 * VLANs, then guess it may do LRO on VLANs. False positive here
1666 * cost nothing, while false negative may lead to some confusions.
1668 if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
1669 cap |= p->if_capabilities & IFCAP_LRO;
1670 if (p->if_capenable & IFCAP_VLAN_HWCSUM)
1671 ena |= p->if_capenable & IFCAP_LRO;
1674 * If the parent interface can offload TCP connections over VLANs then
1675 * propagate its TOE capability to the VLAN interface.
1677 * All TOE drivers in the tree today can deal with VLANs. If this
1678 * changes then IFCAP_VLAN_TOE should be promoted to a full capability
1681 #define IFCAP_VLAN_TOE IFCAP_TOE
1682 if (p->if_capabilities & IFCAP_VLAN_TOE)
1683 cap |= p->if_capabilities & IFCAP_TOE;
1684 if (p->if_capenable & IFCAP_VLAN_TOE) {
1685 TOEDEV(ifp) = TOEDEV(p);
1686 ena |= mena & IFCAP_TOE;
1690 * If the parent interface supports dynamic link state, so does the
1693 cap |= (p->if_capabilities & IFCAP_LINKSTATE);
1694 ena |= (mena & IFCAP_LINKSTATE);
1698 * If the parent interface supports ratelimiting, so does the
1701 cap |= (p->if_capabilities & IFCAP_TXRTLMT);
1702 ena |= (mena & IFCAP_TXRTLMT);
1705 ifp->if_capabilities = cap;
1706 ifp->if_capenable = ena;
1707 ifp->if_hwassist = hwa;
1711 vlan_trunk_capabilities(struct ifnet *ifp)
1713 struct ifvlantrunk *trunk;
1717 trunk = ifp->if_vlantrunk;
1718 if (trunk == NULL) {
1723 VLAN_FOREACH(ifv, trunk) {
1724 vlan_capabilities(ifv);
1726 TRUNK_RUNLOCK(trunk);
1731 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1737 struct ifvlantrunk *trunk;
1741 ifr = (struct ifreq *)data;
1742 ifa = (struct ifaddr *) data;
1743 ifv = ifp->if_softc;
1747 ifp->if_flags |= IFF_UP;
1749 if (ifa->ifa_addr->sa_family == AF_INET)
1750 arp_ifinit(ifp, ifa);
1754 bcopy(IF_LLADDR(ifp), &ifr->ifr_addr.sa_data[0],
1759 if (TRUNK(ifv) != NULL) {
1762 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data);
1764 /* Limit the result to the parent's current config. */
1766 struct ifmediareq *ifmr;
1768 ifmr = (struct ifmediareq *)data;
1769 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) {
1770 ifmr->ifm_count = 1;
1771 error = copyout(&ifmr->ifm_current,
1788 * Set the interface MTU.
1792 if (trunk != NULL) {
1795 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) ||
1797 (ifv->ifv_mintu - ifv->ifv_mtufudge))
1800 ifp->if_mtu = ifr->ifr_mtu;
1801 TRUNK_WUNLOCK(trunk);
1810 * XXXRW/XXXBZ: The goal in these checks is to allow a VLAN
1811 * interface to be delegated to a jail without allowing the
1812 * jail to change what underlying interface/VID it is
1813 * associated with. We are not entirely convinced that this
1814 * is the right way to accomplish that policy goal.
1816 if (ifp->if_vnet != ifp->if_home_vnet) {
1821 error = copyin(ifr_data_get_ptr(ifr), &vlr, sizeof(vlr));
1824 if (vlr.vlr_parent[0] == '\0') {
1828 p = ifunit_ref(vlr.vlr_parent);
1833 error = vlan_config(ifv, p, vlr.vlr_tag);
1839 if (ifp->if_vnet != ifp->if_home_vnet) {
1844 bzero(&vlr, sizeof(vlr));
1846 if (TRUNK(ifv) != NULL) {
1847 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname,
1848 sizeof(vlr.vlr_parent));
1849 vlr.vlr_tag = ifv->ifv_vid;
1852 error = copyout(&vlr, ifr_data_get_ptr(ifr), sizeof(vlr));
1857 * We should propagate selected flags to the parent,
1858 * e.g., promiscuous mode.
1861 if (TRUNK(ifv) != NULL)
1862 error = vlan_setflags(ifp, 1);
1869 * If we don't have a parent, just remember the membership for
1872 * XXX We need the rmlock here to avoid sleeping while
1873 * holding in6_multi_mtx.
1878 error = vlan_setmulti(ifp);
1884 if (ifp->if_vnet != ifp->if_home_vnet) {
1889 ifr->ifr_vlan_pcp = ifv->ifv_pcp;
1894 if (ifp->if_vnet != ifp->if_home_vnet) {
1899 error = priv_check(curthread, PRIV_NET_SETVLANPCP);
1902 if (ifr->ifr_vlan_pcp > 7) {
1906 ifv->ifv_pcp = ifr->ifr_vlan_pcp;
1907 ifp->if_pcp = ifv->ifv_pcp;
1908 vlan_tag_recalculate(ifv);
1909 /* broadcast event about PCP change */
1910 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_PCP);
1915 ifv->ifv_capenable = ifr->ifr_reqcap;
1917 if (trunk != NULL) {
1919 vlan_capabilities(ifv);
1920 TRUNK_RUNLOCK(trunk);
1935 vlan_snd_tag_alloc(struct ifnet *ifp,
1936 union if_snd_tag_alloc_params *params,
1937 struct m_snd_tag **ppmt)
1940 /* get trunk device */
1941 ifp = vlan_trunkdev(ifp);
1942 if (ifp == NULL || (ifp->if_capenable & IFCAP_TXRTLMT) == 0)
1943 return (EOPNOTSUPP);
1944 /* forward allocation request */
1945 return (ifp->if_snd_tag_alloc(ifp, params, ppmt));