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 */
167 int ifv_encaplen; /* encapsulation length */
168 int ifv_mtufudge; /* MTU fudged by this much */
169 int ifv_mintu; /* min transmission unit */
170 uint16_t ifv_proto; /* encapsulation ethertype */
171 uint16_t ifv_tag; /* tag to apply on packets leaving if */
172 uint16_t ifv_vid; /* VLAN ID */
173 uint8_t ifv_pcp; /* Priority Code Point (PCP). */
174 struct task lladdr_task;
175 CK_SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead;
177 CK_SLIST_ENTRY(ifvlan) ifv_list;
181 /* Special flags we should propagate to parent. */
184 int (*func)(struct ifnet *, int);
186 {IFF_PROMISC, ifpromisc},
187 {IFF_ALLMULTI, if_allmulti},
191 extern int vlan_mtag_pcp;
193 static const char vlanname[] = "vlan";
194 static MALLOC_DEFINE(M_VLAN, vlanname, "802.1Q Virtual LAN Interface");
196 static eventhandler_tag ifdetach_tag;
197 static eventhandler_tag iflladdr_tag;
200 * if_vlan uses two module-level synchronizations primitives to allow concurrent
201 * modification of vlan interfaces and (mostly) allow for vlans to be destroyed
202 * while they are being used for tx/rx. To accomplish this in a way that has
203 * acceptable performance and cooperation with other parts of the network stack
204 * there is a non-sleepable epoch(9) and an sx(9).
206 * The performance-sensitive paths that warrant using the epoch(9) are
207 * vlan_transmit and vlan_input. Both have to check for the vlan interface's
208 * existence using if_vlantrunk, and being in the network tx/rx paths the use
209 * of an epoch(9) gives a measureable improvement in performance.
211 * The reason for having an sx(9) is mostly because there are still areas that
212 * must be sleepable and also have safe concurrent access to a vlan interface.
213 * Since the sx(9) exists, it is used by default in most paths unless sleeping
214 * is not permitted, or if it is not clear whether sleeping is permitted.
217 #define _VLAN_SX_ID ifv_sx
219 static struct sx _VLAN_SX_ID;
221 #define VLAN_LOCKING_INIT() \
222 sx_init(&_VLAN_SX_ID, "vlan_sx")
224 #define VLAN_LOCKING_DESTROY() \
225 sx_destroy(&_VLAN_SX_ID)
227 #define VLAN_RLOCK() NET_EPOCH_ENTER();
228 #define VLAN_RUNLOCK() NET_EPOCH_EXIT();
229 #define VLAN_RLOCK_ASSERT() MPASS(in_epoch(net_epoch_preempt))
231 #define VLAN_SLOCK() sx_slock(&_VLAN_SX_ID)
232 #define VLAN_SUNLOCK() sx_sunlock(&_VLAN_SX_ID)
233 #define VLAN_XLOCK() sx_xlock(&_VLAN_SX_ID)
234 #define VLAN_XUNLOCK() sx_xunlock(&_VLAN_SX_ID)
235 #define VLAN_SLOCK_ASSERT() sx_assert(&_VLAN_SX_ID, SA_SLOCKED)
236 #define VLAN_XLOCK_ASSERT() sx_assert(&_VLAN_SX_ID, SA_XLOCKED)
237 #define VLAN_SXLOCK_ASSERT() sx_assert(&_VLAN_SX_ID, SA_LOCKED)
241 * We also have a per-trunk mutex that should be acquired when changing
244 #define TRUNK_LOCK_INIT(trunk) mtx_init(&(trunk)->lock, vlanname, NULL, MTX_DEF)
245 #define TRUNK_LOCK_DESTROY(trunk) mtx_destroy(&(trunk)->lock)
246 #define TRUNK_RLOCK(trunk) NET_EPOCH_ENTER()
247 #define TRUNK_WLOCK(trunk) mtx_lock(&(trunk)->lock)
248 #define TRUNK_RUNLOCK(trunk) NET_EPOCH_EXIT();
249 #define TRUNK_WUNLOCK(trunk) mtx_unlock(&(trunk)->lock)
250 #define TRUNK_RLOCK_ASSERT(trunk) MPASS(in_epoch(net_epoch_preempt))
251 #define TRUNK_LOCK_ASSERT(trunk) MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(trunk)->lock))
252 #define TRUNK_WLOCK_ASSERT(trunk) mtx_assert(&(trunk)->lock, MA_OWNED);
255 * The VLAN_ARRAY substitutes the dynamic hash with a static array
256 * with 4096 entries. In theory this can give a boost in processing,
257 * however in practice it does not. Probably this is because the array
258 * is too big to fit into CPU cache.
261 static void vlan_inithash(struct ifvlantrunk *trunk);
262 static void vlan_freehash(struct ifvlantrunk *trunk);
263 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
264 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
265 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch);
266 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk,
269 static void trunk_destroy(struct ifvlantrunk *trunk);
271 static void vlan_init(void *foo);
272 static void vlan_input(struct ifnet *ifp, struct mbuf *m);
273 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr);
275 static int vlan_snd_tag_alloc(struct ifnet *,
276 union if_snd_tag_alloc_params *, struct m_snd_tag **);
278 static void vlan_qflush(struct ifnet *ifp);
279 static int vlan_setflag(struct ifnet *ifp, int flag, int status,
280 int (*func)(struct ifnet *, int));
281 static int vlan_setflags(struct ifnet *ifp, int status);
282 static int vlan_setmulti(struct ifnet *ifp);
283 static int vlan_transmit(struct ifnet *ifp, struct mbuf *m);
284 static void vlan_unconfig(struct ifnet *ifp);
285 static void vlan_unconfig_locked(struct ifnet *ifp, int departing);
286 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag);
287 static void vlan_link_state(struct ifnet *ifp);
288 static void vlan_capabilities(struct ifvlan *ifv);
289 static void vlan_trunk_capabilities(struct ifnet *ifp);
291 static struct ifnet *vlan_clone_match_ethervid(const char *, int *);
292 static int vlan_clone_match(struct if_clone *, const char *);
293 static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t);
294 static int vlan_clone_destroy(struct if_clone *, struct ifnet *);
296 static void vlan_ifdetach(void *arg, struct ifnet *ifp);
297 static void vlan_iflladdr(void *arg, struct ifnet *ifp);
299 static void vlan_lladdr_fn(void *arg, int pending);
301 static struct if_clone *vlan_cloner;
304 VNET_DEFINE_STATIC(struct if_clone *, vlan_cloner);
305 #define V_vlan_cloner VNET(vlan_cloner)
309 vlan_mc_free(struct epoch_context *ctx)
311 struct vlan_mc_entry *mc = __containerof(ctx, struct vlan_mc_entry, mc_epoch_ctx);
316 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m))
319 vlan_inithash(struct ifvlantrunk *trunk)
324 * The trunk must not be locked here since we call malloc(M_WAITOK).
325 * It is OK in case this function is called before the trunk struct
326 * gets hooked up and becomes visible from other threads.
329 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL,
330 ("%s: hash already initialized", __func__));
332 trunk->hwidth = VLAN_DEF_HWIDTH;
333 n = 1 << trunk->hwidth;
334 trunk->hmask = n - 1;
335 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK);
336 for (i = 0; i < n; i++)
337 CK_SLIST_INIT(&trunk->hash[i]);
341 vlan_freehash(struct ifvlantrunk *trunk)
346 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
347 for (i = 0; i < (1 << trunk->hwidth); i++)
348 KASSERT(CK_SLIST_EMPTY(&trunk->hash[i]),
349 ("%s: hash table not empty", __func__));
351 free(trunk->hash, M_VLAN);
353 trunk->hwidth = trunk->hmask = 0;
357 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
363 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
365 b = 1 << trunk->hwidth;
366 i = HASH(ifv->ifv_vid, trunk->hmask);
367 CK_SLIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
368 if (ifv->ifv_vid == ifv2->ifv_vid)
372 * Grow the hash when the number of vlans exceeds half of the number of
373 * hash buckets squared. This will make the average linked-list length
376 if (trunk->refcnt > (b * b) / 2) {
377 vlan_growhash(trunk, 1);
378 i = HASH(ifv->ifv_vid, trunk->hmask);
380 CK_SLIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list);
387 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
393 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
395 b = 1 << trunk->hwidth;
396 i = HASH(ifv->ifv_vid, trunk->hmask);
397 CK_SLIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
400 CK_SLIST_REMOVE(&trunk->hash[i], ifv2, ifvlan, ifv_list);
401 if (trunk->refcnt < (b * b) / 2)
402 vlan_growhash(trunk, -1);
406 panic("%s: vlan not found\n", __func__);
407 return (ENOENT); /*NOTREACHED*/
411 * Grow the hash larger or smaller if memory permits.
414 vlan_growhash(struct ifvlantrunk *trunk, int howmuch)
417 struct ifvlanhead *hash2;
418 int hwidth2, i, j, n, n2;
421 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
424 /* Harmless yet obvious coding error */
425 printf("%s: howmuch is 0\n", __func__);
429 hwidth2 = trunk->hwidth + howmuch;
430 n = 1 << trunk->hwidth;
432 /* Do not shrink the table below the default */
433 if (hwidth2 < VLAN_DEF_HWIDTH)
436 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_WAITOK);
438 printf("%s: out of memory -- hash size not changed\n",
440 return; /* We can live with the old hash table */
442 for (j = 0; j < n2; j++)
443 CK_SLIST_INIT(&hash2[j]);
444 for (i = 0; i < n; i++)
445 while ((ifv = CK_SLIST_FIRST(&trunk->hash[i])) != NULL) {
446 CK_SLIST_REMOVE(&trunk->hash[i], ifv, ifvlan, ifv_list);
447 j = HASH(ifv->ifv_vid, n2 - 1);
448 CK_SLIST_INSERT_HEAD(&hash2[j], ifv, ifv_list);
451 free(trunk->hash, M_VLAN);
453 trunk->hwidth = hwidth2;
454 trunk->hmask = n2 - 1;
457 if_printf(trunk->parent,
458 "VLAN hash table resized from %d to %d buckets\n", n, n2);
461 static __inline struct ifvlan *
462 vlan_gethash(struct ifvlantrunk *trunk, uint16_t vid)
466 TRUNK_RLOCK_ASSERT(trunk);
468 CK_SLIST_FOREACH(ifv, &trunk->hash[HASH(vid, trunk->hmask)], ifv_list)
469 if (ifv->ifv_vid == vid)
475 /* Debugging code to view the hashtables. */
477 vlan_dumphash(struct ifvlantrunk *trunk)
482 for (i = 0; i < (1 << trunk->hwidth); i++) {
484 CK_SLIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
485 printf("%s ", ifv->ifv_ifp->if_xname);
492 static __inline struct ifvlan *
493 vlan_gethash(struct ifvlantrunk *trunk, uint16_t vid)
496 return trunk->vlans[vid];
500 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
503 if (trunk->vlans[ifv->ifv_vid] != NULL)
505 trunk->vlans[ifv->ifv_vid] = ifv;
512 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
515 trunk->vlans[ifv->ifv_vid] = NULL;
522 vlan_freehash(struct ifvlantrunk *trunk)
527 vlan_inithash(struct ifvlantrunk *trunk)
531 #endif /* !VLAN_ARRAY */
534 trunk_destroy(struct ifvlantrunk *trunk)
538 vlan_freehash(trunk);
539 trunk->parent->if_vlantrunk = NULL;
540 TRUNK_LOCK_DESTROY(trunk);
541 if_rele(trunk->parent);
546 * Program our multicast filter. What we're actually doing is
547 * programming the multicast filter of the parent. This has the
548 * side effect of causing the parent interface to receive multicast
549 * traffic that it doesn't really want, which ends up being discarded
550 * later by the upper protocol layers. Unfortunately, there's no way
551 * to avoid this: there really is only one physical interface.
554 vlan_setmulti(struct ifnet *ifp)
557 struct ifmultiaddr *ifma;
559 struct vlan_mc_entry *mc;
564 /* Find the parent. */
568 CURVNET_SET_QUIET(ifp_p->if_vnet);
570 /* First, remove any existing filter entries. */
571 while ((mc = CK_SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) {
572 CK_SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries);
573 (void)if_delmulti(ifp_p, (struct sockaddr *)&mc->mc_addr);
574 epoch_call(net_epoch_preempt, &mc->mc_epoch_ctx, vlan_mc_free);
577 /* Now program new ones. */
579 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
580 if (ifma->ifma_addr->sa_family != AF_LINK)
582 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT);
584 IF_ADDR_WUNLOCK(ifp);
587 bcopy(ifma->ifma_addr, &mc->mc_addr, ifma->ifma_addr->sa_len);
588 mc->mc_addr.sdl_index = ifp_p->if_index;
589 CK_SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries);
591 IF_ADDR_WUNLOCK(ifp);
592 CK_SLIST_FOREACH (mc, &sc->vlan_mc_listhead, mc_entries) {
593 error = if_addmulti(ifp_p, (struct sockaddr *)&mc->mc_addr,
604 * A handler for parent interface link layer address changes.
605 * If the parent interface link layer address is changed we
606 * should also change it on all children vlans.
609 vlan_iflladdr(void *arg __unused, struct ifnet *ifp)
612 struct ifnet *ifv_ifp;
613 struct ifvlantrunk *trunk;
614 struct sockaddr_dl *sdl;
616 /* Need the rmlock since this is run on taskqueue_swi. */
618 trunk = ifp->if_vlantrunk;
625 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it.
626 * We need an exclusive lock here to prevent concurrent SIOCSIFLLADDR
627 * ioctl calls on the parent garbling the lladdr of the child vlan.
630 VLAN_FOREACH(ifv, trunk) {
632 * Copy new new lladdr into the ifv_ifp, enqueue a task
633 * to actually call if_setlladdr. if_setlladdr needs to
634 * be deferred to a taskqueue because it will call into
635 * the if_vlan ioctl path and try to acquire the global
638 ifv_ifp = ifv->ifv_ifp;
639 bcopy(IF_LLADDR(ifp), IF_LLADDR(ifv_ifp),
641 sdl = (struct sockaddr_dl *)ifv_ifp->if_addr->ifa_addr;
642 sdl->sdl_alen = ifp->if_addrlen;
643 taskqueue_enqueue(taskqueue_thread, &ifv->lladdr_task);
645 TRUNK_WUNLOCK(trunk);
650 * A handler for network interface departure events.
651 * Track departure of trunks here so that we don't access invalid
652 * pointers or whatever if a trunk is ripped from under us, e.g.,
653 * by ejecting its hot-plug card. However, if an ifnet is simply
654 * being renamed, then there's no need to tear down the state.
657 vlan_ifdetach(void *arg __unused, struct ifnet *ifp)
660 struct ifvlantrunk *trunk;
662 /* If the ifnet is just being renamed, don't do anything. */
663 if (ifp->if_flags & IFF_RENAMING)
666 trunk = ifp->if_vlantrunk;
673 * OK, it's a trunk. Loop over and detach all vlan's on it.
674 * Check trunk pointer after each vlan_unconfig() as it will
675 * free it and set to NULL after the last vlan was detached.
677 VLAN_FOREACH_UNTIL_SAFE(ifv, ifp->if_vlantrunk,
678 ifp->if_vlantrunk == NULL)
679 vlan_unconfig_locked(ifv->ifv_ifp, 1);
681 /* Trunk should have been destroyed in vlan_unconfig(). */
682 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__));
687 * Return the trunk device for a virtual interface.
689 static struct ifnet *
690 vlan_trunkdev(struct ifnet *ifp)
694 if (ifp->if_type != IFT_L2VLAN)
707 * Return the 12-bit VLAN VID for this interface, for use by external
708 * components such as Infiniband.
710 * XXXRW: Note that the function name here is historical; it should be named
714 vlan_tag(struct ifnet *ifp, uint16_t *vidp)
718 if (ifp->if_type != IFT_L2VLAN)
721 *vidp = ifv->ifv_vid;
726 vlan_pcp(struct ifnet *ifp, uint16_t *pcpp)
730 if (ifp->if_type != IFT_L2VLAN)
733 *pcpp = ifv->ifv_pcp;
738 * Return a driver specific cookie for this interface. Synchronization
739 * with setcookie must be provided by the driver.
742 vlan_cookie(struct ifnet *ifp)
746 if (ifp->if_type != IFT_L2VLAN)
749 return (ifv->ifv_cookie);
753 * Store a cookie in our softc that drivers can use to store driver
754 * private per-instance data in.
757 vlan_setcookie(struct ifnet *ifp, void *cookie)
761 if (ifp->if_type != IFT_L2VLAN)
764 ifv->ifv_cookie = cookie;
769 * Return the vlan device present at the specific VID.
771 static struct ifnet *
772 vlan_devat(struct ifnet *ifp, uint16_t vid)
774 struct ifvlantrunk *trunk;
778 trunk = ifp->if_vlantrunk;
784 ifv = vlan_gethash(trunk, vid);
792 * Recalculate the cached VLAN tag exposed via the MIB.
795 vlan_tag_recalculate(struct ifvlan *ifv)
798 ifv->ifv_tag = EVL_MAKETAG(ifv->ifv_vid, ifv->ifv_pcp, 0);
802 * VLAN support can be loaded as a module. The only place in the
803 * system that's intimately aware of this is ether_input. We hook
804 * into this code through vlan_input_p which is defined there and
805 * set here. No one else in the system should be aware of this so
806 * we use an explicit reference here.
808 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *);
810 /* For if_link_state_change() eyes only... */
811 extern void (*vlan_link_state_p)(struct ifnet *);
814 vlan_modevent(module_t mod, int type, void *data)
819 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
820 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
821 if (ifdetach_tag == NULL)
823 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event,
824 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
825 if (iflladdr_tag == NULL)
828 vlan_input_p = vlan_input;
829 vlan_link_state_p = vlan_link_state;
830 vlan_trunk_cap_p = vlan_trunk_capabilities;
831 vlan_trunkdev_p = vlan_trunkdev;
832 vlan_cookie_p = vlan_cookie;
833 vlan_setcookie_p = vlan_setcookie;
834 vlan_tag_p = vlan_tag;
835 vlan_pcp_p = vlan_pcp;
836 vlan_devat_p = vlan_devat;
838 vlan_cloner = if_clone_advanced(vlanname, 0, vlan_clone_match,
839 vlan_clone_create, vlan_clone_destroy);
842 printf("vlan: initialized, using "
846 "hash tables with chaining"
853 if_clone_detach(vlan_cloner);
855 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag);
856 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag);
858 vlan_link_state_p = NULL;
859 vlan_trunk_cap_p = NULL;
860 vlan_trunkdev_p = NULL;
862 vlan_cookie_p = NULL;
863 vlan_setcookie_p = NULL;
865 VLAN_LOCKING_DESTROY();
867 printf("vlan: unloaded\n");
875 static moduledata_t vlan_mod = {
881 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
882 MODULE_VERSION(if_vlan, 3);
886 vnet_vlan_init(const void *unused __unused)
889 vlan_cloner = if_clone_advanced(vlanname, 0, vlan_clone_match,
890 vlan_clone_create, vlan_clone_destroy);
891 V_vlan_cloner = vlan_cloner;
893 VNET_SYSINIT(vnet_vlan_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
894 vnet_vlan_init, NULL);
897 vnet_vlan_uninit(const void *unused __unused)
900 if_clone_detach(V_vlan_cloner);
902 VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST,
903 vnet_vlan_uninit, NULL);
907 * Check for <etherif>.<vlan> style interface names.
909 static struct ifnet *
910 vlan_clone_match_ethervid(const char *name, int *vidp)
912 char ifname[IFNAMSIZ];
917 strlcpy(ifname, name, IFNAMSIZ);
918 if ((cp = strchr(ifname, '.')) == NULL)
921 if ((ifp = ifunit_ref(ifname)) == NULL)
929 for(; *cp >= '0' && *cp <= '9'; cp++)
930 vid = (vid * 10) + (*cp - '0');
942 vlan_clone_match(struct if_clone *ifc, const char *name)
946 if (vlan_clone_match_ethervid(name, NULL) != NULL)
949 if (strncmp(vlanname, name, strlen(vlanname)) != 0)
951 for (cp = name + 4; *cp != '\0'; cp++) {
952 if (*cp < '0' || *cp > '9')
960 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
971 struct sockaddr_dl *sdl;
973 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
976 * There are 3 (ugh) ways to specify the cloned device:
977 * o pass a parameter block with the clone request.
978 * o specify parameters in the text of the clone device name
979 * o specify no parameters and get an unattached device that
980 * must be configured separately.
981 * The first technique is preferred; the latter two are
982 * supported for backwards compatibility.
984 * XXXRW: Note historic use of the word "tag" here. New ioctls may be
988 error = copyin(params, &vlr, sizeof(vlr));
991 p = ifunit_ref(vlr.vlr_parent);
994 error = ifc_name2unit(name, &unit);
1000 wildcard = (unit < 0);
1001 } else if ((p = vlan_clone_match_ethervid(name, &vid)) != NULL) {
1006 error = ifc_name2unit(name, &unit);
1010 wildcard = (unit < 0);
1013 error = ifc_alloc_unit(ifc, &unit);
1020 /* In the wildcard case, we need to update the name. */
1022 for (dp = name; *dp != '\0'; dp++);
1023 if (snprintf(dp, len - (dp-name), "%d", unit) >
1024 len - (dp-name) - 1) {
1025 panic("%s: interface name too long", __func__);
1029 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO);
1030 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER);
1032 ifc_free_unit(ifc, unit);
1038 CK_SLIST_INIT(&ifv->vlan_mc_listhead);
1039 ifp->if_softc = ifv;
1041 * Set the name manually rather than using if_initname because
1042 * we don't conform to the default naming convention for interfaces.
1044 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1045 ifp->if_dname = vlanname;
1046 ifp->if_dunit = unit;
1048 ifp->if_init = vlan_init;
1049 ifp->if_transmit = vlan_transmit;
1050 ifp->if_qflush = vlan_qflush;
1051 ifp->if_ioctl = vlan_ioctl;
1053 ifp->if_snd_tag_alloc = vlan_snd_tag_alloc;
1055 ifp->if_flags = VLAN_IFFLAGS;
1056 ether_ifattach(ifp, eaddr);
1057 /* Now undo some of the damage... */
1058 ifp->if_baudrate = 0;
1059 ifp->if_type = IFT_L2VLAN;
1060 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN;
1062 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1063 sdl->sdl_type = IFT_L2VLAN;
1066 error = vlan_config(ifv, p, vid);
1070 * Since we've partially failed, we need to back
1071 * out all the way, otherwise userland could get
1072 * confused. Thus, we destroy the interface.
1074 ether_ifdetach(ifp);
1077 ifc_free_unit(ifc, unit);
1088 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
1090 struct ifvlan *ifv = ifp->if_softc;
1091 int unit = ifp->if_dunit;
1093 ether_ifdetach(ifp); /* first, remove it from system-wide lists */
1094 vlan_unconfig(ifp); /* now it can be unconfigured and freed */
1096 * We should have the only reference to the ifv now, so we can now
1097 * drain any remaining lladdr task before freeing the ifnet and the
1100 taskqueue_drain(taskqueue_thread, &ifv->lladdr_task);
1104 ifc_free_unit(ifc, unit);
1110 * The ifp->if_init entry point for vlan(4) is a no-op.
1113 vlan_init(void *foo __unused)
1118 * The if_transmit method for vlan(4) interface.
1121 vlan_transmit(struct ifnet *ifp, struct mbuf *m)
1125 int error, len, mcast;
1128 ifv = ifp->if_softc;
1129 if (TRUNK(ifv) == NULL) {
1130 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1136 len = m->m_pkthdr.len;
1137 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0;
1142 * Do not run parent's if_transmit() if the parent is not up,
1143 * or parent's driver will cause a system crash.
1145 if (!UP_AND_RUNNING(p)) {
1146 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1152 if (!ether_8021q_frame(&m, ifp, p, ifv->ifv_vid, ifv->ifv_pcp)) {
1153 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1159 * Send it, precisely as ether_output() would have.
1161 error = (p->if_transmit)(p, m);
1163 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
1164 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
1165 if_inc_counter(ifp, IFCOUNTER_OMCASTS, mcast);
1167 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1173 * The ifp->if_qflush entry point for vlan(4) is a no-op.
1176 vlan_qflush(struct ifnet *ifp __unused)
1181 vlan_input(struct ifnet *ifp, struct mbuf *m)
1183 struct ifvlantrunk *trunk;
1189 trunk = ifp->if_vlantrunk;
1190 if (trunk == NULL) {
1196 if (m->m_flags & M_VLANTAG) {
1198 * Packet is tagged, but m contains a normal
1199 * Ethernet frame; the tag is stored out-of-band.
1201 tag = m->m_pkthdr.ether_vtag;
1202 m->m_flags &= ~M_VLANTAG;
1204 struct ether_vlan_header *evl;
1207 * Packet is tagged in-band as specified by 802.1q.
1209 switch (ifp->if_type) {
1211 if (m->m_len < sizeof(*evl) &&
1212 (m = m_pullup(m, sizeof(*evl))) == NULL) {
1213 if_printf(ifp, "cannot pullup VLAN header\n");
1217 evl = mtod(m, struct ether_vlan_header *);
1218 tag = ntohs(evl->evl_tag);
1221 * Remove the 802.1q header by copying the Ethernet
1222 * addresses over it and adjusting the beginning of
1223 * the data in the mbuf. The encapsulated Ethernet
1224 * type field is already in place.
1226 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
1227 ETHER_HDR_LEN - ETHER_TYPE_LEN);
1228 m_adj(m, ETHER_VLAN_ENCAP_LEN);
1233 panic("%s: %s has unsupported if_type %u",
1234 __func__, ifp->if_xname, ifp->if_type);
1236 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
1243 vid = EVL_VLANOFTAG(tag);
1245 ifv = vlan_gethash(trunk, vid);
1246 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) {
1248 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
1253 if (vlan_mtag_pcp) {
1255 * While uncommon, it is possible that we will find a 802.1q
1256 * packet encapsulated inside another packet that also had an
1257 * 802.1q header. For example, ethernet tunneled over IPSEC
1258 * arriving over ethernet. In that case, we replace the
1259 * existing 802.1q PCP m_tag value.
1261 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
1263 mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_IN,
1264 sizeof(uint8_t), M_NOWAIT);
1266 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1271 m_tag_prepend(m, mtag);
1273 *(uint8_t *)(mtag + 1) = EVL_PRIOFTAG(tag);
1276 m->m_pkthdr.rcvif = ifv->ifv_ifp;
1277 if_inc_counter(ifv->ifv_ifp, IFCOUNTER_IPACKETS, 1);
1280 /* Pass it back through the parent's input routine. */
1281 (*ifv->ifv_ifp->if_input)(ifv->ifv_ifp, m);
1285 vlan_lladdr_fn(void *arg, int pending __unused)
1290 ifv = (struct ifvlan *)arg;
1293 CURVNET_SET(ifp->if_vnet);
1295 /* The ifv_ifp already has the lladdr copied in. */
1296 if_setlladdr(ifp, IF_LLADDR(ifp), ifp->if_addrlen);
1302 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t vid)
1304 struct ifvlantrunk *trunk;
1309 * We can handle non-ethernet hardware types as long as
1310 * they handle the tagging and headers themselves.
1312 if (p->if_type != IFT_ETHER &&
1313 (p->if_capenable & IFCAP_VLAN_HWTAGGING) == 0)
1314 return (EPROTONOSUPPORT);
1315 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS)
1316 return (EPROTONOSUPPORT);
1318 * Don't let the caller set up a VLAN VID with
1319 * anything except VLID bits.
1320 * VID numbers 0x0 and 0xFFF are reserved.
1322 if (vid == 0 || vid == 0xFFF || (vid & ~EVL_VLID_MASK))
1328 if (p->if_vlantrunk == NULL) {
1329 trunk = malloc(sizeof(struct ifvlantrunk),
1330 M_VLAN, M_WAITOK | M_ZERO);
1331 vlan_inithash(trunk);
1332 TRUNK_LOCK_INIT(trunk);
1334 p->if_vlantrunk = trunk;
1336 if_ref(trunk->parent);
1337 TRUNK_WUNLOCK(trunk);
1339 trunk = p->if_vlantrunk;
1342 ifv->ifv_vid = vid; /* must set this before vlan_inshash() */
1343 ifv->ifv_pcp = 0; /* Default: best effort delivery. */
1344 vlan_tag_recalculate(ifv);
1345 error = vlan_inshash(trunk, ifv);
1348 ifv->ifv_proto = ETHERTYPE_VLAN;
1349 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN;
1350 ifv->ifv_mintu = ETHERMIN;
1351 ifv->ifv_pflags = 0;
1352 ifv->ifv_capenable = -1;
1355 * If the parent supports the VLAN_MTU capability,
1356 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames,
1359 if (p->if_capenable & IFCAP_VLAN_MTU) {
1361 * No need to fudge the MTU since the parent can
1362 * handle extended frames.
1364 ifv->ifv_mtufudge = 0;
1367 * Fudge the MTU by the encapsulation size. This
1368 * makes us incompatible with strictly compliant
1369 * 802.1Q implementations, but allows us to use
1370 * the feature with other NetBSD implementations,
1371 * which might still be useful.
1373 ifv->ifv_mtufudge = ifv->ifv_encaplen;
1376 ifv->ifv_trunk = trunk;
1379 * Initialize fields from our parent. This duplicates some
1380 * work with ether_ifattach() but allows for non-ethernet
1381 * interfaces to also work.
1383 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge;
1384 ifp->if_baudrate = p->if_baudrate;
1385 ifp->if_output = p->if_output;
1386 ifp->if_input = p->if_input;
1387 ifp->if_resolvemulti = p->if_resolvemulti;
1388 ifp->if_addrlen = p->if_addrlen;
1389 ifp->if_broadcastaddr = p->if_broadcastaddr;
1390 ifp->if_pcp = ifv->ifv_pcp;
1393 * Copy only a selected subset of flags from the parent.
1394 * Other flags are none of our business.
1396 #define VLAN_COPY_FLAGS (IFF_SIMPLEX)
1397 ifp->if_flags &= ~VLAN_COPY_FLAGS;
1398 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS;
1399 #undef VLAN_COPY_FLAGS
1401 ifp->if_link_state = p->if_link_state;
1403 TRUNK_RLOCK(TRUNK(ifv));
1404 vlan_capabilities(ifv);
1405 TRUNK_RUNLOCK(TRUNK(ifv));
1408 * Set up our interface address to reflect the underlying
1409 * physical interface's.
1411 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen);
1412 ((struct sockaddr_dl *)ifp->if_addr->ifa_addr)->sdl_alen =
1415 TASK_INIT(&ifv->lladdr_task, 0, vlan_lladdr_fn, ifv);
1417 /* We are ready for operation now. */
1418 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1420 /* Update flags on the parent, if necessary. */
1421 vlan_setflags(ifp, 1);
1424 * Configure multicast addresses that may already be
1425 * joined on the vlan device.
1427 (void)vlan_setmulti(ifp);
1431 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_vid);
1438 vlan_unconfig(struct ifnet *ifp)
1442 vlan_unconfig_locked(ifp, 0);
1447 vlan_unconfig_locked(struct ifnet *ifp, int departing)
1449 struct ifvlantrunk *trunk;
1450 struct vlan_mc_entry *mc;
1452 struct ifnet *parent;
1455 VLAN_XLOCK_ASSERT();
1457 ifv = ifp->if_softc;
1458 trunk = ifv->ifv_trunk;
1461 if (trunk != NULL) {
1462 parent = trunk->parent;
1465 * Since the interface is being unconfigured, we need to
1466 * empty the list of multicast groups that we may have joined
1467 * while we were alive from the parent's list.
1469 while ((mc = CK_SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) {
1471 * If the parent interface is being detached,
1472 * all its multicast addresses have already
1473 * been removed. Warn about errors if
1474 * if_delmulti() does fail, but don't abort as
1475 * all callers expect vlan destruction to
1479 error = if_delmulti(parent,
1480 (struct sockaddr *)&mc->mc_addr);
1483 "Failed to delete multicast address from parent: %d\n",
1486 CK_SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries);
1487 epoch_call(net_epoch_preempt, &mc->mc_epoch_ctx, vlan_mc_free);
1490 vlan_setflags(ifp, 0); /* clear special flags on parent */
1492 vlan_remhash(trunk, ifv);
1493 ifv->ifv_trunk = NULL;
1496 * Check if we were the last.
1498 if (trunk->refcnt == 0) {
1499 parent->if_vlantrunk = NULL;
1501 trunk_destroy(trunk);
1505 /* Disconnect from parent. */
1506 if (ifv->ifv_pflags)
1507 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__);
1508 ifp->if_mtu = ETHERMTU;
1509 ifp->if_link_state = LINK_STATE_UNKNOWN;
1510 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1513 * Only dispatch an event if vlan was
1514 * attached, otherwise there is nothing
1515 * to cleanup anyway.
1518 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_vid);
1521 /* Handle a reference counted flag that should be set on the parent as well */
1523 vlan_setflag(struct ifnet *ifp, int flag, int status,
1524 int (*func)(struct ifnet *, int))
1529 VLAN_SXLOCK_ASSERT();
1531 ifv = ifp->if_softc;
1532 status = status ? (ifp->if_flags & flag) : 0;
1533 /* Now "status" contains the flag value or 0 */
1536 * See if recorded parent's status is different from what
1537 * we want it to be. If it is, flip it. We record parent's
1538 * status in ifv_pflags so that we won't clear parent's flag
1539 * we haven't set. In fact, we don't clear or set parent's
1540 * flags directly, but get or release references to them.
1541 * That's why we can be sure that recorded flags still are
1542 * in accord with actual parent's flags.
1544 if (status != (ifv->ifv_pflags & flag)) {
1545 error = (*func)(PARENT(ifv), status);
1548 ifv->ifv_pflags &= ~flag;
1549 ifv->ifv_pflags |= status;
1555 * Handle IFF_* flags that require certain changes on the parent:
1556 * if "status" is true, update parent's flags respective to our if_flags;
1557 * if "status" is false, forcedly clear the flags set on parent.
1560 vlan_setflags(struct ifnet *ifp, int status)
1564 for (i = 0; vlan_pflags[i].flag; i++) {
1565 error = vlan_setflag(ifp, vlan_pflags[i].flag,
1566 status, vlan_pflags[i].func);
1573 /* Inform all vlans that their parent has changed link state */
1575 vlan_link_state(struct ifnet *ifp)
1577 struct ifvlantrunk *trunk;
1580 /* Called from a taskqueue_swi task, so we cannot sleep. */
1582 trunk = ifp->if_vlantrunk;
1583 if (trunk == NULL) {
1589 VLAN_FOREACH(ifv, trunk) {
1590 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate;
1591 if_link_state_change(ifv->ifv_ifp,
1592 trunk->parent->if_link_state);
1594 TRUNK_WUNLOCK(trunk);
1599 vlan_capabilities(struct ifvlan *ifv)
1603 struct ifnet_hw_tsomax hw_tsomax;
1604 int cap = 0, ena = 0, mena;
1607 VLAN_SXLOCK_ASSERT();
1608 TRUNK_RLOCK_ASSERT(TRUNK(ifv));
1612 /* Mask parent interface enabled capabilities disabled by user. */
1613 mena = p->if_capenable & ifv->ifv_capenable;
1616 * If the parent interface can do checksum offloading
1617 * on VLANs, then propagate its hardware-assisted
1618 * checksumming flags. Also assert that checksum
1619 * offloading requires hardware VLAN tagging.
1621 if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
1622 cap |= p->if_capabilities & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6);
1623 if (p->if_capenable & IFCAP_VLAN_HWCSUM &&
1624 p->if_capenable & IFCAP_VLAN_HWTAGGING) {
1625 ena |= mena & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6);
1626 if (ena & IFCAP_TXCSUM)
1627 hwa |= p->if_hwassist & (CSUM_IP | CSUM_TCP |
1628 CSUM_UDP | CSUM_SCTP);
1629 if (ena & IFCAP_TXCSUM_IPV6)
1630 hwa |= p->if_hwassist & (CSUM_TCP_IPV6 |
1631 CSUM_UDP_IPV6 | CSUM_SCTP_IPV6);
1635 * If the parent interface can do TSO on VLANs then
1636 * propagate the hardware-assisted flag. TSO on VLANs
1637 * does not necessarily require hardware VLAN tagging.
1639 memset(&hw_tsomax, 0, sizeof(hw_tsomax));
1640 if_hw_tsomax_common(p, &hw_tsomax);
1641 if_hw_tsomax_update(ifp, &hw_tsomax);
1642 if (p->if_capabilities & IFCAP_VLAN_HWTSO)
1643 cap |= p->if_capabilities & IFCAP_TSO;
1644 if (p->if_capenable & IFCAP_VLAN_HWTSO) {
1645 ena |= mena & IFCAP_TSO;
1646 if (ena & IFCAP_TSO)
1647 hwa |= p->if_hwassist & CSUM_TSO;
1651 * If the parent interface can do LRO and checksum offloading on
1652 * VLANs, then guess it may do LRO on VLANs. False positive here
1653 * cost nothing, while false negative may lead to some confusions.
1655 if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
1656 cap |= p->if_capabilities & IFCAP_LRO;
1657 if (p->if_capenable & IFCAP_VLAN_HWCSUM)
1658 ena |= p->if_capenable & IFCAP_LRO;
1661 * If the parent interface can offload TCP connections over VLANs then
1662 * propagate its TOE capability to the VLAN interface.
1664 * All TOE drivers in the tree today can deal with VLANs. If this
1665 * changes then IFCAP_VLAN_TOE should be promoted to a full capability
1668 #define IFCAP_VLAN_TOE IFCAP_TOE
1669 if (p->if_capabilities & IFCAP_VLAN_TOE)
1670 cap |= p->if_capabilities & IFCAP_TOE;
1671 if (p->if_capenable & IFCAP_VLAN_TOE) {
1672 TOEDEV(ifp) = TOEDEV(p);
1673 ena |= mena & IFCAP_TOE;
1677 * If the parent interface supports dynamic link state, so does the
1680 cap |= (p->if_capabilities & IFCAP_LINKSTATE);
1681 ena |= (mena & IFCAP_LINKSTATE);
1685 * If the parent interface supports ratelimiting, so does the
1688 cap |= (p->if_capabilities & IFCAP_TXRTLMT);
1689 ena |= (mena & IFCAP_TXRTLMT);
1692 ifp->if_capabilities = cap;
1693 ifp->if_capenable = ena;
1694 ifp->if_hwassist = hwa;
1698 vlan_trunk_capabilities(struct ifnet *ifp)
1700 struct ifvlantrunk *trunk;
1704 trunk = ifp->if_vlantrunk;
1705 if (trunk == NULL) {
1710 VLAN_FOREACH(ifv, trunk) {
1711 vlan_capabilities(ifv);
1713 TRUNK_RUNLOCK(trunk);
1718 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1724 struct ifvlantrunk *trunk;
1728 ifr = (struct ifreq *)data;
1729 ifa = (struct ifaddr *) data;
1730 ifv = ifp->if_softc;
1734 ifp->if_flags |= IFF_UP;
1736 if (ifa->ifa_addr->sa_family == AF_INET)
1737 arp_ifinit(ifp, ifa);
1741 bcopy(IF_LLADDR(ifp), &ifr->ifr_addr.sa_data[0],
1746 if (TRUNK(ifv) != NULL) {
1749 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data);
1751 /* Limit the result to the parent's current config. */
1753 struct ifmediareq *ifmr;
1755 ifmr = (struct ifmediareq *)data;
1756 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) {
1757 ifmr->ifm_count = 1;
1758 error = copyout(&ifmr->ifm_current,
1775 * Set the interface MTU.
1779 if (trunk != NULL) {
1782 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) ||
1784 (ifv->ifv_mintu - ifv->ifv_mtufudge))
1787 ifp->if_mtu = ifr->ifr_mtu;
1788 TRUNK_WUNLOCK(trunk);
1797 * XXXRW/XXXBZ: The goal in these checks is to allow a VLAN
1798 * interface to be delegated to a jail without allowing the
1799 * jail to change what underlying interface/VID it is
1800 * associated with. We are not entirely convinced that this
1801 * is the right way to accomplish that policy goal.
1803 if (ifp->if_vnet != ifp->if_home_vnet) {
1808 error = copyin(ifr_data_get_ptr(ifr), &vlr, sizeof(vlr));
1811 if (vlr.vlr_parent[0] == '\0') {
1815 p = ifunit_ref(vlr.vlr_parent);
1820 error = vlan_config(ifv, p, vlr.vlr_tag);
1826 if (ifp->if_vnet != ifp->if_home_vnet) {
1831 bzero(&vlr, sizeof(vlr));
1833 if (TRUNK(ifv) != NULL) {
1834 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname,
1835 sizeof(vlr.vlr_parent));
1836 vlr.vlr_tag = ifv->ifv_vid;
1839 error = copyout(&vlr, ifr_data_get_ptr(ifr), sizeof(vlr));
1844 * We should propagate selected flags to the parent,
1845 * e.g., promiscuous mode.
1848 if (TRUNK(ifv) != NULL)
1849 error = vlan_setflags(ifp, 1);
1856 * If we don't have a parent, just remember the membership for
1859 * XXX We need the rmlock here to avoid sleeping while
1860 * holding in6_multi_mtx.
1865 error = vlan_setmulti(ifp);
1871 if (ifp->if_vnet != ifp->if_home_vnet) {
1876 ifr->ifr_vlan_pcp = ifv->ifv_pcp;
1881 if (ifp->if_vnet != ifp->if_home_vnet) {
1886 error = priv_check(curthread, PRIV_NET_SETVLANPCP);
1889 if (ifr->ifr_vlan_pcp > 7) {
1893 ifv->ifv_pcp = ifr->ifr_vlan_pcp;
1894 ifp->if_pcp = ifv->ifv_pcp;
1895 vlan_tag_recalculate(ifv);
1896 /* broadcast event about PCP change */
1897 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_PCP);
1902 ifv->ifv_capenable = ifr->ifr_reqcap;
1904 if (trunk != NULL) {
1906 vlan_capabilities(ifv);
1907 TRUNK_RUNLOCK(trunk);
1922 vlan_snd_tag_alloc(struct ifnet *ifp,
1923 union if_snd_tag_alloc_params *params,
1924 struct m_snd_tag **ppmt)
1927 /* get trunk device */
1928 ifp = vlan_trunkdev(ifp);
1929 if (ifp == NULL || (ifp->if_capenable & IFCAP_TXRTLMT) == 0)
1930 return (EOPNOTSUPP);
1931 /* forward allocation request */
1932 return (ifp->if_snd_tag_alloc(ifp, params, ppmt));