2 * Copyright 1998 Massachusetts Institute of Technology
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs.
34 * Might be extended some day to also handle IEEE 802.1p priority
35 * tagging. This is sort of sneaky in the implementation, since
36 * we need to pretend to be enough of an Ethernet implementation
37 * to make arp work. The way we do this is by telling everyone
38 * that we are an Ethernet, and then catch the packets that
39 * ether_output() left on our output queue when it calls
40 * if_start(), rewrite them for use by the real outgoing interface,
41 * and ask it to send them.
46 #include <sys/param.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
50 #include <sys/module.h>
51 #include <sys/queue.h>
52 #include <sys/socket.h>
53 #include <sys/sockio.h>
54 #include <sys/sysctl.h>
55 #include <sys/systm.h>
58 #include <net/ethernet.h>
60 #include <net/if_clone.h>
61 #include <net/if_arp.h>
62 #include <net/if_dl.h>
63 #include <net/if_types.h>
64 #include <net/if_vlan_var.h>
67 #include <netinet/in.h>
68 #include <netinet/if_ether.h>
71 #define VLANNAME "vlan"
73 struct vlan_mc_entry {
74 struct ether_addr mc_addr;
75 SLIST_ENTRY(vlan_mc_entry) mc_entries;
79 struct ifnet *ifv_ifp;
80 struct ifnet *ifv_p; /* parent inteface of this vlan */
83 int ifvm_encaplen; /* encapsulation length */
84 int ifvm_mtufudge; /* MTU fudged by this much */
85 int ifvm_mintu; /* min transmission unit */
86 u_int16_t ifvm_proto; /* encapsulation ethertype */
87 u_int16_t ifvm_tag; /* tag to apply on packets leaving if */
89 SLIST_HEAD(__vlan_mchead, vlan_mc_entry) vlan_mc_listhead;
90 LIST_ENTRY(ifvlan) ifv_list;
93 #define ifv_tag ifv_mib.ifvm_tag
94 #define ifv_encaplen ifv_mib.ifvm_encaplen
95 #define ifv_mtufudge ifv_mib.ifvm_mtufudge
96 #define ifv_mintu ifv_mib.ifvm_mintu
98 #define IFVF_PROMISC 0x01 /* promiscuous mode enabled */
100 SYSCTL_DECL(_net_link);
101 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN");
102 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency");
104 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface");
105 static LIST_HEAD(, ifvlan) ifv_list;
108 * Locking: one lock is used to guard both the ifv_list and modification
109 * to vlan data structures. We are rather conservative here; probably
110 * more than necessary.
112 static struct mtx ifv_mtx;
113 #define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, VLANNAME, NULL, MTX_DEF)
114 #define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx)
115 #define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED)
116 #define VLAN_LOCK() mtx_lock(&ifv_mtx)
117 #define VLAN_UNLOCK() mtx_unlock(&ifv_mtx)
119 static void vlan_start(struct ifnet *ifp);
120 static void vlan_ifinit(void *foo);
121 static void vlan_input(struct ifnet *ifp, struct mbuf *m);
122 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr);
123 static int vlan_setmulti(struct ifnet *ifp);
124 static int vlan_unconfig(struct ifnet *ifp);
125 static int vlan_config(struct ifvlan *ifv, struct ifnet *p);
126 static void vlan_link_state(struct ifnet *ifp, int link);
127 static int vlan_set_promisc(struct ifnet *ifp);
129 static struct ifnet *vlan_clone_match_ethertag(struct if_clone *,
130 const char *, int *);
131 static int vlan_clone_match(struct if_clone *, const char *);
132 static int vlan_clone_create(struct if_clone *, char *, size_t);
133 static int vlan_clone_destroy(struct if_clone *, struct ifnet *);
135 static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL,
136 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy);
139 * Program our multicast filter. What we're actually doing is
140 * programming the multicast filter of the parent. This has the
141 * side effect of causing the parent interface to receive multicast
142 * traffic that it doesn't really want, which ends up being discarded
143 * later by the upper protocol layers. Unfortunately, there's no way
144 * to avoid this: there really is only one physical interface.
146 * XXX: There is a possible race here if more than one thread is
147 * modifying the multicast state of the vlan interface at the same time.
150 vlan_setmulti(struct ifnet *ifp)
153 struct ifmultiaddr *ifma, *rifma = NULL;
155 struct vlan_mc_entry *mc = NULL;
156 struct sockaddr_dl sdl;
159 /*VLAN_LOCK_ASSERT();*/
161 /* Find the parent. */
166 * If we don't have a parent, just remember the membership for
172 bzero((char *)&sdl, sizeof(sdl));
173 sdl.sdl_len = sizeof(sdl);
174 sdl.sdl_family = AF_LINK;
175 sdl.sdl_index = ifp_p->if_index;
176 sdl.sdl_type = IFT_ETHER;
177 sdl.sdl_alen = ETHER_ADDR_LEN;
179 /* First, remove any existing filter entries. */
180 while (SLIST_FIRST(&sc->vlan_mc_listhead) != NULL) {
181 mc = SLIST_FIRST(&sc->vlan_mc_listhead);
182 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN);
183 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl);
186 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries);
190 /* Now program new ones. */
191 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
192 if (ifma->ifma_addr->sa_family != AF_LINK)
194 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT);
197 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
198 (char *)&mc->mc_addr, ETHER_ADDR_LEN);
199 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries);
200 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
201 LLADDR(&sdl), ETHER_ADDR_LEN);
202 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma);
211 * VLAN support can be loaded as a module. The only place in the
212 * system that's intimately aware of this is ether_input. We hook
213 * into this code through vlan_input_p which is defined there and
214 * set here. Noone else in the system should be aware of this so
215 * we use an explicit reference here.
217 * NB: Noone should ever need to check if vlan_input_p is null or
218 * not. This is because interfaces have a count of the number
219 * of active vlans (if_nvlans) and this should never be bumped
220 * except by vlan_config--which is in this module so therefore
221 * the module must be loaded and vlan_input_p must be non-NULL.
223 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *);
225 /* For if_link_state_change() eyes only... */
226 extern void (*vlan_link_state_p)(struct ifnet *, int);
229 vlan_modevent(module_t mod, int type, void *data)
234 LIST_INIT(&ifv_list);
236 vlan_input_p = vlan_input;
237 vlan_link_state_p = vlan_link_state;
238 if_clone_attach(&vlan_cloner);
241 if_clone_detach(&vlan_cloner);
243 vlan_link_state_p = NULL;
244 while (!LIST_EMPTY(&ifv_list))
245 vlan_clone_destroy(&vlan_cloner,
246 LIST_FIRST(&ifv_list)->ifv_ifp);
255 static moduledata_t vlan_mod = {
261 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
262 MODULE_DEPEND(if_vlan, miibus, 1, 1, 1);
264 static struct ifnet *
265 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag)
271 /* Check for <etherif>.<vlan> style interface names. */
273 TAILQ_FOREACH(ifp, &ifnet, if_link) {
274 if (ifp->if_type != IFT_ETHER)
276 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0)
278 cp = name + strlen(ifp->if_xname);
281 for(; *cp != '\0'; cp++) {
282 if (*cp < '0' || *cp > '9')
284 t = (t * 10) + (*cp - '0');
296 vlan_clone_match(struct if_clone *ifc, const char *name)
300 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL)
303 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0)
305 for (cp = name + 4; *cp != '\0'; cp++) {
306 if (*cp < '0' || *cp > '9')
314 vlan_clone_create(struct if_clone *ifc, char *name, size_t len)
325 u_char eaddr[6] = {0,0,0,0,0,0};
327 if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) {
333 * Don't let the caller set up a VLAN tag with
334 * anything except VLID bits.
336 if (tag & ~EVL_VLID_MASK)
341 error = ifc_name2unit(name, &unit);
345 wildcard = (unit < 0);
348 error = ifc_alloc_unit(ifc, &unit);
352 /* In the wildcard case, we need to update the name. */
354 for (dp = name; *dp != '\0'; dp++);
355 if (snprintf(dp, len - (dp-name), "%d", unit) >
356 len - (dp-name) - 1) {
357 panic("%s: interface name too long", __func__);
361 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO);
362 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER);
364 ifc_free_unit(ifc, unit);
368 SLIST_INIT(&ifv->vlan_mc_listhead);
372 * Set the name manually rather than using if_initname because
373 * we don't conform to the default naming convention for interfaces.
375 strlcpy(ifp->if_xname, name, IFNAMSIZ);
376 ifp->if_dname = ifc->ifc_name;
377 ifp->if_dunit = unit;
378 /* NB: flags are not set here */
379 ifp->if_linkmib = &ifv->ifv_mib;
380 ifp->if_linkmiblen = sizeof(ifv->ifv_mib);
381 /* NB: mtu is not set here */
383 ifp->if_init = vlan_ifinit;
384 ifp->if_start = vlan_start;
385 ifp->if_ioctl = vlan_ioctl;
386 ifp->if_snd.ifq_maxlen = ifqmaxlen;
387 ether_ifattach(ifp, eaddr);
388 /* Now undo some of the damage... */
389 ifp->if_baudrate = 0;
390 ifp->if_type = IFT_L2VLAN;
391 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN;
394 LIST_INSERT_HEAD(&ifv_list, ifv, ifv_list);
399 error = vlan_config(ifv, p);
402 * Since we've partialy failed, we need to back
403 * out all the way, otherwise userland could get
404 * confused. Thus, we destroy the interface.
406 LIST_REMOVE(ifv, ifv_list);
410 if_free_type(ifp, IFT_ETHER);
416 ifp->if_flags |= IFF_RUNNING;
419 /* Update promiscuous mode, if necessary. */
420 vlan_set_promisc(ifp);
427 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
430 struct ifvlan *ifv = ifp->if_softc;
432 unit = ifp->if_dunit;
435 LIST_REMOVE(ifv, ifv_list);
444 ifc_free_unit(ifc, unit);
450 * The ifp->if_init entry point for vlan(4) is a no-op.
453 vlan_ifinit(void *foo)
459 vlan_start(struct ifnet *ifp)
463 struct ether_vlan_header *evl;
470 ifp->if_flags |= IFF_OACTIVE;
472 IF_DEQUEUE(&ifp->if_snd, m);
478 * Do not run parent's if_start() if the parent is not up,
479 * or parent's driver will cause a system crash.
481 if ((p->if_flags & (IFF_UP | IFF_RUNNING)) !=
482 (IFF_UP | IFF_RUNNING)) {
484 ifp->if_collisions++;
489 * If underlying interface can do VLAN tag insertion itself,
490 * just pass the packet along. However, we need some way to
491 * tell the interface where the packet came from so that it
492 * knows how to find the VLAN tag to use, so we attach a
493 * packet tag that holds it.
495 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) {
496 struct m_tag *mtag = m_tag_alloc(MTAG_VLAN,
505 *(u_int*)(mtag + 1) = ifv->ifv_tag;
506 m_tag_prepend(m, mtag);
508 M_PREPEND(m, ifv->ifv_encaplen, M_DONTWAIT);
511 "unable to prepend VLAN header\n");
515 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
517 if (m->m_len < sizeof(*evl)) {
518 m = m_pullup(m, sizeof(*evl));
521 "cannot pullup VLAN header\n");
528 * Transform the Ethernet header into an Ethernet header
529 * with 802.1Q encapsulation.
531 bcopy(mtod(m, char *) + ifv->ifv_encaplen,
532 mtod(m, char *), ETHER_HDR_LEN);
533 evl = mtod(m, struct ether_vlan_header *);
534 evl->evl_proto = evl->evl_encap_proto;
535 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
536 evl->evl_tag = htons(ifv->ifv_tag);
538 printf("vlan_start: %*D\n", (int)sizeof(*evl),
539 (unsigned char *)evl, ":");
544 * Send it, precisely as ether_output() would have.
545 * We are already running at splimp.
547 IFQ_HANDOFF(p, m, error);
553 ifp->if_flags &= ~IFF_OACTIVE;
557 vlan_input(struct ifnet *ifp, struct mbuf *m)
559 struct ether_vlan_header *evl;
564 mtag = m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL);
567 * Packet is tagged, m contains a normal
568 * Ethernet frame; the tag is stored out-of-band.
570 tag = EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag));
571 m_tag_delete(m, mtag);
572 m->m_flags &= ~M_VLANTAG;
574 switch (ifp->if_type) {
576 if (m->m_len < sizeof(*evl) &&
577 (m = m_pullup(m, sizeof(*evl))) == NULL) {
578 if_printf(ifp, "cannot pullup VLAN header\n");
581 evl = mtod(m, struct ether_vlan_header *);
582 KASSERT(ntohs(evl->evl_encap_proto) == ETHERTYPE_VLAN,
583 ("vlan_input: bad encapsulated protocols (%u)",
584 ntohs(evl->evl_encap_proto)));
586 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag));
589 * Restore the original ethertype. We'll remove
590 * the encapsulation after we've found the vlan
591 * interface corresponding to the tag.
593 evl->evl_encap_proto = evl->evl_proto;
598 panic("vlan_input: unsupported if type %u",
606 LIST_FOREACH(ifv, &ifv_list, ifv_list)
607 if (ifp == ifv->ifv_p && tag == ifv->ifv_tag)
610 if (ifv == NULL || (ifv->ifv_ifp->if_flags & IFF_UP) == 0) {
615 printf("vlan_input: tag %d, no interface\n", tag);
619 VLAN_UNLOCK(); /* XXX extend below? */
621 printf("vlan_input: tag %d, parent %s\n", tag, ifv->ifv_p->if_xname);
626 * Packet had an in-line encapsulation header;
627 * remove it. The original header has already
628 * been fixed up above.
630 bcopy(mtod(m, caddr_t),
631 mtod(m, caddr_t) + ETHER_VLAN_ENCAP_LEN,
633 m_adj(m, ETHER_VLAN_ENCAP_LEN);
636 m->m_pkthdr.rcvif = ifv->ifv_ifp;
637 ifv->ifv_ifp->if_ipackets++;
639 /* Pass it back through the parent's input routine. */
640 (*ifp->if_input)(ifv->ifv_ifp, m);
644 vlan_config(struct ifvlan *ifv, struct ifnet *p)
646 struct ifaddr *ifa1, *ifa2;
647 struct sockaddr_dl *sdl1, *sdl2;
651 if (p->if_data.ifi_type != IFT_ETHER)
652 return (EPROTONOSUPPORT);
656 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN;
657 ifv->ifv_mintu = ETHERMIN;
661 * The active VLAN counter on the parent is used
662 * at various places to see if there is a vlan(4)
663 * attached to this physical interface.
668 * If the parent supports the VLAN_MTU capability,
669 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames,
672 if (p->if_capenable & IFCAP_VLAN_MTU) {
674 * No need to fudge the MTU since the parent can
675 * handle extended frames.
677 ifv->ifv_mtufudge = 0;
680 * Fudge the MTU by the encapsulation size. This
681 * makes us incompatible with strictly compliant
682 * 802.1Q implementations, but allows us to use
683 * the feature with other NetBSD implementations,
684 * which might still be useful.
686 ifv->ifv_mtufudge = ifv->ifv_encaplen;
690 ifv->ifv_ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge;
692 * Copy only a selected subset of flags from the parent.
693 * Other flags are none of our business.
695 ifv->ifv_ifp->if_flags = (p->if_flags &
696 (IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX | IFF_POINTOPOINT));
697 ifv->ifv_ifp->if_link_state = p->if_link_state;
701 * Not ready yet. We need notification from the parent
702 * when hw checksumming flags in its if_capenable change.
703 * Flags set in if_capabilities only are useless.
706 * If the parent interface can do hardware-assisted
707 * VLAN encapsulation, then propagate its hardware-
708 * assisted checksumming flags.
710 if (p->if_capabilities & IFCAP_VLAN_HWTAGGING)
711 ifv->ifv_ifpif_capabilities |= p->if_capabilities & IFCAP_HWCSUM;
715 * Set up our ``Ethernet address'' to reflect the underlying
716 * physical interface's.
718 ifa1 = ifaddr_byindex(ifv->ifv_ifp->if_index);
719 ifa2 = ifaddr_byindex(p->if_index);
720 sdl1 = (struct sockaddr_dl *)ifa1->ifa_addr;
721 sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr;
722 sdl1->sdl_type = IFT_ETHER;
723 sdl1->sdl_alen = ETHER_ADDR_LEN;
724 bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN);
725 bcopy(LLADDR(sdl2), IFP2ENADDR(ifv->ifv_ifp), ETHER_ADDR_LEN);
728 * Configure multicast addresses that may already be
729 * joined on the vlan device.
731 (void)vlan_setmulti(ifv->ifv_ifp); /* XXX: VLAN lock held */
737 vlan_unconfig(struct ifnet *ifp)
740 struct sockaddr_dl *sdl;
741 struct vlan_mc_entry *mc;
752 struct sockaddr_dl sdl;
755 * Since the interface is being unconfigured, we need to
756 * empty the list of multicast groups that we may have joined
757 * while we were alive from the parent's list.
759 bzero((char *)&sdl, sizeof(sdl));
760 sdl.sdl_len = sizeof(sdl);
761 sdl.sdl_family = AF_LINK;
762 sdl.sdl_index = p->if_index;
763 sdl.sdl_type = IFT_ETHER;
764 sdl.sdl_alen = ETHER_ADDR_LEN;
766 while(SLIST_FIRST(&ifv->vlan_mc_listhead) != NULL) {
767 mc = SLIST_FIRST(&ifv->vlan_mc_listhead);
768 bcopy((char *)&mc->mc_addr, LLADDR(&sdl),
770 error = if_delmulti(p, (struct sockaddr *)&sdl);
773 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries);
780 /* Disconnect from parent. */
782 ifv->ifv_ifp->if_mtu = ETHERMTU; /* XXX why not 0? */
784 ifv->ifv_ifp->if_link_state = LINK_STATE_UNKNOWN;
786 /* Clear our MAC address. */
787 ifa = ifaddr_byindex(ifv->ifv_ifp->if_index);
788 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
789 sdl->sdl_type = IFT_ETHER;
790 sdl->sdl_alen = ETHER_ADDR_LEN;
791 bzero(LLADDR(sdl), ETHER_ADDR_LEN);
792 bzero(IFP2ENADDR(ifv->ifv_ifp), ETHER_ADDR_LEN);
798 vlan_set_promisc(struct ifnet *ifp)
800 struct ifvlan *ifv = ifp->if_softc;
803 if ((ifp->if_flags & IFF_PROMISC) != 0) {
804 if ((ifv->ifv_flags & IFVF_PROMISC) == 0) {
805 error = ifpromisc(ifv->ifv_p, 1);
807 ifv->ifv_flags |= IFVF_PROMISC;
810 if ((ifv->ifv_flags & IFVF_PROMISC) != 0) {
811 error = ifpromisc(ifv->ifv_p, 0);
813 ifv->ifv_flags &= ~IFVF_PROMISC;
820 /* Inform all vlans that their parent has changed link state */
822 vlan_link_state(struct ifnet *ifp, int link)
827 LIST_FOREACH(ifv, &ifv_list, ifv_list) {
828 if (ifv->ifv_p == ifp)
829 if_link_state_change(ifv->ifv_ifp,
830 ifv->ifv_p->if_link_state);
836 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
845 ifr = (struct ifreq *)data;
846 ifa = (struct ifaddr *)data;
851 ifp->if_flags |= IFF_UP;
853 switch (ifa->ifa_addr->sa_family) {
856 arp_ifinit(ifv->ifv_ifp, ifa);
868 sa = (struct sockaddr *) &ifr->ifr_data;
869 bcopy(IFP2ENADDR(ifp), (caddr_t)sa->sa_data,
876 if (ifv->ifv_p != NULL) {
877 error = (*ifv->ifv_p->if_ioctl)(ifv->ifv_p,
880 /* Limit the result to the parent's current config. */
882 struct ifmediareq *ifmr;
884 ifmr = (struct ifmediareq *)data;
885 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) {
887 error = copyout(&ifmr->ifm_current,
904 * Set the interface MTU.
907 if (ifv->ifv_p != NULL) {
909 (ifv->ifv_p->if_mtu - ifv->ifv_mtufudge) ||
911 (ifv->ifv_mintu - ifv->ifv_mtufudge))
914 ifp->if_mtu = ifr->ifr_mtu;
921 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr));
924 if (vlr.vlr_parent[0] == '\0') {
927 if (ifp->if_flags & IFF_UP)
929 ifp->if_flags &= ~IFF_RUNNING;
933 p = ifunit(vlr.vlr_parent);
939 * Don't let the caller set up a VLAN tag with
940 * anything except VLID bits.
942 if (vlr.vlr_tag & ~EVL_VLID_MASK) {
947 error = vlan_config(ifv, p);
952 ifv->ifv_tag = vlr.vlr_tag;
953 ifp->if_flags |= IFF_RUNNING;
956 /* Update promiscuous mode, if necessary. */
957 vlan_set_promisc(ifp);
961 bzero(&vlr, sizeof(vlr));
964 strlcpy(vlr.vlr_parent, ifv->ifv_p->if_xname,
965 sizeof(vlr.vlr_parent));
966 vlr.vlr_tag = ifv->ifv_tag;
969 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr));
974 * For promiscuous mode, we enable promiscuous mode on
975 * the parent if we need promiscuous on the VLAN interface.
977 if (ifv->ifv_p != NULL)
978 error = vlan_set_promisc(ifp);
984 error = vlan_setmulti(ifp);