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freebsd/sys/net/if_vlan.c
Marko Zec ccf7ba972c Allow for vlan(4) ifnets to have overlapping unit numbers if they are
created in separated vnets.  As a side-effect of having a separated
if_cloner instance for each vnet, all vlan ifnets created in a vnet
will be automatically destroyed when vnet teardown is initiated.

Disallow SIOCSETVLAN and SIOCGETVLAN ioctls on vlan ifnets which are
associated with physical ifnets residing in parent vnets.

This is an interim vlan-specific solution which will be superseded by a
more generic if_cloner V_irtualization change from p4.  For nooptions
VIMAGE builds, this should be a no-op change.

Discussed with:	bz
MFC after:	3 days
2010-11-22 23:35:29 +00:00

1542 lines
39 KiB
C

/*-
* Copyright 1998 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs.
* Might be extended some day to also handle IEEE 802.1p priority
* tagging. This is sort of sneaky in the implementation, since
* we need to pretend to be enough of an Ethernet implementation
* to make arp work. The way we do this is by telling everyone
* that we are an Ethernet, and then catch the packets that
* ether_output() left on our output queue when it calls
* if_start(), rewrite them for use by the real outgoing interface,
* and ask it to send them.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_vlan.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_clone.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_vlan_var.h>
#include <net/vnet.h>
#define VLANNAME "vlan"
#define VLAN_DEF_HWIDTH 4
#define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST)
#define UP_AND_RUNNING(ifp) \
((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING)
LIST_HEAD(ifvlanhead, ifvlan);
struct ifvlantrunk {
struct ifnet *parent; /* parent interface of this trunk */
struct rwlock rw;
#ifdef VLAN_ARRAY
#define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1)
struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */
#else
struct ifvlanhead *hash; /* dynamic hash-list table */
uint16_t hmask;
uint16_t hwidth;
#endif
int refcnt;
};
struct vlan_mc_entry {
struct ether_addr mc_addr;
SLIST_ENTRY(vlan_mc_entry) mc_entries;
};
struct ifvlan {
struct ifvlantrunk *ifv_trunk;
struct ifnet *ifv_ifp;
#define TRUNK(ifv) ((ifv)->ifv_trunk)
#define PARENT(ifv) ((ifv)->ifv_trunk->parent)
int ifv_pflags; /* special flags we have set on parent */
struct ifv_linkmib {
int ifvm_encaplen; /* encapsulation length */
int ifvm_mtufudge; /* MTU fudged by this much */
int ifvm_mintu; /* min transmission unit */
uint16_t ifvm_proto; /* encapsulation ethertype */
uint16_t ifvm_tag; /* tag to apply on packets leaving if */
} ifv_mib;
SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead;
#ifndef VLAN_ARRAY
LIST_ENTRY(ifvlan) ifv_list;
#endif
};
#define ifv_proto ifv_mib.ifvm_proto
#define ifv_tag ifv_mib.ifvm_tag
#define ifv_encaplen ifv_mib.ifvm_encaplen
#define ifv_mtufudge ifv_mib.ifvm_mtufudge
#define ifv_mintu ifv_mib.ifvm_mintu
/* Special flags we should propagate to parent. */
static struct {
int flag;
int (*func)(struct ifnet *, int);
} vlan_pflags[] = {
{IFF_PROMISC, ifpromisc},
{IFF_ALLMULTI, if_allmulti},
{0, NULL}
};
SYSCTL_DECL(_net_link);
SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN");
SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency");
static int soft_pad = 0;
SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0,
"pad short frames before tagging");
static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface");
static eventhandler_tag ifdetach_tag;
static eventhandler_tag iflladdr_tag;
/*
* We have a global mutex, that is used to serialize configuration
* changes and isn't used in normal packet delivery.
*
* We also have a per-trunk rwlock, that is locked shared on packet
* processing and exclusive when configuration is changed.
*
* The VLAN_ARRAY substitutes the dynamic hash with a static array
* with 4096 entries. In theory this can give a boost in processing,
* however on practice it does not. Probably this is because array
* is too big to fit into CPU cache.
*/
static struct mtx ifv_mtx;
#define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF)
#define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx)
#define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED)
#define VLAN_LOCK() mtx_lock(&ifv_mtx)
#define VLAN_UNLOCK() mtx_unlock(&ifv_mtx)
#define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME)
#define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw)
#define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw)
#define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw)
#define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED)
#define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw)
#define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw)
#define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED)
#ifndef VLAN_ARRAY
static void vlan_inithash(struct ifvlantrunk *trunk);
static void vlan_freehash(struct ifvlantrunk *trunk);
static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch);
static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk,
uint16_t tag);
#endif
static void trunk_destroy(struct ifvlantrunk *trunk);
static void vlan_start(struct ifnet *ifp);
static void vlan_init(void *foo);
static void vlan_input(struct ifnet *ifp, struct mbuf *m);
static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr);
static int vlan_setflag(struct ifnet *ifp, int flag, int status,
int (*func)(struct ifnet *, int));
static int vlan_setflags(struct ifnet *ifp, int status);
static int vlan_setmulti(struct ifnet *ifp);
static void vlan_unconfig(struct ifnet *ifp);
static void vlan_unconfig_locked(struct ifnet *ifp);
static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag);
static void vlan_link_state(struct ifnet *ifp);
static void vlan_capabilities(struct ifvlan *ifv);
static void vlan_trunk_capabilities(struct ifnet *ifp);
static struct ifnet *vlan_clone_match_ethertag(struct if_clone *,
const char *, int *);
static int vlan_clone_match(struct if_clone *, const char *);
static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t);
static int vlan_clone_destroy(struct if_clone *, struct ifnet *);
static void vlan_ifdetach(void *arg, struct ifnet *ifp);
static void vlan_iflladdr(void *arg, struct ifnet *ifp);
static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL,
IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy);
#ifdef VIMAGE
static VNET_DEFINE(struct if_clone, vlan_cloner);
#define V_vlan_cloner VNET(vlan_cloner)
#endif
#ifndef VLAN_ARRAY
#define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m))
static void
vlan_inithash(struct ifvlantrunk *trunk)
{
int i, n;
/*
* The trunk must not be locked here since we call malloc(M_WAITOK).
* It is OK in case this function is called before the trunk struct
* gets hooked up and becomes visible from other threads.
*/
KASSERT(trunk->hwidth == 0 && trunk->hash == NULL,
("%s: hash already initialized", __func__));
trunk->hwidth = VLAN_DEF_HWIDTH;
n = 1 << trunk->hwidth;
trunk->hmask = n - 1;
trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK);
for (i = 0; i < n; i++)
LIST_INIT(&trunk->hash[i]);
}
static void
vlan_freehash(struct ifvlantrunk *trunk)
{
#ifdef INVARIANTS
int i;
KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
for (i = 0; i < (1 << trunk->hwidth); i++)
KASSERT(LIST_EMPTY(&trunk->hash[i]),
("%s: hash table not empty", __func__));
#endif
free(trunk->hash, M_VLAN);
trunk->hash = NULL;
trunk->hwidth = trunk->hmask = 0;
}
static int
vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
{
int i, b;
struct ifvlan *ifv2;
TRUNK_LOCK_ASSERT(trunk);
KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
b = 1 << trunk->hwidth;
i = HASH(ifv->ifv_tag, trunk->hmask);
LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
if (ifv->ifv_tag == ifv2->ifv_tag)
return (EEXIST);
/*
* Grow the hash when the number of vlans exceeds half of the number of
* hash buckets squared. This will make the average linked-list length
* buckets/2.
*/
if (trunk->refcnt > (b * b) / 2) {
vlan_growhash(trunk, 1);
i = HASH(ifv->ifv_tag, trunk->hmask);
}
LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list);
trunk->refcnt++;
return (0);
}
static int
vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
{
int i, b;
struct ifvlan *ifv2;
TRUNK_LOCK_ASSERT(trunk);
KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
b = 1 << trunk->hwidth;
i = HASH(ifv->ifv_tag, trunk->hmask);
LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
if (ifv2 == ifv) {
trunk->refcnt--;
LIST_REMOVE(ifv2, ifv_list);
if (trunk->refcnt < (b * b) / 2)
vlan_growhash(trunk, -1);
return (0);
}
panic("%s: vlan not found\n", __func__);
return (ENOENT); /*NOTREACHED*/
}
/*
* Grow the hash larger or smaller if memory permits.
*/
static void
vlan_growhash(struct ifvlantrunk *trunk, int howmuch)
{
struct ifvlan *ifv;
struct ifvlanhead *hash2;
int hwidth2, i, j, n, n2;
TRUNK_LOCK_ASSERT(trunk);
KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
if (howmuch == 0) {
/* Harmless yet obvious coding error */
printf("%s: howmuch is 0\n", __func__);
return;
}
hwidth2 = trunk->hwidth + howmuch;
n = 1 << trunk->hwidth;
n2 = 1 << hwidth2;
/* Do not shrink the table below the default */
if (hwidth2 < VLAN_DEF_HWIDTH)
return;
/* M_NOWAIT because we're called with trunk mutex held */
hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT);
if (hash2 == NULL) {
printf("%s: out of memory -- hash size not changed\n",
__func__);
return; /* We can live with the old hash table */
}
for (j = 0; j < n2; j++)
LIST_INIT(&hash2[j]);
for (i = 0; i < n; i++)
while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) {
LIST_REMOVE(ifv, ifv_list);
j = HASH(ifv->ifv_tag, n2 - 1);
LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list);
}
free(trunk->hash, M_VLAN);
trunk->hash = hash2;
trunk->hwidth = hwidth2;
trunk->hmask = n2 - 1;
if (bootverbose)
if_printf(trunk->parent,
"VLAN hash table resized from %d to %d buckets\n", n, n2);
}
static __inline struct ifvlan *
vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag)
{
struct ifvlan *ifv;
TRUNK_LOCK_RASSERT(trunk);
LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list)
if (ifv->ifv_tag == tag)
return (ifv);
return (NULL);
}
#if 0
/* Debugging code to view the hashtables. */
static void
vlan_dumphash(struct ifvlantrunk *trunk)
{
int i;
struct ifvlan *ifv;
for (i = 0; i < (1 << trunk->hwidth); i++) {
printf("%d: ", i);
LIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
printf("%s ", ifv->ifv_ifp->if_xname);
printf("\n");
}
}
#endif /* 0 */
#endif /* !VLAN_ARRAY */
static void
trunk_destroy(struct ifvlantrunk *trunk)
{
VLAN_LOCK_ASSERT();
TRUNK_LOCK(trunk);
#ifndef VLAN_ARRAY
vlan_freehash(trunk);
#endif
trunk->parent->if_vlantrunk = NULL;
TRUNK_UNLOCK(trunk);
TRUNK_LOCK_DESTROY(trunk);
free(trunk, M_VLAN);
}
/*
* Program our multicast filter. What we're actually doing is
* programming the multicast filter of the parent. This has the
* side effect of causing the parent interface to receive multicast
* traffic that it doesn't really want, which ends up being discarded
* later by the upper protocol layers. Unfortunately, there's no way
* to avoid this: there really is only one physical interface.
*
* XXX: There is a possible race here if more than one thread is
* modifying the multicast state of the vlan interface at the same time.
*/
static int
vlan_setmulti(struct ifnet *ifp)
{
struct ifnet *ifp_p;
struct ifmultiaddr *ifma, *rifma = NULL;
struct ifvlan *sc;
struct vlan_mc_entry *mc;
struct sockaddr_dl sdl;
int error;
/*VLAN_LOCK_ASSERT();*/
/* Find the parent. */
sc = ifp->if_softc;
ifp_p = PARENT(sc);
CURVNET_SET_QUIET(ifp_p->if_vnet);
bzero((char *)&sdl, sizeof(sdl));
sdl.sdl_len = sizeof(sdl);
sdl.sdl_family = AF_LINK;
sdl.sdl_index = ifp_p->if_index;
sdl.sdl_type = IFT_ETHER;
sdl.sdl_alen = ETHER_ADDR_LEN;
/* First, remove any existing filter entries. */
while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) {
bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN);
error = if_delmulti(ifp_p, (struct sockaddr *)&sdl);
if (error)
return (error);
SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries);
free(mc, M_VLAN);
}
/* Now program new ones. */
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_LINK)
continue;
mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT);
if (mc == NULL)
return (ENOMEM);
bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
(char *)&mc->mc_addr, ETHER_ADDR_LEN);
SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries);
bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
LLADDR(&sdl), ETHER_ADDR_LEN);
error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma);
if (error)
return (error);
}
CURVNET_RESTORE();
return (0);
}
/*
* A handler for parent interface link layer address changes.
* If the parent interface link layer address is changed we
* should also change it on all children vlans.
*/
static void
vlan_iflladdr(void *arg __unused, struct ifnet *ifp)
{
struct ifvlan *ifv;
#ifndef VLAN_ARRAY
struct ifvlan *next;
#endif
int i;
/*
* Check if it's a trunk interface first of all
* to avoid needless locking.
*/
if (ifp->if_vlantrunk == NULL)
return;
VLAN_LOCK();
/*
* OK, it's a trunk. Loop over and change all vlan's lladdrs on it.
*/
#ifdef VLAN_ARRAY
for (i = 0; i < VLAN_ARRAY_SIZE; i++)
if ((ifv = ifp->if_vlantrunk->vlans[i])) {
#else /* VLAN_ARRAY */
for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++)
LIST_FOREACH_SAFE(ifv, &ifp->if_vlantrunk->hash[i], ifv_list, next) {
#endif /* VLAN_ARRAY */
VLAN_UNLOCK();
if_setlladdr(ifv->ifv_ifp, IF_LLADDR(ifp), ETHER_ADDR_LEN);
VLAN_LOCK();
}
VLAN_UNLOCK();
}
/*
* A handler for network interface departure events.
* Track departure of trunks here so that we don't access invalid
* pointers or whatever if a trunk is ripped from under us, e.g.,
* by ejecting its hot-plug card. However, if an ifnet is simply
* being renamed, then there's no need to tear down the state.
*/
static void
vlan_ifdetach(void *arg __unused, struct ifnet *ifp)
{
struct ifvlan *ifv;
int i;
/*
* Check if it's a trunk interface first of all
* to avoid needless locking.
*/
if (ifp->if_vlantrunk == NULL)
return;
/* If the ifnet is just being renamed, don't do anything. */
if (ifp->if_flags & IFF_RENAMING)
return;
VLAN_LOCK();
/*
* OK, it's a trunk. Loop over and detach all vlan's on it.
* Check trunk pointer after each vlan_unconfig() as it will
* free it and set to NULL after the last vlan was detached.
*/
#ifdef VLAN_ARRAY
for (i = 0; i < VLAN_ARRAY_SIZE; i++)
if ((ifv = ifp->if_vlantrunk->vlans[i])) {
vlan_unconfig_locked(ifv->ifv_ifp);
if (ifp->if_vlantrunk == NULL)
break;
}
#else /* VLAN_ARRAY */
restart:
for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++)
if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) {
vlan_unconfig_locked(ifv->ifv_ifp);
if (ifp->if_vlantrunk)
goto restart; /* trunk->hwidth can change */
else
break;
}
#endif /* VLAN_ARRAY */
/* Trunk should have been destroyed in vlan_unconfig(). */
KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__));
VLAN_UNLOCK();
}
/*
* VLAN support can be loaded as a module. The only place in the
* system that's intimately aware of this is ether_input. We hook
* into this code through vlan_input_p which is defined there and
* set here. Noone else in the system should be aware of this so
* we use an explicit reference here.
*/
extern void (*vlan_input_p)(struct ifnet *, struct mbuf *);
/* For if_link_state_change() eyes only... */
extern void (*vlan_link_state_p)(struct ifnet *);
static int
vlan_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
if (ifdetach_tag == NULL)
return (ENOMEM);
iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event,
vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
if (iflladdr_tag == NULL)
return (ENOMEM);
VLAN_LOCK_INIT();
vlan_input_p = vlan_input;
vlan_link_state_p = vlan_link_state;
vlan_trunk_cap_p = vlan_trunk_capabilities;
#ifndef VIMAGE
if_clone_attach(&vlan_cloner);
#endif
if (bootverbose)
printf("vlan: initialized, using "
#ifdef VLAN_ARRAY
"full-size arrays"
#else
"hash tables with chaining"
#endif
"\n");
break;
case MOD_UNLOAD:
#ifndef VIMAGE
if_clone_detach(&vlan_cloner);
#endif
EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag);
EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag);
vlan_input_p = NULL;
vlan_link_state_p = NULL;
vlan_trunk_cap_p = NULL;
VLAN_LOCK_DESTROY();
if (bootverbose)
printf("vlan: unloaded\n");
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t vlan_mod = {
"if_vlan",
vlan_modevent,
0
};
DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(if_vlan, 3);
#ifdef VIMAGE
static void
vnet_vlan_init(const void *unused __unused)
{
V_vlan_cloner = vlan_cloner;
if_clone_attach(&V_vlan_cloner);
}
VNET_SYSINIT(vnet_vlan_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
vnet_vlan_init, NULL);
static void
vnet_vlan_uninit(const void *unused __unused)
{
if_clone_detach(&V_vlan_cloner);
}
VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST,
vnet_vlan_uninit, NULL);
#endif
static struct ifnet *
vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag)
{
const char *cp;
struct ifnet *ifp;
int t;
/* Check for <etherif>.<vlan> style interface names. */
IFNET_RLOCK_NOSLEEP();
TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
if (ifp->if_type != IFT_ETHER)
continue;
if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0)
continue;
cp = name + strlen(ifp->if_xname);
if (*cp++ != '.')
continue;
if (*cp == '\0')
continue;
t = 0;
for(; *cp >= '0' && *cp <= '9'; cp++)
t = (t * 10) + (*cp - '0');
if (*cp != '\0')
continue;
if (tag != NULL)
*tag = t;
break;
}
IFNET_RUNLOCK_NOSLEEP();
return (ifp);
}
static int
vlan_clone_match(struct if_clone *ifc, const char *name)
{
const char *cp;
if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL)
return (1);
if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0)
return (0);
for (cp = name + 4; *cp != '\0'; cp++) {
if (*cp < '0' || *cp > '9')
return (0);
}
return (1);
}
static int
vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
{
char *dp;
int wildcard;
int unit;
int error;
int tag;
int ethertag;
struct ifvlan *ifv;
struct ifnet *ifp;
struct ifnet *p;
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
struct vlanreq vlr;
static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
/*
* There are 3 (ugh) ways to specify the cloned device:
* o pass a parameter block with the clone request.
* o specify parameters in the text of the clone device name
* o specify no parameters and get an unattached device that
* must be configured separately.
* The first technique is preferred; the latter two are
* supported for backwards compatibilty.
*/
if (params) {
error = copyin(params, &vlr, sizeof(vlr));
if (error)
return error;
p = ifunit(vlr.vlr_parent);
if (p == NULL)
return ENXIO;
/*
* Don't let the caller set up a VLAN tag with
* anything except VLID bits.
*/
if (vlr.vlr_tag & ~EVL_VLID_MASK)
return (EINVAL);
error = ifc_name2unit(name, &unit);
if (error != 0)
return (error);
ethertag = 1;
tag = vlr.vlr_tag;
wildcard = (unit < 0);
} else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) {
ethertag = 1;
unit = -1;
wildcard = 0;
/*
* Don't let the caller set up a VLAN tag with
* anything except VLID bits.
*/
if (tag & ~EVL_VLID_MASK)
return (EINVAL);
} else {
ethertag = 0;
error = ifc_name2unit(name, &unit);
if (error != 0)
return (error);
wildcard = (unit < 0);
}
error = ifc_alloc_unit(ifc, &unit);
if (error != 0)
return (error);
/* In the wildcard case, we need to update the name. */
if (wildcard) {
for (dp = name; *dp != '\0'; dp++);
if (snprintf(dp, len - (dp-name), "%d", unit) >
len - (dp-name) - 1) {
panic("%s: interface name too long", __func__);
}
}
ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO);
ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
ifc_free_unit(ifc, unit);
free(ifv, M_VLAN);
return (ENOSPC);
}
SLIST_INIT(&ifv->vlan_mc_listhead);
ifp->if_softc = ifv;
/*
* Set the name manually rather than using if_initname because
* we don't conform to the default naming convention for interfaces.
*/
strlcpy(ifp->if_xname, name, IFNAMSIZ);
ifp->if_dname = ifc->ifc_name;
ifp->if_dunit = unit;
/* NB: flags are not set here */
ifp->if_linkmib = &ifv->ifv_mib;
ifp->if_linkmiblen = sizeof(ifv->ifv_mib);
/* NB: mtu is not set here */
ifp->if_init = vlan_init;
ifp->if_start = vlan_start;
ifp->if_ioctl = vlan_ioctl;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_flags = VLAN_IFFLAGS;
ether_ifattach(ifp, eaddr);
/* Now undo some of the damage... */
ifp->if_baudrate = 0;
ifp->if_type = IFT_L2VLAN;
ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN;
ifa = ifp->if_addr;
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_L2VLAN;
if (ethertag) {
error = vlan_config(ifv, p, tag);
if (error != 0) {
/*
* Since we've partialy failed, we need to back
* out all the way, otherwise userland could get
* confused. Thus, we destroy the interface.
*/
ether_ifdetach(ifp);
vlan_unconfig(ifp);
if_free_type(ifp, IFT_ETHER);
ifc_free_unit(ifc, unit);
free(ifv, M_VLAN);
return (error);
}
/* Update flags on the parent, if necessary. */
vlan_setflags(ifp, 1);
}
return (0);
}
static int
vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
{
struct ifvlan *ifv = ifp->if_softc;
int unit = ifp->if_dunit;
ether_ifdetach(ifp); /* first, remove it from system-wide lists */
vlan_unconfig(ifp); /* now it can be unconfigured and freed */
if_free_type(ifp, IFT_ETHER);
free(ifv, M_VLAN);
ifc_free_unit(ifc, unit);
return (0);
}
/*
* The ifp->if_init entry point for vlan(4) is a no-op.
*/
static void
vlan_init(void *foo __unused)
{
}
/*
* The if_start method for vlan(4) interface. It doesn't
* raises the IFF_DRV_OACTIVE flag, since it is called
* only from IFQ_HANDOFF() macro in ether_output_frame().
* If the interface queue is full, and vlan_start() is
* not called, the queue would never get emptied and
* interface would stall forever.
*/
static void
vlan_start(struct ifnet *ifp)
{
struct ifvlan *ifv;
struct ifnet *p;
struct mbuf *m;
int error;
ifv = ifp->if_softc;
p = PARENT(ifv);
for (;;) {
IF_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
break;
BPF_MTAP(ifp, m);
/*
* Do not run parent's if_start() if the parent is not up,
* or parent's driver will cause a system crash.
*/
if (!UP_AND_RUNNING(p)) {
m_freem(m);
ifp->if_collisions++;
continue;
}
/*
* Pad the frame to the minimum size allowed if told to.
* This option is in accord with IEEE Std 802.1Q, 2003 Ed.,
* paragraph C.4.4.3.b. It can help to work around buggy
* bridges that violate paragraph C.4.4.3.a from the same
* document, i.e., fail to pad short frames after untagging.
* E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but
* untagging it will produce a 62-byte frame, which is a runt
* and requires padding. There are VLAN-enabled network
* devices that just discard such runts instead or mishandle
* them somehow.
*/
if (soft_pad) {
static char pad[8]; /* just zeros */
int n;
for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len;
n > 0; n -= sizeof(pad))
if (!m_append(m, min(n, sizeof(pad)), pad))
break;
if (n > 0) {
if_printf(ifp, "cannot pad short frame\n");
ifp->if_oerrors++;
m_freem(m);
continue;
}
}
/*
* If underlying interface can do VLAN tag insertion itself,
* just pass the packet along. However, we need some way to
* tell the interface where the packet came from so that it
* knows how to find the VLAN tag to use, so we attach a
* packet tag that holds it.
*/
if (p->if_capenable & IFCAP_VLAN_HWTAGGING) {
m->m_pkthdr.ether_vtag = ifv->ifv_tag;
m->m_flags |= M_VLANTAG;
} else {
m = ether_vlanencap(m, ifv->ifv_tag);
if (m == NULL) {
if_printf(ifp,
"unable to prepend VLAN header\n");
ifp->if_oerrors++;
continue;
}
}
/*
* Send it, precisely as ether_output() would have.
* We are already running at splimp.
*/
error = (p->if_transmit)(p, m);
if (!error)
ifp->if_opackets++;
else
ifp->if_oerrors++;
}
}
static void
vlan_input(struct ifnet *ifp, struct mbuf *m)
{
struct ifvlantrunk *trunk = ifp->if_vlantrunk;
struct ifvlan *ifv;
uint16_t tag;
KASSERT(trunk != NULL, ("%s: no trunk", __func__));
if (m->m_flags & M_VLANTAG) {
/*
* Packet is tagged, but m contains a normal
* Ethernet frame; the tag is stored out-of-band.
*/
tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag);
m->m_flags &= ~M_VLANTAG;
} else {
struct ether_vlan_header *evl;
/*
* Packet is tagged in-band as specified by 802.1q.
*/
switch (ifp->if_type) {
case IFT_ETHER:
if (m->m_len < sizeof(*evl) &&
(m = m_pullup(m, sizeof(*evl))) == NULL) {
if_printf(ifp, "cannot pullup VLAN header\n");
return;
}
evl = mtod(m, struct ether_vlan_header *);
tag = EVL_VLANOFTAG(ntohs(evl->evl_tag));
/*
* Remove the 802.1q header by copying the Ethernet
* addresses over it and adjusting the beginning of
* the data in the mbuf. The encapsulated Ethernet
* type field is already in place.
*/
bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
ETHER_HDR_LEN - ETHER_TYPE_LEN);
m_adj(m, ETHER_VLAN_ENCAP_LEN);
break;
default:
#ifdef INVARIANTS
panic("%s: %s has unsupported if_type %u",
__func__, ifp->if_xname, ifp->if_type);
#endif
m_freem(m);
ifp->if_noproto++;
return;
}
}
TRUNK_RLOCK(trunk);
#ifdef VLAN_ARRAY
ifv = trunk->vlans[tag];
#else
ifv = vlan_gethash(trunk, tag);
#endif
if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) {
TRUNK_RUNLOCK(trunk);
m_freem(m);
ifp->if_noproto++;
return;
}
TRUNK_RUNLOCK(trunk);
m->m_pkthdr.rcvif = ifv->ifv_ifp;
ifv->ifv_ifp->if_ipackets++;
/* Pass it back through the parent's input routine. */
(*ifp->if_input)(ifv->ifv_ifp, m);
}
static int
vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag)
{
struct ifvlantrunk *trunk;
struct ifnet *ifp;
int error = 0;
/* VID numbers 0x0 and 0xFFF are reserved */
if (tag == 0 || tag == 0xFFF)
return (EINVAL);
if (p->if_type != IFT_ETHER)
return (EPROTONOSUPPORT);
if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS)
return (EPROTONOSUPPORT);
if (ifv->ifv_trunk)
return (EBUSY);
if (p->if_vlantrunk == NULL) {
trunk = malloc(sizeof(struct ifvlantrunk),
M_VLAN, M_WAITOK | M_ZERO);
#ifndef VLAN_ARRAY
vlan_inithash(trunk);
#endif
VLAN_LOCK();
if (p->if_vlantrunk != NULL) {
/* A race that that is very unlikely to be hit. */
#ifndef VLAN_ARRAY
vlan_freehash(trunk);
#endif
free(trunk, M_VLAN);
goto exists;
}
TRUNK_LOCK_INIT(trunk);
TRUNK_LOCK(trunk);
p->if_vlantrunk = trunk;
trunk->parent = p;
} else {
VLAN_LOCK();
exists:
trunk = p->if_vlantrunk;
TRUNK_LOCK(trunk);
}
ifv->ifv_tag = tag; /* must set this before vlan_inshash() */
#ifdef VLAN_ARRAY
if (trunk->vlans[tag] != NULL) {
error = EEXIST;
goto done;
}
trunk->vlans[tag] = ifv;
trunk->refcnt++;
#else
error = vlan_inshash(trunk, ifv);
if (error)
goto done;
#endif
ifv->ifv_proto = ETHERTYPE_VLAN;
ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN;
ifv->ifv_mintu = ETHERMIN;
ifv->ifv_pflags = 0;
/*
* If the parent supports the VLAN_MTU capability,
* i.e. can Tx/Rx larger than ETHER_MAX_LEN frames,
* use it.
*/
if (p->if_capenable & IFCAP_VLAN_MTU) {
/*
* No need to fudge the MTU since the parent can
* handle extended frames.
*/
ifv->ifv_mtufudge = 0;
} else {
/*
* Fudge the MTU by the encapsulation size. This
* makes us incompatible with strictly compliant
* 802.1Q implementations, but allows us to use
* the feature with other NetBSD implementations,
* which might still be useful.
*/
ifv->ifv_mtufudge = ifv->ifv_encaplen;
}
ifv->ifv_trunk = trunk;
ifp = ifv->ifv_ifp;
ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge;
ifp->if_baudrate = p->if_baudrate;
/*
* Copy only a selected subset of flags from the parent.
* Other flags are none of our business.
*/
#define VLAN_COPY_FLAGS (IFF_SIMPLEX)
ifp->if_flags &= ~VLAN_COPY_FLAGS;
ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS;
#undef VLAN_COPY_FLAGS
ifp->if_link_state = p->if_link_state;
vlan_capabilities(ifv);
/*
* Set up our ``Ethernet address'' to reflect the underlying
* physical interface's.
*/
bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN);
/*
* Configure multicast addresses that may already be
* joined on the vlan device.
*/
(void)vlan_setmulti(ifp); /* XXX: VLAN lock held */
/* We are ready for operation now. */
ifp->if_drv_flags |= IFF_DRV_RUNNING;
done:
TRUNK_UNLOCK(trunk);
if (error == 0)
EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag);
VLAN_UNLOCK();
return (error);
}
static void
vlan_unconfig(struct ifnet *ifp)
{
VLAN_LOCK();
vlan_unconfig_locked(ifp);
VLAN_UNLOCK();
}
static void
vlan_unconfig_locked(struct ifnet *ifp)
{
struct ifvlantrunk *trunk;
struct vlan_mc_entry *mc;
struct ifvlan *ifv;
struct ifnet *parent;
VLAN_LOCK_ASSERT();
ifv = ifp->if_softc;
trunk = ifv->ifv_trunk;
parent = NULL;
if (trunk != NULL) {
struct sockaddr_dl sdl;
TRUNK_LOCK(trunk);
parent = trunk->parent;
/*
* Since the interface is being unconfigured, we need to
* empty the list of multicast groups that we may have joined
* while we were alive from the parent's list.
*/
bzero((char *)&sdl, sizeof(sdl));
sdl.sdl_len = sizeof(sdl);
sdl.sdl_family = AF_LINK;
sdl.sdl_index = parent->if_index;
sdl.sdl_type = IFT_ETHER;
sdl.sdl_alen = ETHER_ADDR_LEN;
while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) {
bcopy((char *)&mc->mc_addr, LLADDR(&sdl),
ETHER_ADDR_LEN);
/*
* This may fail if the parent interface is
* being detached. Regardless, we should do a
* best effort to free this interface as much
* as possible as all callers expect vlan
* destruction to succeed.
*/
(void)if_delmulti(parent, (struct sockaddr *)&sdl);
SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries);
free(mc, M_VLAN);
}
vlan_setflags(ifp, 0); /* clear special flags on parent */
#ifdef VLAN_ARRAY
trunk->vlans[ifv->ifv_tag] = NULL;
trunk->refcnt--;
#else
vlan_remhash(trunk, ifv);
#endif
ifv->ifv_trunk = NULL;
/*
* Check if we were the last.
*/
if (trunk->refcnt == 0) {
trunk->parent->if_vlantrunk = NULL;
/*
* XXXGL: If some ithread has already entered
* vlan_input() and is now blocked on the trunk
* lock, then it should preempt us right after
* unlock and finish its work. Then we will acquire
* lock again in trunk_destroy().
*/
TRUNK_UNLOCK(trunk);
trunk_destroy(trunk);
} else
TRUNK_UNLOCK(trunk);
}
/* Disconnect from parent. */
if (ifv->ifv_pflags)
if_printf(ifp, "%s: ifv_pflags unclean\n", __func__);
ifp->if_mtu = ETHERMTU;
ifp->if_link_state = LINK_STATE_UNKNOWN;
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
/*
* Only dispatch an event if vlan was
* attached, otherwise there is nothing
* to cleanup anyway.
*/
if (parent != NULL)
EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag);
}
/* Handle a reference counted flag that should be set on the parent as well */
static int
vlan_setflag(struct ifnet *ifp, int flag, int status,
int (*func)(struct ifnet *, int))
{
struct ifvlan *ifv;
int error;
/* XXX VLAN_LOCK_ASSERT(); */
ifv = ifp->if_softc;
status = status ? (ifp->if_flags & flag) : 0;
/* Now "status" contains the flag value or 0 */
/*
* See if recorded parent's status is different from what
* we want it to be. If it is, flip it. We record parent's
* status in ifv_pflags so that we won't clear parent's flag
* we haven't set. In fact, we don't clear or set parent's
* flags directly, but get or release references to them.
* That's why we can be sure that recorded flags still are
* in accord with actual parent's flags.
*/
if (status != (ifv->ifv_pflags & flag)) {
error = (*func)(PARENT(ifv), status);
if (error)
return (error);
ifv->ifv_pflags &= ~flag;
ifv->ifv_pflags |= status;
}
return (0);
}
/*
* Handle IFF_* flags that require certain changes on the parent:
* if "status" is true, update parent's flags respective to our if_flags;
* if "status" is false, forcedly clear the flags set on parent.
*/
static int
vlan_setflags(struct ifnet *ifp, int status)
{
int error, i;
for (i = 0; vlan_pflags[i].flag; i++) {
error = vlan_setflag(ifp, vlan_pflags[i].flag,
status, vlan_pflags[i].func);
if (error)
return (error);
}
return (0);
}
/* Inform all vlans that their parent has changed link state */
static void
vlan_link_state(struct ifnet *ifp)
{
struct ifvlantrunk *trunk = ifp->if_vlantrunk;
struct ifvlan *ifv;
int i;
TRUNK_LOCK(trunk);
#ifdef VLAN_ARRAY
for (i = 0; i < VLAN_ARRAY_SIZE; i++)
if (trunk->vlans[i] != NULL) {
ifv = trunk->vlans[i];
#else
for (i = 0; i < (1 << trunk->hwidth); i++)
LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) {
#endif
ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate;
if_link_state_change(ifv->ifv_ifp,
trunk->parent->if_link_state);
}
TRUNK_UNLOCK(trunk);
}
static void
vlan_capabilities(struct ifvlan *ifv)
{
struct ifnet *p = PARENT(ifv);
struct ifnet *ifp = ifv->ifv_ifp;
TRUNK_LOCK_ASSERT(TRUNK(ifv));
/*
* If the parent interface can do checksum offloading
* on VLANs, then propagate its hardware-assisted
* checksumming flags. Also assert that checksum
* offloading requires hardware VLAN tagging.
*/
if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM;
if (p->if_capenable & IFCAP_VLAN_HWCSUM &&
p->if_capenable & IFCAP_VLAN_HWTAGGING) {
ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM;
ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP |
CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT);
} else {
ifp->if_capenable = 0;
ifp->if_hwassist = 0;
}
/*
* If the parent interface can do TSO on VLANs then
* propagate the hardware-assisted flag. TSO on VLANs
* does not necessarily require hardware VLAN tagging.
*/
if (p->if_capabilities & IFCAP_VLAN_HWTSO)
ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO;
if (p->if_capenable & IFCAP_VLAN_HWTSO) {
ifp->if_capenable |= p->if_capenable & IFCAP_TSO;
ifp->if_hwassist |= p->if_hwassist & CSUM_TSO;
} else {
ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO);
ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO);
}
}
static void
vlan_trunk_capabilities(struct ifnet *ifp)
{
struct ifvlantrunk *trunk = ifp->if_vlantrunk;
struct ifvlan *ifv;
int i;
TRUNK_LOCK(trunk);
#ifdef VLAN_ARRAY
for (i = 0; i < VLAN_ARRAY_SIZE; i++)
if (trunk->vlans[i] != NULL) {
ifv = trunk->vlans[i];
#else
for (i = 0; i < (1 << trunk->hwidth); i++) {
LIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
#endif
vlan_capabilities(ifv);
}
TRUNK_UNLOCK(trunk);
}
static int
vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ifnet *p;
struct ifreq *ifr;
struct ifvlan *ifv;
struct vlanreq vlr;
int error = 0;
ifr = (struct ifreq *)data;
ifv = ifp->if_softc;
switch (cmd) {
case SIOCGIFMEDIA:
VLAN_LOCK();
if (TRUNK(ifv) != NULL) {
p = PARENT(ifv);
VLAN_UNLOCK();
error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data);
/* Limit the result to the parent's current config. */
if (error == 0) {
struct ifmediareq *ifmr;
ifmr = (struct ifmediareq *)data;
if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) {
ifmr->ifm_count = 1;
error = copyout(&ifmr->ifm_current,
ifmr->ifm_ulist,
sizeof(int));
}
}
} else {
VLAN_UNLOCK();
error = EINVAL;
}
break;
case SIOCSIFMEDIA:
error = EINVAL;
break;
case SIOCSIFMTU:
/*
* Set the interface MTU.
*/
VLAN_LOCK();
if (TRUNK(ifv) != NULL) {
if (ifr->ifr_mtu >
(PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) ||
ifr->ifr_mtu <
(ifv->ifv_mintu - ifv->ifv_mtufudge))
error = EINVAL;
else
ifp->if_mtu = ifr->ifr_mtu;
} else
error = EINVAL;
VLAN_UNLOCK();
break;
case SIOCSETVLAN:
#ifdef VIMAGE
if (ifp->if_vnet != ifp->if_home_vnet) {
error = EPERM;
break;
}
#endif
error = copyin(ifr->ifr_data, &vlr, sizeof(vlr));
if (error)
break;
if (vlr.vlr_parent[0] == '\0') {
vlan_unconfig(ifp);
break;
}
p = ifunit(vlr.vlr_parent);
if (p == NULL) {
error = ENOENT;
break;
}
/*
* Don't let the caller set up a VLAN tag with
* anything except VLID bits.
*/
if (vlr.vlr_tag & ~EVL_VLID_MASK) {
error = EINVAL;
break;
}
error = vlan_config(ifv, p, vlr.vlr_tag);
if (error)
break;
/* Update flags on the parent, if necessary. */
vlan_setflags(ifp, 1);
break;
case SIOCGETVLAN:
#ifdef VIMAGE
if (ifp->if_vnet != ifp->if_home_vnet) {
error = EPERM;
break;
}
#endif
bzero(&vlr, sizeof(vlr));
VLAN_LOCK();
if (TRUNK(ifv) != NULL) {
strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname,
sizeof(vlr.vlr_parent));
vlr.vlr_tag = ifv->ifv_tag;
}
VLAN_UNLOCK();
error = copyout(&vlr, ifr->ifr_data, sizeof(vlr));
break;
case SIOCSIFFLAGS:
/*
* We should propagate selected flags to the parent,
* e.g., promiscuous mode.
*/
if (TRUNK(ifv) != NULL)
error = vlan_setflags(ifp, 1);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
/*
* If we don't have a parent, just remember the membership for
* when we do.
*/
if (TRUNK(ifv) != NULL)
error = vlan_setmulti(ifp);
break;
default:
error = ether_ioctl(ifp, cmd, data);
}
return (error);
}