mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
df5e198723
before adding/removing packets from the queue. Also, the if_obytes and if_omcasts fields should only be manipulated under protection of the mutex. IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on the queue. An IF_LOCK macro is provided, as well as the old (mutex-less) versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which needs them, but their use is discouraged. Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF, which takes care of locking/enqueue, and also statistics updating/start if necessary.
529 lines
14 KiB
C
529 lines
14 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
*
|
|
* XXX It's incorrect to assume that we must always kludge up
|
|
* headers on the physical device's behalf: some devices support
|
|
* VLAN tag insersion and extraction in firmware. For these cases,
|
|
* one can change the behavior of the vlan interface by setting
|
|
* the LINK0 flag on it (that is setting the vlan interface's LINK0
|
|
* flag, _not_ the parent's LINK0 flag; we try to leave the parent
|
|
* alone). If the interface as the LINK0 flag set, then it will
|
|
* not modify the ethernet header on output because the parent
|
|
* can do that for itself. On input, the parent can call vlan_input_tag()
|
|
* directly in order to supply us with an incoming mbuf and the vlan
|
|
* tag value that goes with it.
|
|
*/
|
|
|
|
#include "vlan.h"
|
|
#include "opt_inet.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.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_arp.h>
|
|
#include <net/if_dl.h>
|
|
#include <net/if_types.h>
|
|
#include <net/if_vlan_var.h>
|
|
|
|
#ifdef INET
|
|
#include <netinet/in.h>
|
|
#include <netinet/if_ether.h>
|
|
#endif
|
|
|
|
SYSCTL_DECL(_net_link);
|
|
SYSCTL_NODE(_net_link, IFT_8021_VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN");
|
|
SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency");
|
|
|
|
u_int vlan_proto = ETHERTYPE_VLAN;
|
|
SYSCTL_INT(_net_link_vlan_link, VLANCTL_PROTO, proto, CTLFLAG_RW, &vlan_proto,
|
|
0, "Ethernet protocol used for VLAN encapsulation");
|
|
|
|
static struct ifvlan ifv_softc[NVLAN];
|
|
|
|
static void vlan_start(struct ifnet *ifp);
|
|
static void vlan_ifinit(void *foo);
|
|
static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr);
|
|
static int vlan_setmulti(struct ifnet *ifp);
|
|
static int vlan_unconfig(struct ifnet *ifp);
|
|
static int vlan_config(struct ifvlan *ifv, struct ifnet *p);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int vlan_setmulti(struct ifnet *ifp)
|
|
{
|
|
struct ifnet *ifp_p;
|
|
struct ifmultiaddr *ifma, *rifma = NULL;
|
|
struct ifvlan *sc;
|
|
struct vlan_mc_entry *mc = NULL;
|
|
struct sockaddr_dl sdl;
|
|
int error;
|
|
|
|
/* Find the parent. */
|
|
sc = ifp->if_softc;
|
|
ifp_p = sc->ifv_p;
|
|
|
|
sdl.sdl_len = ETHER_ADDR_LEN;
|
|
sdl.sdl_family = AF_LINK;
|
|
|
|
/* First, remove any existing filter entries. */
|
|
while(sc->vlan_mc_listhead.slh_first != NULL) {
|
|
mc = sc->vlan_mc_listhead.slh_first;
|
|
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_DEVBUF);
|
|
}
|
|
|
|
/* Now program new ones. */
|
|
for (ifma = ifp->if_multiaddrs.lh_first;
|
|
ifma != NULL;ifma = ifma->ifma_link.le_next) {
|
|
if (ifma->ifma_addr->sa_family != AF_LINK)
|
|
continue;
|
|
mc = malloc(sizeof(struct vlan_mc_entry), M_DEVBUF, M_NOWAIT);
|
|
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);
|
|
error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma);
|
|
if (error)
|
|
return(error);
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
static void
|
|
vlaninit(void *dummy)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NVLAN; i++) {
|
|
struct ifnet *ifp = &ifv_softc[i].ifv_if;
|
|
|
|
ifp->if_softc = &ifv_softc[i];
|
|
ifp->if_name = "vlan";
|
|
ifp->if_unit = i;
|
|
/* NB: flags are not set here */
|
|
ifp->if_linkmib = &ifv_softc[i].ifv_mib;
|
|
ifp->if_linkmiblen = sizeof ifv_softc[i].ifv_mib;
|
|
/* NB: mtu is not set here */
|
|
|
|
ifp->if_init = vlan_ifinit;
|
|
ifp->if_start = vlan_start;
|
|
ifp->if_ioctl = vlan_ioctl;
|
|
ifp->if_output = ether_output;
|
|
ifp->if_snd.ifq_maxlen = ifqmaxlen;
|
|
ether_ifattach(ifp, ETHER_BPF_SUPPORTED);
|
|
/* Now undo some of the damage... */
|
|
ifp->if_data.ifi_type = IFT_8021_VLAN;
|
|
ifp->if_data.ifi_hdrlen = EVL_ENCAPLEN;
|
|
ifp->if_resolvemulti = 0;
|
|
}
|
|
}
|
|
PSEUDO_SET(vlaninit, if_vlan);
|
|
|
|
static void
|
|
vlan_ifinit(void *foo)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void
|
|
vlan_start(struct ifnet *ifp)
|
|
{
|
|
struct ifvlan *ifv;
|
|
struct ifnet *p;
|
|
struct ether_vlan_header *evl;
|
|
struct mbuf *m;
|
|
|
|
ifv = ifp->if_softc;
|
|
p = ifv->ifv_p;
|
|
|
|
ifp->if_flags |= IFF_OACTIVE;
|
|
for (;;) {
|
|
IF_DEQUEUE(&ifp->if_snd, m);
|
|
if (m == 0)
|
|
break;
|
|
if (ifp->if_bpf)
|
|
bpf_mtap(ifp, m);
|
|
|
|
/*
|
|
* If the LINK0 flag is set, it means the underlying interface
|
|
* can do VLAN tag insertion itself and doesn't require us to
|
|
* create a special header for it. In this case, we 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 set the rcvif in the
|
|
* mbuf header to our ifnet.
|
|
*
|
|
* Note: we also set the M_PROTO1 flag in the mbuf to let
|
|
* the parent driver know that the rcvif pointer is really
|
|
* valid. We need to do this because sometimes mbufs will
|
|
* be allocated by other parts of the system that contain
|
|
* garbage in the rcvif pointer. Using the M_PROTO1 flag
|
|
* lets the driver perform a proper sanity check and avoid
|
|
* following potentially bogus rcvif pointers off into
|
|
* never-never land.
|
|
*/
|
|
if (ifp->if_flags & IFF_LINK0) {
|
|
m->m_pkthdr.rcvif = ifp;
|
|
m->m_flags |= M_PROTO1;
|
|
} else {
|
|
M_PREPEND(m, EVL_ENCAPLEN, M_DONTWAIT);
|
|
if (m == NULL) {
|
|
printf("vlan%d: M_PREPEND failed", ifp->if_unit);
|
|
ifp->if_ierrors++;
|
|
continue;
|
|
}
|
|
/* M_PREPEND takes care of m_len, m_pkthdr.len for us */
|
|
|
|
m = m_pullup(m, ETHER_HDR_LEN + EVL_ENCAPLEN);
|
|
if (m == NULL) {
|
|
printf("vlan%d: m_pullup failed", ifp->if_unit);
|
|
ifp->if_ierrors++;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Transform the Ethernet header into an Ethernet header
|
|
* with 802.1Q encapsulation.
|
|
*/
|
|
bcopy(mtod(m, char *) + EVL_ENCAPLEN, mtod(m, char *),
|
|
sizeof(struct ether_header));
|
|
evl = mtod(m, struct ether_vlan_header *);
|
|
evl->evl_proto = evl->evl_encap_proto;
|
|
evl->evl_encap_proto = htons(vlan_proto);
|
|
evl->evl_tag = htons(ifv->ifv_tag);
|
|
#ifdef DEBUG
|
|
printf("vlan_start: %*D\n", sizeof *evl,
|
|
(char *)evl, ":");
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Send it, precisely as ether_output() would have.
|
|
* We are already running at splimp.
|
|
*/
|
|
if (IF_HANDOFF(&p->if_snd, m, p))
|
|
ifp->if_opackets++;
|
|
else
|
|
ifp->if_oerrors++;
|
|
}
|
|
ifp->if_flags &= ~IFF_OACTIVE;
|
|
|
|
return;
|
|
}
|
|
|
|
int
|
|
vlan_input_tag(struct ether_header *eh, struct mbuf *m, u_int16_t t)
|
|
{
|
|
int i;
|
|
struct ifvlan *ifv;
|
|
|
|
for (i = 0; i < NVLAN; i++) {
|
|
ifv = &ifv_softc[i];
|
|
if (ifv->ifv_tag == t)
|
|
break;
|
|
}
|
|
|
|
if (i >= NVLAN || (ifv->ifv_if.if_flags & IFF_UP) == 0) {
|
|
m_free(m);
|
|
return -1; /* So the parent can take note */
|
|
}
|
|
|
|
/*
|
|
* Having found a valid vlan interface corresponding to
|
|
* the given source interface and vlan tag, run the
|
|
* the real packet through ethert_input().
|
|
*/
|
|
m->m_pkthdr.rcvif = &ifv->ifv_if;
|
|
|
|
ifv->ifv_if.if_ipackets++;
|
|
ether_input(&ifv->ifv_if, eh, m);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
vlan_input(struct ether_header *eh, struct mbuf *m)
|
|
{
|
|
int i;
|
|
struct ifvlan *ifv;
|
|
|
|
for (i = 0; i < NVLAN; i++) {
|
|
ifv = &ifv_softc[i];
|
|
if (m->m_pkthdr.rcvif == ifv->ifv_p
|
|
&& (EVL_VLANOFTAG(ntohs(*mtod(m, u_int16_t *)))
|
|
== ifv->ifv_tag))
|
|
break;
|
|
}
|
|
|
|
if (i >= NVLAN || (ifv->ifv_if.if_flags & IFF_UP) == 0) {
|
|
m_freem(m);
|
|
return -1; /* so ether_input can take note */
|
|
}
|
|
|
|
/*
|
|
* Having found a valid vlan interface corresponding to
|
|
* the given source interface and vlan tag, remove the
|
|
* encapsulation, and run the real packet through
|
|
* ether_input() a second time (it had better be
|
|
* reentrant!).
|
|
*/
|
|
m->m_pkthdr.rcvif = &ifv->ifv_if;
|
|
eh->ether_type = mtod(m, u_int16_t *)[1];
|
|
m->m_data += EVL_ENCAPLEN;
|
|
m->m_len -= EVL_ENCAPLEN;
|
|
m->m_pkthdr.len -= EVL_ENCAPLEN;
|
|
|
|
ifv->ifv_if.if_ipackets++;
|
|
ether_input(&ifv->ifv_if, eh, m);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vlan_config(struct ifvlan *ifv, struct ifnet *p)
|
|
{
|
|
struct ifaddr *ifa1, *ifa2;
|
|
struct sockaddr_dl *sdl1, *sdl2;
|
|
|
|
if (p->if_data.ifi_type != IFT_ETHER)
|
|
return EPROTONOSUPPORT;
|
|
if (ifv->ifv_p)
|
|
return EBUSY;
|
|
ifv->ifv_p = p;
|
|
if (p->if_data.ifi_hdrlen == sizeof(struct ether_vlan_header))
|
|
ifv->ifv_if.if_mtu = p->if_mtu;
|
|
else
|
|
ifv->ifv_if.if_mtu = p->if_data.ifi_mtu - EVL_ENCAPLEN;
|
|
|
|
/*
|
|
* Preserve the state of the LINK0 flag for ourselves.
|
|
*/
|
|
ifv->ifv_if.if_flags = (p->if_flags & ~(IFF_LINK0));
|
|
|
|
/*
|
|
* Set up our ``Ethernet address'' to reflect the underlying
|
|
* physical interface's.
|
|
*/
|
|
ifa1 = ifnet_addrs[ifv->ifv_if.if_index - 1];
|
|
ifa2 = ifnet_addrs[p->if_index - 1];
|
|
sdl1 = (struct sockaddr_dl *)ifa1->ifa_addr;
|
|
sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr;
|
|
sdl1->sdl_type = IFT_ETHER;
|
|
sdl1->sdl_alen = ETHER_ADDR_LEN;
|
|
bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN);
|
|
bcopy(LLADDR(sdl2), ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vlan_unconfig(struct ifnet *ifp)
|
|
{
|
|
struct ifaddr *ifa;
|
|
struct sockaddr_dl *sdl;
|
|
struct vlan_mc_entry *mc;
|
|
struct ifvlan *ifv;
|
|
struct ifnet *p;
|
|
int error;
|
|
|
|
ifv = ifp->if_softc;
|
|
p = ifv->ifv_p;
|
|
|
|
/*
|
|
* Since the interface is being unconfigured, we need to
|
|
* empty the list of multicast groups that we may have joined
|
|
* while we were alive and remove them from the parent's list
|
|
* as well.
|
|
*/
|
|
while(ifv->vlan_mc_listhead.slh_first != NULL) {
|
|
struct sockaddr_dl sdl;
|
|
|
|
sdl.sdl_len = ETHER_ADDR_LEN;
|
|
sdl.sdl_family = AF_LINK;
|
|
mc = ifv->vlan_mc_listhead.slh_first;
|
|
bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN);
|
|
error = if_delmulti(p, (struct sockaddr *)&sdl);
|
|
error = if_delmulti(ifp, (struct sockaddr *)&sdl);
|
|
if (error)
|
|
return(error);
|
|
SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries);
|
|
free(mc, M_DEVBUF);
|
|
}
|
|
|
|
/* Disconnect from parent. */
|
|
ifv->ifv_p = NULL;
|
|
ifv->ifv_if.if_mtu = ETHERMTU;
|
|
|
|
/* Clear our MAC address. */
|
|
ifa = ifnet_addrs[ifv->ifv_if.if_index - 1];
|
|
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
|
|
sdl->sdl_type = IFT_ETHER;
|
|
sdl->sdl_alen = ETHER_ADDR_LEN;
|
|
bzero(LLADDR(sdl), ETHER_ADDR_LEN);
|
|
bzero(ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
struct ifaddr *ifa;
|
|
struct ifnet *p;
|
|
struct ifreq *ifr;
|
|
struct ifvlan *ifv;
|
|
struct vlanreq vlr;
|
|
int error = 0;
|
|
|
|
ifr = (struct ifreq *)data;
|
|
ifa = (struct ifaddr *)data;
|
|
ifv = ifp->if_softc;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFADDR:
|
|
ifp->if_flags |= IFF_UP;
|
|
|
|
switch (ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
arp_ifinit(&ifv->ifv_ac, ifa);
|
|
break;
|
|
#endif
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SIOCGIFADDR:
|
|
{
|
|
struct sockaddr *sa;
|
|
|
|
sa = (struct sockaddr *) &ifr->ifr_data;
|
|
bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
|
|
(caddr_t) sa->sa_data, ETHER_ADDR_LEN);
|
|
}
|
|
break;
|
|
|
|
case SIOCSIFMTU:
|
|
/*
|
|
* Set the interface MTU.
|
|
* This is bogus. The underlying interface might support
|
|
* jumbo frames.
|
|
*/
|
|
if (ifr->ifr_mtu > ETHERMTU) {
|
|
error = EINVAL;
|
|
} else {
|
|
ifp->if_mtu = ifr->ifr_mtu;
|
|
}
|
|
break;
|
|
|
|
case SIOCSETVLAN:
|
|
error = copyin(ifr->ifr_data, &vlr, sizeof vlr);
|
|
if (error)
|
|
break;
|
|
if (vlr.vlr_parent[0] == '\0') {
|
|
vlan_unconfig(ifp);
|
|
if_down(ifp);
|
|
ifp->if_flags &= ~(IFF_UP|IFF_RUNNING);
|
|
break;
|
|
}
|
|
p = ifunit(vlr.vlr_parent);
|
|
if (p == 0) {
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
error = vlan_config(ifv, p);
|
|
if (error)
|
|
break;
|
|
ifv->ifv_tag = vlr.vlr_tag;
|
|
ifp->if_flags |= IFF_RUNNING;
|
|
break;
|
|
|
|
case SIOCGETVLAN:
|
|
bzero(&vlr, sizeof vlr);
|
|
if (ifv->ifv_p) {
|
|
snprintf(vlr.vlr_parent, sizeof(vlr.vlr_parent),
|
|
"%s%d", ifv->ifv_p->if_name, ifv->ifv_p->if_unit);
|
|
vlr.vlr_tag = ifv->ifv_tag;
|
|
}
|
|
error = copyout(&vlr, ifr->ifr_data, sizeof vlr);
|
|
break;
|
|
|
|
case SIOCSIFFLAGS:
|
|
/*
|
|
* We don't support promiscuous mode
|
|
* right now because it would require help from the
|
|
* underlying drivers, which hasn't been implemented.
|
|
*/
|
|
if (ifr->ifr_flags & (IFF_PROMISC)) {
|
|
ifp->if_flags &= ~(IFF_PROMISC);
|
|
error = EINVAL;
|
|
}
|
|
break;
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
error = vlan_setmulti(ifp);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
}
|
|
return error;
|
|
}
|