if_vlan from FreeBSD and a few modifications

1 files changed, 568 insertions, 0 deletions

diff --git a/sys/net/if_vlan.c b/sys/net/if_vlan.c
new file mode 100644
index 00000000000..e9b76469364
--- /dev/null
+++ b/sys/net/if_vlan.c
@@ -0,0 +1,568 @@
+/*	$OpenBSD: if_vlan.c,v 1.1 2000/04/26 19:03:11 chris Exp $ */
+/*
+ * 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: src/sys/net/if_vlan.c,v 1.16 2000/03/26 15:21:40 charnier Exp $
+ */
+
+/*
+ * 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"
+#if NVLAN > 0
+
+#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 <sys/proc.h>
+
+#include "bpfilter.h"
+#if NBPFILTER > 0
+#include <net/bpf.h>
+#endif
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+
+#ifdef INET
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+#endif
+
+#include <net/if_vlan_var.h>
+
+struct	ifaddr	**ifnet_addrs;
+
+u_int	vlan_proto = ETHERTYPE_8021Q;
+
+struct ifvlan ifv_softc[NVLAN];
+
+extern int ifqmaxlen;
+
+void	vlan_start (struct ifnet *ifp);
+int	vlan_ioctl (struct ifnet *ifp, u_long cmd, caddr_t addr);
+int	vlan_setmulti (struct ifnet *ifp);
+int	vlan_unconfig (struct ifnet *ifp);
+int	vlan_config (struct ifvlan *ifv, struct ifnet *p);
+void	vlanattach (void *dummy);
+
+/*
+ * 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.
+ */
+
+int vlan_setmulti(struct ifnet *ifp)
+{
+	struct ifreq		*ifr_p;
+	struct ether_multi	*enm;
+	struct ether_multistep	step;
+	struct ifvlan		*sc;
+	struct vlan_mc_entry	*mc = NULL;
+	int			error;
+
+	/* Find the parent. */
+	sc = ifp->if_softc;
+	ifr_p = (struct ifreq *)&sc->ifv_p->if_data;
+
+	/* First, remove any existing filter entries. */
+	while(sc->vlan_mc_listhead.slh_first != NULL) {
+		mc = sc->vlan_mc_listhead.slh_first;
+		error = ether_delmulti(ifr_p, &sc->ifv_ac);
+		if (error)
+			return(error);
+		SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries);
+		free(mc, M_DEVBUF);
+	}
+
+	/* Now program new ones. */
+	ETHER_FIRST_MULTI(step, &sc->ifv_ac, enm);
+	while (enm != NULL) {
+		mc = malloc(sizeof(struct vlan_mc_entry), M_DEVBUF, M_NOWAIT);
+		bcopy(enm->enm_addrlo,
+		      (void *) &mc->mc_addr, ETHER_ADDR_LEN);
+		SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries);
+		error = ether_addmulti(ifr_p, &sc->ifv_ac);
+		if (error)
+			return(error);
+		ETHER_NEXT_MULTI(step, enm);
+	}
+
+	return(0);
+}
+
+void
+vlanattach(void *dummy)
+{
+	struct ifnet *ifp;
+	int i;
+
+	bzero(ifv_softc, sizeof(ifv_softc));
+
+	for (i = 0; i < NVLAN; i++) {
+		ifp = &ifv_softc[i].ifv_if;
+		ifp->if_softc = &ifv_softc[i];
+		sprintf(ifp->if_xname, "vlan%d", i);
+		/* NB: flags are not set here */
+		/* NB: mtu is not set here */
+
+		ifp->if_start = vlan_start;
+		ifp->if_ioctl = vlan_ioctl;
+		ifp->if_output = ether_output;
+		ifp->if_snd.ifq_maxlen = ifqmaxlen;
+		if_attach(ifp);
+		ether_ifattach(ifp);
+#if NBPFILTER > 0
+		bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header));
+#endif
+		/* Now undo some of the damage... */
+		ifp->if_data.ifi_type = IFT_8021_VLAN;
+		ifp->if_data.ifi_hdrlen = EVL_ENCAPLEN;
+	}
+}
+
+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 NBPFILTER > 0
+		if (ifp->if_bpf)
+			bpf_mtap(ifp->if_bpf, m);
+#endif
+
+		/*
+		 * 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("%s: M_PREPEND failed", ifv->ifv_p->if_xname);
+				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("%s: m_pullup failed", ifv->ifv_p->if_xname);
+				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_QFULL(&p->if_snd)) {
+			IF_DROP(&p->if_snd);
+				/* XXX stats */
+			ifp->if_oerrors++;
+			m_freem(m);
+			continue;
+		}
+		IF_ENQUEUE(&p->if_snd, m);
+		if ((p->if_flags & IFF_OACTIVE) == 0) {
+			p->if_start(p);
+			ifp->if_opackets++;
+		}
+	}
+	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|IFF_RUNNING)) !=
+	    (IFF_UP|IFF_RUNNING)) {
+		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;
+
+#if NBPFILTER > 0
+	if (ifv->ifv_if.if_bpf) {
+		/*
+		 * Do the usual BPF fakery.  Note that we don't support
+		 * promiscuous mode here, since it would require the
+		 * drivers to know about VLANs and we're not ready for
+		 * that yet.
+		 */
+		struct mbuf m0;
+		m0.m_next = m;
+		m0.m_len = sizeof(struct ether_header);
+		m0.m_data = (char *)eh;
+		bpf_mtap(ifv->ifv_if.if_bpf, &m0);
+	}
+#endif
+	ifv->ifv_if.if_ipackets++;
+	ether_input(&ifv->ifv_if, eh, m);
+	return 0;
+}
+
+int
+vlan_input(eh, m)
+	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|IFF_RUNNING)) !=
+	    (IFF_UP|IFF_RUNNING)) {
+		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;
+
+#if NBPFILTER > 0
+	if (ifv->ifv_if.if_bpf) {
+		/*
+		 * Do the usual BPF fakery.  Note that we don't support
+		 * promiscuous mode here, since it would require the
+		 * drivers to know about VLANs and we're not ready for
+		 * that yet.
+		 */
+		struct mbuf m0;
+		m0.m_next = m;
+		m0.m_len = sizeof(struct ether_header);
+		m0.m_data = (char *)eh;
+		bpf_mtap(ifv->ifv_if.if_bpf, &m0);
+	}
+#endif
+	ifv->ifv_if.if_ipackets++;
+	ether_input(&ifv->ifv_if, eh, m);
+
+	return 0;
+}
+
+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;
+	ifv->ifv_if.if_mtu = p->if_data.ifi_mtu;
+
+	/*
+	 * 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];
+	ifa2 = ifnet_addrs[p->if_index];
+	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;
+}
+
+int
+vlan_unconfig(struct ifnet *ifp)
+{
+	struct ifaddr *ifa;
+	struct sockaddr_dl *sdl;
+	struct ifvlan *ifv;
+	struct ifnet *p;
+	struct ifreq *ifr, *ifr_p;
+	struct vlan_mc_entry *mc;
+	int error;
+
+	ifv = ifp->if_softc;
+	p = ifv->ifv_p;
+	ifr = (struct ifreq *)&ifp->if_data;
+	ifr_p = (struct ifreq *)&ifv->ifv_p->if_data;
+
+	/*
+ 	 * 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) {
+
+		mc = ifv->vlan_mc_listhead.slh_first;
+		error = ether_delmulti(ifr_p, &ifv->ifv_ac);
+		error = ether_delmulti(ifr, &ifv->ifv_ac);
+		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];
+	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;
+}
+
+int
+vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+	struct proc *p = curproc;	/* XXX */
+	struct ifaddr *ifa;
+	struct ifnet *pr;
+	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 ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
+			break;
+		if (ifr->ifr_mtu > ETHERMTU) {
+			error = EINVAL;
+		} else {
+			ifp->if_mtu = ifr->ifr_mtu;
+		}
+		break;
+
+	case SIOCSETVLAN:
+		if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
+			break;
+		if ((error = copyin(ifr->ifr_data, &vlr, sizeof vlr)))
+			break;
+		if (vlr.vlr_parent[0] == '\0') {
+			vlan_unconfig(ifp);
+			if_down(ifp);
+			ifp->if_flags &= ~(IFF_UP|IFF_RUNNING);
+			break;
+		}
+		pr = ifunit(vlr.vlr_parent);
+		if (pr == 0) {
+			error = ENOENT;
+			break;
+		}
+		error = vlan_config(ifv, pr);
+		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", ifv->ifv_p->if_xname);
+			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;
+}
+
+#endif /* NVLAN > 0 */