364 lines
9.1 KiB
C
364 lines
9.1 KiB
C
/*
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* Copyright 1998 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: if_vlan.c,v 1.1 1998/03/18 01:40:12 wollman Exp $
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*/
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/*
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* if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs.
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* Might be extended some day to also handle IEEE 802.1p priority
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* tagging. This is sort of sneaky in the implementation, since
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* we need to pretend to be enough of an Ethernet implementation
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* to make arp work. The way we do this is by telling everyone
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* that we are an Ethernet, and then catch the packets that
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* ether_output() left on our output queue queue when it calls
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* if_start(), rewrite them for use by the real outgoing interface,
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* and ask it to send them.
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*/
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#include "vlan.h"
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#if NVLAN > 0
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#include "opt_inet.h"
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#include "bpfilter.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#if NBPFILTER > 0
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#include <net/bpf.h>
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#endif
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/if_vlan_var.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#endif
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SYSCTL_NODE(_net_link, IFT_8021_VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN");
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SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency");
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u_int vlan_proto = ETHERTYPE_VLAN;
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SYSCTL_INT(_net_link_vlan_link, VLANCTL_PROTO, proto, CTLFLAG_RW, &vlan_proto,
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0, "Ethernet protocol used for VLAN encapsulation");
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static struct ifvlan ifv_softc[NVLAN];
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static void vlan_start(struct ifnet *ifp);
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static void vlan_ifinit(void *foo);
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static int vlan_ioctl(struct ifnet *ifp, int cmd, caddr_t addr);
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static void
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vlaninit(void *dummy)
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{
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int i;
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for (i = 0; i < NVLAN; i++) {
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struct ifnet *ifp = &ifv_softc[i].ifv_if;
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ifp->if_softc = &ifv_softc[i];
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ifp->if_name = "vlan";
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ifp->if_unit = i;
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/* NB: flags are not set here */
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ifp->if_linkmib = &ifv_softc[i].ifv_mib;
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ifp->if_linkmiblen = sizeof ifv_softc[i].ifv_mib;
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/* NB: mtu is not set here */
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ifp->if_init = vlan_ifinit;
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ifp->if_start = vlan_start;
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ifp->if_ioctl = vlan_ioctl;
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ifp->if_output = ether_output;
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if_attach(ifp);
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ether_ifattach(ifp);
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#if NBPFILTER > 0
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bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
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#endif
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/* Now undo some of the damage... */
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ifp->if_data.ifi_type = IFT_8021_VLAN;
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ifp->if_data.ifi_hdrlen = EVL_ENCAPLEN;
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ifp->if_resolvemulti = 0;
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}
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}
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PSEUDO_SET(vlaninit, if_vlan);
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static void
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vlan_ifinit(void *foo)
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{
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;
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}
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static void
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vlan_start(struct ifnet *ifp)
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{
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struct ifvlan *ifv;
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struct ifnet *p;
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struct ether_vlan_header *evl;
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struct mbuf *m;
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ifv = ifp->if_softc;
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p = ifv->ifv_p;
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ifp->if_flags |= IFF_OACTIVE;
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for (;;) {
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IF_DEQUEUE(&ifp->if_snd, m);
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if (m == 0)
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break;
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#if NBPFILTER > 0
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if (ifp->if_bpf)
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bpf_mtap(ifp, m);
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#endif /* NBPFILTER > 0 */
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M_PREPEND(m, EVL_ENCAPLEN, M_DONTWAIT);
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if (m == 0)
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continue;
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/* M_PREPEND takes care of m_len, m_pkthdr.len for us */
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/*
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* Transform the Ethernet header into an Ethernet header
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* with 802.1Q encapsulation.
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*/
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bcopy(mtod(m, char *) + EVL_ENCAPLEN, mtod(m, char *),
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sizeof(struct ether_header));
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evl = mtod(m, struct ether_vlan_header *);
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evl->evl_proto = evl->evl_encap_proto;
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evl->evl_encap_proto = htons(vlan_proto);
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evl->evl_tag = htons(ifv->ifv_tag);
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printf("vlan_start: %*D\n", sizeof *evl, (char *)evl, ":");
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/*
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* Send it, precisely as ether_output() would have.
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* We are already running at splimp.
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*/
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if (IF_QFULL(&p->if_snd)) {
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IF_DROP(&p->if_snd);
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/* XXX stats */
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}
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IF_ENQUEUE(&p->if_snd, m);
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if ((p->if_flags & IFF_OACTIVE) == 0)
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p->if_start(p);
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}
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ifp->if_flags &= ~IFF_OACTIVE;
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}
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int
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vlan_input(struct ether_header *eh, struct mbuf *m)
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{
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int i;
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struct ifvlan *ifv;
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for (i = 0; i < NVLAN; i++) {
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ifv = &ifv_softc[i];
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if (m->m_pkthdr.rcvif == ifv->ifv_p
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&& (EVL_VLANOFTAG(ntohs(*mtod(m, u_int16_t *)))
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== ifv->ifv_tag))
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break;
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}
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if (i >= NVLAN || (ifv->ifv_if.if_flags & IFF_UP) == 0) {
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m_freem(m);
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return -1; /* so ether_input can take note */
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}
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/*
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* Having found a valid vlan interface corresponding to
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* the given source interface and vlan tag, remove the
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* encapsulation, and run the real packet through
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* ether_input() a second time (it had better be
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* reentrant!).
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*/
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m->m_pkthdr.rcvif = &ifv->ifv_if;
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eh->ether_type = mtod(m, u_int16_t *)[1];
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m->m_data += EVL_ENCAPLEN;
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m->m_len -= EVL_ENCAPLEN;
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m->m_pkthdr.len -= EVL_ENCAPLEN;
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#if NBPFILTER > 0
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if (ifv->ifv_if.if_bpf) {
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/*
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* Do the usual BPF fakery. Note that we don't support
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* promiscuous mode here, since it would require the
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* drivers to know about VLANs and we're not ready for
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* that yet.
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*/
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struct mbuf m0;
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m0.m_next = m;
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m0.m_len = sizeof(struct ether_header);
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m0.m_data = (char *)eh;
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bpf_mtap(&ifv->ifv_if, &m0);
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}
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#endif
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ether_input(&ifv->ifv_if, eh, m);
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return 0;
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}
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static int
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vlan_config(struct ifvlan *ifv, struct ifnet *p)
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{
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struct ifaddr *ifa1, *ifa2;
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struct sockaddr_dl *sdl1, *sdl2;
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if (p->if_data.ifi_type != IFT_ETHER)
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return EPROTONOSUPPORT;
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if (ifv->ifv_p)
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return EBUSY;
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ifv->ifv_p = p;
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if (p->if_data.ifi_hdrlen == sizeof(struct ether_vlan_header))
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ifv->ifv_if.if_mtu = p->if_mtu;
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else
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ifv->ifv_if.if_mtu = p->if_data.ifi_mtu - EVL_ENCAPLEN;
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/*
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* NB: we don't support multicast at this point.
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*/
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ifv->ifv_if.if_flags = (p->if_flags & ~IFF_MULTICAST); /* XXX */
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/*
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* Set up our ``Ethernet address'' to reflect the underlying
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* physical interface's.
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*/
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ifa1 = ifnet_addrs[ifv->ifv_if.if_index - 1];
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ifa2 = ifnet_addrs[p->if_index - 1];
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sdl1 = (struct sockaddr_dl *)ifa1->ifa_addr;
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sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr;
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sdl1->sdl_type = IFT_ETHER;
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sdl1->sdl_alen = ETHER_ADDR_LEN;
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bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN);
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bcopy(LLADDR(sdl2), ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN);
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return 0;
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}
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static int
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vlan_ioctl(struct ifnet *ifp, int cmd, caddr_t data)
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{
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struct ifaddr *ifa;
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struct ifnet *p;
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struct ifreq *ifr;
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struct ifvlan *ifv;
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struct vlanreq vlr;
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int error = 0;
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ifr = (struct ifreq *)data;
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ifa = (struct ifaddr *)data;
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ifv = ifp->if_softc;
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switch (cmd) {
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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switch (ifa->ifa_addr->sa_family) {
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#ifdef INET
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case AF_INET:
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arp_ifinit(&ifv->ifv_ac, ifa);
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break;
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#endif
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default:
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break;
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}
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break;
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case SIOCGIFADDR:
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{
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struct sockaddr *sa;
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sa = (struct sockaddr *) &ifr->ifr_data;
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bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
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(caddr_t) sa->sa_data, ETHER_ADDR_LEN);
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}
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break;
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case SIOCSIFMTU:
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/*
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* Set the interface MTU.
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*/
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if (ifr->ifr_mtu > ETHERMTU) {
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error = EINVAL;
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} else {
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ifp->if_mtu = ifr->ifr_mtu;
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}
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break;
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case SIOCSETVLAN:
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error = copyin(ifr->ifr_data, &vlr, sizeof vlr);
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if (error)
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break;
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if (vlr.vlr_parent[0] == '\0') {
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ifv->ifv_p = 0;
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if_down(ifp);
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break;
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}
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p = ifunit(vlr.vlr_parent);
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if (p == 0) {
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error = ENOENT;
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break;
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}
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error = vlan_config(ifv, p);
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if (error)
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break;
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ifv->ifv_tag = vlr.vlr_tag;
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break;
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case SIOCGETVLAN:
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bzero(&vlr, sizeof vlr);
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if (ifv->ifv_p) {
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sprintf(vlr.vlr_parent, "%s%d", ifv->ifv_p->if_name,
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ifv->ifv_p->if_unit);
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vlr.vlr_tag = ifv->ifv_tag;
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}
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error = copyout(&vlr, ifr->ifr_data, sizeof vlr);
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break;
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case SIOCSIFFLAGS:
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/*
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* We don't support all-multicast or promiscuous modes
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* right now because it would require help from the
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* underlying drivers, which hasn't been implemented.
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*/
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if (ifr->ifr_flags & (IFF_PROMISC|IFF_ALLMULTI)) {
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ifp->if_flags &= ~(IFF_PROMISC|IFF_ALLMULTI);
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error = EINVAL;
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}
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break;
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/* NB: this will reject multicast state changes */
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default:
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error = EINVAL;
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}
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return error;
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}
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#endif /* NVLAN > 0 */
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