/* $OpenBSD: if_vlan.c,v 1.4 2000/05/15 19:15:00 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 #include #include #include #include #include #include #include #include #include #include "bpfilter.h" #if NBPFILTER > 0 #include #endif #include #include #include #ifdef INET #include #include #endif #include 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: /* * XXX Set the interface MTU. * This is bogus. The underlying interface might support * jumbo frames. It would be nice to replace ETHERMTU * with the parent interface's MTU in the following statement. */ if (ifr->ifr_mtu > ETHERMTU || ifr->ifr_mtu < ETHERMIN) { 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; } if (vlr.vlr_tag != EVL_VLANOFTAG(vlr.vlr_tag)) { error = EINVAL; /* check for valid tag */ 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 */