/* $OpenBSD: if_enc.c,v 1.67 2017/01/23 11:37:29 mpi Exp $ */ /* * Copyright (c) 2010 Reyk Floeter * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "enc.h" #include "bpfilter.h" #include #include #include #include #include #include #include #include #include #include #include #if NBPFILTER > 0 #include #endif struct ifnet **enc_ifps; /* rdomain-mapped enc ifs */ u_int enc_max_id; struct ifnet **enc_allifps; /* unit-mapped enc ifs */ u_int enc_max_unit; #define ENC_MAX_UNITS 4096 /* XXX n per rdomain */ void encattach(int); int enc_clone_create(struct if_clone *, int); int enc_clone_destroy(struct ifnet *); void enc_start(struct ifnet *); int enc_output(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); int enc_ioctl(struct ifnet *, u_long, caddr_t); int enc_setif(struct ifnet *, u_int); void enc_unsetif(struct ifnet *); struct if_clone enc_cloner = IF_CLONE_INITIALIZER("enc", enc_clone_create, enc_clone_destroy); void encattach(int count) { /* Create enc0 by default */ (void)enc_clone_create(&enc_cloner, 0); if_clone_attach(&enc_cloner); } int enc_clone_create(struct if_clone *ifc, int unit) { struct enc_softc *sc; struct ifnet *ifp; struct ifnet **new; size_t newlen; int error; if (unit > ENC_MAX_UNITS) return (EINVAL); if ((sc = malloc(sizeof(struct enc_softc), M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) return (ENOBUFS); sc->sc_unit = unit; ifp = &sc->sc_if; ifp->if_softc = sc; ifp->if_type = IFT_ENC; ifp->if_xflags = IFXF_CLONED; ifp->if_start = enc_start; ifp->if_output = enc_output; ifp->if_ioctl = enc_ioctl; ifp->if_hdrlen = ENC_HDRLEN; snprintf(ifp->if_xname, sizeof(ifp->if_xname), "%s%d", ifc->ifc_name, unit); if_attach(ifp); if (unit == 0) if_addgroup(ifp, ifc->ifc_name); /* * enc(4) does not have a link-layer address but rtrequest() * wants an ifa for every route entry. So let's setup a fake * and empty ifa of type AF_LINK for this purpose. */ if_alloc_sadl(ifp); sc->sc_ifa.ifa_ifp = ifp; sc->sc_ifa.ifa_addr = sdltosa(ifp->if_sadl); sc->sc_ifa.ifa_netmask = NULL; #if NBPFILTER > 0 bpfattach(&ifp->if_bpf, ifp, DLT_ENC, ENC_HDRLEN); #endif if ((error = enc_setif(ifp, 0)) != 0) { if_detach(ifp); free(sc, M_DEVBUF, 0); return (error); } if (unit == 0 || unit > enc_max_unit) { if ((new = mallocarray(unit + 1, sizeof(struct ifnet *), M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) return (ENOBUFS); newlen = sizeof(struct ifnet *) * (unit + 1); if (enc_allifps != NULL) { memcpy(new, enc_allifps, sizeof(struct ifnet *) * (enc_max_unit + 1)); free(enc_allifps, M_DEVBUF, 0); } enc_allifps = new; enc_max_unit = unit; } enc_allifps[unit] = ifp; return (0); } int enc_clone_destroy(struct ifnet *ifp) { struct enc_softc *sc = ifp->if_softc; int s; /* Protect users from removing enc0 */ if (sc->sc_unit == 0) return (EPERM); s = splnet(); enc_allifps[sc->sc_unit] = NULL; enc_unsetif(ifp); if_detach(ifp); free(sc, M_DEVBUF, 0); splx(s); return (0); } void enc_start(struct ifnet *ifp) { struct mbuf *m; for (;;) { IFQ_DEQUEUE(&ifp->if_snd, m); if (m == NULL) break; m_freem(m); } } int enc_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, struct rtentry *rt) { m_freem(m); /* drop packet */ return (EAFNOSUPPORT); } int enc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { struct ifreq *ifr = (struct ifreq *)data; int error; switch (cmd) { case SIOCSIFADDR: case SIOCSIFDSTADDR: case SIOCSIFFLAGS: if (ifp->if_flags & IFF_UP) ifp->if_flags |= IFF_RUNNING; else ifp->if_flags &= ~IFF_RUNNING; break; case SIOCSIFRDOMAIN: if ((error = enc_setif(ifp, ifr->ifr_rdomainid)) != 0) return (error); /* FALLTHROUGH */ default: return (ENOTTY); } return (0); } struct ifnet * enc_getif(u_int id, u_int unit) { struct ifnet *ifp; /* Check if the caller wants to get a non-default enc interface */ if (unit > 0) { if (unit > enc_max_unit) return (NULL); ifp = enc_allifps[unit]; if (ifp == NULL || ifp->if_rdomain != id) return (NULL); return (ifp); } /* Otherwise return the default enc interface for this rdomain */ if (enc_ifps == NULL) return (NULL); else if (id > RT_TABLEID_MAX) return (NULL); else if (id > enc_max_id) return (NULL); return (enc_ifps[id]); } struct ifaddr *enc_getifa(u_int id, u_int unit) { struct ifnet *ifp; struct enc_softc *sc; ifp = enc_getif(id, unit); if (ifp == NULL) return (NULL); sc = ifp->if_softc; return (&sc->sc_ifa); } int enc_setif(struct ifnet *ifp, u_int id) { struct ifnet **new; size_t newlen; enc_unsetif(ifp); /* * There can only be one default encif per rdomain - * Don't overwrite the existing enc iface that is stored * for this rdomain, so only the first enc interface that * was added for this rdomain becomes the default. */ if (enc_getif(id, 0) != NULL) return (0); if (id > RT_TABLEID_MAX) return (EINVAL); if (id == 0 || id > enc_max_id) { if ((new = mallocarray(id + 1, sizeof(struct ifnet *), M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) return (ENOBUFS); newlen = sizeof(struct ifnet *) * (id + 1); if (enc_ifps != NULL) { memcpy(new, enc_ifps, sizeof(struct ifnet *) * (enc_max_id + 1)); free(enc_ifps, M_DEVBUF, 0); } enc_ifps = new; enc_max_id = id; } enc_ifps[id] = ifp; /* Indicate that this interface is the rdomain default */ ifp->if_link_state = LINK_STATE_UP; return (0); } void enc_unsetif(struct ifnet *ifp) { u_int id = ifp->if_rdomain, i; struct ifnet *oifp, *nifp; if ((oifp = enc_getif(id, 0)) == NULL || oifp != ifp) return; /* Clear slot for this rdomain */ enc_ifps[id] = NULL; ifp->if_link_state = LINK_STATE_UNKNOWN; /* * Now find the next available encif to be the default interface * for this rdomain. */ for (i = 0; i < (enc_max_unit + 1); i++) { nifp = enc_allifps[i]; if (nifp == NULL || nifp == ifp || nifp->if_rdomain != id) continue; enc_ifps[id] = nifp; nifp->if_link_state = LINK_STATE_UP; break; } }