/* $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck Exp $ */ /* * * Copyright (c) 1996 Charles D. Cranor and Washington University. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Charles D. Cranor and * Washington University. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR 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. */ /* * if_atmsubr.c */ #include "opt_inet.h" #include "opt_natm.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* XXX: for ETHERTYPE_* */ #if defined(INET) || defined(INET6) #include #endif #ifdef NATM #include #endif #ifndef ETHERTYPE_IPV6 #define ETHERTYPE_IPV6 0x86dd #endif #define senderr(e) { error = (e); goto bad;} /* * atm_output: ATM output routine * inputs: * "ifp" = ATM interface to output to * "m0" = the packet to output * "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI) * "rt0" = the route to use * returns: error code [0 == ok] * * note: special semantic: if (dst == NULL) then we assume "m" already * has an atm_pseudohdr on it and just send it directly. * [for native mode ATM output] if dst is null, then * rt0 must also be NULL. */ int atm_output(ifp, m0, dst, rt0) register struct ifnet *ifp; struct mbuf *m0; struct sockaddr *dst; struct rtentry *rt0; { u_int16_t etype = 0; /* if using LLC/SNAP */ int s, error = 0, sz; struct atm_pseudohdr atmdst, *ad; register struct mbuf *m = m0; register struct rtentry *rt; struct atmllc *atmllc; struct atmllc *llc_hdr = NULL; u_int32_t atm_flags; if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) senderr(ENETDOWN); /* * check route */ if ((rt = rt0) != NULL) { if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */ if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL) rt->rt_refcnt--; else senderr(EHOSTUNREACH); } if (rt->rt_flags & RTF_GATEWAY) { if (rt->rt_gwroute == 0) goto lookup; if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { rtfree(rt); rt = rt0; lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0); if ((rt = rt->rt_gwroute) == 0) senderr(EHOSTUNREACH); } } /* XXX: put RTF_REJECT code here if doing ATMARP */ } /* * check for non-native ATM traffic (dst != NULL) */ if (dst) { switch (dst->sa_family) { #if defined(INET) || defined(INET6) case AF_INET: case AF_INET6: if (!atmresolve(rt, m, dst, &atmdst)) { m = NULL; /* XXX: atmresolve already free'd it */ senderr(EHOSTUNREACH); /* XXX: put ATMARP stuff here */ /* XXX: watch who frees m on failure */ } if (dst->sa_family == AF_INET6) etype = htons(ETHERTYPE_IPV6); else etype = htons(ETHERTYPE_IP); break; #endif /* INET || INET6 */ case AF_UNSPEC: /* * XXX: bpfwrite or output from a pvc shadow if. * assuming dst contains 12 bytes (atm pseudo * header (4) + LLC/SNAP (8)) */ bcopy(dst->sa_data, &atmdst, sizeof(atmdst)); llc_hdr = (struct atmllc *)(dst->sa_data + sizeof(atmdst)); break; default: #if defined(__NetBSD__) || defined(__OpenBSD__) printf("%s: can't handle af%d\n", ifp->if_xname, dst->sa_family); #elif defined(__FreeBSD__) || defined(__bsdi__) printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, dst->sa_family); #endif senderr(EAFNOSUPPORT); } /* * must add atm_pseudohdr to data */ sz = sizeof(atmdst); atm_flags = ATM_PH_FLAGS(&atmdst); if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */ M_PREPEND(m, sz, M_DONTWAIT); if (m == 0) senderr(ENOBUFS); ad = mtod(m, struct atm_pseudohdr *); *ad = atmdst; if (atm_flags & ATM_PH_LLCSNAP) { atmllc = (struct atmllc *)(ad + 1); if (llc_hdr == NULL) { bcopy(ATMLLC_HDR, atmllc->llchdr, sizeof(atmllc->llchdr)); ATM_LLC_SETTYPE(atmllc, etype); /* note: already in network order */ } else bcopy(llc_hdr, atmllc, sizeof(struct atmllc)); } } /* * Queue message on interface, and start output if interface * not yet active. */ s = splimp(); if (IF_QFULL(&ifp->if_snd)) { IF_DROP(&ifp->if_snd); splx(s); senderr(ENOBUFS); } ifp->if_obytes += m->m_pkthdr.len; IF_ENQUEUE(&ifp->if_snd, m); if ((ifp->if_flags & IFF_OACTIVE) == 0) (*ifp->if_start)(ifp); splx(s); return (error); bad: if (m) m_freem(m); return (error); } /* * Process a received ATM packet; * the packet is in the mbuf chain m. */ void atm_input(ifp, ah, m, rxhand) struct ifnet *ifp; register struct atm_pseudohdr *ah; struct mbuf *m; void *rxhand; { register struct ifqueue *inq; u_int16_t etype = ETHERTYPE_IP; /* default */ int s; if ((ifp->if_flags & IFF_UP) == 0) { m_freem(m); return; } ifp->if_ibytes += m->m_pkthdr.len; #ifdef ATM_PVCEXT if (ATM_PH_FLAGS(ah) & ATM_PH_PVCSIF) { /* * when PVC shadow interface is used, pointer to * the shadow interface is passed as rxhand. * override the receive interface of the packet. */ m->m_pkthdr.rcvif = (struct ifnet *)rxhand; rxhand = NULL; } #endif /* ATM_PVCEXT */ if (rxhand) { #ifdef NATM struct natmpcb *npcb = rxhand; s = splimp(); /* in case 2 atm cards @ diff lvls */ npcb->npcb_inq++; /* count # in queue */ splx(s); schednetisr(NETISR_NATM); inq = &natmintrq; m->m_pkthdr.rcvif = rxhand; /* XXX: overload */ #else printf("atm_input: NATM detected but not configured in kernel\n"); m_freem(m); return; #endif } else { /* * handle LLC/SNAP header, if present */ if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) { struct atmllc *alc; if (m->m_len < sizeof(*alc) && (m = m_pullup(m, sizeof(*alc))) == 0) return; /* failed */ alc = mtod(m, struct atmllc *); if (bcmp(alc, ATMLLC_HDR, 6)) { #if defined(__NetBSD__) || defined(__OpenBSD__) printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n", ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah)); #elif defined(__FreeBSD__) || defined(__bsdi__) printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n", ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah)); #endif m_freem(m); return; } etype = ATM_LLC_TYPE(alc); m_adj(m, sizeof(*alc)); } switch (etype) { #ifdef INET case ETHERTYPE_IP: schednetisr(NETISR_IP); inq = &ipintrq; break; #endif #ifdef INET6 case ETHERTYPE_IPV6: schednetisr(NETISR_IPV6); inq = &ip6intrq; break; #endif default: m_freem(m); return; } } s = splimp(); if (IF_QFULL(inq)) { IF_DROP(inq); m_freem(m); } else IF_ENQUEUE(inq, m); splx(s); } /* * Perform common duties while attaching to interface list */ void atm_ifattach(ifp) register struct ifnet *ifp; { register struct ifaddr *ifa; register struct sockaddr_dl *sdl; ifp->if_type = IFT_ATM; ifp->if_addrlen = 0; ifp->if_hdrlen = 0; ifp->if_mtu = ATMMTU; ifp->if_output = atm_output; #if defined(__NetBSD__) || defined(__OpenBSD__) for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next) #elif defined(__FreeBSD__) && (__FreeBSD__ > 2) for (ifa = ifp->if_addrhead.tqh_first; ifa; ifa = ifa->ifa_link.tqe_next) #elif defined(__FreeBSD__) || defined(__bsdi__) for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) #endif if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && sdl->sdl_family == AF_LINK) { sdl->sdl_type = IFT_ATM; sdl->sdl_alen = ifp->if_addrlen; #ifdef notyet /* if using ATMARP, store hardware address using the next line */ bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen); #endif break; } } #ifdef ATM_PVCEXT /* * ATM PVC shadow interface: a trick to assign a shadow interface * to a PVC. * with shadow interface, each PVC looks like an individual * Point-to-Point interface. * as oposed to the NBMA model, a shadow interface is inherently * multicast capable (no LANE/MARS required). */ struct pvcsif { struct ifnet sif_shadow; /* shadow ifnet structure per pvc */ struct atm_pseudohdr sif_aph; /* flags + vpi:vci */ struct ifnet *sif_ifp; /* pointer to the genuine interface */ }; static int pvc_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *)); static int pvc_ioctl __P((struct ifnet *, u_long, caddr_t)); /* * create and attach per pvc shadow interface * (currently detach is not supported) */ static int pvc_number = 0; struct ifnet * pvc_attach(ifp) struct ifnet *ifp; { struct pvcsif *pvcsif; struct ifnet *shadow; struct ifaddr *ifa; struct sockaddr_dl *sdl; int s; MALLOC(pvcsif, struct pvcsif *, sizeof(struct pvcsif), M_DEVBUF, M_WAITOK); bzero(pvcsif, sizeof(struct pvcsif)); pvcsif->sif_ifp = ifp; shadow = &pvcsif->sif_shadow; shadow->if_name = "pvc"; shadow->if_unit = pvc_number++; shadow->if_flags = ifp->if_flags | (IFF_POINTOPOINT | IFF_MULTICAST); shadow->if_ioctl = pvc_ioctl; shadow->if_output = pvc_output; shadow->if_start = NULL; shadow->if_mtu = ifp->if_mtu; shadow->if_type = ifp->if_type; shadow->if_addrlen = ifp->if_addrlen; shadow->if_hdrlen = ifp->if_hdrlen; shadow->if_softc = pvcsif; shadow->if_snd.ifq_maxlen = 50; /* dummy */ s = splimp(); if_attach(shadow); #if defined(__NetBSD__) || defined(__OpenBSD__) for (ifa = shadow->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next) #elif defined(__FreeBSD__) && (__FreeBSD__ > 2) for (ifa = shadow->if_addrhead.tqh_first; ifa; ifa = ifa->ifa_link.tqe_next) #elif defined(__FreeBSD__) || defined(__bsdi__) for (ifa = shadow->if_addrlist; ifa; ifa = ifa->ifa_next) #endif if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && sdl->sdl_family == AF_LINK) { sdl->sdl_type = IFT_ATM; sdl->sdl_alen = shadow->if_addrlen; break; } splx(s); return (shadow); } /* * pvc_output relays the packet to atm_output along with vpi:vci info. */ static int pvc_output(shadow, m, dst, rt) struct ifnet *shadow; struct mbuf *m; struct sockaddr *dst; struct rtentry *rt; { struct pvcsif *pvcsif; struct sockaddr dst_addr; struct atmllc *atmllc; u_int16_t etype = 0; int error = 0; if ((shadow->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) senderr(ENETDOWN); pvcsif = shadow->if_softc; if (ATM_PH_VCI(&pvcsif->sif_aph) == 0) senderr(ENETDOWN); /* * create a dummy sockaddr: (using bpfwrite interface) * put atm pseudo header and llc/snap into sa_data (12 bytes) * and mark it as AF_UNSPEC. */ if (dst) { switch (dst->sa_family) { #if defined(INET) || defined(INET6) case AF_INET: case AF_INET6: if (dst->sa_family == AF_INET6) etype = htons(ETHERTYPE_IPV6); else etype = htons(ETHERTYPE_IP); break; #endif default: printf("%s%d: can't handle af%d\n", shadow->if_name, shadow->if_unit, dst->sa_family); senderr(EAFNOSUPPORT); } } dst_addr.sa_family = AF_UNSPEC; bcopy(&pvcsif->sif_aph, dst_addr.sa_data, sizeof(struct atm_pseudohdr)); atmllc = (struct atmllc *) (dst_addr.sa_data + sizeof(struct atm_pseudohdr)); bcopy(ATMLLC_HDR, atmllc->llchdr, sizeof(atmllc->llchdr)); ATM_LLC_SETTYPE(atmllc, etype); /* note: already in network order */ return atm_output(pvcsif->sif_ifp, m, &dst_addr, rt); bad: if (m) m_freem(m); return (error); } static int pvc_ioctl(shadow, cmd, data) struct ifnet *shadow; u_long cmd; caddr_t data; { struct ifnet *ifp; struct pvcsif *pvcsif; struct ifreq *ifr = (struct ifreq *) data; void (*ifa_rtrequest)(int, struct rtentry *, struct sockaddr *) = NULL; int error = 0; pvcsif = (struct pvcsif *)shadow->if_softc; ifp = pvcsif->sif_ifp; if (ifp == 0 || ifp->if_ioctl == 0) return (EOPNOTSUPP); /* * pre process */ switch (cmd) { case SIOCGPVCSIF: snprintf(ifr->ifr_name, sizeof(ifr->ifr_name), "%s%d", ifp->if_name, ifp->if_unit); return (0); case SIOCGPVCTX: do { struct pvctxreq *pvcreq = (struct pvctxreq *)data; snprintf(pvcreq->pvc_ifname, sizeof(pvcreq->pvc_ifname), "%s%d", ifp->if_name, ifp->if_unit); pvcreq->pvc_aph = pvcsif->sif_aph; } while (0); break; case SIOCADDMULTI: case SIOCDELMULTI: if (ifr == 0) return (EAFNOSUPPORT); /* XXX */ switch (ifr->ifr_addr.sa_family) { #ifdef INET case AF_INET: return (0); #endif #ifdef INET6 case AF_INET6: return (0); #endif default: return (EAFNOSUPPORT); } break; case SIOCSIFADDR: if (ifp->if_flags & IFF_UP) { /* real if is already up */ shadow->if_flags = ifp->if_flags | (IFF_POINTOPOINT|IFF_MULTICAST); return (0); } /* * XXX: save the rtrequest field since the atm driver * overwrites this field. */ ifa_rtrequest = ((struct ifaddr *)data)->ifa_rtrequest; break; case SIOCSIFFLAGS: if ((shadow->if_flags & IFF_UP) == 0) { /* * interface down. don't pass this to * the real interface. */ return (0); } if (shadow->if_flags & IFF_UP) { /* * interface up. if the real if is already up, * nothing to do. */ if (ifp->if_flags & IFF_UP) { shadow->if_flags = ifp->if_flags | (IFF_POINTOPOINT|IFF_MULTICAST); return (0); } } break; } /* * pass the ioctl to the genuine interface */ error = (*ifp->if_ioctl)(ifp, cmd, data); /* * post process */ switch (cmd) { case SIOCSIFMTU: shadow->if_mtu = ifp->if_mtu; break; case SIOCSIFADDR: /* restore rtrequest */ ((struct ifaddr *)data)->ifa_rtrequest = ifa_rtrequest; /* fall into... */ case SIOCSIFFLAGS: /* update if_flags */ shadow->if_flags = ifp->if_flags | (IFF_POINTOPOINT|IFF_MULTICAST); break; } return (error); } int pvc_setaph(shadow, aph) struct ifnet *shadow; struct atm_pseudohdr *aph; { struct pvcsif *pvcsif; pvcsif = shadow->if_softc; bcopy(aph, &pvcsif->sif_aph, sizeof(struct atm_pseudohdr)); return (0); } #endif /* ATM_PVCEXT */