/* $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. * * $FreeBSD$ */ /* * if_atmsubr.c */ #include "opt_inet.h" #include "opt_inet6.h" #include "opt_natm.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/mbuf.h> #include <sys/socket.h> #include <sys/sockio.h> #include <sys/errno.h> #include <net/if.h> #include <net/netisr.h> #include <net/route.h> #include <net/if_dl.h> #include <net/if_types.h> #include <net/if_atm.h> #include <netinet/in.h> #include <netinet/if_atm.h> #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */ #if defined(INET) || defined(INET6) #include <netinet/in_var.h> #endif #ifdef NATM #include <netnatm/natm.h> #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; struct mbuf *m = m0; 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 (dst->sa_family == AF_INET6) etype = htons(ETHERTYPE_IPV6); else etype = htons(ETHERTYPE_IP); 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 */ } break; #endif /* INET || INET6 */ case AF_UNSPEC: /* * XXX: bpfwrite. 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. */ if (! IF_HANDOFF(&ifp->if_snd, m, ifp)) return (ENOBUFS); 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; 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; } } (void) IF_HANDOFF(inq, m, NULL); } /* * 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; ifp->if_snd.ifq_maxlen = 50; /* dummy */ #if defined(__NetBSD__) || defined(__OpenBSD__) TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) #elif defined(__FreeBSD__) && (__FreeBSD__ > 2) for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; ifa = TAILQ_NEXT(ifa, ifa_link)) #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; } }