/* * $Id: ether_mod-2.4.c,v 1.1.1.1 2000/05/25 00:28:49 route Exp $ * * libnet * OpenBSD 2.4 ether_mod.c - lkm replacement for ether_output * * Copyright (c) 1998, 1999, 2000 Mike D. Schiffman * * Original code and idea 1997 Thomas Ptacek * 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. * * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. * */ #define INET #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #endif #include #ifdef NS #include #include #endif #ifdef IPX #include #include #endif #ifdef ISO #include #include #include #include #endif #include #include #include #include #include #ifdef NETATALK #include #include #include #define llc_snap_org_code llc_un.type_snap.org_code #define llc_snap_ether_type llc_un.type_snap.ether_type extern u_char at_org_code[ 3 ]; extern u_char aarp_org_code[ 3 ]; #endif /* NETATALK */ #if defined(CCITT) #include #endif #define senderr(e) { error = (e); goto bad;} int ether_output_spoof(register struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); /* * Ethernet output routine. * Encapsulate a packet of type family for the local net. * Assumes that ifp is actually pointer to arpcom structure. */ int ether_output_spoof(ifp, m0, dst, rt0) register struct ifnet *ifp; struct mbuf *m0; struct sockaddr *dst; struct rtentry *rt0; { u_int16_t etype; int s, error = 0; u_char edst[6], esrc[6]; register struct mbuf *m = m0; register struct rtentry *rt; struct mbuf *mcopy = (struct mbuf *)0; register struct ether_header *eh; struct arpcom *ac = (struct arpcom *)ifp; if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) senderr(ENETDOWN); ifp->if_lastchange = time; if ((rt = rt0) != NULL) { if ((rt->rt_flags & RTF_UP) == 0) { if ((rt0 = rt = rtalloc1(dst, 1)) != 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, 1); if ((rt = rt->rt_gwroute) == 0) senderr(EHOSTUNREACH); } } if (rt->rt_flags & RTF_REJECT) if (rt->rt_rmx.rmx_expire == 0 || time.tv_sec < rt->rt_rmx.rmx_expire) senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); } switch (dst->sa_family) { #ifdef INET case AF_INET: if (!arpresolve(ac, rt, m, dst, edst)) return (0); /* if not yet resolved */ /* If broadcasting on a simplex interface, loopback a copy */ if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) mcopy = m_copy(m, 0, (int)M_COPYALL); etype = htons(ETHERTYPE_IP); bcopy((caddr_t)ac->ac_enaddr,esrc,sizeof(esrc)); break; #endif #ifdef NS case AF_NS: etype = htons(ETHERTYPE_NS); bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), (caddr_t)edst, sizeof (edst)); if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) return (looutput(ifp, m, dst, rt)); /* If broadcasting on a simplex interface, loopback a copy */ if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) mcopy = m_copy(m, 0, (int)M_COPYALL); break; #endif #ifdef IPX case AF_IPX: etype = htons(ETHERTYPE_IPX); bcopy((caddr_t)&satosipx(dst)->sipx_addr.ipx_host, (caddr_t)edst, sizeof (edst)); if (!bcmp((caddr_t)edst, (caddr_t)&ipx_thishost, sizeof(edst))) return (looutput(ifp, m, dst, rt)); /* If broadcasting on a simplex interface, loopback a copy */ if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) mcopy = m_copy(m, 0, (int)M_COPYALL); break; #endif #ifdef NETATALK case AF_APPLETALK: { struct at_ifaddr *aa; if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) { #ifdef NETATALKDEBUG extern char *prsockaddr(struct sockaddr *); printf("aarpresolv: failed for %s\n", prsockaddr(dst)); #endif /* NETATALKDEBUG */ return (0); } /* * ifaddr is the first thing in at_ifaddr */ aa = (struct at_ifaddr *)at_ifawithnet( (struct sockaddr_at *)dst, ifp->if_addrlist.tqh_first); if (aa == 0) goto bad; /* * In the phase 2 case, we need to prepend an mbuf for the llc * header. Since we must preserve the value of m, which is * passed to us by value, we m_copy() the first mbuf, * and use it for our llc header. */ if ( aa->aa_flags & AFA_PHASE2 ) { struct llc llc; /* XXX Really this should use netisr too */ M_PREPEND(m, AT_LLC_SIZE, M_WAIT); /* * FreeBSD doesn't count the LLC len in * ifp->obytes, so they increment a length * field here. We don't do this. */ llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; llc.llc_control = LLC_UI; bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); bcopy(&llc, mtod(m, caddr_t), AT_LLC_SIZE); etype = htons(m->m_pkthdr.len); } else { etype = htons(ETHERTYPE_AT); } } break; #endif /* NETATALK */ #ifdef ISO case AF_ISO: { int snpalen; struct llc *l; register struct sockaddr_dl *sdl; if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); } else { error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, (char *)edst, &snpalen); if (error) goto bad; /* Not Resolved */ } /* If broadcasting on a simplex interface, loopback a copy */ if (*edst & 1) m->m_flags |= (M_BCAST|M_MCAST); if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && (mcopy = m_copy(m, 0, (int)M_COPYALL))) { M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); if (mcopy) { eh = mtod(mcopy, struct ether_header *); bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, sizeof (edst)); } } M_PREPEND(m, 3, M_DONTWAIT); if (m == NULL) return (0); etype = htons(m->m_pkthdr.len); l = mtod(m, struct llc *); l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; l->llc_control = LLC_UI; #ifdef ARGO_DEBUG if (argo_debug[D_ETHER]) { int i; printf("unoutput: sending pkt to: "); for (i=0; i printf("%x ", edst[i] & 0xff); printf("\n"); } #endif } break; #endif /* ISO */ /* case AF_NSAP: */ case AF_CCITT: { register struct sockaddr_dl *sdl = (struct sockaddr_dl *) rt -> rt_gateway; if (sdl && sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { bcopy(LLADDR(sdl), (char *)edst, sizeof(edst)); } else goto bad; /* Not a link interface ? Funny ... */ if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && (mcopy = m_copy(m, 0, (int)M_COPYALL))) { M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); if (mcopy) { eh = mtod(mcopy, struct ether_header *); bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, sizeof (edst)); } } etype = htons(m->m_pkthdr.len); #ifdef LLC_DEBUG { int i; register struct llc *l = mtod(m, struct llc *); printf("ether_output: sending LLC2 pkt to: "); for (i=0; i printf("%x ", edst[i] & 0xff); printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, l->llc_control & 0xff); } #endif /* LLC_DEBUG */ } break; case AF_UNSPEC: eh = (struct ether_header *)dst->sa_data; bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ etype = eh->ether_type; break; default: printf("%s: can't handle af%d\n", ifp->if_xname, dst->sa_family); senderr(EAFNOSUPPORT); } if (mcopy) (void) looutput(ifp, mcopy, dst, rt); /* * Add local net header. If no space in first mbuf, * allocate another. */ M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); if (m == 0) senderr(ENOBUFS); eh = mtod(m, struct ether_header *); bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, sizeof(eh->ether_type)); bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, sizeof (esrc)); s = splimp(); /* * Queue message on interface, and start output if interface * not yet active. */ 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 (m->m_flags & M_MCAST) ifp->if_omcasts++; if ((ifp->if_flags & IFF_OACTIVE) == 0) (*ifp->if_start)(ifp); splx(s); return (error); bad: if (m) m_freem(m); return (error); }
