/* $NetBSD: if_ethersubr.c,v 1.26 1997/10/02 19:41:59 is Exp $ */ /* * Copyright (c) 1982, 1989, 1993 * The Regents of the University of California. 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 the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 */ #include #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 ISO #include #include #include #include #endif #ifdef LLC #include #include #endif #if defined(LLC) && defined(CCITT) extern struct ifqueue pkintrq; #endif #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 */ u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; #define senderr(e) { error = (e); goto bad;} #define SIN(x) ((struct sockaddr_in *)x) /* * Ethernet output routine. * Encapsulate a packet of type family for the local net. * Assumes that ifp is actually pointer to ethercom structure. */ int ether_output(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]; register struct mbuf *m = m0; register struct rtentry *rt; struct mbuf *mcopy = (struct mbuf *)0; register struct ether_header *eh; #ifdef INET struct arphdr *ah; #endif /* INET */ #ifdef NETATALK struct at_ifaddr *aa; #endif /* NETATALK */ 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 (m->m_flags & M_BCAST) bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, sizeof(edst)); else if (m->m_flags & M_MCAST) { ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, (caddr_t)edst) } else if (!arpresolve(ifp, 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); break; case AF_ARP: ah = mtod(m, struct arphdr *); if (m->m_flags & M_BCAST) bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, sizeof(edst)); else bcopy((caddr_t)ar_tha(ah), (caddr_t)edst, sizeof(edst)); ah->ar_hrd = htons(ARPHRD_ETHER); switch(ntohs(ah->ar_op)) { case ARPOP_REVREQUEST: case ARPOP_REVREPLY: etype = htons(ETHERTYPE_REVARP); break; case ARPOP_REQUEST: case ARPOP_REPLY: default: etype = htons(ETHERTYPE_ARP); } break; #endif #ifdef NETATALK case AF_APPLETALK: if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { #ifdef NETATALKDEBUG printf("aarpresolv failed\n"); #endif /* NETATALKDEBUG */ return (0); } /* * ifaddr is the first thing in at_ifaddr */ aa = (struct at_ifaddr *) at_ifawithnet( (struct sockaddr_at *)dst, ifp); if (aa == NULL) 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; M_PREPEND(m, sizeof(struct llc), M_WAIT); llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; llc.llc_control = LLC_UI; bcopy(at_org_code, llc.llc_snap_org_code, sizeof(llc.llc_snap_org_code)); llc.llc_snap_ether_type = htons(ETHERTYPE_AT); bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); etype = htons(m->m_pkthdr.len); } else { etype = htons(ETHERTYPE_AT); } break; #endif /* NETATALK */ #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 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(LLADDR(ifp->if_sadl), (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<6; i++) printf("%x ", edst[i] & 0xff); printf("\n"); } #endif } break; #endif /* ISO */ #ifdef LLC /* 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(LLADDR(ifp->if_sadl), (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<6; 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; #endif /* LLC */ case AF_UNSPEC: eh = (struct ether_header *)dst->sa_data; bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); /* 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(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, sizeof(eh->ether_shost)); 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 ((ifp->if_flags & IFF_OACTIVE) == 0) (*ifp->if_start)(ifp); splx(s); if (m->m_flags & M_MCAST) ifp->if_omcasts++; return (error); bad: if (m) m_freem(m); return (error); } /* * Process a received Ethernet packet; * the packet is in the mbuf chain m without * the ether header, which is provided separately. */ void ether_input(ifp, eh, m) struct ifnet *ifp; register struct ether_header *eh; struct mbuf *m; { register struct ifqueue *inq; u_int16_t etype; int s; #if defined (ISO) || defined (LLC) || defined(NETATALK) register struct llc *l; #endif if ((ifp->if_flags & IFF_UP) == 0) { m_freem(m); return; } ifp->if_lastchange = time; ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); if (eh->ether_dhost[0] & 1) { if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, sizeof(etherbroadcastaddr)) == 0) m->m_flags |= M_BCAST; else m->m_flags |= M_MCAST; } if (m->m_flags & (M_BCAST|M_MCAST)) ifp->if_imcasts++; etype = ntohs(eh->ether_type); switch (etype) { #ifdef INET case ETHERTYPE_IP: schednetisr(NETISR_IP); inq = &ipintrq; break; case ETHERTYPE_ARP: schednetisr(NETISR_ARP); inq = &arpintrq; break; case ETHERTYPE_REVARP: revarpinput(m); /* XXX queue? */ return; #endif #ifdef NS case ETHERTYPE_NS: schednetisr(NETISR_NS); inq = &nsintrq; break; #endif #ifdef NETATALK case ETHERTYPE_AT: schednetisr(NETISR_ATALK); inq = &atintrq1; break; case ETHERTYPE_AARP: /* probably this should be done with a NETISR as well */ aarpinput(ifp, m); /* XXX */ return; #endif /* NETATALK */ default: #if defined (ISO) || defined (LLC) || defined (NETATALK) if (etype > ETHERMTU) goto dropanyway; l = mtod(m, struct llc *); switch (l->llc_dsap) { #ifdef NETATALK case LLC_SNAP_LSAP: switch (l->llc_control) { case LLC_UI: if (l->llc_ssap != LLC_SNAP_LSAP) { goto dropanyway; } if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code, sizeof(at_org_code)) == 0 && ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { inq = &atintrq2; m_adj(m, sizeof(struct llc)); schednetisr(NETISR_ATALK); break; } if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, sizeof(aarp_org_code)) == 0 && ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { m_adj( m, sizeof(struct llc)); aarpinput(ifp, m); /* XXX */ return; } default: goto dropanyway; } break; #endif /* NETATALK */ #ifdef ISO case LLC_ISO_LSAP: switch (l->llc_control) { case LLC_UI: /* LLC_UI_P forbidden in class 1 service */ if ((l->llc_dsap == LLC_ISO_LSAP) && (l->llc_ssap == LLC_ISO_LSAP)) { /* LSAP for ISO */ if (m->m_pkthdr.len > etype) m_adj(m, etype - m->m_pkthdr.len); m->m_data += 3; /* XXX */ m->m_len -= 3; /* XXX */ m->m_pkthdr.len -= 3; /* XXX */ M_PREPEND(m, sizeof *eh, M_DONTWAIT); if (m == 0) return; *mtod(m, struct ether_header *) = *eh; #ifdef ARGO_DEBUG if (argo_debug[D_ETHER]) printf("clnp packet"); #endif schednetisr(NETISR_ISO); inq = &clnlintrq; break; } goto dropanyway; case LLC_XID: case LLC_XID_P: if(m->m_len < 6) goto dropanyway; l->llc_window = 0; l->llc_fid = 9; l->llc_class = 1; l->llc_dsap = l->llc_ssap = 0; /* Fall through to */ case LLC_TEST: case LLC_TEST_P: { struct sockaddr sa; register struct ether_header *eh2; int i; u_char c = l->llc_dsap; l->llc_dsap = l->llc_ssap; l->llc_ssap = c; if (m->m_flags & (M_BCAST | M_MCAST)) bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_dhost, 6); sa.sa_family = AF_UNSPEC; sa.sa_len = sizeof(sa); eh2 = (struct ether_header *)sa.sa_data; for (i = 0; i < 6; i++) { eh2->ether_shost[i] = c = eh->ether_dhost[i]; eh2->ether_dhost[i] = eh->ether_dhost[i] = eh->ether_shost[i]; eh->ether_shost[i] = c; } ifp->if_output(ifp, m, &sa, NULL); return; } default: m_freem(m); return; } break; #endif /* ISO */ #ifdef LLC case LLC_X25_LSAP: { if (m->m_pkthdr.len > etype) m_adj(m, etype - m->m_pkthdr.len); M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); if (m == 0) return; if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, eh->ether_dhost, LLC_X25_LSAP, 6, mtod(m, struct sdl_hdr *))) panic("ETHER cons addr failure"); mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; #ifdef LLC_DEBUG printf("llc packet\n"); #endif /* LLC_DEBUG */ schednetisr(NETISR_CCITT); inq = &llcintrq; break; } #endif /* LLC */ dropanyway: default: m_freem(m); return; } #else /* ISO || LLC || NETATALK*/ m_freem(m); return; #endif /* ISO || LLC || NETATALK*/ } s = splimp(); if (IF_QFULL(inq)) { IF_DROP(inq); m_freem(m); } else IF_ENQUEUE(inq, m); splx(s); } /* * Convert Ethernet address to printable (loggable) representation. */ static char digits[] = "0123456789abcdef"; char * ether_sprintf(ap) register u_char *ap; { register i; static char etherbuf[18]; register char *cp = etherbuf; for (i = 0; i < 6; i++) { *cp++ = digits[*ap >> 4]; *cp++ = digits[*ap++ & 0xf]; *cp++ = ':'; } *--cp = 0; return (etherbuf); } /* * Perform common duties while attaching to interface list */ void ether_ifattach(ifp, lla) register struct ifnet *ifp; u_int8_t * lla; { register struct sockaddr_dl *sdl; ifp->if_type = IFT_ETHER; ifp->if_addrlen = 6; ifp->if_hdrlen = 14; ifp->if_mtu = ETHERMTU; ifp->if_output = ether_output; if ((sdl = ifp->if_sadl) && sdl->sdl_family == AF_LINK) { sdl->sdl_type = IFT_ETHER; sdl->sdl_alen = ifp->if_addrlen; bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); } LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); ifp->if_broadcastaddr = etherbroadcastaddr; } u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; /* * Add an Ethernet multicast address or range of addresses to the list for a * given interface. */ int ether_addmulti(ifr, ec) struct ifreq *ifr; register struct ethercom *ec; { register struct ether_multi *enm; #ifdef INET struct sockaddr_in *sin; #endif /* INET */ u_char addrlo[6]; u_char addrhi[6]; int s = splimp(); switch (ifr->ifr_addr.sa_family) { case AF_UNSPEC: bcopy(ifr->ifr_addr.sa_data, addrlo, 6); bcopy(addrlo, addrhi, 6); break; #ifdef INET case AF_INET: sin = (struct sockaddr_in *)&(ifr->ifr_addr); if (sin->sin_addr.s_addr == INADDR_ANY) { /* * An IP address of INADDR_ANY means listen to all * of the Ethernet multicast addresses used for IP. * (This is for the sake of IP multicast routers.) */ bcopy(ether_ipmulticast_min, addrlo, 6); bcopy(ether_ipmulticast_max, addrhi, 6); } else { ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); bcopy(addrlo, addrhi, 6); } break; #endif default: splx(s); return (EAFNOSUPPORT); } /* * Verify that we have valid Ethernet multicast addresses. */ if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { splx(s); return (EINVAL); } /* * See if the address range is already in the list. */ ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); if (enm != NULL) { /* * Found it; just increment the reference count. */ ++enm->enm_refcount; splx(s); return (0); } /* * New address or range; malloc a new multicast record * and link it into the interface's multicast list. */ enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); if (enm == NULL) { splx(s); return (ENOBUFS); } bcopy(addrlo, enm->enm_addrlo, 6); bcopy(addrhi, enm->enm_addrhi, 6); enm->enm_ec = ec; enm->enm_refcount = 1; LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); ec->ec_multicnt++; splx(s); /* * Return ENETRESET to inform the driver that the list has changed * and its reception filter should be adjusted accordingly. */ return (ENETRESET); } /* * Delete a multicast address record. */ int ether_delmulti(ifr, ec) struct ifreq *ifr; register struct ethercom *ec; { register struct ether_multi *enm; #ifdef INET struct sockaddr_in *sin; #endif /* INET */ u_char addrlo[6]; u_char addrhi[6]; int s = splimp(); switch (ifr->ifr_addr.sa_family) { case AF_UNSPEC: bcopy(ifr->ifr_addr.sa_data, addrlo, 6); bcopy(addrlo, addrhi, 6); break; #ifdef INET case AF_INET: sin = (struct sockaddr_in *)&(ifr->ifr_addr); if (sin->sin_addr.s_addr == INADDR_ANY) { /* * An IP address of INADDR_ANY means stop listening * to the range of Ethernet multicast addresses used * for IP. */ bcopy(ether_ipmulticast_min, addrlo, 6); bcopy(ether_ipmulticast_max, addrhi, 6); } else { ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); bcopy(addrlo, addrhi, 6); } break; #endif default: splx(s); return (EAFNOSUPPORT); } /* * Look up the address in our list. */ ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); if (enm == NULL) { splx(s); return (ENXIO); } if (--enm->enm_refcount != 0) { /* * Still some claims to this record. */ splx(s); return (0); } /* * No remaining claims to this record; unlink and free it. */ LIST_REMOVE(enm, enm_list); free(enm, M_IFMADDR); ec->ec_multicnt--; splx(s); /* * Return ENETRESET to inform the driver that the list has changed * and its reception filter should be adjusted accordingly. */ return (ENETRESET); }