/* $OpenBSD: if_ethersubr.c,v 1.26 1998/07/07 19:26:18 ryker Exp $ */ /* $NetBSD: if_ethersubr.c,v 1.19 1996/05/07 02:40:30 thorpej 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 #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 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; #define senderr(e) { error = (e); goto bad;} int ether_ioctl(ifp, arp, cmd, data) register struct ifnet *ifp; struct arpcom *arp; u_long cmd; caddr_t data; { struct ifaddr *ifa = (struct ifaddr *)data; int error = 0; switch (cmd) { #if defined(CCITT) case SIOCSIFCONF_X25: ifp->if_flags |= IFF_UP; ifa->ifa_rtrequest = cons_rtrequest; error = x25_llcglue(PRC_IFUP, ifa->ifa_addr); break; #endif /* CCITT */ case SIOCSIFADDR: switch (ifa->ifa_addr->sa_family) { #ifdef IPX case AF_IPX: { struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr; if (ipx_nullhost(*ina)) ina->ipx_host = *(union ipx_host *)(arp->ac_enaddr); else bcopy (ina->ipx_host.c_host, arp->ac_enaddr, sizeof(arp->ac_enaddr)); break; } #endif /* IPX */ #ifdef NETATALK case AF_APPLETALK: /* Nothing to do. */ break; #endif /* NETATALK */ #ifdef NS /* XXX - This code is probably wrong. */ case AF_NS: { struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; if (ns_nullhost(*ina)) ina->x_host = *(union ns_host *)(arp->ac_enaddr); else bcopy(ina->x_host.c_host, arp->ac_enaddr, sizeof(arp->ac_enaddr)); break; } #endif /* NS */ } break; default: break; } return error; } /* * 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(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; 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); 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<6; 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<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; 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((caddr_t)ac->ac_enaddr, (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 (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); } /* * 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, llcfound = 0; register struct llc *l; #if defined(ISO) struct arpcom *ac = (struct arpcom *)ifp; #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++; decapsulate: etype = ntohs(eh->ether_type); switch (etype) { #ifdef INET case ETHERTYPE_IP: schednetisr(NETISR_IP); inq = &ipintrq; break; case ETHERTYPE_ARP: if (ifp->if_flags & IFF_NOARP) goto dropanyway; schednetisr(NETISR_ARP); inq = &arpintrq; break; case ETHERTYPE_REVARP: if (ifp->if_flags & IFF_NOARP) goto dropanyway; revarpinput(m); /* XXX queue? */ return; #endif #ifdef IPX case ETHERTYPE_IPX: schednetisr(NETISR_IPX); inq = &ipxintrq; break; #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 */ /* XXX queue this */ aarpinput((struct arpcom *)ifp, m); return; #endif default: if (llcfound || etype > ETHERMTU) goto dropanyway; llcfound = 1; l = mtod(m, struct llc *); switch (l->llc_dsap) { case LLC_SNAP_LSAP: #ifdef NETATALK /* * Some protocols (like Appletalk) need special * handling depending on if they are type II * or SNAP encapsulated. Everything else * gets handled by stripping off the SNAP header * and going back up to decapsulate. */ if (l->llc_control == LLC_UI && l->llc_ssap == LLC_SNAP_LSAP && 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, AT_LLC_SIZE); schednetisr(NETISR_ATALK); break; } if (l->llc_control == LLC_UI && l->llc_ssap == LLC_SNAP_LSAP && 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, AT_LLC_SIZE); /* XXX Really this should use netisr too */ aarpinput((struct arpcom *)ifp, m); return; } #endif /* NETATALK */ if (l->llc_control == LLC_UI && l->llc_dsap == LLC_SNAP_LSAP && l->llc_ssap == LLC_SNAP_LSAP) { /* SNAP */ if (m->m_pkthdr.len > etype) m_adj(m, etype - m->m_pkthdr.len); m->m_data += 6; /* XXX */ m->m_len -= 6; /* XXX */ m->m_pkthdr.len -= 6; /* XXX */ M_PREPEND(m, sizeof *eh, M_DONTWAIT); if (m == 0) return; *mtod(m, struct ether_header *) = *eh; goto decapsulate; } goto dropanyway; #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((caddr_t)ac->ac_enaddr, (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; } break; } #endif /* ISO */ #ifdef CCITT 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 /* CCITT */ dropanyway: default: m_freem(m); return; } } 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 int 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) register struct ifnet *ifp; { register struct ifaddr *ifa; 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; for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next) if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && sdl->sdl_family == AF_LINK) { sdl->sdl_type = IFT_ETHER; sdl->sdl_alen = ifp->if_addrlen; bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen); break; } LIST_INIT(&((struct arpcom *)ifp)->ac_multiaddrs); } 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, ac) struct ifreq *ifr; register struct arpcom *ac; { register struct ether_multi *enm; struct sockaddr_in *sin; 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, ac, 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_ac = ac; enm->enm_refcount = 1; LIST_INSERT_HEAD(&ac->ac_multiaddrs, enm, enm_list); ac->ac_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, ac) struct ifreq *ifr; register struct arpcom *ac; { register struct ether_multi *enm; struct sockaddr_in *sin; 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, ac, 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); ac->ac_multicnt--; splx(s); /* * Return ENETRESET to inform the driver that the list has changed * and its reception filter should be adjusted accordingly. */ return (ENETRESET); }