/* $NetBSD: if_ethersubr.c,v 1.172 2009/05/29 04:57:04 darran Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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. */ /* * 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. 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 8.2 (Berkeley) 4/4/96 */ #include __KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.172 2009/05/29 04:57:04 darran Exp $"); #include "opt_inet.h" #include "opt_atalk.h" #include "opt_iso.h" #include "opt_ipx.h" #include "opt_mbuftrace.h" #include "opt_gateway.h" #include "opt_pfil_hooks.h" #include "opt_pppoe.h" #include "vlan.h" #include "pppoe.h" #include "bridge.h" #include "bpfilter.h" #include "arp.h" #include "agr.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if NARP == 0 /* * XXX there should really be a way to issue this warning from within config(8) */ #error You have included NETATALK or a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, pppoe, vlan or options NETATALK. #endif #if NBPFILTER > 0 #include #endif #include #if NVLAN > 0 #include #endif #if NPPPOE > 0 #include #endif #if NAGR > 0 #include /* XXX */ #include #include #endif #if NBRIDGE > 0 #include #endif #include #ifdef INET #include #endif #include #ifdef INET6 #ifndef INET #include #endif #include #include #endif #include "carp.h" #if NCARP > 0 #include #endif #ifdef IPX #include #include #endif #ifdef ISO #include #include #include #include #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 */ static struct timeval bigpktppslim_last; static int bigpktppslim = 2; /* XXX */ static int bigpktpps_count; const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; #define senderr(e) { error = (e); goto bad;} static int ether_output(struct ifnet *, struct mbuf *, const struct sockaddr *, struct rtentry *); /* * Ethernet output routine. * Encapsulate a packet of type family for the local net. * Assumes that ifp is actually pointer to ethercom structure. */ static int ether_output(struct ifnet *ifp0, struct mbuf *m0, const struct sockaddr *dst, struct rtentry *rt0) { uint16_t etype = 0; int error = 0, hdrcmplt = 0; uint8_t esrc[6], edst[6]; struct mbuf *m = m0; struct rtentry *rt; struct mbuf *mcopy = NULL; struct ether_header *eh; struct ifnet *ifp = ifp0; ALTQ_DECL(struct altq_pktattr pktattr;) #ifdef INET struct arphdr *ah; #endif /* INET */ #ifdef NETATALK struct at_ifaddr *aa; #endif /* NETATALK */ #ifdef MBUFTRACE m_claimm(m, ifp->if_mowner); #endif #if NCARP > 0 if (ifp->if_type == IFT_CARP) { struct ifaddr *ifa; /* loop back if this is going to the carp interface */ if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && (ifa = ifa_ifwithaddr(dst)) != NULL && ifa->ifa_ifp == ifp0) return looutput(ifp0, m, dst, rt0); ifp = ifp->if_carpdev; /* ac = (struct arpcom *)ifp; */ if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) senderr(ENETDOWN); } #endif /* NCARP > 0 */ if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) senderr(ENETDOWN); if ((rt = rt0) != NULL) { if ((rt->rt_flags & RTF_UP) == 0) { if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { rt->rt_refcnt--; if (rt->rt_ifp != ifp) return (*rt->rt_ifp->if_output) (ifp, m0, dst, rt); } else senderr(EHOSTUNREACH); } if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { if (rt->rt_gwroute == NULL) 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) == NULL) senderr(EHOSTUNREACH); /* the "G" test below also prevents rt == rt0 */ if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_ifp != ifp)) { rt->rt_refcnt--; rt0->rt_gwroute = NULL; senderr(EHOSTUNREACH); } } } if (rt->rt_flags & RTF_REJECT) if (rt->rt_rmx.rmx_expire == 0 || (u_long) time_second < 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) (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); else if (m->m_flags & M_MCAST) ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, 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) (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); else { void *tha = ar_tha(ah); KASSERT(tha); memcpy(edst, tha, 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 INET6 case AF_INET6: if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){ /* something bad happened */ return (0); } etype = htons(ETHERTYPE_IPV6); break; #endif #ifdef NETATALK case AF_APPLETALK: if (!aarpresolve(ifp, m, (const 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( (const 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_DONTWAIT); llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; llc.llc_control = LLC_UI; memcpy(llc.llc_snap_org_code, at_org_code, sizeof(llc.llc_snap_org_code)); llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); memcpy(mtod(m, void *), &llc, sizeof(struct llc)); } else { etype = htons(ETHERTYPE_ATALK); } break; #endif /* NETATALK */ #ifdef IPX case AF_IPX: etype = htons(ETHERTYPE_IPX); memcpy(edst, &(((const struct sockaddr_ipx *)dst)->sipx_addr.x_host), sizeof(edst)); /* 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; const struct sockaddr_dl *sdl; if (rt && (sdl = satocsdl(rt->rt_gateway)) && sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { memcpy(edst, CLLADDR(sdl), sizeof(edst)); } else { error = iso_snparesolve(ifp, (const 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 *); memcpy(eh->ether_dhost, edst, sizeof(edst)); memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), sizeof(edst)); } } M_PREPEND(m, 3, M_DONTWAIT); if (m == NULL) return (0); 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 pseudo_AF_HDRCMPLT: hdrcmplt = 1; memcpy(esrc, ((const struct ether_header *)dst->sa_data)->ether_shost, sizeof(esrc)); /* FALLTHROUGH */ case AF_UNSPEC: memcpy(edst, ((const struct ether_header *)dst->sa_data)->ether_dhost, sizeof(edst)); /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ etype = ((const struct ether_header *)dst->sa_data)->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); /* If no ether type is set, this must be a 802.2 formatted packet. */ if (etype == 0) etype = htons(m->m_pkthdr.len); /* * 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 *); /* Note: etype is already in network byte order. */ (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); memcpy(eh->ether_dhost, edst, sizeof(edst)); if (hdrcmplt) memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); else memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), sizeof(eh->ether_shost)); #if NCARP > 0 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), sizeof(eh->ether_shost)); } #endif /* NCARP > 0 */ #ifdef PFIL_HOOKS if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) return (error); if (m == NULL) return (0); #endif #if NBRIDGE > 0 /* * Bridges require special output handling. */ if (ifp->if_bridge) return (bridge_output(ifp, m, NULL, NULL)); #endif #if NCARP > 0 if (ifp != ifp0) ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; #endif /* NCARP > 0 */ #ifdef ALTQ /* * If ALTQ is enabled on the parent interface, do * classification; the queueing discipline might not * require classification, but might require the * address family/header pointer in the pktattr. */ if (ALTQ_IS_ENABLED(&ifp->if_snd)) altq_etherclassify(&ifp->if_snd, m, &pktattr); #endif return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); bad: if (m) m_freem(m); return (error); } #ifdef ALTQ /* * This routine is a slight hack to allow a packet to be classified * if the Ethernet headers are present. It will go away when ALTQ's * classification engine understands link headers. */ void altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, struct altq_pktattr *pktattr) { struct ether_header *eh; uint16_t ether_type; int hlen, af, hdrsize; void *hdr; hlen = ETHER_HDR_LEN; eh = mtod(m, struct ether_header *); ether_type = htons(eh->ether_type); if (ether_type < ETHERMTU) { /* LLC/SNAP */ struct llc *llc = (struct llc *)(eh + 1); hlen += 8; if (m->m_len < hlen || llc->llc_dsap != LLC_SNAP_LSAP || llc->llc_ssap != LLC_SNAP_LSAP || llc->llc_control != LLC_UI) { /* Not SNAP. */ goto bad; } ether_type = htons(llc->llc_un.type_snap.ether_type); } switch (ether_type) { case ETHERTYPE_IP: af = AF_INET; hdrsize = 20; /* sizeof(struct ip) */ break; case ETHERTYPE_IPV6: af = AF_INET6; hdrsize = 40; /* sizeof(struct ip6_hdr) */ break; default: af = AF_UNSPEC; hdrsize = 0; break; } while (m->m_len <= hlen) { hlen -= m->m_len; m = m->m_next; } if (m->m_len < (hlen + hdrsize)) { /* * protocol header not in a single mbuf. * We can't cope with this situation right * now (but it shouldn't ever happen, really, anyhow). */ #ifdef DEBUG printf("altq_etherclassify: headers span multiple mbufs: " "%d < %d\n", m->m_len, (hlen + hdrsize)); #endif goto bad; } m->m_data += hlen; m->m_len -= hlen; hdr = mtod(m, void *); if (ALTQ_NEEDS_CLASSIFY(ifq)) pktattr->pattr_class = (*ifq->altq_classify)(ifq->altq_clfier, m, af); pktattr->pattr_af = af; pktattr->pattr_hdr = hdr; m->m_data -= hlen; m->m_len += hlen; return; bad: pktattr->pattr_class = NULL; pktattr->pattr_hdr = NULL; pktattr->pattr_af = AF_UNSPEC; } #endif /* ALTQ */ /* * Process a received Ethernet packet; * the packet is in the mbuf chain m with * the ether header. */ void ether_input(struct ifnet *ifp, struct mbuf *m) { struct ethercom *ec = (struct ethercom *) ifp; struct ifqueue *inq; uint16_t etype; struct ether_header *eh; #if defined (ISO) || defined (LLC) || defined(NETATALK) struct llc *l; #endif if ((ifp->if_flags & IFF_UP) == 0) { m_freem(m); return; } #ifdef MBUFTRACE m_claimm(m, &ec->ec_rx_mowner); #endif eh = mtod(m, struct ether_header *); etype = ntohs(eh->ether_type); /* * Determine if the packet is within its size limits. */ if (m->m_pkthdr.len > ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, bigpktppslim)) { printf("%s: discarding oversize frame (len=%d)\n", ifp->if_xname, m->m_pkthdr.len); } m_freem(m); return; } if (ETHER_IS_MULTICAST(eh->ether_dhost)) { /* * If this is not a simplex interface, drop the packet * if it came from us. */ if ((ifp->if_flags & IFF_SIMPLEX) == 0 && memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, ETHER_ADDR_LEN) == 0) { m_freem(m); return; } if (memcmp(etherbroadcastaddr, eh->ether_dhost, ETHER_ADDR_LEN) == 0) m->m_flags |= M_BCAST; else m->m_flags |= M_MCAST; ifp->if_imcasts++; } /* If the CRC is still on the packet, trim it off. */ if (m->m_flags & M_HASFCS) { m_adj(m, -ETHER_CRC_LEN); m->m_flags &= ~M_HASFCS; } ifp->if_ibytes += m->m_pkthdr.len; #if NBRIDGE > 0 /* * Tap the packet off here for a bridge. bridge_input() * will return NULL if it has consumed the packet, otherwise * it gets processed as normal. Note that bridge_input() * will always return the original packet if we need to * process it locally. */ if (ifp->if_bridge) { /* clear M_PROMISC, in case the packets comes from a vlan */ m->m_flags &= ~M_PROMISC; m = bridge_input(ifp, m); if (m == NULL) return; /* * Bridge has determined that the packet is for us. * Update our interface pointer -- we may have had * to "bridge" the packet locally. */ ifp = m->m_pkthdr.rcvif; } else #endif /* NBRIDGE > 0 */ { #if NCARP > 0 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { /* * clear M_PROMISC, in case the packets comes from a * vlan */ m->m_flags &= ~M_PROMISC; if (carp_input(m, (uint8_t *)&eh->ether_shost, (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) return; } #endif /* NCARP > 0 */ if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 && (ifp->if_flags & IFF_PROMISC) != 0 && memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, ETHER_ADDR_LEN) != 0) { m->m_flags |= M_PROMISC; } } #ifdef PFIL_HOOKS if ((m->m_flags & M_PROMISC) == 0) { if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) return; if (m == NULL) return; eh = mtod(m, struct ether_header *); etype = ntohs(eh->ether_type); } #endif #if NAGR > 0 if (ifp->if_agrprivate && __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { m->m_flags &= ~M_PROMISC; agr_input(ifp, m); return; } #endif /* NAGR > 0 */ /* * If VLANs are configured on the interface, check to * see if the device performed the decapsulation and * provided us with the tag. */ if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { #if NVLAN > 0 /* * vlan_input() will either recursively call ether_input() * or drop the packet. */ vlan_input(ifp, m); #else m_freem(m); #endif return; } /* * Handle protocols that expect to have the Ethernet header * (and possibly FCS) intact. */ switch (etype) { #if NVLAN > 0 case ETHERTYPE_VLAN: /* * vlan_input() will either recursively call ether_input() * or drop the packet. */ if (((struct ethercom *)ifp)->ec_nvlans != 0) vlan_input(ifp, m); else m_freem(m); return; #endif /* NVLAN > 0 */ #if NPPPOE > 0 case ETHERTYPE_PPPOEDISC: case ETHERTYPE_PPPOE: if (m->m_flags & M_PROMISC) { m_freem(m); return; } #ifndef PPPOE_SERVER if (m->m_flags & (M_MCAST | M_BCAST)) { m_freem(m); return; } #endif if (etype == ETHERTYPE_PPPOEDISC) inq = &ppoediscinq; else inq = &ppoeinq; if (IF_QFULL(inq)) { IF_DROP(inq); m_freem(m); } else IF_ENQUEUE(inq, m); softint_schedule(pppoe_softintr); return; #endif /* NPPPOE > 0 */ case ETHERTYPE_SLOWPROTOCOLS: { uint8_t subtype; #if defined(DIAGNOSTIC) if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { panic("ether_input: too short slow protocol packet"); } #endif m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); switch (subtype) { #if NAGR > 0 case SLOWPROTOCOLS_SUBTYPE_LACP: if (ifp->if_agrprivate) { ieee8023ad_lacp_input(ifp, m); return; } break; case SLOWPROTOCOLS_SUBTYPE_MARKER: if (ifp->if_agrprivate) { ieee8023ad_marker_input(ifp, m); return; } break; #endif /* NAGR > 0 */ default: if (subtype == 0 || subtype > 10) { /* illegal value */ m_freem(m); return; } /* unknown subtype */ break; } /* FALLTHROUGH */ } default: if (m->m_flags & M_PROMISC) { m_freem(m); return; } } /* If the CRC is still on the packet, trim it off. */ if (m->m_flags & M_HASFCS) { m_adj(m, -ETHER_CRC_LEN); m->m_flags &= ~M_HASFCS; } if (etype > ETHERMTU + sizeof (struct ether_header)) { /* Strip off the Ethernet header. */ m_adj(m, sizeof(struct ether_header)); switch (etype) { #ifdef INET case ETHERTYPE_IP: #ifdef GATEWAY if (ipflow_fastforward(m)) return; #endif 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 INET6 case ETHERTYPE_IPV6: #ifdef GATEWAY if (ip6flow_fastforward(m)) return; #endif schednetisr(NETISR_IPV6); inq = &ip6intrq; break; #endif #ifdef IPX case ETHERTYPE_IPX: schednetisr(NETISR_IPX); inq = &ipxintrq; break; #endif #ifdef NETATALK case ETHERTYPE_ATALK: 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: m_freem(m); return; } } else { #if defined (ISO) || defined (LLC) || defined (NETATALK) l = (struct llc *)(eh+1); 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 (memcmp(&(l->llc_snap_org_code)[0], at_org_code, sizeof(at_org_code)) == 0 && ntohs(l->llc_snap_ether_type) == ETHERTYPE_ATALK) { inq = &atintrq2; m_adj(m, sizeof(struct ether_header) + sizeof(struct llc)); schednetisr(NETISR_ATALK); break; } if (memcmp(&(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 ether_header) + 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) && /* XXX? case tested */ (l->llc_ssap == LLC_ISO_LSAP)) { /* LSAP for ISO */ /* XXX length computation?? */ if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) m_adj(m, etype - m->m_pkthdr.len); #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 < LLC_XID_BASIC_MINLEN + sizeof(struct ether_header)) /* XXX m_pullup? */ goto dropanyway; l->llc_window = 0; l->llc_fid = LLC_XID_FORMAT_BASIC; l->llc_class = LLC_XID_CLASS_I; l->llc_dsap = l->llc_ssap = 0; /* Fall through to */ case LLC_TEST: case LLC_TEST_P: { struct sockaddr sa; struct ether_header *eh2; int i; u_char c = l->llc_dsap; l->llc_dsap = l->llc_ssap; l->llc_ssap = c; m_adj(m, sizeof(struct ether_header)); /* XXX we can optimize here? */ if (m->m_flags & (M_BCAST | M_MCAST)) memcpy(eh->ether_dhost, CLLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 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 */ #if defined (ISO) || defined (NETATALK) dropanyway: #endif default: m_freem(m); return; } #else /* ISO || LLC || NETATALK*/ m_freem(m); return; #endif /* ISO || LLC || NETATALK*/ } if (IF_QFULL(inq)) { IF_DROP(inq); m_freem(m); } else IF_ENQUEUE(inq, m); } /* * Convert Ethernet address to printable (loggable) representation. */ char * ether_sprintf(const u_char *ap) { static char etherbuf[3 * ETHER_ADDR_LEN]; return ether_snprintf(etherbuf, sizeof(etherbuf), ap); } char * ether_snprintf(char *buf, size_t len, const u_char *ap) { char *cp = buf; size_t i; for (i = 0; i < len / 3; i++) { *cp++ = hexdigits[*ap >> 4]; *cp++ = hexdigits[*ap++ & 0xf]; *cp++ = ':'; } *--cp = '\0'; return buf; } /* * Perform common duties while attaching to interface list */ void ether_ifattach(struct ifnet *ifp, const uint8_t *lla) { struct ethercom *ec = (struct ethercom *)ifp; ifp->if_type = IFT_ETHER; ifp->if_hdrlen = ETHER_HDR_LEN; ifp->if_dlt = DLT_EN10MB; ifp->if_mtu = ETHERMTU; ifp->if_output = ether_output; ifp->if_input = ether_input; if (ifp->if_baudrate == 0) ifp->if_baudrate = IF_Mbps(10); /* just a default */ if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); LIST_INIT(&ec->ec_multiaddrs); ifp->if_broadcastaddr = etherbroadcastaddr; #if NBPFILTER > 0 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); #endif #ifdef MBUFTRACE strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, sizeof(ec->ec_tx_mowner.mo_name)); strlcpy(ec->ec_tx_mowner.mo_descr, "tx", sizeof(ec->ec_tx_mowner.mo_descr)); strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, sizeof(ec->ec_rx_mowner.mo_name)); strlcpy(ec->ec_rx_mowner.mo_descr, "rx", sizeof(ec->ec_rx_mowner.mo_descr)); MOWNER_ATTACH(&ec->ec_tx_mowner); MOWNER_ATTACH(&ec->ec_rx_mowner); ifp->if_mowner = &ec->ec_tx_mowner; #endif } void ether_ifdetach(struct ifnet *ifp) { struct ethercom *ec = (void *) ifp; struct ether_multi *enm; int s; #if NBRIDGE > 0 if (ifp->if_bridge) bridge_ifdetach(ifp); #endif #if NBPFILTER > 0 bpfdetach(ifp); #endif #if NVLAN > 0 if (ec->ec_nvlans) vlan_ifdetach(ifp); #endif s = splnet(); while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { LIST_REMOVE(enm, enm_list); free(enm, M_IFMADDR); ec->ec_multicnt--; } splx(s); #if 0 /* done in if_detach() */ if_free_sadl(ifp); #endif MOWNER_DETACH(&ec->ec_rx_mowner); MOWNER_DETACH(&ec->ec_tx_mowner); } #if 0 /* * This is for reference. We have a table-driven version * of the little-endian crc32 generator, which is faster * than the double-loop. */ uint32_t ether_crc32_le(const uint8_t *buf, size_t len) { uint32_t c, crc, carry; size_t i, j; crc = 0xffffffffU; /* initial value */ for (i = 0; i < len; i++) { c = buf[i]; for (j = 0; j < 8; j++) { carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); crc >>= 1; c >>= 1; if (carry) crc = (crc ^ ETHER_CRC_POLY_LE); } } return (crc); } #else uint32_t ether_crc32_le(const uint8_t *buf, size_t len) { static const uint32_t crctab[] = { 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c }; uint32_t crc; size_t i; crc = 0xffffffffU; /* initial value */ for (i = 0; i < len; i++) { crc ^= buf[i]; crc = (crc >> 4) ^ crctab[crc & 0xf]; crc = (crc >> 4) ^ crctab[crc & 0xf]; } return (crc); } #endif uint32_t ether_crc32_be(const uint8_t *buf, size_t len) { uint32_t c, crc, carry; size_t i, j; crc = 0xffffffffU; /* initial value */ for (i = 0; i < len; i++) { c = buf[i]; for (j = 0; j < 8; j++) { carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); crc <<= 1; c >>= 1; if (carry) crc = (crc ^ ETHER_CRC_POLY_BE) | carry; } } return (crc); } #ifdef INET const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; #endif #ifdef INET6 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; #endif /* * ether_aton implementation, not using a static buffer. */ int ether_nonstatic_aton(u_char *dest, char *str) { int i; char *cp = str; u_char val[6]; #define set_value \ if (*cp > '9' && *cp < 'a') \ *cp -= 'A' - 10; \ else if (*cp > '9') \ *cp -= 'a' - 10; \ else \ *cp -= '0' for (i = 0; i < 6; i++, cp++) { if (!isxdigit(*cp)) return (1); set_value; val[i] = *cp++; if (isxdigit(*cp)) { set_value; val[i] *= 16; val[i] += *cp++; } if (*cp == ':' || i == 5) continue; else return 1; } memcpy(dest, val, 6); return 0; } /* * Convert a sockaddr into an Ethernet address or range of Ethernet * addresses. */ int ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], uint8_t addrhi[ETHER_ADDR_LEN]) { #ifdef INET const struct sockaddr_in *sin; #endif /* INET */ #ifdef INET6 const struct sockaddr_in6 *sin6; #endif /* INET6 */ switch (sa->sa_family) { case AF_UNSPEC: memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); memcpy(addrhi, addrlo, ETHER_ADDR_LEN); break; #ifdef INET case AF_INET: sin = satocsin(sa); if (sin->sin_addr.s_addr == INADDR_ANY) { /* * An IP address of INADDR_ANY means listen to * or stop listening to all of the Ethernet * multicast addresses used for IP. * (This is for the sake of IP multicast routers.) */ memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); } else { ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); memcpy(addrhi, addrlo, ETHER_ADDR_LEN); } break; #endif #ifdef INET6 case AF_INET6: sin6 = satocsin6(sa); if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { /* * An IP6 address of 0 means listen to or stop * listening to all of the Ethernet multicast * address used for IP6. * (This is used for multicast routers.) */ memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); } else { ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); memcpy(addrhi, addrlo, ETHER_ADDR_LEN); } break; #endif default: return EAFNOSUPPORT; } return 0; } /* * Add an Ethernet multicast address or range of addresses to the list for a * given interface. */ int ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) { struct ether_multi *enm; u_char addrlo[ETHER_ADDR_LEN]; u_char addrhi[ETHER_ADDR_LEN]; int s = splnet(), error; error = ether_multiaddr(sa, addrlo, addrhi); if (error != 0) { splx(s); return error; } /* * 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; } memcpy(enm->enm_addrlo, addrlo, 6); memcpy(enm->enm_addrhi, addrhi, 6); 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(const struct sockaddr *sa, struct ethercom *ec) { struct ether_multi *enm; u_char addrlo[ETHER_ADDR_LEN]; u_char addrhi[ETHER_ADDR_LEN]; int s = splnet(), error; error = ether_multiaddr(sa, addrlo, addrhi); if (error != 0) { splx(s); return (error); } /* * Look ur 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); } void ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) { ec->ec_ifflags_cb = cb; } /* * Common ioctls for Ethernet interfaces. Note, we must be * called at splnet(). */ int ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) { struct ethercom *ec = (void *) ifp; struct ifreq *ifr = (struct ifreq *)data; struct if_laddrreq *iflr = data; const struct sockaddr_dl *sdl; static const uint8_t zero[ETHER_ADDR_LEN]; int error; switch (cmd) { case SIOCINITIFADDR: if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { ifp->if_flags |= IFF_UP; if ((error = (*ifp->if_init)(ifp)) != 0) return error; } #ifdef INET { struct ifaddr *ifa = (struct ifaddr *)data; if (ifa->ifa_addr->sa_family == AF_INET) arp_ifinit(ifp, ifa); } #endif /* INET */ return 0; case SIOCSIFMTU: { int maxmtu; if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) maxmtu = ETHERMTU_JUMBO; else maxmtu = ETHERMTU; if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) return EINVAL; else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) return error; else if (ifp->if_flags & IFF_UP) { /* Make sure the device notices the MTU change. */ return (*ifp->if_init)(ifp); } else return 0; } case SIOCSIFFLAGS: if ((error = ifioctl_common(ifp, cmd, data)) != 0) return error; switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { case IFF_RUNNING: /* * If interface is marked down and it is running, * then stop and disable it. */ (*ifp->if_stop)(ifp, 1); break; case IFF_UP: /* * If interface is marked up and it is stopped, then * start it. */ return (*ifp->if_init)(ifp); case IFF_UP|IFF_RUNNING: error = 0; if (ec->ec_ifflags_cb == NULL || (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) { /* * Reset the interface to pick up * changes in any other flags that * affect the hardware state. */ return (*ifp->if_init)(ifp); } else return error; case 0: break; } return 0; case SIOCADDMULTI: return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); case SIOCDELMULTI: return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); case SIOCSIFMEDIA: case SIOCGIFMEDIA: if (ec->ec_mii == NULL) return ENOTTY; return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd); case SIOCALIFADDR: sdl = satocsdl(sstocsa(&iflr->addr)); if (sdl->sdl_family != AF_LINK) ; else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) return EINVAL; else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) return EINVAL; /*FALLTHROUGH*/ default: return ifioctl_common(ifp, cmd, data); } return 0; }