/* $NetBSD: if_ethersubr.c,v 1.276.2.2 2021/10/25 18:11:02 martin 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 1.276.2.2 2021/10/25 18:11:02 martin Exp $"); #ifdef _KERNEL_OPT #include "opt_inet.h" #include "opt_atalk.h" #include "opt_mbuftrace.h" #include "opt_mpls.h" #include "opt_gateway.h" #include "opt_pppoe.h" #include "opt_net_mpsafe.h" #endif #include "vlan.h" #include "pppoe.h" #include "bridge.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 #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 #include #include #include #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 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 */ #ifdef MPLS #include #include #endif #ifdef DIAGNOSTIC static struct timeval bigpktppslim_last; static int bigpktppslim = 2; /* XXX */ static int bigpktpps_count; static kmutex_t bigpktpps_lock __cacheline_aligned; #endif 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 *, const 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 * const ifp0, struct mbuf * const m0, const struct sockaddr * const dst, const struct rtentry *rt) { uint8_t esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN]; uint16_t etype = 0; int error = 0, hdrcmplt = 0; struct mbuf *m = m0; struct mbuf *mcopy = NULL; struct ether_header *eh; struct ifnet *ifp = ifp0; #ifdef INET struct arphdr *ah; #endif #ifdef NETATALK struct at_ifaddr *aa; #endif #ifdef MBUFTRACE m_claimm(m, ifp->if_mowner); #endif #if NCARP > 0 if (ifp->if_type == IFT_CARP) { struct ifaddr *ifa; int s = pserialize_read_enter(); /* 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) { if (ifa->ifa_ifp == ifp0) { pserialize_read_exit(s); return looutput(ifp0, m, dst, rt); } } pserialize_read_exit(s); ifp = ifp->if_carpdev; /* ac = (struct arpcom *)ifp; */ if ((ifp0->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) senderr(ENETDOWN); } #endif if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) senderr(ENETDOWN); switch (dst->sa_family) { #ifdef INET case AF_INET: if (m->m_flags & M_BCAST) { memcpy(edst, etherbroadcastaddr, sizeof(edst)); } else if (m->m_flags & M_MCAST) { ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); } else { error = arpresolve(ifp, rt, m, dst, edst, sizeof(edst)); if (error) return (error == EWOULDBLOCK) ? 0 : error; } /* If broadcasting on a simplex interface, loopback a copy */ if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) mcopy = m_copypacket(m, M_DONTWAIT); etype = htons(ETHERTYPE_IP); break; case AF_ARP: ah = mtod(m, struct arphdr *); if (m->m_flags & M_BCAST) { memcpy(edst, etherbroadcastaddr, sizeof(edst)); } else { void *tha = ar_tha(ah); if (tha == NULL) { /* fake with ARPHRD_IEEE1394 */ m_freem(m); return 0; } 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 (m->m_flags & M_BCAST) { memcpy(edst, etherbroadcastaddr, sizeof(edst)); } else if (m->m_flags & M_MCAST) { ETHER_MAP_IPV6_MULTICAST(&satocsin6(dst)->sin6_addr, edst); } else { error = nd6_resolve(ifp, rt, m, dst, edst, sizeof(edst)); if (error) return (error == EWOULDBLOCK) ? 0 : error; } etype = htons(ETHERTYPE_IPV6); break; #endif #ifdef NETATALK case AF_APPLETALK: { struct ifaddr *ifa; int s; KERNEL_LOCK(1, NULL); if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { KERNEL_UNLOCK_ONE(NULL); return 0; } /* * ifaddr is the first thing in at_ifaddr */ s = pserialize_read_enter(); ifa = at_ifawithnet((const struct sockaddr_at *)dst, ifp); if (ifa == NULL) { pserialize_read_exit(s); KERNEL_UNLOCK_ONE(NULL); senderr(EADDRNOTAVAIL); } aa = (struct at_ifaddr *)ifa; /* * In the phase 2 case, we need to prepend an mbuf for the * llc header. */ if (aa->aa_flags & AFA_PHASE2) { struct llc llc; M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); if (m == NULL) { pserialize_read_exit(s); KERNEL_UNLOCK_ONE(NULL); senderr(ENOBUFS); } 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); } pserialize_read_exit(s); KERNEL_UNLOCK_ONE(NULL); break; } #endif /* NETATALK */ 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); } #ifdef MPLS { struct m_tag *mtag; mtag = m_tag_find(m, PACKET_TAG_MPLS); if (mtag != NULL) { /* Having the tag itself indicates it's MPLS */ etype = htons(ETHERTYPE_MPLS); m_tag_delete(m, mtag); } } #endif if (mcopy) (void)looutput(ifp, mcopy, dst, rt); KASSERT((m->m_flags & M_PKTHDR) != 0); /* * 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 == NULL) senderr(ENOBUFS); eh = mtod(m, struct ether_header *); /* Note: etype is already in network byte order. */ 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 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) return error; if (m == NULL) return 0; #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 #ifdef ALTQ KERNEL_LOCK(1, NULL); /* * 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); KERNEL_UNLOCK_ONE(NULL); #endif return ifq_enqueue(ifp, m); 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. * * XXX: We may need to do m_pullups here. First to ensure struct ether_header * is indeed contiguous, then to read the LLC and so on. */ void altq_etherclassify(struct ifaltq *ifq, struct mbuf *m) { struct ether_header *eh; struct mbuf *mtop = m; uint16_t ether_type; int hlen, af, hdrsize; void *hdr; KASSERT((mtop->m_flags & M_PKTHDR) != 0); 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 == NULL) goto bad; } 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)) { mtop->m_pkthdr.pattr_class = (*ifq->altq_classify)(ifq->altq_clfier, m, af); } mtop->m_pkthdr.pattr_af = af; mtop->m_pkthdr.pattr_hdr = hdr; m->m_data -= hlen; m->m_len += hlen; return; bad: mtop->m_pkthdr.pattr_class = NULL; mtop->m_pkthdr.pattr_hdr = NULL; mtop->m_pkthdr.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; pktqueue_t *pktq = NULL; struct ifqueue *inq = NULL; uint16_t etype; struct ether_header *eh; size_t ehlen; static int earlypkts; int isr = 0; #if defined (LLC) || defined(NETATALK) struct llc *l; #endif KASSERT(!cpu_intr_p()); KASSERT((m->m_flags & M_PKTHDR) != 0); if ((ifp->if_flags & IFF_UP) == 0) { m_freem(m); return; } if (m->m_len < sizeof(*eh)) { m = m_pullup(m, sizeof(*eh)); if (m == NULL) return; } #ifdef MBUFTRACE m_claimm(m, &ec->ec_rx_mowner); #endif eh = mtod(m, struct ether_header *); etype = ntohs(eh->ether_type); ehlen = sizeof(*eh); if (__predict_false(earlypkts < 100 || !rnd_initial_entropy)) { rnd_add_data(NULL, eh, ehlen, 0); earlypkts++; } /* * Determine if the packet is within its size limits. For MPLS the * header length is variable, so we skip the check. */ if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { #ifdef DIAGNOSTIC mutex_enter(&bigpktpps_lock); if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, bigpktppslim)) { printf("%s: discarding oversize frame (len=%d)\n", ifp->if_xname, m->m_pkthdr.len); } mutex_exit(&bigpktpps_lock); #endif ifp->if_iqdrops++; 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 NCARP > 0 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { /* * Clear M_PROMISC, in case the packet 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 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; } 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); } #if NAGR > 0 if (ifp->if_agrprivate && __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { m->m_flags &= ~M_PROMISC; agr_input(ifp, m); return; } #endif /* * 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 && vlan_has_tag(m)) { #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) { case ETHERTYPE_VLAN: { struct ether_vlan_header *evl = (void *)eh; /* * If there is a tag of 0, then the VLAN header was probably * just being used to store the priority. Extract the ether * type, and if IP or IPV6, let them deal with it. */ if (m->m_len >= sizeof(*evl) && EVL_VLANOFTAG(ntohs(evl->evl_tag)) == 0) { etype = ntohs(evl->evl_proto); ehlen = sizeof(*evl); if ((m->m_flags & M_PROMISC) == 0 && (etype == ETHERTYPE_IP || etype == ETHERTYPE_IPV6)) break; } #if NVLAN > 0 /* * vlan_input() will either recursively call ether_input() * or drop the packet. */ if (ec->ec_nvlans != 0) vlan_input(ifp, m); else #endif m_freem(m); return; } #if NPPPOE > 0 case ETHERTYPE_PPPOEDISC: pppoedisc_input(ifp, m); return; case ETHERTYPE_PPPOE: pppoe_input(ifp, m); return; #endif case ETHERTYPE_SLOWPROTOCOLS: { uint8_t subtype; if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { m_freem(m); return; } 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 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, ehlen); switch (etype) { #ifdef INET case ETHERTYPE_IP: #ifdef GATEWAY if (ipflow_fastforward(m)) return; #endif pktq = ip_pktq; break; case ETHERTYPE_ARP: isr = NETISR_ARP; inq = &arpintrq; break; case ETHERTYPE_REVARP: revarpinput(m); /* XXX queue? */ return; #endif #ifdef INET6 case ETHERTYPE_IPV6: if (__predict_false(!in6_present)) { m_freem(m); return; } #ifdef GATEWAY if (ip6flow_fastforward(&m)) return; #endif pktq = ip6_pktq; break; #endif #ifdef NETATALK case ETHERTYPE_ATALK: isr = NETISR_ATALK; inq = &atintrq1; break; case ETHERTYPE_AARP: aarpinput(ifp, m); /* XXX queue? */ return; #endif #ifdef MPLS case ETHERTYPE_MPLS: isr = NETISR_MPLS; inq = &mplsintrq; break; #endif default: m_freem(m); return; } } else { KASSERT(ehlen == sizeof(*eh)); #if defined (LLC) || defined (NETATALK) if (m->m_len < sizeof(*eh) + sizeof(struct llc)) { goto dropanyway; } 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)); isr = 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 queue? */ return; } default: goto dropanyway; } break; #endif dropanyway: default: m_freem(m); return; } #else /* LLC || NETATALK */ m_freem(m); return; #endif /* LLC || NETATALK */ } if (__predict_true(pktq)) { #ifdef NET_MPSAFE const u_int h = curcpu()->ci_index; #else const uint32_t h = pktq_rps_hash(m); #endif if (__predict_false(!pktq_enqueue(pktq, m, h))) { m_freem(m); } return; } if (__predict_false(!inq)) { /* Should not happen. */ m_freem(m); return; } IFQ_LOCK(inq); if (IF_QFULL(inq)) { IF_DROP(inq); IFQ_UNLOCK(inq); m_freem(m); } else { IF_ENQUEUE(inq, m); IFQ_UNLOCK(inq); schednetisr(isr); } } /* * 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 (lla != NULL) if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); LIST_INIT(&ec->ec_multiaddrs); SIMPLEQ_INIT(&ec->ec_vids); ec->ec_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); ec->ec_flags = 0; ifp->if_broadcastaddr = etherbroadcastaddr; bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); #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; IFNET_ASSERT_UNLOCKED(ifp); /* * Prevent further calls to ioctl (for example turning off * promiscuous mode from the bridge code), which eventually can * call if_init() which can cause panics because the interface * is in the process of being detached. Return device not configured * instead. */ ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio; #if NBRIDGE > 0 if (ifp->if_bridge) bridge_ifdetach(ifp); #endif bpf_detach(ifp); #if NVLAN > 0 if (ec->ec_nvlans) vlan_ifdetach(ifp); #endif ETHER_LOCK(ec); KASSERT(ec->ec_nvlans == 0); while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { LIST_REMOVE(enm, enm_list); kmem_free(enm, sizeof(*enm)); ec->ec_multicnt--; } ETHER_UNLOCK(ec); mutex_obj_free(ec->ec_lock); ec->ec_lock = NULL; ifp->if_mowner = NULL; 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_aton_r(u_char *dest, size_t len, const char *str) { const u_char *cp = (const void *)str; u_char *ep; #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) if (len < ETHER_ADDR_LEN) return ENOSPC; ep = dest + ETHER_ADDR_LEN; while (*cp) { if (!isxdigit(*cp)) return EINVAL; *dest = atox(*cp); cp++; if (isxdigit(*cp)) { *dest = (*dest << 4) | atox(*cp); cp++; } dest++; if (dest == ep) return (*cp == '\0') ? 0 : ENAMETOOLONG; switch (*cp) { case ':': case '-': case '.': cp++; break; } } return ENOBUFS; } /* * 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 #ifdef INET6 const struct sockaddr_in6 *sin6; #endif 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, *_enm; u_char addrlo[ETHER_ADDR_LEN]; u_char addrhi[ETHER_ADDR_LEN]; int error = 0; /* Allocate out of lock */ enm = kmem_alloc(sizeof(*enm), KM_SLEEP); ETHER_LOCK(ec); error = ether_multiaddr(sa, addrlo, addrhi); if (error != 0) goto out; /* * Verify that we have valid Ethernet multicast addresses. */ if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { error = EINVAL; goto out; } /* * See if the address range is already in the list. */ _enm = ether_lookup_multi(addrlo, addrhi, ec); if (_enm != NULL) { /* * Found it; just increment the reference count. */ ++_enm->enm_refcount; error = 0; goto out; } /* * Link a new multicast record into the interface's multicast list. */ memcpy(enm->enm_addrlo, addrlo, ETHER_ADDR_LEN); memcpy(enm->enm_addrhi, addrhi, ETHER_ADDR_LEN); enm->enm_refcount = 1; LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); ec->ec_multicnt++; /* * Return ENETRESET to inform the driver that the list has changed * and its reception filter should be adjusted accordingly. */ error = ENETRESET; enm = NULL; out: ETHER_UNLOCK(ec); if (enm != NULL) kmem_free(enm, sizeof(*enm)); return error; } /* * 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 error; ETHER_LOCK(ec); error = ether_multiaddr(sa, addrlo, addrhi); if (error != 0) goto error; /* * Look up the address in our list. */ enm = ether_lookup_multi(addrlo, addrhi, ec); if (enm == NULL) { error = ENXIO; goto error; } if (--enm->enm_refcount != 0) { /* * Still some claims to this record. */ error = 0; goto error; } /* * No remaining claims to this record; unlink and free it. */ LIST_REMOVE(enm, enm_list); ec->ec_multicnt--; ETHER_UNLOCK(ec); kmem_free(enm, sizeof(*enm)); /* * Return ENETRESET to inform the driver that the list has changed * and its reception filter should be adjusted accordingly. */ return ENETRESET; error: ETHER_UNLOCK(ec); return error; } void ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) { ec->ec_ifflags_cb = cb; } void ether_set_vlan_cb(struct ethercom *ec, ether_vlancb_t cb) { ec->ec_vlan_cb = cb; } static int ether_ioctl_reinit(struct ethercom *ec) { struct ifnet *ifp = &ec->ec_if; int 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); if (error == ENETRESET) { /* * Reset the interface to pick up * changes in any other flags that * affect the hardware state. */ return (*ifp->if_init)(ifp); } } else error = (*ifp->if_init)(ifp); return error; case 0: break; } return 0; } /* * 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 eccapreq *eccr; 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: { struct ifaddr *ifa = (struct ifaddr *)data; if (ifa->ifa_addr->sa_family != AF_LINK && (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 if (ifa->ifa_addr->sa_family == AF_INET) arp_ifinit(ifp, ifa); #endif 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; return ether_ioctl_reinit(ec); case SIOCGIFFLAGS: error = ifioctl_common(ifp, cmd, data); if (error == 0) { /* Set IFF_ALLMULTI for backcompat */ ifr->ifr_flags |= (ec->ec_flags & ETHER_F_ALLMULTI) ? IFF_ALLMULTI : 0; } return error; case SIOCGETHERCAP: eccr = (struct eccapreq *)data; eccr->eccr_capabilities = ec->ec_capabilities; eccr->eccr_capenable = ec->ec_capenable; return 0; case SIOCSETHERCAP: eccr = (struct eccapreq *)data; if ((eccr->eccr_capenable & ~ec->ec_capabilities) != 0) return EINVAL; if (eccr->eccr_capenable == ec->ec_capenable) return 0; #if 0 /* notyet */ ec->ec_capenable = (ec->ec_capenable & ETHERCAP_CANTCHANGE) | (eccr->eccr_capenable & ~ETHERCAP_CANTCHANGE); #else ec->ec_capenable = eccr->eccr_capenable; #endif return ether_ioctl_reinit(ec); 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 ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd); else if (ec->ec_ifmedia != NULL) return ifmedia_ioctl(ifp, ifr, ec->ec_ifmedia, cmd); else return ENOTTY; break; 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; } /* * Enable/disable passing VLAN packets if the parent interface supports it. * Return: * 0: Ok * -1: Parent interface does not support vlans * >0: Error */ int ether_enable_vlan_mtu(struct ifnet *ifp) { int error; struct ethercom *ec = (void *)ifp; /* Parent does not support VLAN's */ if ((ec->ec_capabilities & ETHERCAP_VLAN_MTU) == 0) return -1; /* * Parent supports the VLAN_MTU capability, * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames; * enable it. */ ec->ec_capenable |= ETHERCAP_VLAN_MTU; /* Interface is down, defer for later */ if ((ifp->if_flags & IFF_UP) == 0) return 0; if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) return 0; ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; return error; } int ether_disable_vlan_mtu(struct ifnet *ifp) { int error; struct ethercom *ec = (void *)ifp; /* We still have VLAN's, defer for later */ if (ec->ec_nvlans != 0) return 0; /* Parent does not support VLAB's, nothing to do. */ if ((ec->ec_capenable & ETHERCAP_VLAN_MTU) == 0) return -1; /* * Disable Tx/Rx of VLAN-sized frames. */ ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; /* Interface is down, defer for later */ if ((ifp->if_flags & IFF_UP) == 0) return 0; if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) return 0; ec->ec_capenable |= ETHERCAP_VLAN_MTU; return error; } static int ether_multicast_sysctl(SYSCTLFN_ARGS) { struct ether_multi *enm; struct ifnet *ifp; struct ethercom *ec; int error = 0; size_t written; struct psref psref; int bound; unsigned int multicnt; struct ether_multi_sysctl *addrs; int i; if (namelen != 1) return EINVAL; bound = curlwp_bind(); ifp = if_get_byindex(name[0], &psref); if (ifp == NULL) { error = ENODEV; goto out; } if (ifp->if_type != IFT_ETHER) { if_put(ifp, &psref); *oldlenp = 0; goto out; } ec = (struct ethercom *)ifp; if (oldp == NULL) { if_put(ifp, &psref); *oldlenp = ec->ec_multicnt * sizeof(*addrs); goto out; } /* * ec->ec_lock is a spin mutex so we cannot call sysctl_copyout, which * is sleepable, while holding it. Copy data to a local buffer first * with the lock taken and then call sysctl_copyout without holding it. */ retry: multicnt = ec->ec_multicnt; if (multicnt == 0) { if_put(ifp, &psref); *oldlenp = 0; goto out; } addrs = kmem_zalloc(sizeof(*addrs) * multicnt, KM_SLEEP); ETHER_LOCK(ec); if (multicnt != ec->ec_multicnt) { /* The number of multicast addresses has changed */ ETHER_UNLOCK(ec); kmem_free(addrs, sizeof(*addrs) * multicnt); goto retry; } i = 0; LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) { struct ether_multi_sysctl *addr = &addrs[i]; addr->enm_refcount = enm->enm_refcount; memcpy(addr->enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN); memcpy(addr->enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN); i++; } ETHER_UNLOCK(ec); error = 0; written = 0; for (i = 0; i < multicnt; i++) { struct ether_multi_sysctl *addr = &addrs[i]; if (written + sizeof(*addr) > *oldlenp) break; error = sysctl_copyout(l, addr, oldp, sizeof(*addr)); if (error) break; written += sizeof(*addr); oldp = (char *)oldp + sizeof(*addr); } kmem_free(addrs, sizeof(*addrs) * multicnt); if_put(ifp, &psref); *oldlenp = written; out: curlwp_bindx(bound); return error; } static void ether_sysctl_setup(struct sysctllog **clog) { const struct sysctlnode *rnode = NULL; sysctl_createv(clog, 0, NULL, &rnode, CTLFLAG_PERMANENT, CTLTYPE_NODE, "ether", SYSCTL_DESCR("Ethernet-specific information"), NULL, 0, NULL, 0, CTL_NET, CTL_CREATE, CTL_EOL); sysctl_createv(clog, 0, &rnode, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "multicast", SYSCTL_DESCR("multicast addresses"), ether_multicast_sysctl, 0, NULL, 0, CTL_CREATE, CTL_EOL); } void etherinit(void) { #ifdef DIAGNOSTIC mutex_init(&bigpktpps_lock, MUTEX_DEFAULT, IPL_NET); #endif ether_sysctl_setup(NULL); }