/* * 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 * $FreeBSD$ */ #include "opt_atalk.h" #include "opt_inet.h" #include "opt_ipx.h" #include "opt_bdg.h" #include "opt_netgraph.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #endif #ifdef IPX #include #include #endif #ifdef NS #include #include ushort ns_nettype; int ether_outputdebug = 0; int ether_inputdebug = 0; #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 */ #ifdef BRIDGE #include #endif #include "vlan.h" #if NVLAN > 0 #include #endif /* NVLAN > 0 */ static int ether_resolvemulti __P((struct ifnet *, struct sockaddr **, struct sockaddr *)); u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; #define senderr(e) do { error = (e); goto bad;} while (0) #define IFP2AC(IFP) ((struct arpcom *)IFP) #ifdef NETGRAPH #include #include #include static void ngether_init(void* ignored); static void ngether_send(struct arpcom *ac, struct ether_header *eh, struct mbuf *m); static ng_constructor_t ngether_constructor; static ng_rcvmsg_t ngether_rcvmsg; static ng_shutdown_t ngether_rmnode; static ng_newhook_t ngether_newhook; static ng_connect_t ngether_connect; static ng_rcvdata_t ngether_rcvdata; static ng_disconnect_t ngether_disconnect; static struct ng_type typestruct = { NG_VERSION, NG_ETHER_NODE_TYPE, NULL, ngether_constructor, ngether_rcvmsg, ngether_rmnode, ngether_newhook, NULL, ngether_connect, ngether_rcvdata, ngether_rcvdata, ngether_disconnect }; #define AC2NG(AC) ((node_p)((AC)->ac_ng)) #define NGEF_DIVERT NGF_TYPE1 /* all packets sent to netgraph */ #endif /* NETGRAPH */ /* * Ethernet output routine. * Encapsulate a packet of type family for the local net. * Use trailer local net encapsulation if enough data in first * packet leaves a multiple of 512 bytes of data in remainder. * 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; { short type; int s, error = 0, hdrcmplt = 0; u_char esrc[6], edst[6]; register struct mbuf *m = m0; register struct rtentry *rt; register struct ether_header *eh; int off, len = m->m_pkthdr.len, loop_copy = 0; int hlen; /* link layer header lenght */ struct arpcom *ac = IFP2AC(ifp); if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) senderr(ENETDOWN); rt = rt0; if (rt) { if ((rt->rt_flags & RTF_UP) == 0) { rt0 = rt = rtalloc1(dst, 1, 0UL); if (rt0) 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, 0UL); if ((rt = rt->rt_gwroute) == 0) senderr(EHOSTUNREACH); } } if (rt->rt_flags & RTF_REJECT) if (rt->rt_rmx.rmx_expire == 0 || time_second < rt->rt_rmx.rmx_expire) senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); } hlen = ETHER_HDR_LEN; switch (dst->sa_family) { #ifdef INET case AF_INET: if (!arpresolve(ac, rt, m, dst, edst, rt0)) return (0); /* if not yet resolved */ off = m->m_pkthdr.len - m->m_len; type = htons(ETHERTYPE_IP); break; #endif #ifdef IPX case AF_IPX: type = htons(ETHERTYPE_IPX); bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), (caddr_t)edst, sizeof (edst)); break; #endif #ifdef NETATALK case AF_APPLETALK: { struct at_ifaddr *aa; if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { goto bad; } if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) return (0); /* * In the phase 2 case, 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); len += sizeof(struct llc); 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), sizeof(struct llc)); type = htons(m->m_pkthdr.len); hlen = sizeof(struct llc) + ETHER_HDR_LEN; } else { type = htons(ETHERTYPE_AT); } break; } #endif NETATALK #ifdef NS case AF_NS: switch(ns_nettype){ default: case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ type = 0x8137; break; case 0x0: /* Novell 802.3 */ type = htons( m->m_pkthdr.len); break; case 0xe0e0: /* Novell 802.2 and Token-Ring */ M_PREPEND(m, 3, M_WAIT); type = htons( m->m_pkthdr.len); cp = mtod(m, u_char *); *cp++ = 0xE0; *cp++ = 0xE0; *cp++ = 0x03; break; } bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), (caddr_t)edst, sizeof (edst)); /* * XXX if ns_thishost is the same as the node's ethernet * address then just the default code will catch this anyhow. * So I'm not sure if this next clause should be here at all? * [JRE] */ if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){ m->m_pkthdr.rcvif = ifp; schednetisr(NETISR_NS); inq = &nsintrq; s = splimp(); if (IF_QFULL(inq)) { IF_DROP(inq); m_freem(m); } else IF_ENQUEUE(inq, m); splx(s); return (error); } if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){ m->m_flags |= M_BCAST; } break; #endif /* NS */ #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 if (error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, (char *)edst, &snpalen)) goto bad; /* Not Resolved */ /* If broadcasting on a simplex interface, loopback a copy */ if (*edst & 1) m->m_flags |= (M_BCAST|M_MCAST); M_PREPEND(m, 3, M_DONTWAIT); if (m == NULL) return (0); type = htons(m->m_pkthdr.len); l = mtod(m, struct llc *); l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; l->llc_control = LLC_UI; len += 3; IFDEBUG(D_ETHER) int i; printf("unoutput: sending pkt to: "); for (i=0; i<6; i++) printf("%x ", edst[i] & 0xff); printf("\n"); ENDDEBUG } 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 (*edst & 1) loop_copy = 1; type = 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", type & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff, l->llc_control & 0xff); } #endif /* LLC_DEBUG */ } break; #endif /* LLC */ case pseudo_AF_HDRCMPLT: hdrcmplt = 1; eh = (struct ether_header *)dst->sa_data; (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); /* FALLTHROUGH */ case AF_UNSPEC: loop_copy = -1; /* if this is for us, don't do it */ eh = (struct ether_header *)dst->sa_data; (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); type = eh->ether_type; break; default: printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, dst->sa_family); senderr(EAFNOSUPPORT); } /* * 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 *); (void)memcpy(&eh->ether_type, &type, sizeof(eh->ether_type)); (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); if (hdrcmplt) (void)memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); else (void)memcpy(eh->ether_shost, ac->ac_enaddr, sizeof(eh->ether_shost)); /* * If a simplex interface, and the packet is being sent to our * Ethernet address or a broadcast address, loopback a copy. * XXX To make a simplex device behave exactly like a duplex * device, we should copy in the case of sending to our own * ethernet address (thus letting the original actually appear * on the wire). However, we don't do that here for security * reasons and compatibility with the original behavior. */ if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); (void) if_simloop(ifp, n, dst, hlen); } else if (bcmp(eh->ether_dhost, eh->ether_shost, ETHER_ADDR_LEN) == 0) { (void) if_simloop(ifp, m, dst, hlen); return (0); /* XXX */ } } #ifdef BRIDGE if (do_bridge) { struct mbuf *m0 = m ; if (m->m_pkthdr.rcvif) m->m_pkthdr.rcvif = NULL ; ifp = bridge_dst_lookup(m); bdg_forward(&m0, ifp); if (m0) m_freem(m0); return (0); } #endif 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); } IF_ENQUEUE(&ifp->if_snd, m); if ((ifp->if_flags & IFF_OACTIVE) == 0) (*ifp->if_start)(ifp); splx(s); ifp->if_obytes += len + sizeof (struct ether_header); 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_short ether_type; 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_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++; ether_type = ntohs(eh->ether_type); #ifdef NETGRAPH { struct arpcom *ac = IFP2AC(ifp); if (AC2NG(ac) && (AC2NG(ac)->flags & NGEF_DIVERT)) { ngether_send(ac, eh, m); return; } } #endif /* NETGRAPH */ #if NVLAN > 0 if (ether_type == vlan_proto) { if (vlan_input(eh, m) < 0) ifp->if_data.ifi_noproto++; return; } #endif /* NVLAN > 0 */ switch (ether_type) { #ifdef INET case ETHERTYPE_IP: if (ipflow_fastforward(m)) return; schednetisr(NETISR_IP); inq = &ipintrq; break; case ETHERTYPE_ARP: schednetisr(NETISR_ARP); inq = &arpintrq; break; #endif #ifdef IPX case ETHERTYPE_IPX: schednetisr(NETISR_IPX); inq = &ipxintrq; break; #endif #ifdef NS case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ schednetisr(NETISR_NS); inq = &nsintrq; break; #endif /* NS */ #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(IFP2AC(ifp), m); /* XXX */ return; #endif NETATALK default: #ifdef NS checksum = mtod(m, ushort *); /* Novell 802.3 */ if ((ether_type <= ETHERMTU) && ((*checksum == 0xffff) || (*checksum == 0xE0E0))){ if(*checksum == 0xE0E0) { m->m_pkthdr.len -= 3; m->m_len -= 3; m->m_data += 3; } schednetisr(NETISR_NS); inq = &nsintrq; break; } #endif /* NS */ #if defined (ISO) || defined (LLC) || defined(NETATALK) if (ether_type > 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(IFP2AC(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 > ether_type) m_adj(m, ether_type - 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; IFDEBUG(D_ETHER) printf("clnp packet"); ENDDEBUG 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; } default: m_freem(m); return; } break; #endif /* ISO */ #ifdef LLC case LLC_X25_LSAP: { if (m->m_pkthdr.len > ether_type) m_adj(m, ether_type - 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 = ether_type; #ifdef LLC_DEBUG printf("llc packet\n"); #endif /* LLC_DEBUG */ schednetisr(NETISR_CCITT); inq = &llcintrq; break; } #endif /* LLC */ dropanyway: default: #ifdef NETGRAPH ngether_send(IFP2AC(ifp), eh, m); #else /* NETGRAPH */ m_freem(m); #endif /* NETGRAPH */ return; } #else /* ISO || LLC || NETATALK */ #ifdef NETGRAPH ngether_send(IFP2AC(ifp), eh, m); #else /* NETGRAPH */ m_freem(m); #endif /* NETGRAPH */ return; #endif /* ISO || LLC || NETATALK */ } s = splimp(); if (IF_QFULL(inq)) { IF_DROP(inq); m_freem(m); } else IF_ENQUEUE(inq, m); splx(s); } /* * 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_resolvemulti = ether_resolvemulti; if (ifp->if_baudrate == 0) ifp->if_baudrate = 10000000; ifa = ifnet_addrs[ifp->if_index - 1]; if (ifa == 0) { printf("ether_ifattach: no lladdr!\n"); return; } sdl = (struct sockaddr_dl *)ifa->ifa_addr; sdl->sdl_type = IFT_ETHER; sdl->sdl_alen = ifp->if_addrlen; bcopy((IFP2AC(ifp))->ac_enaddr, LLADDR(sdl), ifp->if_addrlen); #ifdef NETGRAPH ngether_init(ifp); #endif /* NETGRAPH */ } SYSCTL_DECL(_net_link); SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); int ether_ioctl(ifp, command, data) struct ifnet *ifp; int command; caddr_t data; { struct ifaddr *ifa = (struct ifaddr *) data; struct ifreq *ifr = (struct ifreq *) data; int error = 0; switch (command) { case SIOCSIFADDR: ifp->if_flags |= IFF_UP; switch (ifa->ifa_addr->sa_family) { #ifdef INET case AF_INET: ifp->if_init(ifp->if_softc); /* before arpwhohas */ arp_ifinit(IFP2AC(ifp), ifa); break; #endif #ifdef IPX /* * XXX - This code is probably wrong */ case AF_IPX: { register struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); struct arpcom *ac = IFP2AC(ifp); if (ipx_nullhost(*ina)) ina->x_host = *(union ipx_host *) ac->ac_enaddr; else { bcopy((caddr_t) ina->x_host.c_host, (caddr_t) ac->ac_enaddr, sizeof(ac->ac_enaddr)); } /* * Set new address */ ifp->if_init(ifp->if_softc); break; } #endif #ifdef NS /* * XXX - This code is probably wrong */ case AF_NS: { register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); struct arpcom *ac = IFP2AC(ifp); if (ns_nullhost(*ina)) ina->x_host = *(union ns_host *) (ac->ac_enaddr); else { bcopy((caddr_t) ina->x_host.c_host, (caddr_t) ac->ac_enaddr, sizeof(ac->ac_enaddr)); } /* * Set new address */ ifp->if_init(ifp->if_softc); break; } #endif default: ifp->if_init(ifp->if_softc); break; } break; case SIOCGIFADDR: { struct sockaddr *sa; sa = (struct sockaddr *) & ifr->ifr_data; bcopy(IFP2AC(ifp)->ac_enaddr, (caddr_t) sa->sa_data, ETHER_ADDR_LEN); } break; case SIOCSIFMTU: /* * Set the interface MTU. */ if (ifr->ifr_mtu > ETHERMTU) { error = EINVAL; } else { ifp->if_mtu = ifr->ifr_mtu; } break; } return (error); } int ether_resolvemulti(ifp, llsa, sa) struct ifnet *ifp; struct sockaddr **llsa; struct sockaddr *sa; { struct sockaddr_dl *sdl; struct sockaddr_in *sin; u_char *e_addr; switch(sa->sa_family) { case AF_LINK: /* * No mapping needed. Just check that it's a valid MC address. */ sdl = (struct sockaddr_dl *)sa; e_addr = LLADDR(sdl); if ((e_addr[0] & 1) != 1) return EADDRNOTAVAIL; *llsa = 0; return 0; #ifdef INET case AF_INET: sin = (struct sockaddr_in *)sa; if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) return EADDRNOTAVAIL; MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, M_WAITOK); sdl->sdl_len = sizeof *sdl; sdl->sdl_family = AF_LINK; sdl->sdl_index = ifp->if_index; sdl->sdl_type = IFT_ETHER; sdl->sdl_nlen = 0; sdl->sdl_alen = ETHER_ADDR_LEN; sdl->sdl_slen = 0; e_addr = LLADDR(sdl); ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); *llsa = (struct sockaddr *)sdl; return 0; #endif default: /* * Well, the text isn't quite right, but it's the name * that counts... */ return EAFNOSUPPORT; } } #ifdef NETGRAPH /*********************************************************************** * This section contains the methods for the Netgraph interface ***********************************************************************/ /* It's Ascii-art time! * The ifnet is the first part of the arpcom which must be * the first part of the device's softc.. yuk. * * +--------------------------+-----+---------+ * | struct ifnet (*ifp) | | | * | | | | * +--------------------------+ | | * +--|[ac_ng] struct arpcom (*ac) | | * | +--------------------------------+ | * | | struct softc (*ifp->if_softc) (device) | * | +------------------------------------------+ * | ^ * AC2NG() | * | v * | +----------------------+ * | | [private] [flags] | * +------>| struct ng_node | * | [hooks] | ** we only allow one hook * +----------------------+ * ^ * | * v * +-------------+ * | [node] | * | hook | * | [private]|-- *unused* * +-------------+ */ /* * called during interface attaching */ static void ngether_init(void *ifpvoid) { struct ifnet *ifp = ifpvoid; struct arpcom *ac = IFP2AC(ifp); static int ngether_done_init; char namebuf[32]; node_p node; /* * we have found a node, make sure our 'type' is availabe. */ if (ngether_done_init == 0) { if (ng_newtype(&typestruct)) { printf("ngether install failed\n"); return; } ngether_done_init = 1; } if (ng_make_node_common(&typestruct, &node) != 0) return; ac->ac_ng = node; node->private = ifp; sprintf(namebuf, "%s%d", ifp->if_name, ifp->if_unit); ng_name_node(AC2NG(ac), namebuf); } /* * It is not possible or allowable to create a node of this type. * If the hardware exists, it will already have created it. */ static int ngether_constructor(node_p *nodep) { return (EINVAL); } /* * Give our ok for a hook to be added... * * Allow one hook at a time (rawdata). * It can eiteh rdivert everything or only unclaimed packets. */ static int ngether_newhook(node_p node, hook_p hook, const char *name) { /* check if there is already a hook */ if (LIST_FIRST(&(node->hooks))) return(EISCONN); /* * Check for which mode hook we want. */ if (strcmp(name, NG_ETHER_HOOK_ORPHAN) != 0) { if (strcmp(name, NG_ETHER_HOOK_DIVERT) != 0) { return (EINVAL); } node->flags |= NGEF_DIVERT; } else { node->flags &= ~NGEF_DIVERT; } return (0); } /* * incoming messages. * Just respond to the generic TEXT_STATUS message */ static int ngether_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, struct ng_mesg **resp) { struct ifnet *ifp; int error = 0; ifp = node->private; switch (msg->header.typecookie) { case NGM_ETHER_COOKIE: error = EINVAL; break; case NGM_GENERIC_COOKIE: switch(msg->header.cmd) { case NGM_TEXT_STATUS: { char *arg; int pos = 0; int resplen = sizeof(struct ng_mesg) + 512; MALLOC(*resp, struct ng_mesg *, resplen, M_NETGRAPH, M_NOWAIT); if (*resp == NULL) { error = ENOMEM; break; } bzero(*resp, resplen); arg = (*resp)->data; /* * Put in the throughput information. */ pos = sprintf(arg, "%ld bytes in, %ld bytes out\n", ifp->if_ibytes, ifp->if_obytes); pos += sprintf(arg + pos, "%ld output errors\n", ifp->if_oerrors); pos += sprintf(arg + pos, "ierrors = %ld\n", ifp->if_ierrors); (*resp)->header.version = NG_VERSION; (*resp)->header.arglen = strlen(arg) + 1; (*resp)->header.token = msg->header.token; (*resp)->header.typecookie = NGM_ETHER_COOKIE; (*resp)->header.cmd = msg->header.cmd; strncpy((*resp)->header.cmdstr, "status", NG_CMDSTRLEN); } break; default: error = EINVAL; break; } break; default: error = EINVAL; break; } free(msg, M_NETGRAPH); return (error); } /* * Receive a completed ethernet packet. * Queue it for output. */ static int ngether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) { struct ifnet *ifp; int error = 0; int s; struct ether_header *eh; ifp = hook->node->private; if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) senderr(ENETDOWN); /* drop in the MAC address */ eh = mtod(m, struct ether_header *); bcopy(IFP2AC(ifp)->ac_enaddr, eh->ether_shost, 6); /* * If a simplex interface, and the packet is being sent to our * Ethernet address or a broadcast address, loopback a copy. * XXX To make a simplex device behave exactly like a duplex * device, we should copy in the case of sending to our own * ethernet address (thus letting the original actually appear * on the wire). However, we don't do that here for security * reasons and compatibility with the original behavior. */ if (ifp->if_flags & IFF_SIMPLEX) { if (m->m_flags & M_BCAST) { struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); ng_queue_data(hook, n, meta); } else if (bcmp(eh->ether_dhost, eh->ether_shost, ETHER_ADDR_LEN) == 0) { ng_queue_data(hook, m, meta); return (0); /* XXX */ } } s = splimp(); /* * Queue message on interface, and start output if interface * not yet active. * XXX if we lookead at the priority in the meta data we could * queue high priority items at the head. */ if (IF_QFULL(&ifp->if_snd)) { IF_DROP(&ifp->if_snd); splx(s); senderr(ENOBUFS); } IF_ENQUEUE(&ifp->if_snd, m); if ((ifp->if_flags & IFF_OACTIVE) == 0) (*ifp->if_start)(ifp); splx(s); ifp->if_obytes += m->m_pkthdr.len; if (m->m_flags & M_MCAST) ifp->if_omcasts++; return (error); bad: NG_FREE_DATA(m, meta); return (error); } /* * pass an mbuf out to the connected hook * More complicated than just an m_prepend, as it tries to save later nodes * from needing to do lots of m_pullups. */ static void ngether_send(struct arpcom *ac, struct ether_header *eh, struct mbuf *m) { int room; node_p node = AC2NG(ac); struct ether_header *eh2; if (node && LIST_FIRST(&(node->hooks))) { /* * Possibly the header is already on the front, */ eh2 = mtod(m, struct ether_header *) - 1; if ( eh == eh2) { /* * This is the case so just move the markers back to * re-include it. We lucked out. * This allows us to avoid a yucky m_pullup * in later nodes if it works. */ m->m_len += sizeof(*eh); m->m_data -= sizeof(*eh); m->m_pkthdr.len += sizeof(*eh); } else { /* * Alternatively there may be room even though * it is stored somewhere else. If so, copy it in. * This only safe because we KNOW that this packet has * just been generated by an ethernet card, so there * are no aliases to the buffer. (unlike in outgoing * packets). * Nearly all ethernet cards will end up producing mbufs * that fall into these cases. So we are not optimising * contorted cases. */ if (m->m_flags & M_EXT) { room = (mtod(m, caddr_t) - m->m_ext.ext_buf); if (room > m->m_ext.ext_size) /* garbage */ room = 0; /* fail immediatly */ } else { room = (mtod(m, caddr_t) - m->m_pktdat); } if (room > sizeof (*eh)) { /* we have room, just copy it and adjust */ m->m_len += sizeof(*eh); m->m_data -= sizeof(*eh); m->m_pkthdr.len += sizeof(*eh); } else { /* * Doing anything more is likely to get more * expensive than it's worth.. * it's probable that everything else is in one * big lump. The next node will do an m_pullup() * for exactly the amount of data it needs and * hopefully everything after that will not * need one. So let's just use m_prepend. */ m = m_prepend(m, sizeof(*eh), M_DONTWAIT); if (m == NULL) return; } bcopy ((caddr_t)eh, mtod(m, struct ether_header *), sizeof(*eh)); } ng_queue_data(LIST_FIRST(&(node->hooks)), m, NULL); } else { m_freem(m); } } /* * do local shutdown processing.. * This node will refuse to go away, unless the hardware says to.. * don't unref the node, or remove our name. just clear our links up. */ static int ngether_rmnode(node_p node) { ng_cutlinks(node); node->flags &= ~NG_INVALID; /* bounce back to life */ return (0); } /* already linked */ static int ngether_connect(hook_p hook) { /* be really amiable and just say "YUP that's OK by me! " */ return (0); } /* * notify on hook disconnection (destruction) * * For this type, removal of the last lins no effect. The interface can run * independently. * Since we have no per-hook information, this is rather simple. */ static int ngether_disconnect(hook_p hook) { hook->node->flags &= ~NGEF_DIVERT; return (0); } #endif /* NETGRAPH */ /********************************** END *************************************/