/* $NetBSD: if_arcsubr.c,v 1.36 2001/06/14 05:44:23 itojun Exp $ */ /* $FreeBSD$ */ /* * Copyright (c) 1994, 1995 Ignatios Souvatzis * 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. * * from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 * */ #include "opt_inet.h" #include "opt_inet6.h" #include "opt_ipx.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(INET) || defined(INET6) #include #include #include #endif #ifdef INET6 #include #endif #ifdef IPX #include #include #endif MODULE_VERSION(arcnet, 1); #define ARCNET_ALLOW_BROKEN_ARP static struct mbuf *arc_defrag(struct ifnet *, struct mbuf *); static int arc_resolvemulti(struct ifnet *, struct sockaddr **, struct sockaddr *); u_int8_t arcbroadcastaddr = 0; #define ARC_LLADDR(ifp) (*(u_int8_t *)IF_LLADDR(ifp)) #define senderr(e) { error = (e); goto bad;} #define SIN(s) ((struct sockaddr_in *)s) #define SIPX(s) ((struct sockaddr_ipx *)s) /* * ARCnet output routine. * Encapsulate a packet of type family for the local net. * Assumes that ifp is actually pointer to arccom structure. */ int arc_output(ifp, m, dst, rt0) struct ifnet *ifp; struct mbuf *m; struct sockaddr *dst; struct rtentry *rt0; { struct rtentry *rt; struct arccom *ac; struct arc_header *ah; int error; u_int8_t atype, adst; int loop_copy = 0; int isphds; if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) return(ENETDOWN); /* m, m1 aren't initialized yet */ error = 0; ac = (struct arccom *)ifp; if ((rt = rt0)) { if ((rt->rt_flags & RTF_UP) == 0) { if ((rt0 = rt = rtalloc1(dst, 1, 0UL))) 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); } switch (dst->sa_family) { #ifdef INET case AF_INET: /* * For now, use the simple IP addr -> ARCnet addr mapping */ if (m->m_flags & (M_BCAST|M_MCAST)) adst = arcbroadcastaddr; /* ARCnet broadcast address */ else if (ifp->if_flags & IFF_NOARP) adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF; else if (!arpresolve(ifp, rt, m, dst, &adst, rt0)) return 0; /* not resolved yet */ atype = (ifp->if_flags & IFF_LINK0) ? ARCTYPE_IP_OLD : ARCTYPE_IP; break; #endif #ifdef INET6 case AF_INET6: #ifdef OLDIP6OUTPUT if (!nd6_resolve(ifp, rt, m, dst, (u_char *)&adst)) return(0); /* if not yet resolves */ #else if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)&adst)) return(0); /* it must be impossible, but... */ #endif /* OLDIP6OUTPUT */ atype = ARCTYPE_INET6; break; #endif #ifdef IPX case AF_IPX: adst = SIPX(dst)->sipx_addr.x_host.c_host[5]; atype = ARCTYPE_IPX; if (adst == 0xff) adst = arcbroadcastaddr; break; #endif case AF_UNSPEC: loop_copy = -1; ah = (struct arc_header *)dst->sa_data; adst = ah->arc_dhost; atype = ah->arc_type; if (atype == ARCTYPE_ARP) { atype = (ifp->if_flags & IFF_LINK0) ? ARCTYPE_ARP_OLD: ARCTYPE_ARP; #ifdef ARCNET_ALLOW_BROKEN_ARP /* * XXX It's not clear per RFC826 if this is needed, but * "assigned numbers" say this is wrong. * However, e.g., AmiTCP 3.0Beta used it... we make this * switchable for emergency cases. Not perfect, but... */ if (ifp->if_flags & IFF_LINK2) mtod(m, struct arphdr *)->ar_pro = atype - 1; #endif } break; default: if_printf(ifp, "can't handle af%d\n", dst->sa_family); senderr(EAFNOSUPPORT); } isphds = arc_isphds(atype); M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, M_DONTWAIT); if (m == 0) senderr(ENOBUFS); ah = mtod(m, struct arc_header *); ah->arc_type = atype; ah->arc_dhost = adst; ah->arc_shost = ARC_LLADDR(ifp); if (isphds) { ah->arc_flag = 0; ah->arc_seqid = 0; } 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->sa_family, ARC_HDRLEN); } else if (ah->arc_dhost == ah->arc_shost) { (void) if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN); return (0); /* XXX */ } } BPF_MTAP(ifp, m); if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) { m = 0; senderr(ENOBUFS); } return (error); bad: if (m) m_freem(m); return (error); } void arc_frag_init(ifp) struct ifnet *ifp; { struct arccom *ac; ac = (struct arccom *)ifp; ac->curr_frag = 0; } struct mbuf * arc_frag_next(ifp) struct ifnet *ifp; { struct arccom *ac; struct mbuf *m; struct arc_header *ah; ac = (struct arccom *)ifp; if ((m = ac->curr_frag) == 0) { int tfrags; /* dequeue new packet */ IF_DEQUEUE(&ifp->if_snd, m); if (m == 0) return 0; ah = mtod(m, struct arc_header *); if (!arc_isphds(ah->arc_type)) return m; ++ac->ac_seqid; /* make the seqid unique */ tfrags = (m->m_pkthdr.len + ARC_MAX_DATA - 1) / ARC_MAX_DATA; ac->fsflag = 2 * tfrags - 3; ac->sflag = 0; ac->rsflag = ac->fsflag; ac->arc_dhost = ah->arc_dhost; ac->arc_shost = ah->arc_shost; ac->arc_type = ah->arc_type; m_adj(m, ARC_HDRNEWLEN); ac->curr_frag = m; } /* split out next fragment and return it */ if (ac->sflag < ac->fsflag) { /* we CAN'T have short packets here */ ac->curr_frag = m_split(m, ARC_MAX_DATA, M_DONTWAIT); if (ac->curr_frag == 0) { m_freem(m); return 0; } M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); if (m == 0) { m_freem(ac->curr_frag); ac->curr_frag = 0; return 0; } ah = mtod(m, struct arc_header *); ah->arc_flag = ac->rsflag; ah->arc_seqid = ac->ac_seqid; ac->sflag += 2; ac->rsflag = ac->sflag; } else if ((m->m_pkthdr.len >= ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) && (m->m_pkthdr.len <= ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) { ac->curr_frag = 0; M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT); if (m == 0) return 0; ah = mtod(m, struct arc_header *); ah->arc_flag = 0xFF; ah->arc_seqid = 0xFFFF; ah->arc_type2 = ac->arc_type; ah->arc_flag2 = ac->sflag; ah->arc_seqid2 = ac->ac_seqid; } else { ac->curr_frag = 0; M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); if (m == 0) return 0; ah = mtod(m, struct arc_header *); ah->arc_flag = ac->sflag; ah->arc_seqid = ac->ac_seqid; } ah->arc_dhost = ac->arc_dhost; ah->arc_shost = ac->arc_shost; ah->arc_type = ac->arc_type; return m; } /* * Defragmenter. Returns mbuf if last packet found, else * NULL. frees imcoming mbuf as necessary. */ static __inline struct mbuf * arc_defrag(ifp, m) struct ifnet *ifp; struct mbuf *m; { struct arc_header *ah, *ah1; struct arccom *ac; struct ac_frag *af; struct mbuf *m1; char *s; int newflen; u_char src,dst,typ; ac = (struct arccom *)ifp; if (m->m_len < ARC_HDRNEWLEN) { m = m_pullup(m, ARC_HDRNEWLEN); if (m == NULL) { ++ifp->if_ierrors; return NULL; } } ah = mtod(m, struct arc_header *); typ = ah->arc_type; if (!arc_isphds(typ)) return m; src = ah->arc_shost; dst = ah->arc_dhost; if (ah->arc_flag == 0xff) { m_adj(m, 4); if (m->m_len < ARC_HDRNEWLEN) { m = m_pullup(m, ARC_HDRNEWLEN); if (m == NULL) { ++ifp->if_ierrors; return NULL; } } ah = mtod(m, struct arc_header *); } af = &ac->ac_fragtab[src]; m1 = af->af_packet; s = "debug code error"; if (ah->arc_flag & 1) { /* * first fragment. We always initialize, which is * about the right thing to do, as we only want to * accept one fragmented packet per src at a time. */ if (m1 != NULL) m_freem(m1); af->af_packet = m; m1 = m; af->af_maxflag = ah->arc_flag; af->af_lastseen = 0; af->af_seqid = ah->arc_seqid; return NULL; /* notreached */ } else { /* check for unfragmented packet */ if (ah->arc_flag == 0) return m; /* do we have a first packet from that src? */ if (m1 == NULL) { s = "no first frag"; goto outofseq; } ah1 = mtod(m1, struct arc_header *); if (ah->arc_seqid != ah1->arc_seqid) { s = "seqid differs"; goto outofseq; } if (typ != ah1->arc_type) { s = "type differs"; goto outofseq; } if (dst != ah1->arc_dhost) { s = "dest host differs"; goto outofseq; } /* typ, seqid and dst are ok here. */ if (ah->arc_flag == af->af_lastseen) { m_freem(m); return NULL; } if (ah->arc_flag == af->af_lastseen + 2) { /* ok, this is next fragment */ af->af_lastseen = ah->arc_flag; m_adj(m,ARC_HDRNEWLEN); /* * m_cat might free the first mbuf (with pkthdr) * in 2nd chain; therefore: */ newflen = m->m_pkthdr.len; m_cat(m1,m); m1->m_pkthdr.len += newflen; /* is it the last one? */ if (af->af_lastseen > af->af_maxflag) { af->af_packet = NULL; return(m1); } else return NULL; } s = "other reason"; /* if all else fails, it is out of sequence, too */ } outofseq: if (m1) { m_freem(m1); af->af_packet = NULL; } if (m) m_freem(m); log(LOG_INFO,"%s%d: got out of seq. packet: %s\n", ifp->if_name, ifp->if_unit, s); return NULL; } /* * return 1 if Packet Header Definition Standard, else 0. * For now: old IP, old ARP aren't obviously. Lacking correct information, * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS. * (Apple and Novell corporations were involved, among others, in PHDS work). * Easiest is to assume that everybody else uses that, too. */ int arc_isphds(type) u_int8_t type; { return (type != ARCTYPE_IP_OLD && type != ARCTYPE_ARP_OLD && type != ARCTYPE_DIAGNOSE); } /* * Process a received Arcnet packet; * the packet is in the mbuf chain m with * the ARCnet header. */ void arc_input(ifp, m) struct ifnet *ifp; struct mbuf *m; { struct arc_header *ah; struct ifqueue *inq; u_int8_t atype; if ((ifp->if_flags & IFF_UP) == 0) { m_freem(m); return; } /* possibly defragment: */ m = arc_defrag(ifp, m); if (m == NULL) return; BPF_MTAP(ifp, m); ah = mtod(m, struct arc_header *); /* does this belong to us? */ if ((ifp->if_flags & IFF_PROMISC) == 0 && ah->arc_dhost != arcbroadcastaddr && ah->arc_dhost != ARC_LLADDR(ifp)) { m_freem(m); return; } ifp->if_ibytes += m->m_pkthdr.len; if (ah->arc_dhost == arcbroadcastaddr) { m->m_flags |= M_BCAST|M_MCAST; ifp->if_imcasts++; } atype = ah->arc_type; switch (atype) { #ifdef INET case ARCTYPE_IP: m_adj(m, ARC_HDRNEWLEN); if (ipflow_fastforward(m)) return; schednetisr(NETISR_IP); inq = &ipintrq; break; case ARCTYPE_IP_OLD: m_adj(m, ARC_HDRLEN); if (ipflow_fastforward(m)) return; schednetisr(NETISR_IP); inq = &ipintrq; break; case ARCTYPE_ARP: if (ifp->if_flags & IFF_NOARP) { /* Discard packet if ARP is disabled on interface */ m_freem(m); return; } m_adj(m, ARC_HDRNEWLEN); schednetisr(NETISR_ARP); inq = &arpintrq; #ifdef ARCNET_ALLOW_BROKEN_ARP mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); #endif break; case ARCTYPE_ARP_OLD: if (ifp->if_flags & IFF_NOARP) { /* Discard packet if ARP is disabled on interface */ m_freem(m); return; } m_adj(m, ARC_HDRLEN); schednetisr(NETISR_ARP); inq = &arpintrq; #ifdef ARCNET_ALLOW_BROKEN_ARP mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP); #endif break; #endif #ifdef INET6 case ARCTYPE_INET6: m_adj(m, ARC_HDRNEWLEN); schednetisr(NETISR_IPV6); inq = &ip6intrq; break; #endif #ifdef IPX case ARCTYPE_IPX: m_adj(m, ARC_HDRNEWLEN); schednetisr(NETISR_IPX); inq = &ipxintrq; break; #endif default: m_freem(m); return; } IF_HANDOFF(inq, m, NULL); } /* * Register (new) link level address. */ void arc_storelladdr(ifp, lla) struct ifnet *ifp; u_int8_t lla; { ARC_LLADDR(ifp) = lla; } /* * Perform common duties while attaching to interface list */ void arc_ifattach(ifp, lla) struct ifnet *ifp; u_int8_t lla; { struct ifaddr *ifa; struct sockaddr_dl *sdl; struct arccom *ac; if_attach(ifp); ifp->if_type = IFT_ARCNET; ifp->if_addrlen = 1; ifp->if_hdrlen = ARC_HDRLEN; ifp->if_mtu = 1500; ifp->if_resolvemulti = arc_resolvemulti; if (ifp->if_baudrate == 0) ifp->if_baudrate = 2500000; #if __FreeBSD_version < 500000 ifa = ifnet_addrs[ifp->if_index - 1]; #else ifa = ifaddr_byindex(ifp->if_index); #endif KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__)); sdl = (struct sockaddr_dl *)ifa->ifa_addr; sdl->sdl_type = IFT_ARCNET; sdl->sdl_alen = ifp->if_addrlen; if (ifp->if_flags & IFF_BROADCAST) ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI; ac = (struct arccom *)ifp; ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */ if (lla == 0) { /* XXX this message isn't entirely clear, to me -- cgd */ log(LOG_ERR,"%s%d: link address 0 reserved for broadcasts. Please change it and ifconfig %s%d down up\n", ifp->if_name, ifp->if_unit, ifp->if_name, ifp->if_unit); } arc_storelladdr(ifp, lla); ifp->if_broadcastaddr = &arcbroadcastaddr; bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN); } void arc_ifdetach(ifp) struct ifnet *ifp; { bpfdetach(ifp); if_detach(ifp); } int arc_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(ifp, ifa); break; #endif #ifdef IPX /* * XXX This code is probably wrong */ case AF_IPX: { struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); if (ipx_nullhost(*ina)) ina->x_host.c_host[5] = ARC_LLADDR(ifp); else arc_storelladdr(ifp, ina->x_host.c_host[5]); /* * 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; *(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp); } break; case SIOCADDMULTI: case SIOCDELMULTI: if (ifr == NULL) error = EAFNOSUPPORT; else { switch (ifr->ifr_addr.sa_family) { case AF_INET: case AF_INET6: error = 0; break; default: error = EAFNOSUPPORT; break; } } break; case SIOCSIFMTU: /* * Set the interface MTU. * mtu can't be larger than ARCMTU for RFC1051 * and can't be larger than ARC_PHDS_MTU */ if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) || ifr->ifr_mtu > ARC_PHDS_MAXMTU) error = EINVAL; else ifp->if_mtu = ifr->ifr_mtu; break; } return (error); } /* based on ether_resolvemulti() */ int arc_resolvemulti(ifp, llsa, sa) struct ifnet *ifp; struct sockaddr **llsa; struct sockaddr *sa; { struct sockaddr_dl *sdl; struct sockaddr_in *sin; #ifdef INET6 struct sockaddr_in6 *sin6; #endif switch(sa->sa_family) { case AF_LINK: /* * No mapping needed. Just check that it's a valid MC address. */ sdl = (struct sockaddr_dl *)sa; if (*LLADDR(sdl) != arcbroadcastaddr) 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_ZERO); sdl->sdl_len = sizeof *sdl; sdl->sdl_family = AF_LINK; sdl->sdl_index = ifp->if_index; sdl->sdl_type = IFT_ARCNET; sdl->sdl_alen = ARC_ADDR_LEN; *LLADDR(sdl) = 0; *llsa = (struct sockaddr *)sdl; return 0; #endif #ifdef INET6 case AF_INET6: sin6 = (struct sockaddr_in6 *)sa; if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { /* * An IP6 address of 0 means listen to all * of the Ethernet multicast address used for IP6. * (This is used for multicast routers.) */ ifp->if_flags |= IFF_ALLMULTI; *llsa = 0; return 0; } if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) return EADDRNOTAVAIL; MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, M_ZERO); sdl->sdl_len = sizeof *sdl; sdl->sdl_family = AF_LINK; sdl->sdl_index = ifp->if_index; sdl->sdl_type = IFT_ARCNET; sdl->sdl_alen = ARC_ADDR_LEN; *LLADDR(sdl) = 0; *llsa = (struct sockaddr *)sdl; return 0; #endif default: /* * Well, the text isn't quite right, but it's the name * that counts... */ return EAFNOSUPPORT; } }