/* $OpenBSD: if_tokensubr.c,v 1.17 2004/12/19 03:25:36 mcbride Exp $ */ /* $NetBSD: if_tokensubr.c,v 1.7 1999/05/30 00:39:07 bad Exp $ */ /* * Copyright (c) 1997-1999 * Onno van der Linden * Copyright (c) 1995 * Matt Thomas. All rights reserved. * 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. * * from: NetBSD: if_fddisubr.c,v 1.2 1995/08/19 04:35:29 cgd Exp */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #include #endif #ifdef NS #include #include #endif #ifdef DECNET #include #endif #include "bpfilter.h" #include "carp.h" #if NCARP > 0 #include #endif #ifdef LLC #include #include #endif /* * TODO: * handle source routing via send_xid() * source routing for ISO,LLC,CCITT protocols * need sockaddr_dl_8025 to handle this correctly * IPX cases * handle "fast" forwarding like if_ether and if_fddi */ #if defined(LLC) && defined(CCITT) extern struct ifqueue pkintrq; #endif #define senderr(e) { error = (e); goto bad;} #if defined(__bsdi__) || defined(__NetBSD__) || defined(__OpenBSD__) #define RTALLOC1(a, b) rtalloc1(a, b) #define ARPRESOLVE(a, b, c, d, e, f) arpresolve(a, b, c, d, e) #define TYPEHTONS(t) (t) #elif defined(__FreeBSD__) #define RTALLOC1(a, b) rtalloc1(a, b, 0UL) #define ARPRESOLVE(a, b, c, d, e, f) arpresolve(a, b, c, d, e, f) #define TYPEHTONS(t) (htons(t)) #endif #define RCF_ALLROUTES (2 << 8) | TOKEN_RCF_FRAME2 | TOKEN_RCF_BROADCAST_ALL #define RCF_SINGLEROUTE (2 << 8) | TOKEN_RCF_FRAME2 | TOKEN_RCF_BROADCAST_SINGLE #ifndef llc_snap #define llc_snap llc_un.type_snap #endif int token_output(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); /* * Token Ring output routine. * Encapsulate a packet of type family for the local net. * Assumes that ifp is actually pointer to arphdr structure. * XXX route info has to go into the same mbuf as the header */ int token_output(ifp0, m0, dst, rt0) struct ifnet *ifp0; struct mbuf *m0; struct sockaddr *dst; struct rtentry *rt0; { u_int16_t etype; int s, len, error = 0; u_char edst[ISO88025_ADDR_LEN]; struct mbuf *m = m0; struct rtentry *rt; struct mbuf *mcopy = (struct mbuf *)0; struct token_header *trh; #ifdef INET struct arpcom *ac = (struct arpcom *)ifp0; #endif /* INET */ struct token_rif *rif = (struct token_rif *)0; struct token_rif bcastrif; size_t riflen = 0; short mflags; struct ifnet *ifp = ifp0; #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)) { if ((rt->rt_flags & RTF_UP) == 0) { if ((rt0 = rt = RTALLOC1(dst, 1))) rt->rt_refcnt--; else senderr(EHOSTUNREACH); } if (rt->rt_flags & RTF_GATEWAY) { if (rt->rt_gwroute == 0) goto lookup; if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { rtfree(rt); rt = rt0; lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 1); if ((rt = rt->rt_gwroute) == 0) senderr(EHOSTUNREACH); } } if (rt->rt_flags & RTF_REJECT) if (rt->rt_rmx.rmx_expire == 0 || time_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) { if (ifp->if_flags & IFF_LINK0) { if (ifp->if_flags & IFF_LINK1) bcastrif.tr_rcf = htons(RCF_ALLROUTES); else bcastrif.tr_rcf = htons(RCF_SINGLEROUTE); rif = &bcastrif; riflen = sizeof(rif->tr_rcf); } bcopy((caddr_t)tokenbroadcastaddr, (caddr_t)edst, sizeof(edst)); } /* * XXX m->m_flags & M_MCAST IEEE802_MAP_IP_MULTICAST ?? */ else { if (!ARPRESOLVE(ac, rt, m, dst, edst, rt0)) return (0); /* if not yet resolved */ rif = TOKEN_RIF((struct llinfo_arp *) rt->rt_llinfo); riflen = (ntohs(rif->tr_rcf) & TOKEN_RCF_LEN_MASK) >> 8; } /* If broadcasting on a simplex interface, loopback a copy. */ if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && m_tag_find(m, PACKET_TAG_PF_ROUTED, NULL) == NULL) mcopy = m_copy(m, 0, (int)M_COPYALL); etype = htons(ETHERTYPE_IP); break; #if 0 case AF_ARP: /* * XXX source routing, assume m->m_data contains the useful stuff */ ah = mtod(m, struct arphdr *); ah->ar_hrd = htons(ARPHRD_IEEE802); 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); } if (m->m_flags & M_BCAST) { if (ifp->if_flags & IFF_LINK0) { if (ifp->if_flags & IFF_LINK1) bcastrif.tr_rcf = htons(RCF_ALLROUTES); else bcastrif.tr_rcf = htons(RCF_SINGLEROUTE); rif = &bcastrif; riflen = sizeof(rif->tr_rcf); } bcopy((caddr_t)tokenbroadcastaddr, (caddr_t)edst, sizeof(edst)); } else { bcopy((caddr_t)ar_tha(ah), (caddr_t)edst, sizeof(edst)); trh = (struct token_header *)M_TRHSTART(m); trh->token_ac = TOKEN_AC; trh->token_fc = TOKEN_FC; if (trh->token_shost[0] & TOKEN_RI_PRESENT) { struct token_rif *trrif; trrif = TOKEN_RIF(trh); riflen = (ntohs(trrif->tr_rcf) & TOKEN_RCF_LEN_MASK) >> 8; } bcopy((caddr_t)edst, (caddr_t)trh->token_dhost, sizeof (edst)); bcopy(LLADDR(ifp->if_sadl), (caddr_t)trh->token_shost, sizeof(trh->token_shost)); if (riflen != 0) trh->token_shost[0] |= TOKEN_RI_PRESENT; /* * compare (m->m_data - m->m_pktdat) with (sizeof(struct token_header) + riflen + ... */ m->m_len += (sizeof(*trh) + riflen + LLC_SNAPFRAMELEN); m->m_data -= (sizeof(*trh) + riflen + LLC_SNAPFRAMELEN); m->m_pkthdr.len += (sizeof(*trh) + riflen + LLC_SNAPFRAMELEN); goto send; } break; #endif /* 0 */ #endif #ifdef NS case AF_NS: etype = htons(ETHERTYPE_NS); bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), (caddr_t)edst, sizeof (edst)); if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) return (looutput(ifp, m, dst, rt)); /* If broadcasting on a simplex interface, loopback a copy. */ if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) mcopy = m_copy(m, 0, (int)M_COPYALL); break; #endif #ifdef LLC /* case AF_NSAP: */ case AF_CCITT: { 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 { /* Not a link interface ? Funny ... */ goto bad; } if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && (mcopy = m_copy(m, 0, (int)M_COPYALL))) { M_PREPEND(mcopy, sizeof (*trh), M_DONTWAIT); if (mcopy) { trh = mtod(mcopy, struct token_header *); bcopy((caddr_t)edst, (caddr_t)trh->token_dhost, sizeof (edst)); bcopy(LLADDR(ifp->if_sadl), (caddr_t)trh->token_shost, sizeof (edst)); } } etype = 0; #ifdef LLC_DEBUG { int i; struct llc *l = mtod(m, struct llc *); printf("token_output: sending LLC2 pkt to: "); for (i=0; i < ISO88025_ADDR_LEN; i++) printf("%x ", edst[i] & 0xff); printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", etype & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff, l->llc_control & 0xff); } #endif /* LLC_DEBUG */ } break; #endif /* LLC */ case AF_UNSPEC: { struct ether_header *eh; eh = (struct ether_header *)dst->sa_data; bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); if (*edst & 1) m->m_flags |= (M_BCAST|M_MCAST); etype = TYPEHTONS(eh->ether_type); if (m->m_flags & M_BCAST) { if (ifp->if_flags & IFF_LINK0) { if (ifp->if_flags & IFF_LINK1) bcastrif.tr_rcf = htons(RCF_ALLROUTES); else bcastrif.tr_rcf = htons(RCF_SINGLEROUTE); rif = &bcastrif; riflen = sizeof(bcastrif.tr_rcf); } } 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 (etype != 0) { struct llc *l; M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT); if (m == 0) senderr(ENOBUFS); l = mtod(m, struct llc *); l->llc_control = LLC_UI; l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP; l->llc_snap.org_code[0] = l->llc_snap.org_code[1] = l->llc_snap.org_code[2] = 0; bcopy((caddr_t) &etype, (caddr_t) &l->llc_snap.ether_type, sizeof(u_short)); } /* * Add local net header. If no space in first mbuf, * allocate another. */ M_PREPEND(m, (riflen + sizeof (*trh)), M_DONTWAIT); if (m == 0) senderr(ENOBUFS); trh = mtod(m, struct token_header *); trh->token_ac = TOKEN_AC; trh->token_fc = TOKEN_FC; bcopy((caddr_t)edst, (caddr_t)trh->token_dhost, sizeof (edst)); bcopy((caddr_t)ac->ac_enaddr, (caddr_t)trh->token_shost, sizeof(trh->token_shost)); if (riflen != 0) { struct token_rif *trrif; trh->token_shost[0] |= TOKEN_RI_PRESENT; trrif = TOKEN_RIF(trh); bcopy(rif, trrif, riflen); } #if 0 send: #endif /* 0 */ #if NCARP > 0 if (ifp->if_carp) { error = carp_fix_lladdr(ifp0, m, dst, NULL); if (error) goto bad; } #endif mflags = m->m_flags; len = m->m_pkthdr.len; s = splimp(); /* * Queue message on interface, and start output if interface * not yet active. */ IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error); if (error) { /* mbuf is already freed */ splx(s); return (error); } ifp->if_obytes += len; #if NCARP > 0 if (ifp != ifp0) ifp0->if_obytes += len; #endif /* NCARP > 0 */ if (mflags & M_MCAST) ifp->if_omcasts++; if ((ifp->if_flags & IFF_OACTIVE) == 0) (*ifp->if_start)(ifp); splx(s); return (error); bad: if (m) m_freem(m); return (error); } /* * Process a received token ring packet; * the packet is in the mbuf chain m with * the token ring header. */ void token_input(ifp, m) struct ifnet *ifp; struct mbuf *m; { struct ifqueue *inq; struct llc *l; struct token_header *trh; int s, lan_hdr_len; if ((ifp->if_flags & IFF_UP) == 0) { m_freem(m); return; } trh = mtod(m, struct token_header *); ifp->if_ibytes += m->m_pkthdr.len; if (bcmp((caddr_t)tokenbroadcastaddr, (caddr_t)trh->token_dhost, sizeof(tokenbroadcastaddr)) == 0) m->m_flags |= M_BCAST; else if (trh->token_dhost[0] & 1) m->m_flags |= M_MCAST; if (m->m_flags & (M_BCAST|M_MCAST)) ifp->if_imcasts++; /* Skip past the Token Ring header and RIF. */ lan_hdr_len = sizeof(struct token_header); if (trh->token_shost[0] & TOKEN_RI_PRESENT) { struct token_rif *trrif; trrif = TOKEN_RIF(trh); lan_hdr_len += (ntohs(trrif->tr_rcf) & TOKEN_RCF_LEN_MASK) >> 8; } m_adj(m, lan_hdr_len); l = mtod(m, struct llc *); switch (l->llc_dsap) { #if defined(INET) || defined(NS) || defined(DECNET) case LLC_SNAP_LSAP: { u_int16_t etype; if (l->llc_control != LLC_UI || l->llc_ssap != LLC_SNAP_LSAP) goto dropanyway; if (l->llc_snap.org_code[0] != 0 || l->llc_snap.org_code[1] != 0 || l->llc_snap.org_code[2] != 0) goto dropanyway; etype = ntohs(l->llc_snap.ether_type); m_adj(m, LLC_SNAPFRAMELEN); #if NCARP > 0 if (ifp->if_carp && ifp->if_type != IFT_CARP && (carp_input(m, (u_int8_t *)&th->token_shost, (u_int8_t *)&th->token_dhost, l->llc_snap.ether_type) == 0)) return; #endif switch (etype) { #ifdef INET case ETHERTYPE_IP: schednetisr(NETISR_IP); inq = &ipintrq; break; case ETHERTYPE_ARP: schednetisr(NETISR_ARP); inq = &arpintrq; break; #endif #ifdef NS case ETHERTYPE_NS: schednetisr(NETISR_NS); inq = &nsintrq; break; #endif #ifdef DECNET case ETHERTYPE_DECNET: schednetisr(NETISR_DECNET); inq = &decnetintrq; break; #endif default: /* printf("token_input: unknown protocol 0x%x\n", etype); */ ifp->if_noproto++; goto dropanyway; } break; } #endif /* INET || NS */ #ifdef LLC case LLC_X25_LSAP: { /* * XXX check for source routing info ? (sizeof(struct sdl_hdr) and * ISO88025_ADDR_LEN) */ M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); if (m == 0) return; if (!sdl_sethdrif(ifp, trh->token_shost, LLC_X25_LSAP, trh->token_dhost, LLC_X25_LSAP, ISO88025_ADDR_LEN, mtod(m, struct sdl_hdr *))) panic("ETHER cons addr failure"); mtod(m, struct sdl_hdr *)->sdlhdr_len = m->m_pkthdr.len - sizeof(struct sdl_hdr); #ifdef LLC_DEBUG printf("llc packet\n"); #endif /* LLC_DEBUG */ schednetisr(NETISR_CCITT); inq = &llcintrq; break; } #endif /* LLC */ default: /* printf("token_input: unknown dsap 0x%x\n", l->llc_dsap); */ ifp->if_noproto++; dropanyway: m_freem(m); return; } s = splimp(); IF_INPUT_ENQUEUE(inq, m); splx(s); } /* * Perform common duties while attaching to interface list */ void token_ifattach(ifp) struct ifnet *ifp; { ifp->if_type = IFT_ISO88025; ifp->if_addrlen = ISO88025_ADDR_LEN; ifp->if_hdrlen = 14; ifp->if_mtu = ISO88025_MTU; ifp->if_output = token_output; #ifdef IFF_NOTRAILERS ifp->if_flags |= IFF_NOTRAILERS; #endif if_alloc_sadl(ifp); bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr, LLADDR(ifp->if_sadl), ifp->if_addrlen); }