/* $OpenBSD: if_arcsubr.c,v 1.22 2006/03/04 22:40:15 brad Exp $ */ /* $NetBSD: if_arcsubr.c,v 1.8 1996/05/07 02:40:29 thorpej Exp $ */ /* * 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. 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #endif #include #ifndef ARC_PHDSMTU #define ARC_PHDSMTU 1500 #endif static struct mbuf *arc_defrag(struct ifnet *, struct mbuf *); /* * RC1201 requires us to have this configurable. We have it only per * machine at the moment... there is no generic "set mtu" ioctl, AFAICS. * Anyway, it is possible to binpatch this or set it per kernel config * option. */ #if ARC_PHDSMTU > 60480 #error The arc_phdsmtu is ARC_PHDSMTU, but must not exceed 60480. #endif u_int16_t arc_phdsmtu = ARC_PHDSMTU; u_int8_t arcbroadcastaddr = 0; #define senderr(e) { error = (e); goto bad;} #define SIN(s) ((struct sockaddr_in *)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, m0, dst, rt0) struct ifnet *ifp; struct mbuf *m0; struct sockaddr *dst; struct rtentry *rt0; { struct mbuf *m, *m1, *mcopy; struct rtentry *rt; struct arccom *ac; struct arc_header *ah; int s, error, newencoding, len; u_int8_t atype, adst; int tfrags, sflag, fsflag, rsflag; if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) return (ENETDOWN); /* m, m1 aren't initialized yet */ error = newencoding = 0; ac = (struct arccom *)ifp; m = m0; mcopy = m1 = NULL; 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: /* * For now, use the simple IP addr -> ARCnet addr mapping */ if (m->m_flags & M_BCAST) adst = arcbroadcastaddr; /* ARCnet broadcast address */ else adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF; /* 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); if (ifp->if_flags & IFF_LINK0) { atype = ARCTYPE_IP; newencoding = 1; } else { atype = ARCTYPE_IP_OLD; newencoding = 0; } break; #endif case AF_UNSPEC: ah = (struct arc_header *)dst->sa_data; adst = ah->arc_dhost; atype = ah->arc_type; break; default: printf("%s: can't handle af%d\n", ifp->if_xname, dst->sa_family); senderr(EAFNOSUPPORT); } if (mcopy) (void) looutput(ifp, mcopy, dst, rt); /* * Add local net header. If no space in first mbuf, * allocate another. * * For ARCnet, this is just symbolic. The header changes * form and position on its way into the hardware and out of * the wire. At this point, it contains source, destination and * packet type. */ if (newencoding) { ++ac->ac_seqid; /* make the seqid unique */ tfrags = (m->m_pkthdr.len + 503) / 504; fsflag = 2 * tfrags - 3; sflag = 0; rsflag = fsflag; while (sflag < fsflag) { /* we CAN'T have short packets here */ m1 = m_split(m, 504, M_DONTWAIT); if (m1 == 0) senderr(ENOBUFS); M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); if (m == 0) senderr(ENOBUFS); ah = mtod(m, struct arc_header *); ah->arc_type = atype; ah->arc_dhost = adst; ah->arc_shost = ac->ac_anaddr; ah->arc_flag = rsflag; ah->arc_seqid = ac->ac_seqid; len = m->m_pkthdr.len; s = splnet(); /* * 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 ((ifp->if_flags & IFF_OACTIVE) == 0) (*ifp->if_start)(ifp); splx(s); m = m1; sflag += 2; rsflag = sflag; } m1 = NULL; M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT); if (m == 0) senderr(ENOBUFS); ah = mtod(m, struct arc_header *); ah->arc_type = atype; ah->arc_flag = sflag; ah->arc_seqid = ac->ac_seqid; /* here we can have small, especially forbidden packets */ if ((m->m_pkthdr.len >= ARC_MIN_FORBID_LEN + 2) && (m->m_pkthdr.len <= ARC_MAX_FORBID_LEN + 2)) { M_PREPEND(m, 4, M_DONTWAIT); if (m == 0) senderr(ENOBUFS); m = m_pullup(m, ARC_HDRNEWLEN); if (m == NULL) senderr(ENOBUFS); ah = mtod(m, struct arc_header *); ah->arc_type = atype; ah->arc_flag = 0xFF; ah->arc_seqid = 0xFFFF; } ah->arc_dhost = adst; ah->arc_shost = ac->ac_anaddr; } else { M_PREPEND(m, 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 = ac->ac_anaddr; } len = m->m_pkthdr.len; s = splnet(); /* * Queue message on interface, and start output if interface * not yet active. */ IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); if (error) { /* mbuf is already freed */ splx(s); return (error); } ifp->if_obytes += len; if ((ifp->if_flags & IFF_OACTIVE) == 0) (*ifp->if_start)(ifp); splx(s); return (error); bad: if (m1) m_freem(m1); if (m) m_freem(m); return (error); } /* * Defragmenter. Returns mbuf if last packet found, else * NULL. frees imcoming mbuf as necessary. */ __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; 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); m = m_pullup(m, ARC_HDRNEWLEN); if (m == NULL) { ++ifp->if_ierrors; return NULL; } ah = mtod(m, struct arc_header *); ah->arc_shost = src; ah->arc_dhost = dst; ah->arc_type = typ; } 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 (ah->arc_type != ah1->arc_type) { s = "type differs"; goto outofseq; } if (ah->arc_dhost != 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: got out of seq. packet: %s\n", ifp->if_xname, 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)); } /* * 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; int s; if ((ifp->if_flags & IFF_UP) == 0) { m_freem(m); return; } /* possibly defragment: */ m = arc_defrag(ifp, m); if (m == NULL) return; ah = mtod(m, struct arc_header *); ifp->if_ibytes += m->m_pkthdr.len; if (arcbroadcastaddr == ah->arc_dhost) { m->m_flags |= M_BCAST; ifp->if_imcasts++; } atype = ah->arc_type; switch (atype) { #ifdef INET case ARCTYPE_IP: m_adj(m, ARC_HDRNEWLEN); schednetisr(NETISR_IP); inq = &ipintrq; break; case ARCTYPE_IP_OLD: m_adj(m, ARC_HDRLEN); schednetisr(NETISR_IP); inq = &ipintrq; break; #endif default: m_freem(m); return; } s = splnet(); IF_INPUT_ENQUEUE(inq, m); splx(s); } /* * Convert Arcnet address to printable (loggable) representation. */ static char digits[] = "0123456789abcdef"; char * arc_sprintf(ap) u_int8_t *ap; { static char arcbuf[3]; char *cp = arcbuf; *cp++ = digits[*ap >> 4]; *cp++ = digits[*ap++ & 0xf]; *cp = 0; return (arcbuf); } /* * Perform common duties while attaching to interface list */ void arc_ifattach(ifp) struct ifnet *ifp; { struct arccom *ac; ifp->if_type = IFT_ARCNET; ifp->if_addrlen = 1; ifp->if_hdrlen = ARC_HDRLEN; if (ifp->if_flags & IFF_LINK0 && arc_phdsmtu > 60480) log(LOG_ERR, "%s: arc_phdsmtu is %d, but must not exceed 60480", ifp->if_xname, arc_phdsmtu); ifp->if_mtu = (ifp->if_flags & IFF_LINK0 ? arc_phdsmtu : ARCMTU); ac = (struct arccom *)ifp; ac->ac_seqid = arc4random() & 0xFFFF; /* try to make seqid unique */ if (ac->ac_anaddr == 0) { /* XXX this message isn't entirely clear, to me -- cgd */ log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n", ifp->if_xname, ifp->if_xname); } if_alloc_sadl(ifp); bcopy((caddr_t)&((struct arccom *)ifp)->ac_anaddr, LLADDR(ifp->if_sadl), ifp->if_addrlen); }