/* $NetBSD: if_hippisubr.c,v 1.5 2000/03/30 09:45:35 augustss Exp $ */ /* * 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. */ #include "opt_inet.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #endif #define senderr(e) { error = (e); goto bad;} #define SIN(x) ((struct sockaddr_in *)x) #define SDL(x) ((struct sockaddr_dl *)x) #ifndef llc_snap #define llc_snap llc_un.type_snap #endif static int hippi_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *)); static void hippi_input __P((struct ifnet *, struct mbuf *)); /* * HIPPI output routine. * Encapsulate a packet of type family for the local net. * I don't know anything about the mapping of AppleTalk or OSI * protocols to HIPPI, so I don't include any code for them. */ static int hippi_output(ifp, m0, dst, rt0) struct ifnet *ifp; struct mbuf *m0; struct sockaddr *dst; struct rtentry *rt0; { u_int16_t htype; u_int32_t ifield = 0; int s, error = 0; struct mbuf *m = m0; struct rtentry *rt; struct hippi_header *hh; u_int32_t *cci; u_int32_t d2_len; if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) senderr(ENETDOWN); ifp->if_lastchange = time; /* HIPPI doesn't really do broadcast or multicast right now */ if (m->m_flags & (M_BCAST | M_MCAST)) senderr(EOPNOTSUPP); /* XXX: some other error? */ if ((rt = rt0) != NULL) { if ((rt->rt_flags & RTF_UP) == 0) { if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { rt->rt_refcnt--; if (rt->rt_ifp != ifp) return (*rt->rt_ifp->if_output) (ifp, m0, dst, rt); } else senderr(EHOSTUNREACH); } if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 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); /* the "G" test below also prevents rt == rt0 */ if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_ifp != ifp)) { rt->rt_refcnt--; rt0->rt_gwroute = 0; senderr(EHOSTUNREACH); } } } if (rt->rt_flags & RTF_REJECT) if (rt->rt_rmx.rmx_expire == 0 || /* XXX: no ARP */ time.tv_sec < rt->rt_rmx.rmx_expire) senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); } switch (dst->sa_family) { #ifdef INET #ifdef INET6 case AF_INET6: #endif case AF_INET: if (rt) { struct sockaddr_dl *sdl = (struct sockaddr_dl *) SDL(rt->rt_gateway); if (sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) bcopy(LLADDR(sdl), &ifield, sizeof(ifield)); } if (!ifield) /* XXX: bogus check, but helps us get going */ senderr(EHOSTUNREACH); htype = htons(ETHERTYPE_IP); break; #endif default: printf("%s: can't handle af%d\n", ifp->if_xname, dst->sa_family); senderr(EAFNOSUPPORT); } if (htype != 0) { struct llc *l; M_PREPEND(m, sizeof (struct llc), 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) &htype, (caddr_t) &l->llc_snap.ether_type, sizeof(u_int16_t)); } d2_len = m->m_pkthdr.len; /* * Add local net header. If no space in first mbuf, * allocate another. */ M_PREPEND(m, sizeof (struct hippi_header) + 8, M_DONTWAIT); if (m == 0) senderr(ENOBUFS); cci = mtod(m, u_int32_t *); bzero(cci, sizeof(struct hippi_header) + 8); cci[0] = 0; cci[1] = ifield; hh = (struct hippi_header *) &cci[2]; hh->hi_fp.fp_ulp = HIPPI_ULP_802; hh->hi_fp.fp_flags = HIPPI_FP_D1_PRESENT; hh->hi_fp.fp_offsets = htons(sizeof(struct hippi_le)); hh->hi_fp.fp_d2_len = htonl(d2_len); /* Pad out the D2 area to end on a quadword (64-bit) boundry. */ if (d2_len % 8 != 0) { static u_int32_t buffer[2] = {0, 0}; m_copyback(m, m->m_pkthdr.len, 8 - d2_len % 8, (caddr_t) buffer); } 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); } ifp->if_obytes += m->m_pkthdr.len; IF_ENQUEUE(&ifp->if_snd, m); 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 HIPPI packet; * the packet is in the mbuf chain m with * the HIPPI header. */ static void hippi_input(ifp, m) struct ifnet *ifp; struct mbuf *m; { struct ifqueue *inq; struct llc *l; u_int16_t htype; struct hippi_header *hh; int s; if ((ifp->if_flags & IFF_UP) == 0) { m_freem(m); return; } /* XXX: need to check flags and drop if bogus! */ hh = mtod(m, struct hippi_header *); ifp->if_lastchange = time; ifp->if_ibytes += m->m_pkthdr.len; if (hh->hi_le.le_dest_addr[0] & 1) { if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)hh->hi_le.le_dest_addr, 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++; /* Skip past the HIPPI header. */ m_adj(m, sizeof(struct hippi_header)); l = mtod(m, struct llc *); if (l->llc_dsap != LLC_SNAP_LSAP) { m_freem(m); return; } htype = ntohs(l->llc_snap.ether_type); m_adj(m, 8); switch (htype) { #ifdef INET #ifdef INET6 case ETHERTYPE_IPV6: #endif case ETHERTYPE_IP: schednetisr(NETISR_IP); inq = &ipintrq; break; #endif default: m_freem(m); return; } s = splimp(); if (IF_QFULL(inq)) { IF_DROP(inq); m_freem(m); } else IF_ENQUEUE(inq, m); splx(s); } /* * Handle packet from HIPPI that has no MAC header */ void hippi_ip_input(ifp, m) struct ifnet *ifp; struct mbuf *m; { struct ifqueue *inq; int s; u_int32_t *ip; ip = mtod(m, u_int32_t *); schednetisr(NETISR_IP); inq = &ipintrq; 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 hippi_ifattach(ifp, lla) struct ifnet *ifp; caddr_t lla; { struct sockaddr_dl *sdl; ifp->if_type = IFT_HIPPI; ifp->if_addrlen = 6; /* regular 802.3 MAC address */ ifp->if_hdrlen = sizeof(struct hippi_header) + 8; /* add CCI */ ifp->if_mtu = HIPPIMTU; ifp->if_output = hippi_output; ifp->if_input = hippi_input; ifp->if_baudrate = IF_Mbps(800); /* XXX double-check */ if ((sdl = ifp->if_sadl) && sdl->sdl_family == AF_LINK) { sdl->sdl_type = IFT_HIPPI; sdl->sdl_alen = ifp->if_addrlen; bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); } }