330 lines
8.3 KiB
C
330 lines
8.3 KiB
C
/* $NetBSD: if_hippisubr.c,v 1.41 2014/06/05 23:48:16 rmind Exp $ */
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/*
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* Copyright (c) 1982, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_hippisubr.c,v 1.41 2014/06/05 23:48:16 rmind Exp $");
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <sys/cpu.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/if_llc.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/bpf.h>
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#include <net/if_hippi.h>
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#include <netinet/in.h>
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#if defined(INET) || defined(INET6)
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#include <netinet/in_var.h>
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#endif
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#define senderr(e) { error = (e); goto bad;}
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#ifndef llc_snap
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#define llc_snap llc_un.type_snap
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#endif
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static int hippi_output(struct ifnet *, struct mbuf *,
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const struct sockaddr *, struct rtentry *);
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static void hippi_input(struct ifnet *, struct mbuf *);
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/*
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* HIPPI output routine.
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* Encapsulate a packet of type family for the local net.
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* I don't know anything about the mapping of AppleTalk or OSI
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* protocols to HIPPI, so I don't include any code for them.
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*/
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static int
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hippi_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst,
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struct rtentry *rt0)
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{
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uint16_t htype;
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uint32_t ifield = 0;
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int error = 0;
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struct mbuf *m = m0;
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struct rtentry *rt;
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struct hippi_header *hh;
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uint32_t *cci;
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uint32_t d2_len;
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ALTQ_DECL(struct altq_pktattr pktattr;)
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if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
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senderr(ENETDOWN);
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/* HIPPI doesn't really do broadcast or multicast right now */
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if (m->m_flags & (M_BCAST | M_MCAST))
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senderr(EOPNOTSUPP); /* XXX: some other error? */
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if ((rt = rt0) != NULL) {
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if ((rt->rt_flags & RTF_UP) == 0) {
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if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) {
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rt->rt_refcnt--;
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if (rt->rt_ifp != ifp)
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return (*rt->rt_ifp->if_output)
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(ifp, m0, dst, rt);
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} else
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senderr(EHOSTUNREACH);
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}
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if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) {
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if (rt->rt_gwroute == 0)
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goto lookup;
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if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
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rtfree(rt); rt = rt0;
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lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1);
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if ((rt = rt->rt_gwroute) == 0)
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senderr(EHOSTUNREACH);
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/* the "G" test below also prevents rt == rt0 */
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if ((rt->rt_flags & RTF_GATEWAY) ||
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(rt->rt_ifp != ifp)) {
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rt->rt_refcnt--;
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rt0->rt_gwroute = 0;
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senderr(EHOSTUNREACH);
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}
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}
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}
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if (rt->rt_flags & RTF_REJECT)
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if (rt->rt_rmx.rmx_expire == 0 || /* XXX: no ARP */
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time_second < rt->rt_rmx.rmx_expire)
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senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
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}
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/*
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* If the queueing discipline needs packet classification,
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* do it before prepending link headers.
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*/
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IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr);
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switch (dst->sa_family) {
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#ifdef INET
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case AF_INET:
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if (rt) {
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const struct sockaddr_dl *sdl =
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satocsdl(rt->rt_gateway);
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if (sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0)
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memcpy(&ifield, CLLADDR(sdl), sizeof(ifield));
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}
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if (!ifield) /* XXX: bogus check, but helps us get going */
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senderr(EHOSTUNREACH);
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htype = htons(ETHERTYPE_IP);
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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if (rt) {
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const struct sockaddr_dl *sdl =
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satocsdl(rt->rt_gateway);
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if (sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0)
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memcpy(&ifield, CLLADDR(sdl), sizeof(ifield));
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}
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if (!ifield) /* XXX: bogus check, but helps us get going */
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senderr(EHOSTUNREACH);
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htype = htons(ETHERTYPE_IPV6);
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break;
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#endif
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default:
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printf("%s: can't handle af%d\n", ifp->if_xname,
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dst->sa_family);
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senderr(EAFNOSUPPORT);
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}
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if (htype != 0) {
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struct llc *l;
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M_PREPEND(m, sizeof (struct llc), M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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l = mtod(m, struct llc *);
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l->llc_control = LLC_UI;
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l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
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l->llc_snap.org_code[0] = l->llc_snap.org_code[1] =
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l->llc_snap.org_code[2] = 0;
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memcpy((void *) &l->llc_snap.ether_type, (void *) &htype,
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sizeof(uint16_t));
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}
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d2_len = m->m_pkthdr.len;
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/*
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* Add local net header. If no space in first mbuf,
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* allocate another.
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*/
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M_PREPEND(m, sizeof (struct hippi_header) + 8, M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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cci = mtod(m, uint32_t *);
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memset(cci, 0, sizeof(struct hippi_header) + 8);
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cci[0] = 0;
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cci[1] = ifield;
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hh = (struct hippi_header *) &cci[2];
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hh->hi_fp.fp_ulp = HIPPI_ULP_802;
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hh->hi_fp.fp_flags = HIPPI_FP_D1_PRESENT;
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hh->hi_fp.fp_offsets = htons(sizeof(struct hippi_le));
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hh->hi_fp.fp_d2_len = htonl(d2_len);
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/* Pad out the D2 area to end on a quadword (64-bit) boundry. */
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if (d2_len % 8 != 0) {
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static uint32_t buffer[2] = {0, 0};
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m_copyback(m, m->m_pkthdr.len, 8 - d2_len % 8, (void *) buffer);
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}
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return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr));
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bad:
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if (m)
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m_freem(m);
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return (error);
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}
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/*
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* Process a received HIPPI packet;
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* the packet is in the mbuf chain m with
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* the HIPPI header.
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*/
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static void
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hippi_input(struct ifnet *ifp, struct mbuf *m)
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{
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pktqueue_t *pktq;
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struct llc *l;
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uint16_t htype;
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struct hippi_header *hh;
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if ((ifp->if_flags & IFF_UP) == 0) {
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m_freem(m);
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return;
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}
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/* XXX: need to check flags and drop if bogus! */
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hh = mtod(m, struct hippi_header *);
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ifp->if_ibytes += m->m_pkthdr.len;
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if (hh->hi_le.le_dest_addr[0] & 1) {
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if (memcmp(etherbroadcastaddr, hh->hi_le.le_dest_addr,
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sizeof(etherbroadcastaddr)) == 0)
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m->m_flags |= M_BCAST;
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else
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m->m_flags |= M_MCAST;
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}
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if (m->m_flags & (M_BCAST|M_MCAST))
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ifp->if_imcasts++;
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/* Skip past the HIPPI header. */
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m_adj(m, sizeof(struct hippi_header));
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l = mtod(m, struct llc *);
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if (l->llc_dsap != LLC_SNAP_LSAP) {
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m_freem(m);
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return;
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}
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htype = ntohs(l->llc_snap.ether_type);
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m_adj(m, 8);
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switch (htype) {
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#ifdef INET
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case ETHERTYPE_IP:
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pktq = ip_pktq;
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break;
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#endif
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#ifdef INET6
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case ETHERTYPE_IPV6:
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pktq = ip6_pktq;
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break;
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#endif
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default:
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m_freem(m);
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return;
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}
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if (__predict_false(!pktq_enqueue(pktq, m, 0))) {
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m_freem(m);
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}
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}
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/*
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* Handle packet from HIPPI that has no MAC header
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*/
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#ifdef INET
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void
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hippi_ip_input(struct ifnet *ifp, struct mbuf *m)
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{
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int s;
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s = splnet();
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if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) {
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m_freem(m);
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}
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splx(s);
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}
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#endif
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/*
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* Perform common duties while attaching to interface list
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*/
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void
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hippi_ifattach(struct ifnet *ifp, void *lla)
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{
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ifp->if_type = IFT_HIPPI;
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ifp->if_hdrlen = sizeof(struct hippi_header) + 8; /* add CCI */
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ifp->if_dlt = DLT_HIPPI;
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ifp->if_mtu = HIPPIMTU;
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ifp->if_output = hippi_output;
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ifp->if_input = hippi_input;
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ifp->if_baudrate = IF_Mbps(800); /* XXX double-check */
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if_set_sadl(ifp, lla, 6, true);
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bpf_attach(ifp, DLT_HIPPI, sizeof(struct hippi_header));
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}
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