52b3d56b11
protocols, and lacking any timeouts, but it basically works, doing four-way handshakes in both directions and incoming Machine Peek operations. Oh, and Econet is Acorn's ancient, proprietary 500kbit/s networking technology.
464 lines
11 KiB
C
464 lines
11 KiB
C
/* $NetBSD: if_ecosubr.c,v 1.1 2001/09/10 23:11:06 bjh21 Exp $ */
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/*-
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* Copyright (c) 2001 Ben Harris
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* 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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "bpfilter.h"
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#include <sys/param.h>
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__KERNEL_RCSID(0, "$NetBSD: if_ecosubr.c,v 1.1 2001/09/10 23:11:06 bjh21 Exp $");
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#include <sys/errno.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_eco.h>
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#include <net/if_types.h>
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#if NBPFILTER > 0
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#include <net/bpf.h>
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#endif
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/* Default broadcast address */
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static const u_int8_t eco_broadcastaddr[] = { 0xff, 0xff };
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static int eco_output(struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *);
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static void eco_input(struct ifnet *, struct mbuf *);
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static void eco_start(struct ifnet *);
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static int eco_ioctl(struct ifnet *, u_long, caddr_t);
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static int eco_interestingp(struct ifnet *ifp, struct mbuf *m);
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static struct mbuf *eco_immediate(struct ifnet *ifp, struct mbuf *m);
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static struct mbuf *eco_ack(struct ifnet *ifp, struct mbuf *m);
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void
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eco_ifattach(struct ifnet *ifp, const u_int8_t *lla)
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{
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struct ecocom *ec = (void *)ifp;
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ifp->if_type = IFT_OTHER;
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ifp->if_addrlen = ECO_ADDR_LEN;
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ifp->if_hdrlen = ECO_HDR_LEN;
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ifp->if_dlt = DLT_ECONET;
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ifp->if_mtu = ECO_MTU;
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ifp->if_output = eco_output;
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ifp->if_input = eco_input;
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ifp->if_start = eco_start;
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ifp->if_ioctl = eco_ioctl;
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/* ifp->if_baudrate...; */
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if_alloc_sadl(ifp);
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memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen);
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/* XXX cast safe? */
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ifp->if_broadcastaddr = (u_int8_t *)eco_broadcastaddr;
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ec->ec_state = ECO_IDLE;
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#if NBPFILTER > 0
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bpfattach(ifp, ifp->if_dlt, ECO_HDR_LEN);
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#endif
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}
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#define senderr(e) do { \
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error = (e); \
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goto bad; \
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} while (/*CONSTCOND*/0)
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static int
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eco_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
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struct rtentry *rt0)
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{
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struct eco_header ehdr, *eh;
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int error, s;
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struct mbuf *m = m0;
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int hdrcmplt;
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size_t 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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/*
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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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hdrcmplt = 0;
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switch (dst->sa_family) {
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case pseudo_AF_HDRCMPLT:
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hdrcmplt = 1;
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/* FALLTHROUGH */
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case AF_UNSPEC:
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eh = (struct eco_header *)dst->sa_data;
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ehdr = *eh;
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break;
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default:
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log(LOG_ERR, "%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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/*
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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 eco_header), M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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eh = mtod(m, struct eco_header *);
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*eh = ehdr;
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if (!hdrcmplt)
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memcpy(eh->eco_shost, LLADDR(ifp->if_sadl),
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ECO_ADDR_LEN);
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#ifdef PFIL_HOOKS
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if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0)
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return (error);
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if (m == NULL)
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return (0);
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#endif
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/*
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* Queue message on interface, and start output if interface
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* not yet active.
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*/
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len = m->m_pkthdr.len;
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s = splnet();
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IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error);
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if (error) {
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splx(s);
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return (error);
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}
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ifp->if_obytes += len;
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if ((ifp->if_flags & IFF_OACTIVE) == 0)
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(*ifp->if_start)(ifp);
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splx(s);
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return (error);
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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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* Given a scout, decide if we want the rest of the packet.
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*/
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static int
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eco_interestingp(struct ifnet *ifp, struct mbuf *m)
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{
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/* Until we get some higher-level protocols, we don't care. */
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return 0;
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}
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static void
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eco_input(struct ifnet *ifp, struct mbuf *m)
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{
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/* We should really _do_ something with this packet. */
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m_freem(m);
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}
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static void
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eco_start(struct ifnet *ifp)
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{
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struct ecocom *ec = (void *)ifp;
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struct mbuf *m;
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struct eco_header *eh;
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for (;;) {
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IFQ_DEQUEUE(&ifp->if_snd, m);
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if (!m) break;
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if (ec->ec_claimwire(ifp) == 0) {
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eh = mtod(m, struct eco_header *);
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if (eh->eco_port == ECO_PORT_IMMEDIATE) {
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ec->ec_txframe(ifp, m);
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ec->ec_state = ECO_IMMED_SENT;
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} else if (eh->eco_dhost[0] == 255) {
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ec->ec_txframe(ifp, m);
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} else {
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ec->ec_packet = m;
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m = m_copym(m, 0, ECO_HDR_LEN, M_DONTWAIT);
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if (m == NULL) {
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m_freem(ec->ec_packet);
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return;
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}
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ec->ec_txframe(ifp, m);
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ec->ec_state = ECO_SCOUT_SENT;
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}
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} else {
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log(LOG_ERR, "%s: line jammed\n", ifp->if_xname);
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m_freem(m);
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}
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}
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}
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static int
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eco_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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struct ifreq *ifr = (struct ifreq *)data;
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struct ifaddr *ifa = (struct ifaddr *)data;
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int error = 0;
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switch (cmd) {
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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switch (ifa->ifa_addr->sa_family) {
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default:
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if ((ifp->if_flags & IFF_RUNNING) == 0)
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error = (*ifp->if_init)(ifp);
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break;
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}
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break;
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case SIOCSIFMTU:
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ifp->if_mtu = ifr->ifr_mtu;
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/* Make sure the device notices the MTU change. */
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if (ifp->if_flags & IFF_UP)
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error = (*ifp->if_init)(ifp);
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break;
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case SIOCSIFFLAGS:
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if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) {
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/*
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* If interface is marked down and it is running,
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* then stop and disable it.
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*/
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(*ifp->if_stop)(ifp, 1);
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} else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) {
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/*
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* If interface is marked up and it is stopped, then
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* start it.
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*/
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error = (*ifp->if_init)(ifp);
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} else if ((ifp->if_flags & IFF_UP) != 0) {
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/*
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* Reset the interface to pick up changes in any other
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* flags that affect the hardware state.
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*/
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error = (*ifp->if_init)(ifp);
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}
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break;
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default:
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error = ENOTTY;
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}
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return error;
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}
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/*
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* Handle a raw Econet frame off the interface. The interface may be
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* flag-filling for a response.
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*
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* May be called from IPL_NET or IPL_SOFTNET.
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*/
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struct mbuf *
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eco_inputframe(struct ifnet *ifp, struct mbuf *m)
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{
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struct ecocom *ec = (void *)ifp;
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struct eco_header *eh;
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struct mbuf *m0;
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struct mbuf *reply;
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int len;
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eh = mtod(m, struct eco_header *);
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switch (ec->ec_state) {
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case ECO_IDLE:
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if (memcmp(eh->eco_dhost, eco_broadcastaddr,
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ECO_ADDR_LEN) == 0) {
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/* Broadcast */
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/* XXX eco_input(ifp, m) */
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m_freem(m);
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} else if (memcmp(eh->eco_dhost, LLADDR(ifp->if_sadl),
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ECO_ADDR_LEN) == 0) {
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/* Unicast for us */
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if (eh->eco_port == ECO_PORT_IMMEDIATE)
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return eco_immediate(ifp, m);
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else {
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if (eco_interestingp(ifp, m)) {
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reply = eco_ack(ifp, m);
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if (reply == NULL) {
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m_freem(m);
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return NULL;
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}
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ec->ec_state = ECO_SCOUT_RCVD;
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ec->ec_scout = m;
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return reply;
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} else {
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m_freem(m);
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return NULL;
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}
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}
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} else
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/* Not for us. Throw it away. */
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m_freem(m);
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break;
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case ECO_SCOUT_RCVD:
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KASSERT(ec->ec_scout != NULL);
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reply = eco_ack(ifp, m);
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/* XXX should check that headers match. */
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/*
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* Chop off the small header from this frame, and put
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* the scout (which holds the control byte and port)
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* in its place.
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*/
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m0 = ec->ec_scout;
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ec->ec_scout = NULL;
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m_adj(m, ECO_SHDR_LEN);
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len = m0->m_pkthdr.len + m->m_pkthdr.len;
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m_cat(m0, m);
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m0->m_pkthdr.len = len;
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ec->ec_state = ECO_DONE;
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eco_input(ifp, m0);
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return reply;
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case ECO_SCOUT_SENT:
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KASSERT(ec->ec_packet != NULL);
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/* XXX should check ack fields for correctness */
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m_freem(m);
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/* Chop out the control and port bytes. */
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m0 = m_copym(ec->ec_packet, 0, ECO_SHDR_LEN, M_DONTWAIT);
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if (m0 == NULL) {
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m_freem(ec->ec_packet);
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return NULL;
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}
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m = m_copypacket(ec->ec_packet, M_DONTWAIT);
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if (m == NULL) {
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m_freem(m0);
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m_freem(ec->ec_packet);
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return NULL;
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}
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m_adj(m, ECO_HDR_LEN);
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len = m0->m_pkthdr.len + m->m_pkthdr.len;
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m_cat(m0, m); /* Doesn't update packet header */
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m0->m_pkthdr.len = len;
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ec->ec_state = ECO_DATA_SENT;
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return m0;
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case ECO_DATA_SENT:
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KASSERT(ec->ec_packet != NULL);
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/* XXX check ack fields? */
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m_freem(m);
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m_freem(ec->ec_packet);
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ec->ec_packet = NULL;
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ec->ec_state = ECO_DONE;
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return NULL;
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default:
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m_freem(m);
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break;
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}
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return NULL;
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}
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/*
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* Handle an immediate operation, and return the reply, or NULL not to reply.
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* Frees the incoming mbuf.
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*/
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static struct mbuf *
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eco_immediate(struct ifnet *ifp, struct mbuf *m)
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{
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struct eco_header *eh, *reh;
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struct mbuf *n;
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static const u_int8_t machinepeek_data[] = { 42, 0, 0, 1 };
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eh = mtod(m, struct eco_header *);
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switch (eh->eco_control) {
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case ECO_CTL_MACHINEPEEK:
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MGETHDR(n, M_DONTWAIT, MT_DATA);
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if (n == NULL)
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goto bad;
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n->m_len = n->m_pkthdr.len = ECO_SHDR_LEN + 4;
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reh = mtod(n, struct eco_header *);
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memcpy(reh->eco_dhost, eh->eco_shost,
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ECO_ADDR_LEN);
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memcpy(reh->eco_shost, LLADDR(ifp->if_sadl),
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ECO_ADDR_LEN);
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memcpy(mtod(n, caddr_t) + ECO_SHDR_LEN, machinepeek_data,
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sizeof(machinepeek_data));
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m_freem(m);
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return n;
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default:
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bad:
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m_freem(m);
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return NULL;
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}
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}
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/*
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* Generate (and return) an acknowledgement for a frame. Doesn't free the
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* original frame, since it's probably needed elsewhere.
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*/
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static struct mbuf *
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eco_ack(struct ifnet *ifp, struct mbuf *m)
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{
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struct eco_header *eh, *reh;
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struct mbuf *n;
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eh = mtod(m, struct eco_header *);
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MGETHDR(n, M_DONTWAIT, MT_DATA);
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if (n == NULL)
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return NULL;
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n->m_len = n->m_pkthdr.len = ECO_SHDR_LEN;
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reh = mtod(n, struct eco_header *);
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memcpy(reh->eco_dhost, eh->eco_shost, ECO_ADDR_LEN);
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memcpy(reh->eco_shost, LLADDR(ifp->if_sadl), ECO_ADDR_LEN);
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return n;
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}
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void
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eco_inputidle(struct ifnet *ifp)
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{
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struct ecocom *ec = (void *)ifp;
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ec->ec_state = ECO_IDLE;
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m_freem(ec->ec_scout);
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ec->ec_scout = NULL;
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}
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/*
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* Convert Econet address to printable (loggable) representation.
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*/
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char *
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eco_sprintf(const u_int8_t *ea)
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{
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static char buf[8];
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if (ea[1] == 0)
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sprintf(buf, "%d", ea[0]);
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else
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sprintf(buf, "%d.%d", ea[1], ea[0]);
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return buf;
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}
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