407 lines
12 KiB
C
407 lines
12 KiB
C
/*
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* Copyright (c) 1998, Larry Lile
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* All rights reserved.
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*
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* For latest sources and information on this driver, please
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* go to http://anarchy.stdio.com.
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*
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* Questions, comments or suggestions should be directed to
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* Larry Lile <lile@stdio.com>.
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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 unmodified, this list of conditions, and the following
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*
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*/
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/*
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*
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* General ISO 802.5 (Token Ring) support routines
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*
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*/
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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/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.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/if_arp.h>
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#include <net/iso88025.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/if_ether.h>
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#endif
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#include <net/bpf.h>
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#include <machine/clock.h>
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#include <machine/md_var.h>
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#include <i386/isa/isa_device.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <sys/kernel.h>
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#include <net/iso88025.h>
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void
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iso88025_ifattach(ifp)
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register struct ifnet *ifp;
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{
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register struct ifaddr *ifa = NULL;
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register struct sockaddr_dl *sdl;
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ifp->if_type = IFT_ISO88025;
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ifp->if_addrlen = 6;
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ifp->if_hdrlen=18;
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if (ifp->if_baudrate == 0)
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ifp->if_baudrate = 16000000; /* 1, 4, or 16Mbit default? */
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if (ifp->if_mtu == 0)
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ifp->if_mtu = ISO88025_DEFAULT_MTU;
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ifa = ifnet_addrs[ifp->if_index - 1];
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if (ifa == 0) {
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printf("iso88025_ifattach: no lladdr!\n");
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return;
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}
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sdl = (struct sockaddr_dl *)ifa->ifa_addr;
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sdl->sdl_type = IFT_ISO88025;
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sdl->sdl_alen = ifp->if_addrlen;
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bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
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}
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int
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iso88025_ioctl(struct ifnet *ifp, int command, caddr_t data)
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{
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struct ifaddr *ifa = (struct ifaddr *) data;
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struct ifreq *ifr = (struct ifreq *) data;
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int error = 0;
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switch (command) {
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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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#ifdef INET
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case AF_INET:
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ifp->if_init(ifp->if_softc); /* before arpwhohas */
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arp_ifinit((struct arpcom *)ifp, ifa);
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break;
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#endif
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default:
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ifp->if_init(ifp->if_softc);
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break;
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}
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break;
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case SIOCGIFADDR:
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{
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struct sockaddr *sa;
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sa = (struct sockaddr *) & ifr->ifr_data;
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bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
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(caddr_t) sa->sa_data, ISO88025_ADDR_LEN);
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}
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break;
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case SIOCSIFMTU:
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/*
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* Set the interface MTU.
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*/
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if (ifr->ifr_mtu > ISO88025MTU) {
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error = EINVAL;
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} else {
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ifp->if_mtu = ifr->ifr_mtu;
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}
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break;
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}
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return (error);
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}
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/*
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* ISO88025 encapsulation
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*/
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int
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iso88025_output(ifp, m, dst, rt0)
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register struct ifnet *ifp;
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struct mbuf *m;
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struct sockaddr *dst;
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struct rtentry *rt0;
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{
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register struct iso88025_header *th;
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struct iso88025_header gen_th;
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register struct iso88025_sockaddr_data *sd = (struct iso88025_sockaddr_data *)dst->sa_data;
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register struct llc *l;
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register struct sockaddr_dl *sdl = NULL;
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int s, error = 0, rif_len = 0;
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u_char edst[6];
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register struct rtentry *rt;
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int len = m->m_pkthdr.len, loop_copy = 0;
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struct arpcom *ac = (struct arpcom *)ifp;
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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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rt = rt0;
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if (rt) {
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if ((rt->rt_flags & RTF_UP) == 0) {
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rt0 = rt = rtalloc1(dst, 1, 0UL);
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if (rt0)
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rt->rt_refcnt--;
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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) {
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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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0UL);
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if ((rt = rt->rt_gwroute) == 0)
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senderr(EHOSTUNREACH);
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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 ||
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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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/* Calculate routing info length based on arp table entry */
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if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
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if (sdl->sdl_rcf != NULL)
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rif_len = (ntohs(sdl->sdl_rcf) & 0x1f00) >> 8;
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/* Generate a generic 802.5 header for the packet */
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gen_th.ac = 0x10;
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gen_th.fc = 0x40;
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memcpy(gen_th.iso88025_shost, ac->ac_enaddr, sizeof(ac->ac_enaddr));
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if (rif_len) {
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gen_th.iso88025_shost[0] |= 0x80;
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if (rif_len > 2) {
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gen_th.rcf = sdl->sdl_rcf;
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memcpy(gen_th.rseg, sdl->sdl_route, rif_len - 2);
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}
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}
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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 (!arpresolve(ac, rt, m, dst, edst, rt0))
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return (0); /* if not yet resolved */
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/* Add LLC and SNAP headers */
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M_PREPEND(m, 8, 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_un.type_snap.ether_type = htons(ETHERTYPE_IP);
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l->llc_dsap = 0xaa;
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l->llc_ssap = 0xaa;
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l->llc_un.type_snap.control = 0x3;
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l->llc_un.type_snap.org_code[0] = 0x0;
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l->llc_un.type_snap.org_code[1] = 0x0;
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l->llc_un.type_snap.org_code[2] = 0x0;
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memcpy(gen_th.iso88025_dhost, edst, sizeof(edst));
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break;
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#endif
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case AF_UNSPEC:
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/*
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* For AF_UNSPEC sockaddr.sa_data must contain all of the
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* mac information needed to send the packet. This allows
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* full mac, llc, and source routing function to be controlled.
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* llc and source routing information must already be in the
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* mbuf provided, ac/fc are set in sa_data. sockaddr.sa_data
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* should be a iso88025_sockaddr_data structure see iso88025.h
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*/
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loop_copy = -1;
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sd = (struct iso88025_sockaddr_data *)dst->sa_data;
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gen_th.ac = sd->ac;
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gen_th.fc = sd->fc;
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memcpy(gen_th.iso88025_dhost, sd->ether_dhost, sizeof(sd->ether_dhost));
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memcpy(gen_th.iso88025_shost, sd->ether_shost, sizeof(sd->ether_shost));
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rif_len = 0;
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break;
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default:
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printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
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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, ISO88025_HDR_LEN + rif_len, M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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/* Copy as much of the generic header as is needed into the mbuf */
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th = mtod(m, struct iso88025_header *);
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memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
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/*
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* If a simplex interface, and the packet is being sent to our
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* Ethernet address or a broadcast address, loopback a copy.
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* XXX To make a simplex device behave exactly like a duplex
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* device, we should copy in the case of sending to our own
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* ethernet address (thus letting the original actually appear
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* on the wire). However, we don't do that here for security
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* reasons and compatibility with the original behavior.
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*/
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if ((ifp->if_flags & IFF_SIMPLEX) &&
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(loop_copy != -1)) {
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if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
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struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
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/*printf("iso88025_output: if_simloop broadcast.\n");*/
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(void) if_simloop(ifp, n, dst, ISO88025_HDR_LEN);
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} else if (bcmp(th->iso88025_dhost,
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th->iso88025_shost, ETHER_ADDR_LEN) == 0) {
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/*printf("iso88025_output: if_simloop to ourselves.\n");*/
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(void) if_simloop(ifp, m, dst, ISO88025_HDR_LEN);
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return(0); /* XXX */
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}
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}
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s = splimp();
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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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if (IF_QFULL(&ifp->if_snd)) {
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printf("iso88025_output: packet dropped QFULL.\n");
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IF_DROP(&ifp->if_snd);
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splx(s);
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senderr(ENOBUFS);
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}
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IF_ENQUEUE(&ifp->if_snd, m);
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/*printf("iso88025_output: packet queued.\n");*/
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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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ifp->if_obytes += len + ISO88025_HDR_LEN + 8;
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if (m->m_flags & M_MCAST)
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ifp->if_omcasts++;
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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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/*printf("iso88025_output: something went wrong, bailing to bad.\n");*/
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return (error);
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}
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/*
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* ISO 88025 de-encapsulation
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*/
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void
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iso88025_input(ifp, th, m)
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struct ifnet *ifp;
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register struct iso88025_header *th;
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struct mbuf *m;
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{
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register struct ifqueue *inq;
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u_short ether_type;
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int s;
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register struct llc *l = mtod(m, struct llc *);
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/*printf("iso88025_input: entered.\n");*/
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/*m->m_pkthdr.len = m->m_len = m->m_len - 8;*/ /* Length of LLC header in our case */
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m->m_pkthdr.len -= 8;
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m->m_len -= 8;
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m->m_data += 8; /* Length of LLC header in our case */
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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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ifp->if_ibytes += m->m_pkthdr.len + sizeof (*th);
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if (th->iso88025_dhost[0] & 1) {
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if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)th->iso88025_dhost,
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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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ether_type = ntohs(l->llc_un.type_snap.ether_type);
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/*printf("iso88025_input: source %6D dest %6D ethertype %x\n", th->iso88025_shost, ":", th->iso88025_dhost, ":", ether_type);*/
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switch (ether_type) {
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#ifdef INET
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case ETHERTYPE_IP:
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/*printf("iso88025_input: IP Packet\n");*/
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th->iso88025_shost[0] &= ~(0x80); /* Turn off source route bit XXX */
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if (ipflow_fastforward(m))
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return;
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schednetisr(NETISR_IP);
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inq = &ipintrq;
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break;
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case ETHERTYPE_ARP:
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/*printf("iso88025_input: ARP Packet\n");*/
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schednetisr(NETISR_ARP);
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inq = &arpintrq;
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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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s = splimp();
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if (IF_QFULL(inq)) {
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IF_DROP(inq);
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m_freem(m);
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printf("iso88025_input: Packet dropped (Queue full).\n");
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} else
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IF_ENQUEUE(inq, m);
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/*printf("iso88025_input: Packet queued.\n");*/
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splx(s);
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}
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