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freebsd/sys/net/if_iso88025subr.c

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/*
* Copyright (c) 1998, Larry Lile
* All rights reserved.
*
* For latest sources and information on this driver, please
* go to http://anarchy.stdio.com.
*
* Questions, comments or suggestions should be directed to
* Larry Lile <lile@stdio.com>.
*
* 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 unmodified, 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*
*/
/*
*
* General ISO 802.5 (Token Ring) support routines
*
*/
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/if_llc.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_arp.h>
#include <net/iso88025.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#endif
#include <net/bpf.h>
#include <machine/clock.h>
#include <machine/md_var.h>
#include <i386/isa/isa_device.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <net/iso88025.h>
void
iso88025_ifattach(struct ifnet *ifp)
{
register struct ifaddr *ifa = NULL;
register struct sockaddr_dl *sdl;
ifp->if_type = IFT_ISO88025;
ifp->if_addrlen = ISO88025_ADDR_LEN;
ifp->if_hdrlen = ISO88025_HDR_LEN;
if (ifp->if_baudrate == 0)
ifp->if_baudrate = TR_16MBPS; /* 16Mbit should be a safe default */
if (ifp->if_mtu == 0)
ifp->if_mtu = ISO88025_DEFAULT_MTU;
ifa = ifnet_addrs[ifp->if_index - 1];
if (ifa == 0) {
printf("iso88025_ifattach: no lladdr!\n");
return;
}
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_ISO88025;
sdl->sdl_alen = ifp->if_addrlen;
bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
}
int
iso88025_ioctl(struct ifnet *ifp, int command, caddr_t data)
{
struct ifaddr *ifa = (struct ifaddr *) data;
struct ifreq *ifr = (struct ifreq *) data;
int error = 0;
switch (command) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
ifp->if_init(ifp->if_softc); /* before arpwhohas */
arp_ifinit((struct arpcom *)ifp, ifa);
break;
#endif
default:
ifp->if_init(ifp->if_softc);
break;
}
break;
case SIOCGIFADDR:
{
struct sockaddr *sa;
sa = (struct sockaddr *) & ifr->ifr_data;
bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
(caddr_t) sa->sa_data, ISO88025_ADDR_LEN);
}
break;
case SIOCSIFMTU:
/*
* Set the interface MTU.
*/
if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
error = EINVAL;
} else {
ifp->if_mtu = ifr->ifr_mtu;
}
break;
}
return (error);
}
/*
* ISO88025 encapsulation
*/
int
iso88025_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rt0)
{
register struct iso88025_header *th;
struct iso88025_header gen_th;
register struct iso88025_sockaddr_data *sd = (struct iso88025_sockaddr_data *)dst->sa_data;
register struct llc *l;
register struct sockaddr_dl *sdl = NULL;
int s, error = 0, rif_len = 0;
u_char edst[6];
register struct rtentry *rt;
int len = m->m_pkthdr.len, loop_copy = 0;
struct arpcom *ac = (struct arpcom *)ifp;
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
rt = rt0;
if (rt) {
if ((rt->rt_flags & RTF_UP) == 0) {
rt0 = rt = rtalloc1(dst, 1, 0UL);
if (rt0)
rt->rt_refcnt--;
else
senderr(EHOSTUNREACH);
}
if (rt->rt_flags & RTF_GATEWAY) {
if (rt->rt_gwroute == 0)
goto lookup;
if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
rtfree(rt); rt = rt0;
lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
0UL);
if ((rt = rt->rt_gwroute) == 0)
senderr(EHOSTUNREACH);
}
}
if (rt->rt_flags & RTF_REJECT)
if (rt->rt_rmx.rmx_expire == 0 ||
time_second < rt->rt_rmx.rmx_expire)
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
}
/* Calculate routing info length based on arp table entry */
if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
if (sdl->sdl_rcf != NULL)
rif_len = TR_RCF_RIFLEN(sdl->sdl_rcf);
/* Generate a generic 802.5 header for the packet */
gen_th.ac = TR_AC;
gen_th.fc = TR_LLC_FRAME;
memcpy(gen_th.iso88025_shost, ac->ac_enaddr, sizeof(ac->ac_enaddr));
if (rif_len) {
gen_th.iso88025_shost[0] |= TR_RII;
if (rif_len > 2) {
gen_th.rcf = sdl->sdl_rcf;
memcpy(gen_th.rd, sdl->sdl_route, rif_len - 2);
}
}
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
if (!arpresolve(ac, rt, m, dst, edst, rt0))
return (0); /* if not yet resolved */
/* Add LLC and SNAP headers */
M_PREPEND(m, 8, M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
l = mtod(m, struct llc *);
l->llc_un.type_snap.ether_type = htons(ETHERTYPE_IP);
l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
l->llc_un.type_snap.control = LLC_UI;
l->llc_un.type_snap.org_code[0] = 0x0;
l->llc_un.type_snap.org_code[1] = 0x0;
l->llc_un.type_snap.org_code[2] = 0x0;
memcpy(gen_th.iso88025_dhost, edst, sizeof(edst));
break;
#endif
case AF_UNSPEC:
/*
* For AF_UNSPEC sockaddr.sa_data must contain all of the
* mac information needed to send the packet. This allows
* full mac, llc, and source routing function to be controlled.
* llc and source routing information must already be in the
* mbuf provided, ac/fc are set in sa_data. sockaddr.sa_data
* should be a iso88025_sockaddr_data structure see iso88025.h
*/
loop_copy = -1;
sd = (struct iso88025_sockaddr_data *)dst->sa_data;
gen_th.ac = sd->ac;
gen_th.fc = sd->fc;
memcpy(gen_th.iso88025_dhost, sd->ether_dhost, sizeof(sd->ether_dhost));
memcpy(gen_th.iso88025_shost, sd->ether_shost, sizeof(sd->ether_shost));
rif_len = 0;
break;
default:
printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
dst->sa_family);
senderr(EAFNOSUPPORT);
}
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
M_PREPEND(m, ISO88025_HDR_LEN + rif_len, M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
/* Copy as much of the generic header as is needed into the mbuf */
th = mtod(m, struct iso88025_header *);
memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
/*
* If a simplex interface, and the packet is being sent to our
* Ethernet address or a broadcast address, loopback a copy.
* XXX To make a simplex device behave exactly like a duplex
* device, we should copy in the case of sending to our own
* ethernet address (thus letting the original actually appear
* on the wire). However, we don't do that here for security
* reasons and compatibility with the original behavior.
*/
if ((ifp->if_flags & IFF_SIMPLEX) &&
(loop_copy != -1)) {
if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
(void) if_simloop(ifp,
n, dst->sa_family, ISO88025_HDR_LEN);
} else if (bcmp(th->iso88025_dhost,
th->iso88025_shost, ETHER_ADDR_LEN) == 0) {
(void) if_simloop(ifp,
m, dst->sa_family, ISO88025_HDR_LEN);
return(0); /* XXX */
}
}
s = splimp();
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
if (IF_QFULL(&ifp->if_snd)) {
printf("iso88025_output: packet dropped QFULL.\n");
IF_DROP(&ifp->if_snd);
splx(s);
senderr(ENOBUFS);
}
IF_ENQUEUE(&ifp->if_snd, m);
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
splx(s);
ifp->if_obytes += len + ISO88025_HDR_LEN + 8;
if (m->m_flags & M_MCAST)
ifp->if_omcasts++;
return (error);
bad:
if (m)
m_freem(m);
return (error);
}
/*
* ISO 88025 de-encapsulation
*/
void
iso88025_input(struct ifnet *ifp, struct iso88025_header *th, struct mbuf *m)
{
register struct ifqueue *inq;
u_short ether_type;
int s;
register struct llc *l = mtod(m, struct llc *);
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
switch (l->llc_control) {
case LLC_UI:
break;
case LLC_TEST:
case LLC_TEST_P:
{
struct sockaddr sa;
struct arpcom *ac = (struct arpcom *)ifp;
struct iso88025_sockaddr_data *th2;
int i;
u_char c = l->llc_dsap;
if (th->iso88025_shost[0] & TR_RII) { /* XXX */
printf("iso88025_input: dropping source routed LLC_TEST\n");
m_free(m);
return;
}
l->llc_dsap = l->llc_ssap;
l->llc_ssap = c;
if (m->m_flags & (M_BCAST | M_MCAST))
bcopy((caddr_t)ac->ac_enaddr,
(caddr_t)th->iso88025_dhost, ISO88025_ADDR_LEN);
sa.sa_family = AF_UNSPEC;
sa.sa_len = sizeof(sa);
th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
for (i = 0; i < ISO88025_ADDR_LEN; i++) {
th2->ether_shost[i] = c = th->iso88025_dhost[i];
th2->ether_dhost[i] = th->iso88025_dhost[i] = th->iso88025_shost[i];
th->iso88025_shost[i] = c;
}
th2->ac = TR_AC;
th2->fc = TR_LLC_FRAME;
ifp->if_output(ifp, m, &sa, NULL);
return;
}
default:
printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
m_freem(m);
return;
}
m->m_pkthdr.len -= 8;
m->m_len -= 8;
m->m_data += 8; /* Length of LLC header in our case */
ifp->if_ibytes += m->m_pkthdr.len + sizeof(*th);
if (th->iso88025_dhost[0] & 1) {
if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)th->iso88025_dhost, 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++;
ether_type = ntohs(l->llc_un.type_snap.ether_type);
switch (ether_type) {
#ifdef INET
case ETHERTYPE_IP:
th->iso88025_shost[0] &= ~(TR_RII);
if (ipflow_fastforward(m))
return;
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
case ETHERTYPE_ARP:
schednetisr(NETISR_ARP);
inq = &arpintrq;
break;
#endif
default:
m_freem(m);
return;
}
s = splimp();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
printf("iso88025_input: Packet dropped (Queue full).\n");
} else
IF_ENQUEUE(inq, m);
splx(s);
}
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