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f-stack/freebsd/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 "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_llc.h>
#include <net/if_types.h>
#include <net/if_llatbl.h>
#include <net/ethernet.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/iso88025.h>
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#endif
#ifdef INET6
#include <netinet6/nd6.h>
#endif
#include <security/mac/mac_framework.h>
static const u_char iso88025_broadcastaddr[ISO88025_ADDR_LEN] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
static int iso88025_resolvemulti (struct ifnet *, struct sockaddr **,
struct sockaddr *);
#define senderr(e) do { error = (e); goto bad; } while (0)
/*
* Perform common duties while attaching to interface list
*/
void
iso88025_ifattach(struct ifnet *ifp, const u_int8_t *lla, int bpf)
{
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
ifa = NULL;
ifp->if_type = IFT_ISO88025;
ifp->if_addrlen = ISO88025_ADDR_LEN;
ifp->if_hdrlen = ISO88025_HDR_LEN;
if_attach(ifp); /* Must be called before additional assignments */
ifp->if_output = iso88025_output;
ifp->if_input = iso88025_input;
ifp->if_resolvemulti = iso88025_resolvemulti;
ifp->if_broadcastaddr = iso88025_broadcastaddr;
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 = ifp->if_addr;
KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_ISO88025;
sdl->sdl_alen = ifp->if_addrlen;
bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
if (bpf)
bpfattach(ifp, DLT_IEEE802, ISO88025_HDR_LEN);
return;
}
/*
* Perform common duties while detaching a Token Ring interface
*/
void
iso88025_ifdetach(ifp, bpf)
struct ifnet *ifp;
int bpf;
{
if (bpf)
bpfdetach(ifp);
if_detach(ifp);
return;
}
int
iso88025_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
struct ifaddr *ifa;
struct ifreq *ifr;
int error;
ifa = (struct ifaddr *) data;
ifr = (struct ifreq *) data;
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(ifp, ifa);
break;
#endif /* INET */
default:
ifp->if_init(ifp->if_softc);
break;
}
break;
case SIOCGIFADDR: {
struct sockaddr *sa;
sa = (struct sockaddr *) & ifr->ifr_data;
bcopy(IF_LLADDR(ifp),
(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;
default:
error = EINVAL; /* XXX netbsd has ENOTTY??? */
break;
}
return (error);
}
/*
* ISO88025 encapsulation
*/
int
iso88025_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
struct route *ro)
{
u_int16_t snap_type = 0;
int loop_copy = 0, error = 0, rif_len = 0;
u_char edst[ISO88025_ADDR_LEN];
struct iso88025_header *th;
struct iso88025_header gen_th;
struct sockaddr_dl *sdl = NULL;
struct rtentry *rt0 = NULL;
int is_gw = 0;
if (ro != NULL)
is_gw = (ro->ro_flags & RT_HAS_GW) != 0;
#ifdef MAC
error = mac_ifnet_check_transmit(ifp, m);
if (error)
senderr(error);
#endif
if (ifp->if_flags & IFF_MONITOR)
senderr(ENETDOWN);
if (!((ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING)))
senderr(ENETDOWN);
getmicrotime(&ifp->if_lastchange);
/* Calculate routing info length based on arp table entry */
/* XXX any better way to do this ? */
if (rt0 && (sdl = (struct sockaddr_dl *)rt0->rt_gateway))
if (SDL_ISO88025(sdl)->trld_rcf != 0)
rif_len = TR_RCF_RIFLEN(SDL_ISO88025(sdl)->trld_rcf);
/* Generate a generic 802.5 header for the packet */
gen_th.ac = TR_AC;
gen_th.fc = TR_LLC_FRAME;
(void)memcpy((caddr_t)gen_th.iso88025_shost, IF_LLADDR(ifp),
ISO88025_ADDR_LEN);
if (rif_len) {
gen_th.iso88025_shost[0] |= TR_RII;
if (rif_len > 2) {
gen_th.rcf = SDL_ISO88025(sdl)->trld_rcf;
(void)memcpy((caddr_t)gen_th.rd,
(caddr_t)SDL_ISO88025(sdl)->trld_route,
rif_len - 2);
}
}
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
error = arpresolve(ifp, is_gw, m, dst, edst, NULL, NULL);
if (error)
return (error == EWOULDBLOCK ? 0 : error);
snap_type = ETHERTYPE_IP;
break;
case AF_ARP:
{
struct arphdr *ah;
ah = mtod(m, struct arphdr *);
ah->ar_hrd = htons(ARPHRD_IEEE802);
loop_copy = -1; /* if this is for us, don't do it */
switch(ntohs(ah->ar_op)) {
case ARPOP_REVREQUEST:
case ARPOP_REVREPLY:
snap_type = ETHERTYPE_REVARP;
break;
case ARPOP_REQUEST:
case ARPOP_REPLY:
default:
snap_type = ETHERTYPE_ARP;
break;
}
if (m->m_flags & M_BCAST)
bcopy(ifp->if_broadcastaddr, edst, ISO88025_ADDR_LEN);
else
bcopy(ar_tha(ah), edst, ISO88025_ADDR_LEN);
}
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
error = nd6_resolve(ifp, is_gw, m, dst, edst, NULL, NULL);
if (error)
return (error == EWOULDBLOCK ? 0 : error);
snap_type = ETHERTYPE_IPV6;
break;
#endif /* INET6 */
case AF_UNSPEC:
{
const struct iso88025_sockaddr_data *sd;
/*
* 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 an iso88025_sockaddr_data structure see iso88025.h
*/
loop_copy = -1;
sd = (const struct iso88025_sockaddr_data *)dst->sa_data;
gen_th.ac = sd->ac;
gen_th.fc = sd->fc;
(void)memcpy(edst, sd->ether_dhost, ISO88025_ADDR_LEN);
(void)memcpy(gen_th.iso88025_shost, sd->ether_shost,
ISO88025_ADDR_LEN);
rif_len = 0;
break;
}
default:
if_printf(ifp, "can't handle af%d\n", dst->sa_family);
senderr(EAFNOSUPPORT);
break;
}
/*
* Add LLC header.
*/
if (snap_type != 0) {
struct llc *l;
M_PREPEND(m, LLC_SNAPFRAMELEN, M_NOWAIT);
if (m == NULL)
senderr(ENOBUFS);
l = mtod(m, struct llc *);
l->llc_control = LLC_UI;
l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
l->llc_snap.org_code[0] =
l->llc_snap.org_code[1] =
l->llc_snap.org_code[2] = 0;
l->llc_snap.ether_type = htons(snap_type);
}
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
M_PREPEND(m, ISO88025_HDR_LEN + rif_len, M_NOWAIT);
if (m == NULL)
senderr(ENOBUFS);
th = mtod(m, struct iso88025_header *);
bcopy((caddr_t)edst, (caddr_t)&gen_th.iso88025_dhost, ISO88025_ADDR_LEN);
/* Copy as much of the generic header as is needed into the mbuf */
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;
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 */
}
}
IFQ_HANDOFF_ADJ(ifp, m, ISO88025_HDR_LEN + LLC_SNAPFRAMELEN, error);
if (error) {
printf("iso88025_output: packet dropped QFULL.\n");
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
}
return (error);
bad:
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
if (m)
m_freem(m);
return (error);
}
/*
* ISO 88025 de-encapsulation
*/
void
iso88025_input(ifp, m)
struct ifnet *ifp;
struct mbuf *m;
{
struct iso88025_header *th;
struct llc *l;
int isr;
int mac_hdr_len;
/*
* Do consistency checks to verify assumptions
* made by code past this point.
*/
if ((m->m_flags & M_PKTHDR) == 0) {
if_printf(ifp, "discard frame w/o packet header\n");
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
m_freem(m);
return;
}
if (m->m_pkthdr.rcvif == NULL) {
if_printf(ifp, "discard frame w/o interface pointer\n");
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
m_freem(m);
return;
}
m = m_pullup(m, ISO88025_HDR_LEN);
if (m == NULL) {
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
goto dropanyway;
}
th = mtod(m, struct iso88025_header *);
/*
* Discard packet if interface is not up.
*/
if (!((ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING)))
goto dropanyway;
/*
* Give bpf a chance at the packet.
*/
BPF_MTAP(ifp, m);
/*
* Interface marked for monitoring; discard packet.
*/
if (ifp->if_flags & IFF_MONITOR) {
m_freem(m);
return;
}
#ifdef MAC
mac_ifnet_create_mbuf(ifp, m);
#endif
/*
* Update interface statistics.
*/
if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
getmicrotime(&ifp->if_lastchange);
/*
* Discard non local unicast packets when interface
* is in promiscuous mode.
*/
if ((ifp->if_flags & IFF_PROMISC) &&
((th->iso88025_dhost[0] & 1) == 0) &&
(bcmp(IF_LLADDR(ifp), (caddr_t) th->iso88025_dhost,
ISO88025_ADDR_LEN) != 0))
goto dropanyway;
/*
* Set mbuf flags for bcast/mcast.
*/
if (th->iso88025_dhost[0] & 1) {
if (bcmp(iso88025_broadcastaddr, th->iso88025_dhost,
ISO88025_ADDR_LEN) == 0)
m->m_flags |= M_BCAST;
else
m->m_flags |= M_MCAST;
if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
}
mac_hdr_len = ISO88025_HDR_LEN;
/* Check for source routing info */
if (th->iso88025_shost[0] & TR_RII)
mac_hdr_len += TR_RCF_RIFLEN(th->rcf);
/* Strip off ISO88025 header. */
m_adj(m, mac_hdr_len);
m = m_pullup(m, LLC_SNAPFRAMELEN);
if (m == 0) {
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
goto dropanyway;
}
l = mtod(m, struct llc *);
switch (l->llc_dsap) {
case LLC_SNAP_LSAP: {
u_int16_t type;
if ((l->llc_control != LLC_UI) ||
(l->llc_ssap != LLC_SNAP_LSAP)) {
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
}
if (l->llc_snap.org_code[0] != 0 ||
l->llc_snap.org_code[1] != 0 ||
l->llc_snap.org_code[2] != 0) {
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
}
type = ntohs(l->llc_snap.ether_type);
m_adj(m, LLC_SNAPFRAMELEN);
switch (type) {
#ifdef INET
case ETHERTYPE_IP:
th->iso88025_shost[0] &= ~(TR_RII);
isr = NETISR_IP;
break;
case ETHERTYPE_ARP:
if (ifp->if_flags & IFF_NOARP)
goto dropanyway;
isr = NETISR_ARP;
break;
#endif /* INET */
#ifdef INET6
case ETHERTYPE_IPV6:
th->iso88025_shost[0] &= ~(TR_RII);
isr = NETISR_IPV6;
break;
#endif /* INET6 */
default:
printf("iso88025_input: unexpected llc_snap ether_type 0x%02x\n", type);
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
}
break;
}
#ifdef ISO
case LLC_ISO_LSAP:
switch (l->llc_control) {
case LLC_UI:
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
break;
case LLC_XID:
case LLC_XID_P:
if(m->m_len < ISO88025_ADDR_LEN)
goto dropanyway;
l->llc_window = 0;
l->llc_fid = 9;
l->llc_class = 1;
l->llc_dsap = l->llc_ssap = 0;
/* Fall through to */
case LLC_TEST:
case LLC_TEST_P:
{
struct sockaddr sa;
struct iso88025_sockaddr_data *th2;
int i;
u_char c;
c = l->llc_dsap;
if (th->iso88025_shost[0] & TR_RII) { /* XXX */
printf("iso88025_input: dropping source routed LLC_TEST\n");
goto dropanyway;
}
l->llc_dsap = l->llc_ssap;
l->llc_ssap = c;
if (m->m_flags & (M_BCAST | M_MCAST))
bcopy((caddr_t)IF_LLADDR(ifp),
(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);
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
break;
}
break;
#endif /* ISO */
default:
printf("iso88025_input: unknown dsap 0x%x\n", l->llc_dsap);
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
break;
}
M_SETFIB(m, ifp->if_fib);
netisr_dispatch(isr, m);
return;
dropanyway:
if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
if (m)
m_freem(m);
return;
}
static int
iso88025_resolvemulti (ifp, llsa, sa)
struct ifnet *ifp;
struct sockaddr **llsa;
struct sockaddr *sa;
{
struct sockaddr_dl *sdl;
#ifdef INET
struct sockaddr_in *sin;
#endif
#ifdef INET6
struct sockaddr_in6 *sin6;
#endif
u_char *e_addr;
switch(sa->sa_family) {
case AF_LINK:
/*
* No mapping needed. Just check that it's a valid MC address.
*/
sdl = (struct sockaddr_dl *)sa;
e_addr = LLADDR(sdl);
if ((e_addr[0] & 1) != 1) {
return (EADDRNOTAVAIL);
}
*llsa = NULL;
return (0);
#ifdef INET
case AF_INET:
sin = (struct sockaddr_in *)sa;
if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
return (EADDRNOTAVAIL);
}
sdl = link_init_sdl(ifp, *llsa, IFT_ISO88025);
sdl->sdl_alen = ISO88025_ADDR_LEN;
e_addr = LLADDR(sdl);
ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
*llsa = (struct sockaddr *)sdl;
return (0);
#endif
#ifdef INET6
case AF_INET6:
sin6 = (struct sockaddr_in6 *)sa;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
/*
* An IP6 address of 0 means listen to all
* of the Ethernet multicast address used for IP6.
* (This is used for multicast routers.)
*/
ifp->if_flags |= IFF_ALLMULTI;
*llsa = NULL;
return (0);
}
if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
return (EADDRNOTAVAIL);
}
sdl = link_init_sdl(ifp, *llsa, IFT_ISO88025);
sdl->sdl_alen = ISO88025_ADDR_LEN;
e_addr = LLADDR(sdl);
ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
*llsa = (struct sockaddr *)sdl;
return (0);
#endif
default:
/*
* Well, the text isn't quite right, but it's the name
* that counts...
*/
return (EAFNOSUPPORT);
}
return (0);
}
static moduledata_t iso88025_mod = {
.name = "iso88025",
};
DECLARE_MODULE(iso88025, iso88025_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(iso88025, 1);
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