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/* $NetBSD: if_arcsubr.c,v 1.36 2001/06/14 05:44:23 itojun Exp $ */
/* $FreeBSD$ */
/*-
* Copyright (c) 1994, 1995 Ignatios Souvatzis
* Copyright (c) 1982, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* 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, 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp
* @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
*
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_arc.h>
#include <net/if_arp.h>
#include <net/bpf.h>
#include <net/if_llatbl.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
#define ARCNET_ALLOW_BROKEN_ARP
static struct mbuf *arc_defrag(struct ifnet *, struct mbuf *);
static int arc_resolvemulti(struct ifnet *, struct sockaddr **,
struct sockaddr *);
u_int8_t arcbroadcastaddr = 0;
#define ARC_LLADDR(ifp) (*(u_int8_t *)IF_LLADDR(ifp))
#define senderr(e) { error = (e); goto bad;}
#define SIN(s) ((const struct sockaddr_in *)(s))
/*
* ARCnet output routine.
* Encapsulate a packet of type family for the local net.
* Assumes that ifp is actually pointer to arccom structure.
*/
int
arc_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
struct route *ro)
{
struct arc_header *ah;
int error;
u_int8_t atype, adst;
int loop_copy = 0;
int isphds;
#if defined(INET) || defined(INET6)
int is_gw = 0;
#endif
if (!((ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING)))
return(ENETDOWN); /* m, m1 aren't initialized yet */
error = 0;
#if defined(INET) || defined(INET6)
if (ro != NULL)
is_gw = (ro->ro_flags & RT_HAS_GW) != 0;
#endif
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
/*
* For now, use the simple IP addr -> ARCnet addr mapping
*/
if (m->m_flags & (M_BCAST|M_MCAST))
adst = arcbroadcastaddr; /* ARCnet broadcast address */
else if (ifp->if_flags & IFF_NOARP)
adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
else {
error = arpresolve(ifp, is_gw, m, dst, &adst, NULL,
NULL);
if (error)
return (error == EWOULDBLOCK ? 0 : error);
}
atype = (ifp->if_flags & IFF_LINK0) ?
ARCTYPE_IP_OLD : ARCTYPE_IP;
break;
case AF_ARP:
{
struct arphdr *ah;
ah = mtod(m, struct arphdr *);
ah->ar_hrd = htons(ARPHRD_ARCNET);
loop_copy = -1; /* if this is for us, don't do it */
switch(ntohs(ah->ar_op)) {
case ARPOP_REVREQUEST:
case ARPOP_REVREPLY:
atype = ARCTYPE_REVARP;
break;
case ARPOP_REQUEST:
case ARPOP_REPLY:
default:
atype = ARCTYPE_ARP;
break;
}
if (m->m_flags & M_BCAST)
bcopy(ifp->if_broadcastaddr, &adst, ARC_ADDR_LEN);
else
bcopy(ar_tha(ah), &adst, ARC_ADDR_LEN);
}
break;
#endif
#ifdef INET6
case AF_INET6:
if ((m->m_flags & M_MCAST) != 0)
adst = arcbroadcastaddr; /* ARCnet broadcast address */
else {
error = nd6_resolve(ifp, is_gw, m, dst, &adst, NULL,
NULL);
if (error != 0)
return (error == EWOULDBLOCK ? 0 : error);
}
atype = ARCTYPE_INET6;
break;
#endif
case AF_UNSPEC:
{
const struct arc_header *ah;
loop_copy = -1;
ah = (const struct arc_header *)dst->sa_data;
adst = ah->arc_dhost;
atype = ah->arc_type;
if (atype == ARCTYPE_ARP) {
atype = (ifp->if_flags & IFF_LINK0) ?
ARCTYPE_ARP_OLD: ARCTYPE_ARP;
#ifdef ARCNET_ALLOW_BROKEN_ARP
/*
* XXX It's not clear per RFC826 if this is needed, but
* "assigned numbers" say this is wrong.
* However, e.g., AmiTCP 3.0Beta used it... we make this
* switchable for emergency cases. Not perfect, but...
*/
if (ifp->if_flags & IFF_LINK2)
mtod(m, struct arphdr *)->ar_pro = atype - 1;
#endif
}
break;
}
default:
if_printf(ifp, "can't handle af%d\n", dst->sa_family);
senderr(EAFNOSUPPORT);
}
isphds = arc_isphds(atype);
M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, M_NOWAIT);
if (m == NULL)
senderr(ENOBUFS);
ah = mtod(m, struct arc_header *);
ah->arc_type = atype;
ah->arc_dhost = adst;
ah->arc_shost = ARC_LLADDR(ifp);
if (isphds) {
ah->arc_flag = 0;
ah->arc_seqid = 0;
}
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, ARC_HDRLEN);
} else if (ah->arc_dhost == ah->arc_shost) {
(void) if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN);
return (0); /* XXX */
}
}
BPF_MTAP(ifp, m);
error = ifp->if_transmit(ifp, m);
return (error);
bad:
if (m)
m_freem(m);
return (error);
}
void
arc_frag_init(struct ifnet *ifp)
{
struct arccom *ac;
ac = (struct arccom *)ifp->if_l2com;
ac->curr_frag = 0;
}
struct mbuf *
arc_frag_next(struct ifnet *ifp)
{
struct arccom *ac;
struct mbuf *m;
struct arc_header *ah;
ac = (struct arccom *)ifp->if_l2com;
if ((m = ac->curr_frag) == NULL) {
int tfrags;
/* dequeue new packet */
IF_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
return 0;
ah = mtod(m, struct arc_header *);
if (!arc_isphds(ah->arc_type))
return m;
++ac->ac_seqid; /* make the seqid unique */
tfrags = howmany(m->m_pkthdr.len, ARC_MAX_DATA);
ac->fsflag = 2 * tfrags - 3;
ac->sflag = 0;
ac->rsflag = ac->fsflag;
ac->arc_dhost = ah->arc_dhost;
ac->arc_shost = ah->arc_shost;
ac->arc_type = ah->arc_type;
m_adj(m, ARC_HDRNEWLEN);
ac->curr_frag = m;
}
/* split out next fragment and return it */
if (ac->sflag < ac->fsflag) {
/* we CAN'T have short packets here */
ac->curr_frag = m_split(m, ARC_MAX_DATA, M_NOWAIT);
if (ac->curr_frag == 0) {
m_freem(m);
return 0;
}
M_PREPEND(m, ARC_HDRNEWLEN, M_NOWAIT);
if (m == NULL) {
m_freem(ac->curr_frag);
ac->curr_frag = 0;
return 0;
}
ah = mtod(m, struct arc_header *);
ah->arc_flag = ac->rsflag;
ah->arc_seqid = ac->ac_seqid;
ac->sflag += 2;
ac->rsflag = ac->sflag;
} else if ((m->m_pkthdr.len >=
ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
(m->m_pkthdr.len <=
ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
ac->curr_frag = 0;
M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_NOWAIT);
if (m == NULL)
return 0;
ah = mtod(m, struct arc_header *);
ah->arc_flag = 0xFF;
ah->arc_seqid = 0xFFFF;
ah->arc_type2 = ac->arc_type;
ah->arc_flag2 = ac->sflag;
ah->arc_seqid2 = ac->ac_seqid;
} else {
ac->curr_frag = 0;
M_PREPEND(m, ARC_HDRNEWLEN, M_NOWAIT);
if (m == NULL)
return 0;
ah = mtod(m, struct arc_header *);
ah->arc_flag = ac->sflag;
ah->arc_seqid = ac->ac_seqid;
}
ah->arc_dhost = ac->arc_dhost;
ah->arc_shost = ac->arc_shost;
ah->arc_type = ac->arc_type;
return m;
}
/*
* Defragmenter. Returns mbuf if last packet found, else
* NULL. frees incoming mbuf as necessary.
*/
static __inline struct mbuf *
arc_defrag(struct ifnet *ifp, struct mbuf *m)
{
struct arc_header *ah, *ah1;
struct arccom *ac;
struct ac_frag *af;
struct mbuf *m1;
char *s;
int newflen;
u_char src,dst,typ;
ac = (struct arccom *)ifp->if_l2com;
if (m->m_len < ARC_HDRNEWLEN) {
m = m_pullup(m, ARC_HDRNEWLEN);
if (m == NULL) {
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
return NULL;
}
}
ah = mtod(m, struct arc_header *);
typ = ah->arc_type;
if (!arc_isphds(typ))
return m;
src = ah->arc_shost;
dst = ah->arc_dhost;
if (ah->arc_flag == 0xff) {
m_adj(m, 4);
if (m->m_len < ARC_HDRNEWLEN) {
m = m_pullup(m, ARC_HDRNEWLEN);
if (m == NULL) {
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
return NULL;
}
}
ah = mtod(m, struct arc_header *);
}
af = &ac->ac_fragtab[src];
m1 = af->af_packet;
s = "debug code error";
if (ah->arc_flag & 1) {
/*
* first fragment. We always initialize, which is
* about the right thing to do, as we only want to
* accept one fragmented packet per src at a time.
*/
if (m1 != NULL)
m_freem(m1);
af->af_packet = m;
m1 = m;
af->af_maxflag = ah->arc_flag;
af->af_lastseen = 0;
af->af_seqid = ah->arc_seqid;
return NULL;
/* notreached */
} else {
/* check for unfragmented packet */
if (ah->arc_flag == 0)
return m;
/* do we have a first packet from that src? */
if (m1 == NULL) {
s = "no first frag";
goto outofseq;
}
ah1 = mtod(m1, struct arc_header *);
if (ah->arc_seqid != ah1->arc_seqid) {
s = "seqid differs";
goto outofseq;
}
if (typ != ah1->arc_type) {
s = "type differs";
goto outofseq;
}
if (dst != ah1->arc_dhost) {
s = "dest host differs";
goto outofseq;
}
/* typ, seqid and dst are ok here. */
if (ah->arc_flag == af->af_lastseen) {
m_freem(m);
return NULL;
}
if (ah->arc_flag == af->af_lastseen + 2) {
/* ok, this is next fragment */
af->af_lastseen = ah->arc_flag;
m_adj(m,ARC_HDRNEWLEN);
/*
* m_cat might free the first mbuf (with pkthdr)
* in 2nd chain; therefore:
*/
newflen = m->m_pkthdr.len;
m_cat(m1,m);
m1->m_pkthdr.len += newflen;
/* is it the last one? */
if (af->af_lastseen > af->af_maxflag) {
af->af_packet = NULL;
return(m1);
} else
return NULL;
}
s = "other reason";
/* if all else fails, it is out of sequence, too */
}
outofseq:
if (m1) {
m_freem(m1);
af->af_packet = NULL;
}
if (m)
m_freem(m);
log(LOG_INFO,"%s: got out of seq. packet: %s\n",
ifp->if_xname, s);
return NULL;
}
/*
* return 1 if Packet Header Definition Standard, else 0.
* For now: old IP, old ARP aren't obviously. Lacking correct information,
* we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
* (Apple and Novell corporations were involved, among others, in PHDS work).
* Easiest is to assume that everybody else uses that, too.
*/
int
arc_isphds(u_int8_t type)
{
return (type != ARCTYPE_IP_OLD &&
type != ARCTYPE_ARP_OLD &&
type != ARCTYPE_DIAGNOSE);
}
/*
* Process a received Arcnet packet;
* the packet is in the mbuf chain m with
* the ARCnet header.
*/
void
arc_input(struct ifnet *ifp, struct mbuf *m)
{
struct arc_header *ah;
int isr;
u_int8_t atype;
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
/* possibly defragment: */
m = arc_defrag(ifp, m);
if (m == NULL)
return;
BPF_MTAP(ifp, m);
ah = mtod(m, struct arc_header *);
/* does this belong to us? */
if ((ifp->if_flags & IFF_PROMISC) == 0
&& ah->arc_dhost != arcbroadcastaddr
&& ah->arc_dhost != ARC_LLADDR(ifp)) {
m_freem(m);
return;
}
if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
if (ah->arc_dhost == arcbroadcastaddr) {
m->m_flags |= M_BCAST|M_MCAST;
if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
}
atype = ah->arc_type;
switch (atype) {
#ifdef INET
case ARCTYPE_IP:
m_adj(m, ARC_HDRNEWLEN);
isr = NETISR_IP;
break;
case ARCTYPE_IP_OLD:
m_adj(m, ARC_HDRLEN);
isr = NETISR_IP;
break;
case ARCTYPE_ARP:
if (ifp->if_flags & IFF_NOARP) {
/* Discard packet if ARP is disabled on interface */
m_freem(m);
return;
}
m_adj(m, ARC_HDRNEWLEN);
isr = NETISR_ARP;
#ifdef ARCNET_ALLOW_BROKEN_ARP
mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
#endif
break;
case ARCTYPE_ARP_OLD:
if (ifp->if_flags & IFF_NOARP) {
/* Discard packet if ARP is disabled on interface */
m_freem(m);
return;
}
m_adj(m, ARC_HDRLEN);
isr = NETISR_ARP;
#ifdef ARCNET_ALLOW_BROKEN_ARP
mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
#endif
break;
#endif
#ifdef INET6
case ARCTYPE_INET6:
m_adj(m, ARC_HDRNEWLEN);
isr = NETISR_IPV6;
break;
#endif
default:
m_freem(m);
return;
}
M_SETFIB(m, ifp->if_fib);
netisr_dispatch(isr, m);
}
/*
* Register (new) link level address.
*/
void
arc_storelladdr(struct ifnet *ifp, u_int8_t lla)
{
ARC_LLADDR(ifp) = lla;
}
/*
* Perform common duties while attaching to interface list
*/
void
arc_ifattach(struct ifnet *ifp, u_int8_t lla)
{
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
struct arccom *ac;
if_attach(ifp);
ifp->if_addrlen = 1;
ifp->if_hdrlen = ARC_HDRLEN;
ifp->if_mtu = 1500;
ifp->if_resolvemulti = arc_resolvemulti;
if (ifp->if_baudrate == 0)
ifp->if_baudrate = 2500000;
ifa = ifp->if_addr;
KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_ARCNET;
sdl->sdl_alen = ifp->if_addrlen;
if (ifp->if_flags & IFF_BROADCAST)
ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
ac = (struct arccom *)ifp->if_l2com;
ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
if (lla == 0) {
/* XXX this message isn't entirely clear, to me -- cgd */
log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n",
ifp->if_xname, ifp->if_xname);
}
arc_storelladdr(ifp, lla);
ifp->if_broadcastaddr = &arcbroadcastaddr;
bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
}
void
arc_ifdetach(struct ifnet *ifp)
{
bpfdetach(ifp);
if_detach(ifp);
}
int
arc_ioctl(struct ifnet *ifp, u_long 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(ifp, ifa);
break;
#endif
default:
ifp->if_init(ifp->if_softc);
break;
}
break;
case SIOCGIFADDR:
{
struct sockaddr *sa;
sa = (struct sockaddr *) &ifr->ifr_data;
*(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp);
}
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
if (ifr == NULL)
error = EAFNOSUPPORT;
else {
switch (ifr->ifr_addr.sa_family) {
case AF_INET:
case AF_INET6:
error = 0;
break;
default:
error = EAFNOSUPPORT;
break;
}
}
break;
case SIOCSIFMTU:
/*
* Set the interface MTU.
* mtu can't be larger than ARCMTU for RFC1051
* and can't be larger than ARC_PHDS_MTU
*/
if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
ifr->ifr_mtu > ARC_PHDS_MAXMTU)
error = EINVAL;
else
ifp->if_mtu = ifr->ifr_mtu;
break;
}
return (error);
}
/* based on ether_resolvemulti() */
int
arc_resolvemulti(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
switch(sa->sa_family) {
case AF_LINK:
/*
* No mapping needed. Just check that it's a valid MC address.
*/
sdl = (struct sockaddr_dl *)sa;
if (*LLADDR(sdl) != arcbroadcastaddr)
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_ETHER);
sdl->sdl_alen = ARC_ADDR_LEN;
*LLADDR(sdl) = 0;
*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_ETHER);
sdl->sdl_alen = ARC_ADDR_LEN;
*LLADDR(sdl) = 0;
*llsa = (struct sockaddr *)sdl;
return 0;
#endif
default:
/*
* Well, the text isn't quite right, but it's the name
* that counts...
*/
return EAFNOSUPPORT;
}
}
static MALLOC_DEFINE(M_ARCCOM, "arccom", "ARCNET interface internals");
static void*
arc_alloc(u_char type, struct ifnet *ifp)
{
struct arccom *ac;
ac = malloc(sizeof(struct arccom), M_ARCCOM, M_WAITOK | M_ZERO);
ac->ac_ifp = ifp;
return (ac);
}
static void
arc_free(void *com, u_char type)
{
free(com, M_ARCCOM);
}
static int
arc_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
if_register_com_alloc(IFT_ARCNET, arc_alloc, arc_free);
break;
case MOD_UNLOAD:
if_deregister_com_alloc(IFT_ARCNET);
break;
default:
return EOPNOTSUPP;
}
return (0);
}
static moduledata_t arc_mod = {
"arcnet",
arc_modevent,
0
};
DECLARE_MODULE(arcnet, arc_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
MODULE_VERSION(arcnet, 1);
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