static void
ddp_input(struct mbuf *m, struct ifnet *ifp, struct elaphdr *elh, int phase)
{
struct sockaddr_at from, to;
struct ddpshdr *dsh, ddps;
struct at_ifaddr *aa;
struct ddpehdr *deh = NULL, ddpe;
struct ddpcb *ddp;
int dlen, mlen;
u_short cksum = 0;
bzero( (caddr_t)&from, sizeof( struct sockaddr_at ));
bzero( (caddr_t)&to, sizeof( struct sockaddr_at ));
if ( elh ) {
/*
* Extract the information in the short header.
* netowrk information is defaulted to ATADDR_ANYNET
* and node information comes from the elh info.
* We must be phase 1.
*/
ddpstat.ddps_short++;
if ( m->m_len < sizeof( struct ddpshdr ) &&
(( m = m_pullup( m, sizeof( struct ddpshdr ))) == 0 )) {
ddpstat.ddps_tooshort++;
return;
}
dsh = mtod( m, struct ddpshdr *);
bcopy( (caddr_t)dsh, (caddr_t)&ddps, sizeof( struct ddpshdr ));
ddps.dsh_bytes = ntohl( ddps.dsh_bytes );
dlen = ddps.dsh_len;
to.sat_addr.s_net = ATADDR_ANYNET;
to.sat_addr.s_node = elh->el_dnode;
to.sat_port = ddps.dsh_dport;
from.sat_addr.s_net = ATADDR_ANYNET;
from.sat_addr.s_node = elh->el_snode;
from.sat_port = ddps.dsh_sport;
/*
* Make sure that we point to the phase1 ifaddr info
* and that it's valid for this packet.
*/
for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
if ( (aa->aa_ifp == ifp)
&& ( (aa->aa_flags & AFA_PHASE2) == 0)
&& ( (to.sat_addr.s_node == AA_SAT( aa )->sat_addr.s_node)
|| (to.sat_addr.s_node == ATADDR_BCAST))) {
break;
}
}
/*
* maybe we got a broadcast not meant for us.. ditch it.
*/
if ( aa == NULL ) {
m_freem( m );
return;
}
} else {
/*
* For the moment, this just find the pcb with the correct local address.
* In the future, this will actually do some real searching, so we can use
* the sender's address to do de-multiplexing on a single port to many
* sockets (pcbs).
*/
struct ddpcb *
ddp_search( struct sockaddr_at *from, struct sockaddr_at *to,
struct at_ifaddr *aa)
{
struct ddpcb *ddp;
/*
* Check for bad ports.
*/
if ( to->sat_port < ATPORT_FIRST || to->sat_port >= ATPORT_LAST ) {
return( NULL );
}
/*
* Make sure the local address matches the sent address. What about
* the interface?
*/
for ( ddp = ddp_ports[ to->sat_port - 1 ]; ddp; ddp = ddp->ddp_pnext ) {
/* XXX should we handle 0.YY? */
/* XXXX.YY to socket on destination interface */
if ( to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net &&
to->sat_addr.s_node == ddp->ddp_lsat.sat_addr.s_node ) {
break;
}
/* 0.255 to socket on receiving interface */
if ( to->sat_addr.s_node == ATADDR_BCAST && ( to->sat_addr.s_net == 0 ||
to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net ) &&
ddp->ddp_lsat.sat_addr.s_net == AA_SAT( aa )->sat_addr.s_net ) {
break;
}
/* XXXX.0 to socket on destination interface */
if ( to->sat_addr.s_net == aa->aa_firstnet &&
to->sat_addr.s_node == 0 &&
ntohs( ddp->ddp_lsat.sat_addr.s_net ) >=
ntohs( aa->aa_firstnet ) &&
ntohs( ddp->ddp_lsat.sat_addr.s_net ) <=
ntohs( aa->aa_lastnet )) {
break;
}
}
return( ddp );
}
static void
aarpwhohas( struct arpcom *ac, struct sockaddr_at *sat )
{
struct mbuf *m;
struct ether_header *eh;
struct ether_aarp *ea;
struct at_ifaddr *aa;
struct llc *llc;
struct sockaddr sa;
if (( m = m_gethdr( M_DONTWAIT, MT_DATA )) == NULL ) {
return;
}
#ifdef MAC
mac_create_mbuf_linklayer(&ac->ac_if, m);
#endif
m->m_len = sizeof( *ea );
m->m_pkthdr.len = sizeof( *ea );
MH_ALIGN( m, sizeof( *ea ));
ea = mtod( m, struct ether_aarp *);
bzero((caddr_t)ea, sizeof( *ea ));
ea->aarp_hrd = htons( AARPHRD_ETHER );
ea->aarp_pro = htons( ETHERTYPE_AT );
ea->aarp_hln = sizeof( ea->aarp_sha );
ea->aarp_pln = sizeof( ea->aarp_spu );
ea->aarp_op = htons( AARPOP_REQUEST );
bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
sizeof( ea->aarp_sha ));
/*
* We need to check whether the output ethernet type should
* be phase 1 or 2. We have the interface that we'll be sending
* the aarp out. We need to find an AppleTalk network on that
* interface with the same address as we're looking for. If the
* net is phase 2, generate an 802.2 and SNAP header.
*/
if ((aa = at_ifawithnet( sat )) == NULL) {
m_freem( m );
return;
}
eh = (struct ether_header *)sa.sa_data;
if ( aa->aa_flags & AFA_PHASE2 ) {
bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
sizeof( eh->ether_dhost ));
eh->ether_type = htons(sizeof(struct llc) + sizeof(struct ether_aarp));
M_PREPEND( m, sizeof( struct llc ), M_TRYWAIT );
llc = mtod( m, struct llc *);
llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
llc->llc_control = LLC_UI;
bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
llc->llc_ether_type = htons( ETHERTYPE_AARP );
bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
sizeof( ea->aarp_spnet ));
bcopy( &sat->sat_addr.s_net, ea->aarp_tpnet,
sizeof( ea->aarp_tpnet ));
ea->aarp_spnode = AA_SAT( aa )->sat_addr.s_node;
ea->aarp_tpnode = sat->sat_addr.s_node;
} else {
static int
at_pcbsetaddr(struct ddpcb *ddp, struct sockaddr *addr, struct proc *p)
{
struct sockaddr_at lsat, *sat;
struct at_ifaddr *aa;
struct ddpcb *ddpp;
if ( ddp->ddp_lsat.sat_port != ATADDR_ANYPORT ) { /* shouldn't be bound */
return( EINVAL );
}
if (addr != 0) { /* validate passed address */
sat = (struct sockaddr_at *)addr;
if (sat->sat_family != AF_APPLETALK) {
return(EAFNOSUPPORT);
}
if ( sat->sat_addr.s_node != ATADDR_ANYNODE ||
sat->sat_addr.s_net != ATADDR_ANYNET ) {
for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
if (( sat->sat_addr.s_net == AA_SAT( aa )->sat_addr.s_net ) &&
( sat->sat_addr.s_node == AA_SAT( aa )->sat_addr.s_node )) {
break;
}
}
if ( !aa ) {
return( EADDRNOTAVAIL );
}
}
if ( sat->sat_port != ATADDR_ANYPORT ) {
if ( sat->sat_port < ATPORT_FIRST ||
sat->sat_port >= ATPORT_LAST ) {
return( EINVAL );
}
if ( sat->sat_port < ATPORT_RESERVED &&
suser(p) ) {
return( EACCES );
}
}
} else {
bzero( (caddr_t)&lsat, sizeof( struct sockaddr_at ));
lsat.sat_len = sizeof(struct sockaddr_at);
lsat.sat_addr.s_node = ATADDR_ANYNODE;
lsat.sat_addr.s_net = ATADDR_ANYNET;
lsat.sat_family = AF_APPLETALK;
sat = &lsat;
}
if ( sat->sat_addr.s_node == ATADDR_ANYNODE &&
sat->sat_addr.s_net == ATADDR_ANYNET ) {
if ( at_ifaddr == NULL ) {
return( EADDRNOTAVAIL );
}
sat->sat_addr = AA_SAT( at_ifaddr )->sat_addr;
}
ddp->ddp_lsat = *sat;
/*
* Choose port.
*/
if ( sat->sat_port == ATADDR_ANYPORT ) {
for ( sat->sat_port = ATPORT_RESERVED;
sat->sat_port < ATPORT_LAST; sat->sat_port++ ) {
if ( ddp_ports[ sat->sat_port - 1 ] == 0 ) {
break;
}
}
if ( sat->sat_port == ATPORT_LAST ) {
return( EADDRNOTAVAIL );
}
ddp->ddp_lsat.sat_port = sat->sat_port;
ddp_ports[ sat->sat_port - 1 ] = ddp;
} else {
for ( ddpp = ddp_ports[ sat->sat_port - 1 ]; ddpp;
ddpp = ddpp->ddp_pnext ) {
if ( ddpp->ddp_lsat.sat_addr.s_net == sat->sat_addr.s_net &&
ddpp->ddp_lsat.sat_addr.s_node == sat->sat_addr.s_node ) {
break;
}
}
if ( ddpp != NULL ) {
return( EADDRINUSE );
}
ddp->ddp_pnext = ddp_ports[ sat->sat_port - 1 ];
ddp_ports[ sat->sat_port - 1 ] = ddp;
if ( ddp->ddp_pnext ) {
ddp->ddp_pnext->ddp_pprev = ddp;
}
}
return( 0 );
}
/*
* given an at_ifaddr,a sockaddr_at and an ifp,
* bang them all together at high speed and see what happens
*/
static int
at_ifinit(struct ifnet *ifp, struct at_ifaddr *aa, struct sockaddr_at *sat)
{
struct netrange nr, onr;
struct sockaddr_at oldaddr;
int error = 0, i, j;
int netinc, nodeinc, nnets;
u_short net;
crit_enter();
/*
* save the old addresses in the at_ifaddr just in case we need them.
*/
oldaddr = aa->aa_addr;
onr.nr_firstnet = aa->aa_firstnet;
onr.nr_lastnet = aa->aa_lastnet;
/*
* take the address supplied as an argument, and add it to the
* at_ifnet (also given). Remember ing to update
* those parts of the at_ifaddr that need special processing
*/
bzero( AA_SAT( aa ), sizeof( struct sockaddr_at ));
bcopy( sat->sat_zero, &nr, sizeof( struct netrange ));
bcopy( sat->sat_zero, AA_SAT( aa )->sat_zero, sizeof( struct netrange ));
nnets = ntohs( nr.nr_lastnet ) - ntohs( nr.nr_firstnet ) + 1;
aa->aa_firstnet = nr.nr_firstnet;
aa->aa_lastnet = nr.nr_lastnet;
/* XXX ALC */
#if 0
kprintf("at_ifinit: %s: %u.%u range %u-%u phase %d\n",
ifp->if_name,
ntohs(sat->sat_addr.s_net), sat->sat_addr.s_node,
ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet),
(aa->aa_flags & AFA_PHASE2) ? 2 : 1);
#endif
/*
* We could eliminate the need for a second phase 1 probe (post
* autoconf) if we check whether we're resetting the node. Note
* that phase 1 probes use only nodes, not net.node pairs. Under
* phase 2, both the net and node must be the same.
*/
if ( ifp->if_flags & IFF_LOOPBACK ) {
AA_SAT( aa )->sat_len = sat->sat_len;
AA_SAT( aa )->sat_family = AF_APPLETALK;
AA_SAT( aa )->sat_addr.s_net = sat->sat_addr.s_net;
AA_SAT( aa )->sat_addr.s_node = sat->sat_addr.s_node;
#if 0
} else if ( fp->if_flags & IFF_POINTOPOINT) {
/* unimplemented */
/*
* we'd have to copy the dstaddr field over from the sat
* but it's not clear that it would contain the right info..
*/
#endif
} else {
/*
* We are a normal (probably ethernet) interface.
* apply the new address to the interface structures etc.
* We will probe this address on the net first, before
* applying it to ensure that it is free.. If it is not, then
* we will try a number of other randomly generated addresses
* in this net and then increment the net. etc.etc. until
* we find an unused address.
*/
aa->aa_flags |= AFA_PROBING; /* if not loopback we Must probe? */
AA_SAT( aa )->sat_len = sizeof(struct sockaddr_at);
AA_SAT( aa )->sat_family = AF_APPLETALK;
if ( aa->aa_flags & AFA_PHASE2 ) {
if ( sat->sat_addr.s_net == ATADDR_ANYNET ) {
/*
* If we are phase 2, and the net was not specified
* then we select a random net within the supplied netrange.
* XXX use /dev/random?
*/
if ( nnets != 1 ) {
net = ntohs( nr.nr_firstnet ) + time_second % ( nnets - 1 );
} else {
net = ntohs( nr.nr_firstnet );
}
} else {
/*
* if a net was supplied, then check that it is within
* the netrange. If it is not then replace the old values
* and return an error
*/
if ( ntohs( sat->sat_addr.s_net ) < ntohs( nr.nr_firstnet ) ||
ntohs( sat->sat_addr.s_net ) > ntohs( nr.nr_lastnet )) {
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
crit_exit();
return( EINVAL );
}
/*
* otherwise just use the new net number..
*/
net = ntohs( sat->sat_addr.s_net );
}
} else {
/*
* we must be phase one, so just use whatever we were given.
* I guess it really isn't going to be used... RIGHT?
*/
net = ntohs( sat->sat_addr.s_net );
}
/*
* set the node part of the address into the ifaddr.
* If it's not specified, be random about it...
* XXX use /dev/random?
*/
if ( sat->sat_addr.s_node == ATADDR_ANYNODE ) {
AA_SAT( aa )->sat_addr.s_node = time_second;
} else {
AA_SAT( aa )->sat_addr.s_node = sat->sat_addr.s_node;
}
/*
* Copy the phase.
*/
AA_SAT( aa )->sat_range.r_netrange.nr_phase
= ((aa->aa_flags & AFA_PHASE2) ? 2:1);
/*
* step through the nets in the range
* starting at the (possibly random) start point.
*/
for ( i = nnets, netinc = 1; i > 0; net = ntohs( nr.nr_firstnet ) +
(( net - ntohs( nr.nr_firstnet ) + netinc ) % nnets ), i-- ) {
AA_SAT( aa )->sat_addr.s_net = htons( net );
/*
* using a rather strange stepping method,
* stagger through the possible node addresses
* Once again, starting at the (possibly random)
* initial node address.
*/
for ( j = 0, nodeinc = time_second | 1; j < 256;
j++, AA_SAT( aa )->sat_addr.s_node += nodeinc ) {
if ( AA_SAT( aa )->sat_addr.s_node > 253 ||
AA_SAT( aa )->sat_addr.s_node < 1 ) {
continue;
}
aa->aa_probcnt = 10;
/*
* start off the probes as an asynchronous activity.
* though why wait 200mSec?
*/
callout_reset(&aa->aa_ch, hz / 5, aarpprobe, ifp);
if ( tsleep( aa, PCATCH, "at_ifinit", 0 )) {
/*
* theoretically we shouldn't time out here
* so if we returned with an error..
*/
kprintf( "at_ifinit: why did this happen?!\n" );
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
crit_exit();
return( EINTR );
}
/*
* The async activity should have woken us up.
* We need to see if it was successful in finding
* a free spot, or if we need to iterate to the next
* address to try.
*/
if (( aa->aa_flags & AFA_PROBING ) == 0 ) {
break;
}
}
/*
* of course we need to break out through two loops...
*/
if (( aa->aa_flags & AFA_PROBING ) == 0 ) {
break;
}
/* reset node for next network */
AA_SAT( aa )->sat_addr.s_node = time_second;
}
/*
* if we are still trying to probe, then we have finished all
* the possible addresses, so we need to give up
*/
if ( aa->aa_flags & AFA_PROBING ) {
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
crit_exit();
return( EADDRINUSE );
}
}
/*
* Now that we have selected an address, we need to tell the interface
* about it, just in case it needs to adjust something.
*/
ifnet_serialize_all(ifp);
if (ifp->if_ioctl &&
(error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)aa, NULL))
) {
/*
* of course this could mean that it objects violently
* so if it does, we back out again..
*/
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
ifnet_deserialize_all(ifp);
crit_exit();
return( error );
}
ifnet_deserialize_all(ifp);
/*
* set up the netmask part of the at_ifaddr
* and point the appropriate pointer in the ifaddr to it.
* probably pointless, but what the heck.. XXX
*/
bzero(&aa->aa_netmask, sizeof(aa->aa_netmask));
aa->aa_netmask.sat_len = sizeof(struct sockaddr_at);
aa->aa_netmask.sat_family = AF_APPLETALK;
aa->aa_netmask.sat_addr.s_net = 0xffff;
aa->aa_netmask.sat_addr.s_node = 0;
aa->aa_ifa.ifa_netmask =(struct sockaddr *) &(aa->aa_netmask); /* XXX */
/*
* Initialize broadcast (or remote p2p) address
*/
bzero(&aa->aa_broadaddr, sizeof(aa->aa_broadaddr));
aa->aa_broadaddr.sat_len = sizeof(struct sockaddr_at);
aa->aa_broadaddr.sat_family = AF_APPLETALK;
aa->aa_ifa.ifa_metric = ifp->if_metric;
if (ifp->if_flags & IFF_BROADCAST) {
aa->aa_broadaddr.sat_addr.s_net = htons(0);
aa->aa_broadaddr.sat_addr.s_node = 0xff;
aa->aa_ifa.ifa_broadaddr = (struct sockaddr *) &aa->aa_broadaddr;
/* add the range of routes needed */
error = aa_dorangeroute(&aa->aa_ifa,
ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet), RTM_ADD );
}
else if (ifp->if_flags & IFF_POINTOPOINT) {
struct at_addr rtaddr, rtmask;
bzero(&rtaddr, sizeof(rtaddr));
bzero(&rtmask, sizeof(rtmask));
/* fill in the far end if we know it here XXX */
aa->aa_ifa.ifa_dstaddr = (struct sockaddr *) &aa->aa_dstaddr;
error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
}
else if ( ifp->if_flags & IFF_LOOPBACK ) {
struct at_addr rtaddr, rtmask;
bzero(&rtaddr, sizeof(rtaddr));
bzero(&rtmask, sizeof(rtmask));
rtaddr.s_net = AA_SAT( aa )->sat_addr.s_net;
rtaddr.s_node = AA_SAT( aa )->sat_addr.s_node;
rtmask.s_net = 0xffff;
rtmask.s_node = 0x0; /* XXX should not be so.. should be HOST route */
error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
}
/*
* set the address of our "check if this addr is ours" routine.
*/
aa->aa_ifa.ifa_claim_addr = aa_claim_addr;
/*
* of course if we can't add these routes we back out, but it's getting
* risky by now XXX
*/
if ( error ) {
at_scrub( ifp, aa );
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
crit_exit();
return( error );
}
/*
* note that the address has a route associated with it....
*/
aa->aa_ifa.ifa_flags |= IFA_ROUTE;
aa->aa_flags |= AFA_ROUTE;
crit_exit();
return( 0 );
}