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|
/* $OpenBSD: at_control.c,v 1.6 2003/11/07 10:16:46 jmc Exp $ */
/*
* Copyright (c) 1990,1991 Regents of The University of Michigan.
* All Rights Reserved.
*/
/*
* The following is the contents of the COPYRIGHT file from the
* netatalk-1.4a2 distribution, from which this file is derived.
*/
/*
* Copyright (c) 1990,1996 Regents of The University of Michigan.
*
* All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation, and that the name of The University
* of Michigan not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. This software is supplied as is without expressed or
* implied warranties of any kind.
*
* This product includes software developed by the University of
* California, Berkeley and its contributors.
*
* Solaris code is encumbered by the following:
*
* Copyright (C) 1996 by Sun Microsystems Computer Co.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that copyright notice and this permission
* notice appear in supporting documentation. This software is
* provided "as is" without express or implied warranty.
*
* Research Systems Unix Group
* The University of Michigan
* c/o Wesley Craig
* 535 W. William Street
* Ann Arbor, Michigan
* +1-313-764-2278
* netatalk@umich.edu
*/
/*
* None of the Solaris code mentioned is included in OpenBSD.
* This code also relies heavily on previous effort in FreeBSD and NetBSD.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#include <sys/timeout.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#undef s_net
#include <netinet/if_ether.h>
#include <net/if_llc.h>
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#include <netatalk/aarp.h>
#include <netatalk/phase2.h>
#include <netatalk/at_extern.h>
#include <dev/rndvar.h>
int at_control( u_long, caddr_t, struct ifnet *, struct proc * );
static int at_scrub( struct ifnet *, struct at_ifaddr * );
static int at_ifinit( struct ifnet *, struct at_ifaddr *,
struct sockaddr_at * );
int at_broadcast( struct sockaddr_at * );
static int aa_dorangeroute(struct ifaddr *, u_int, u_int, int);
static int aa_addsingleroute(struct ifaddr *, struct at_addr *,
struct at_addr *);
static int aa_delsingleroute(struct ifaddr *, struct at_addr *,
struct at_addr *);
static int aa_dosingleroute(struct ifaddr *, struct at_addr *,
struct at_addr *, int, int );
# define sateqaddr(a,b) ((a)->sat_len == (b)->sat_len && \
(a)->sat_family == (b)->sat_family && \
(a)->sat_addr.s_net == (b)->sat_addr.s_net && \
(a)->sat_addr.s_node == (b)->sat_addr.s_node )
extern struct timeout aarpprobe_timeout;
int
at_control( cmd, data, ifp, p )
u_long cmd;
caddr_t data;
struct ifnet *ifp;
struct proc *p;
{
struct ifreq *ifr = (struct ifreq *)data;
struct sockaddr_at *sat;
struct netrange *nr;
struct at_aliasreq *ifra = (struct at_aliasreq *)data;
struct at_ifaddr *aa0;
struct at_ifaddr *aa = 0;
struct ifaddr *ifa, *ifa0;
if ( ifp ) {
for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
if ( aa->aa_ifp == ifp ) break;
}
}
switch ( cmd ) {
case SIOCAIFADDR:
case SIOCDIFADDR:
if ( ifra->ifra_addr.sat_family == AF_APPLETALK ) {
for ( ; aa; aa = aa->aa_next ) {
if ( aa->aa_ifp == ifp &&
sateqaddr( &aa->aa_addr, &ifra->ifra_addr )) {
break;
}
}
}
if ( cmd == SIOCDIFADDR && aa == 0 ) {
return( EADDRNOTAVAIL );
}
/*FALLTHROUGH*/
case SIOCSIFADDR:
/*
* What a great idea this is: Let's reverse the meaning of
* the return...
*/
if ( suser( p, 0 )) {
return( EPERM );
}
sat = satosat( &ifr->ifr_addr );
nr = (struct netrange *)sat->sat_zero;
if ( nr->nr_phase == 1 ) {
for ( ; aa; aa = aa->aa_next ) {
if ( aa->aa_ifp == ifp &&
( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
break;
}
}
} else { /* default to phase 2 */
for ( ; aa; aa = aa->aa_next ) {
if ( aa->aa_ifp == ifp && ( aa->aa_flags & AFA_PHASE2 )) {
break;
}
}
}
if ( ifp == 0 )
panic( "at_control" );
if ( aa == (struct at_ifaddr *) 0 ) {
aa0 = malloc(sizeof(struct at_ifaddr), M_IFADDR, M_WAITOK);
bzero(aa0, sizeof(struct at_ifaddr));
if (( aa = at_ifaddr ) != NULL ) {
/*
* Don't let the loopback be first, since the first
* address is the machine's default address for
* binding.
*/
if ( at_ifaddr->aa_ifp->if_flags & IFF_LOOPBACK ) {
aa = aa0;
aa->aa_next = at_ifaddr;
at_ifaddr = aa;
} else {
for ( ; aa->aa_next; aa = aa->aa_next )
;
aa->aa_next = aa0;
}
} else {
at_ifaddr = aa0;
}
aa = aa0;
if (( ifa = ifp->if_addrlist.tqh_first ) != NULL ) {
for ( ; ifa->ifa_list.tqe_next; ifa = ifa->ifa_list.tqe_next )
;
ifa->ifa_list.tqe_next = (struct ifaddr *)aa;
} else {
ifp->if_addrlist.tqh_first = (struct ifaddr *)aa;
}
/* FreeBSD found this. Whew */
aa->aa_ifa.ifa_refcnt++;
aa->aa_ifa.ifa_addr = (struct sockaddr *)&aa->aa_addr;
aa->aa_ifa.ifa_dstaddr = (struct sockaddr *)&aa->aa_addr;
aa->aa_ifa.ifa_netmask = (struct sockaddr *)&aa->aa_netmask;
/*
* Set/clear the phase 2 bit.
*/
if ( nr->nr_phase == 1 ) {
aa->aa_flags &= ~AFA_PHASE2;
} else {
aa->aa_flags |= AFA_PHASE2;
}
aa->aa_ifp = ifp;
} else {
at_scrub( ifp, aa );
}
break;
case SIOCGIFADDR :
sat = satosat( &ifr->ifr_addr );
nr = (struct netrange *)sat->sat_zero;
if ( nr->nr_phase == 1 ) {
for ( ; aa; aa = aa->aa_next ) {
if ( aa->aa_ifp == ifp &&
( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
break;
}
}
} else { /* default to phase 2 */
for ( ; aa; aa = aa->aa_next ) {
if ( aa->aa_ifp == ifp && ( aa->aa_flags & AFA_PHASE2 )) {
break;
}
}
}
if ( aa == (struct at_ifaddr *) 0 )
return( EADDRNOTAVAIL );
break;
}
switch ( cmd ) {
case SIOCGIFADDR:
*(struct sockaddr_at *)&ifr->ifr_addr = aa->aa_addr;
/* from FreeBSD : some cleanups about netranges */
((struct netrange *)&sat->sat_zero)->nr_phase
= (aa->aa_flags & AFA_PHASE2) ? 2 : 1;
((struct netrange *)&sat->sat_zero)->nr_firstnet = aa->aa_firstnet;
((struct netrange *)&sat->sat_zero)->nr_lastnet = aa->aa_lastnet;
break;
case SIOCSIFADDR:
return( at_ifinit( ifp, aa, (struct sockaddr_at *)&ifr->ifr_addr ));
case SIOCAIFADDR:
if ( sateqaddr( &ifra->ifra_addr, &aa->aa_addr )) {
return( 0 );
}
return( at_ifinit( ifp, aa, (struct sockaddr_at *)&ifr->ifr_addr ));
case SIOCDIFADDR:
at_scrub( ifp, aa );
ifa0 = (struct ifaddr *)aa;
if (( ifa = ifp->if_addrlist.tqh_first ) == ifa0 ) {
ifp->if_addrlist.tqh_first = ifa->ifa_list.tqe_next;
} else {
while ( ifa->ifa_list.tqe_next &&
( ifa->ifa_list.tqe_next != ifa0 )) {
ifa = ifa->ifa_list.tqe_next;
}
if ( ifa->ifa_list.tqe_next ) {
ifa->ifa_list.tqe_next = ifa0->ifa_list.tqe_next;
} else {
panic( "at_control" );
}
}
/* FreeBSD */
IFAFREE(ifa0);
aa0 = aa;
if ( aa0 == ( aa = at_ifaddr )) {
at_ifaddr = aa->aa_next;
} else {
while ( aa->aa_next && ( aa->aa_next != aa0 )) {
aa = aa->aa_next;
}
if ( aa->aa_next ) {
aa->aa_next = aa0->aa_next;
} else {
panic( "at_control" );
}
}
/* FreeBSD */
IFAFREE(ifa0);
break;
default:
if ( ifp == 0 || ifp->if_ioctl == 0 )
return( EOPNOTSUPP );
return( (*ifp->if_ioctl)( ifp, cmd, data ));
}
return( 0 );
}
/* replaced this routine with the one from FreeBSD */
static int
at_scrub( ifp, aa )
struct ifnet *ifp;
struct at_ifaddr *aa;
{
int error;
if ( aa->aa_flags & AFA_ROUTE ) {
if (ifp->if_flags & IFF_LOOPBACK) {
if ((error = aa_delsingleroute(&aa->aa_ifa,
&aa->aa_addr.sat_addr,
&aa->aa_netmask.sat_addr))) {
return( error );
}
} else if (ifp->if_flags & IFF_POINTOPOINT) {
if ((error = rtinit( &aa->aa_ifa, RTM_DELETE, RTF_HOST)) != 0)
return( error );
} else if (ifp->if_flags & IFF_BROADCAST) {
error = aa_dorangeroute(&aa->aa_ifa,
ntohs(aa->aa_firstnet),
ntohs(aa->aa_lastnet),
RTM_DELETE );
}
aa->aa_ifa.ifa_flags &= ~IFA_ROUTE;
aa->aa_flags &= ~AFA_ROUTE;
}
return( 0 );
}
static int
at_ifinit( ifp, aa, sat )
struct ifnet *ifp;
struct at_ifaddr *aa;
struct sockaddr_at *sat;
{
struct netrange nr, onr;
struct sockaddr_at oldaddr;
int s = splimp(), error = 0, i, j, netinc, nodeinc, nnets;
u_int16_t net;
oldaddr = aa->aa_addr;
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;
onr.nr_firstnet = aa->aa_firstnet;
onr.nr_lastnet = aa->aa_lastnet;
aa->aa_firstnet = nr.nr_firstnet;
aa->aa_lastnet = nr.nr_lastnet;
/*
* 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;
} else {
aa->aa_flags |= AFA_PROBING;
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 ( nnets != 1 ) {
net = ntohs( nr.nr_firstnet ) +
arc4random() % ( nnets - 1 );
} else {
net = ntohs( nr.nr_firstnet );
}
} else {
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;
splx(s);
return( EINVAL );
}
net = ntohs( sat->sat_addr.s_net );
}
} else {
net = ntohs( sat->sat_addr.s_net );
}
if ( sat->sat_addr.s_node == ATADDR_ANYNODE ) {
AA_SAT( aa )->sat_addr.s_node = arc4random();
} else {
AA_SAT( aa )->sat_addr.s_node = sat->sat_addr.s_node;
}
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 );
for ( j = 0, nodeinc = arc4random() | 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;
timeout_set(&aarpprobe_timeout, aarpprobe, ifp);
/* XXX don't use hz so badly */
timeout_add(&aarpprobe_timeout, hz / 5);
if ( tsleep( aa, PPAUSE|PCATCH, "at_ifinit", 0 )) {
printf( "at_ifinit why did this happen?!\n" );
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
splx( s );
return( EINTR );
}
if (( aa->aa_flags & AFA_PROBING ) == 0 ) {
break;
}
}
if (( aa->aa_flags & AFA_PROBING ) == 0 ) {
break;
}
/* reset node for next network */
AA_SAT( aa )->sat_addr.s_node = time.tv_sec;
}
if ( aa->aa_flags & AFA_PROBING ) {
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
splx( s );
return( EADDRINUSE );
}
}
if ( ifp->if_ioctl &&
( error = (*ifp->if_ioctl)( ifp, SIOCSIFADDR, (caddr_t) aa ))) {
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
splx( s );
return( error );
}
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;
/* XXX From FreeBSD. Why does it do this? */
aa->aa_ifa.ifa_netmask =(struct sockaddr *) &(aa->aa_netmask);
/* This block came from FreeBSD too */
/*
* 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_broadaddr;
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);
}
if ( error ) {
at_scrub( ifp, aa );
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
splx( s );
return( error );
}
aa->aa_ifa.ifa_flags |= IFA_ROUTE;
aa->aa_flags |= AFA_ROUTE;
splx( s );
return( 0 );
}
int
at_broadcast( sat )
struct sockaddr_at *sat;
{
struct at_ifaddr *aa;
if ( sat->sat_addr.s_node != ATADDR_BCAST ) {
return( 0 );
}
if ( sat->sat_addr.s_net == ATADDR_ANYNET ) {
return( 1 );
} else {
for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
if (( aa->aa_ifp->if_flags & IFF_BROADCAST ) &&
( ntohs( sat->sat_addr.s_net ) >= ntohs( aa->aa_firstnet ) &&
ntohs( sat->sat_addr.s_net ) <= ntohs( aa->aa_lastnet ))) {
return( 1 );
}
}
}
return( 0 );
}
/* Yet another bunch of routines from FreeBSD. Those guys are good */
/*
* aa_dorangeroute()
*
* Add a route for a range of networks from bot to top - 1.
* Algorithm:
*
* Split the range into two subranges such that the middle
* of the two ranges is the point where the highest bit of difference
* between the two addresses, makes it's transition
* Each of the upper and lower ranges might not exist, or might be
* representable by 1 or more netmasks. In addition, if both
* ranges can be represented by the same netmask, then they can be merged
* by using the next higher netmask..
*/
static int
aa_dorangeroute(struct ifaddr *ifa, u_int bot, u_int top, int cmd)
{
u_int mask1;
struct at_addr addr;
struct at_addr mask;
int error;
/*
* slight sanity check
*/
if (bot > top) return (EINVAL);
addr.s_node = 0;
mask.s_node = 0;
/*
* just start out with the lowest boundary
* and keep extending the mask till it's too big.
*/
while (bot <= top) {
mask1 = 1;
while ((( bot & ~mask1) >= bot)
&& (( bot | mask1) <= top)) {
mask1 <<= 1;
mask1 |= 1;
}
mask1 >>= 1;
mask.s_net = htons(~mask1);
addr.s_net = htons(bot);
if(cmd == RTM_ADD) {
error = aa_addsingleroute(ifa,&addr,&mask);
if (error) {
/* XXX clean up? */
return (error);
}
} else {
error = aa_delsingleroute(ifa,&addr,&mask);
}
bot = (bot | mask1) + 1;
}
return 0;
}
static int
aa_addsingleroute(struct ifaddr *ifa,
struct at_addr *addr, struct at_addr *mask)
{
int error;
#if 0
printf("aa_addsingleroute: %x.%x mask %x.%x ...\n",
ntohs(addr->s_net), addr->s_node,
ntohs(mask->s_net), mask->s_node);
#endif
error = aa_dosingleroute(ifa, addr, mask, RTM_ADD, RTF_UP);
if (error)
printf("aa_addsingleroute: error %d\n", error);
return(error);
}
static int
aa_delsingleroute(struct ifaddr *ifa,
struct at_addr *addr, struct at_addr *mask)
{
int error;
error = aa_dosingleroute(ifa, addr, mask, RTM_DELETE, 0);
if (error)
printf("aa_delsingleroute: error %d\n", error);
return(error);
}
static int
aa_dosingleroute(struct ifaddr *ifa,
struct at_addr *at_addr, struct at_addr *at_mask, int cmd, int flags)
{
struct sockaddr_at addr, mask;
bzero(&addr, sizeof(addr));
bzero(&mask, sizeof(mask));
addr.sat_family = AF_APPLETALK;
addr.sat_len = sizeof(struct sockaddr_at);
addr.sat_addr.s_net = at_addr->s_net;
addr.sat_addr.s_node = at_addr->s_node;
mask.sat_family = AF_APPLETALK;
mask.sat_len = sizeof(struct sockaddr_at);
mask.sat_addr.s_net = at_mask->s_net;
mask.sat_addr.s_node = at_mask->s_node;
if (at_mask->s_node)
flags |= RTF_HOST;
return(rtrequest(cmd, (struct sockaddr *) &addr,
(flags & RTF_HOST)?(ifa->ifa_dstaddr):(ifa->ifa_addr),
(struct sockaddr *) &mask, flags, NULL));
}
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