[apple/xnu.git] / bsd / netat / aurp_aurpd.c

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 *	Copyright (c) 1996 Apple Computer, Inc. 
 *
 *		Created April 25, 1996, by Justin C. Walker
 *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
 *
 *	File: aurpd.c
 */

/*
 * Kernel process to implement the AURP daemon:
 *  manage tunnels to remote AURP servers across IP networks
 */

#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <machine/spl.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/filedesc.h>
#include <sys/fcntl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/uio_internal.h>
#include <kern/locks.h>
#include <netinet/in.h>
#include <net/if.h>

#include <netat/sysglue.h>
#include <netat/appletalk.h>
#include <netat/at_var.h>
#include <netat/routing_tables.h>
#include <netat/at_pcb.h>
#include <netat/aurp.h>
#include <netat/debug.h>

#define M_RCVBUF (64 * 1024)
#define M_SNDBUF (64 * 1024)

extern lck_mtx_t * atalk_mutex;

static int ip_to_atalk(struct sockaddr_in *fp, register gbuf_t *p_mbuf);
static int aurp_bindrp(struct socket *so);

struct aurp_global_t aurp_global;

/*
 * Initialize the aurp pipe -
 * -Create, initialize, and start the aurpd kernel process; we need
 *  a process to permit queueing between the socket and the stream,
 *  which is necessary for orderly access to the socket structure.
 * -The user process (aurpd) is there to 'build' the AURP
 *  stream, act as a 'logging agent' (:-}), and hold open the stream
 *  during its use.
 * -Data and AURP packets from the DDP stream will be fed into the
 *  UDP tunnel (AURPsend())
 * -Data and AURP packets from the UDP tunnel will be fed into the
 *  DDP stream (ip_to_atalk(), via the kernel process).
 */
int
aurpd_start()
{
	register int error;
	register struct socket *so;
	struct mbuf *m;
	int maxbuf;
	struct sockopt sopt;

	if (suser(kauth_cred_get(), 0) != 0 )
		return(EPERM);

	/*
	 * Set up state prior to starting kernel process so we can back out
	 *  (error return) if something goes wrong.
	 */
	bzero((char *)&aurp_global.tunnel, sizeof(aurp_global.tunnel));
	/*lock_alloc(&aurp_global.glock, LOCK_ALLOC_PIN, AURP_EVNT_LOCK, -1);*/
	ATLOCKINIT(aurp_global.glock);
	ATEVENTINIT(aurp_global.event_anchor);

	/* open udp socket */
	if (aurp_global.udp_port == 0)
		aurp_global.udp_port = AURP_SOCKNUM;
	error = socreate(AF_INET, &aurp_global.tunnel, SOCK_DGRAM,
			 IPPROTO_UDP);
	if (error)
	{	dPrintf(D_M_AURP, D_L_FATAL, ("AURP: Can't get socket (%d)\n",
			error));
		return(error);
	}

	so = aurp_global.tunnel;

	if ((error = aurp_bindrp(so)) != 0)
	{	dPrintf(D_M_AURP, D_L_FATAL,
			("AURP: Can't bind to port %d (error %d)\n",
			aurp_global.udp_port, error));
		soclose(so);
		return(error);
	}

	sblock(&so->so_rcv, M_WAIT);
	sblock(&so->so_snd, M_WAIT);

	/*
	 * Set socket Receive buffer size
	 */
	m = m_get(M_WAIT, MT_SOOPTS);
	if (m == NULL) {
		error = ENOBUFS;
		goto out;
	} else {
		maxbuf = M_RCVBUF;
		sopt.sopt_val     = CAST_USER_ADDR_T(&maxbuf);
		sopt.sopt_valsize = sizeof(maxbuf);
		sopt.sopt_level   = SOL_SOCKET;
		sopt.sopt_name    = SO_RCVBUF;
		sopt.sopt_dir     = SOPT_SET;
		sopt.sopt_p		  = NULL;
		if ((error = sosetopt(so, &sopt)) != 0)
			goto out;
	}

	/*
	 * Set socket Send buffer size
	 */
	m = m_get(M_WAIT, MT_SOOPTS);
	if (m == NULL) {
		error = ENOBUFS;
		goto out;
	} else {

		maxbuf = M_SNDBUF;
		sopt.sopt_val     = CAST_USER_ADDR_T(&maxbuf);
		sopt.sopt_valsize = sizeof(maxbuf);
		sopt.sopt_level   = SOL_SOCKET;
		sopt.sopt_name    = SO_SNDBUF;
		sopt.sopt_dir     = SOPT_SET;
		sopt.sopt_p		  = NULL;
		if ((error = sosetopt(so, &sopt)) != 0)
			goto out;
	}

	so->so_upcall = aurp_wakeup;
	so->so_upcallarg = (caddr_t)AE_UDPIP; /* Yuck */
	so->so_state |= SS_NBIO;
	so->so_rcv.sb_flags |=(SB_SEL|SB_NOINTR);
	so->so_snd.sb_flags |=(SB_SEL|SB_NOINTR);

out:
	sbunlock(&so->so_snd, 0);
	sbunlock(&so->so_rcv, 0);

	return(error);
}

int
AURPgetmsg(err)
	int *err;
{	register struct socket *so;
	register int events;

	so = aurp_global.tunnel;
	*err = 0;

	for (;;)
	{	gbuf_t *from, *p_mbuf;
		int flags = MSG_DONTWAIT;
		uio_t auio;
		char uio_buf[ UIO_SIZEOF(0) ];

		/*
		 * Wait for a package to arrive.  This will be from the
		 * IP side - sowakeup() calls aurp_wakeup()
		 *	     when a packet arrives
		 */

		ATDISABLE(s, aurp_global.glock);
		events = aurp_global.event;
		if (((*err == 0) || (*err == EWOULDBLOCK)) && events == 0)
		  {
			lck_mtx_assert(atalk_mutex, LCK_MTX_ASSERT_OWNED);
		    *err = msleep(&aurp_global.event_anchor, atalk_mutex, PSOCK | PCATCH, "AURPgetmsg", 0);
		    events = aurp_global.event;
		    aurp_global.event = 0;
		  }	
		ATENABLE(s, aurp_global.glock);	 

		/*
		 * Shut down if we have the AE_SHUTDOWN event or if we got
		 * a system error other than EWOULDBLOCK, such as EINTR.
		 */
		if (((*err != EWOULDBLOCK) && (*err != 0)) || events & AE_SHUTDOWN)
		  {	
		    dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
			("AURPgetmsg: AE_SHUTDOWN detected--starting shutdown sequence\n"));
		    aurp_global.shutdown = 1;
		    while (aurp_global.running)
			;
		    /*lock_free(&aurp_global.glock);*/
		    aurp_global.tunnel = 0;
		    aurp_global.event = 0;
		    aurp_global.shutdown = 0;
		    soclose(so);
		    if (*err == 0)
		    *err = ESHUTDOWN;
		    dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
			("AURPgetmsg: shutdown completed\n"));
		    return -1;
		  }


		/*
		 * Set up the nominal uio structure -
		 *  give it no iov's, point off to non-existant user space,
		 *  but make sure the 'resid' count means somehting.
		 */
		auio = uio_createwithbuffer(0, 0, UIO_SYSSPACE, UIO_READ, 
								  &uio_buf[0], sizeof(uio_buf));

		/* Keep up an even flow... */
		for (;;)
		{
/*
 * This should be large enough to encompass a full DDP packet plus
 *  domain header.
 */
#define A_LARGE_SIZE 700

			flags = MSG_DONTWAIT;
			uio_setresid(auio, A_LARGE_SIZE);
			*err = soreceive(so, (struct sockaddr **)&from, auio, &p_mbuf, 0, &flags);
			dPrintf(D_M_AURP, D_L_VERBOSE,
				("AURPgetmsg: soreceive returned %d, aurp_global.event==0x%x\n", *err, events));
			/* soreceive() sets *mp to zero! at start */
			if (p_mbuf)
			        ip_to_atalk((struct sockaddr_in *)from, p_mbuf);
			if (*err || (p_mbuf == NULL)) {
				/*
				 * An error occurred in soreceive(),
				 * so clear the data input event flag
				 * and break out of this inner loop.
				 *
				 * XXX Note that clearing AE_UDPIP here could
				 * cause us to lose an AE_UDPIP event that
				 * was posted in aurp_global.event between
				 * the soreceive() above and the code here.
				 * The protocol should recover from this
				 * lost event, though, since the next
				 * request (a tickle, for example) from
				 * the other end of the tunnel will cause
				 * another AE_UDPIP event to be posted,
				 * which will wake us from the sleep at
				 * the top of the outer loop.
				 */
				ATDISABLE(s, aurp_global.glock);
				aurp_global.event &= ~AE_UDPIP;
				ATENABLE(s, aurp_global.glock);
				dPrintf(D_M_AURP, D_L_WARNING, ("AURPgetmsg: spurious soreceive, err==%d, p_mbuf==0x%x\n", *err, (unsigned int) p_mbuf));
			  break;
		}
	}
	}
	return -1;
}

/*
 * Wakeup the sleeping giant - we've put a message on his queue(s).
 * The arg indicates what queue has been updated.
 *
 * This conforms to the so_upcall function pointer member of struct sockbuf.
 */
void aurp_wakeup(__unused struct socket *so, register caddr_t p, __unused int state)
{
	register int bit;

	bit = (int) p;
	ATDISABLE(s, aurp_global.glock);
	aurp_global.event |= bit;
	ATENABLE(s, aurp_global.glock);

	dPrintf(D_M_AURP, D_L_STATE_CHG,
		("aurp_wakeup: bit 0x%x, aurp_global.event now 0x%x\n",
		bit, aurp_global.event));

	wakeup(&aurp_global.event_anchor);
}

/*
 * Try to bind to the specified reserved port.
 * Sort of like sobind(), but no suser() check.
 */
static int
aurp_bindrp(struct socket *so)
{
	struct sockaddr_in sin;
	struct proc *p = current_proc();
	int error;


	bzero(&sin, sizeof(sin));
	sin.sin_family      = AF_INET;
	sin.sin_addr.s_addr = htons(aurp_global.src_addr);
	sin.sin_port        = htons(aurp_global.udp_port);
	sin.sin_len         = sizeof(struct sockaddr_in);

	sblock(&so->so_rcv, M_WAIT);
	sblock(&so->so_snd, M_WAIT);
	so->so_state |= SS_PRIV;
	error = (*so->so_proto->pr_usrreqs->pru_bind)(so, (struct sockaddr *) &sin, p);
	sbunlock(&so->so_snd, 0);
	sbunlock(&so->so_rcv, 0);

	return (error);
}

/*
 * receive from UDP
 * fp is the 'source address' mbuf; p_mbuf is the data mbuf.
 * Use the source address to find the 'node number' (index of the address),
 *  and pass that to the next stage.
 */
int ip_to_atalk(register struct sockaddr_in *rem_addr, register gbuf_t *p_mbuf)
{	
	register aurp_domain_t *domain;
	unsigned char node;


	/* determine the node where the packet came from */
	for (node=1; node <= dst_addr_cnt; node++) {
		if (aurp_global.dst_addr[node] == *(long *)&rem_addr->sin_addr)
			break;
	}
	if (node > dst_addr_cnt) {
		dPrintf(D_M_AURP, D_L_WARNING,
			("AURPrecv: invalid node, %d.%lx\n",
			rem_addr->sin_port,
			rem_addr->sin_addr.s_addr));
		
		gbuf_freem(p_mbuf);
		FREE(rem_addr, M_SONAME);
		return -1;
	}

	/* validate the domain */
	domain = (aurp_domain_t *)gbuf_rptr(p_mbuf);
	if ( (domain->dst_length != IP_LENGTH) ||
	    (domain->dst_authority != IP_AUTHORITY) ||
	    (domain->version != AUD_Version) ||
	    ((domain->type != AUD_Atalk) && (domain->type != AUD_AURP)) ) {
		dPrintf(D_M_AURP, D_L_WARNING,
			("AURPrecv: invalid domain, %d.%lx\n",
			rem_addr->sin_port,
			rem_addr->sin_addr.s_addr));
		
		gbuf_freem(p_mbuf);
		FREE(rem_addr, M_SONAME);
		return -1;
	}

	/* Remove domain header */
	p_mbuf->m_pkthdr.len -= IP_DOMAINSIZE;
	gbuf_rinc(p_mbuf,IP_DOMAINSIZE);
	gbuf_set_type(p_mbuf, MSG_DATA);

	/* forward the packet to the local AppleTalk stack */

	at_insert(p_mbuf, domain->type, node);
	FREE(rem_addr, M_SONAME);
	return 0;
}

/*
 * send to UDP
 * The real work has been done already.	 Here, we just cobble together
 *  a sockaddr for the destination and call sosend().
 */
void
atalk_to_ip(register gbuf_t *m)
{	register aurp_domain_t *domain;
	int error;
	int flags = MSG_DONTWAIT;
	struct sockaddr_in rem_addr;

	m->m_type = MT_HEADER;
	m->m_pkthdr.len = gbuf_msgsize(m);
	m->m_pkthdr.rcvif = 0;

	bzero((char *) &rem_addr, sizeof(rem_addr));
	rem_addr.sin_family = PF_INET;
	rem_addr.sin_port = aurp_global.udp_port;
	rem_addr.sin_len  = sizeof (struct sockaddr_in);
	domain = (aurp_domain_t *)gbuf_rptr(m);
	*(long *) &rem_addr.sin_addr = domain->dst_address;

	ATDISABLE(s, aurp_global.glock);
	aurp_global.running++;
	ATENABLE(s, aurp_global.glock);
	if (aurp_global.shutdown) {
		gbuf_freem(m);
			ATDISABLE(s, aurp_global.glock);
		aurp_global.running--;
		ATENABLE(s, aurp_global.glock);
		dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
			("atalk_to_ip: detected aurp_global.shutdown state\n"));
		return;
	}
	dPrintf(D_M_AURP, D_L_VERBOSE, ("atalk_to_ip: calling sosend\n"));
	error = sosend(aurp_global.tunnel, (struct sockaddr *) &rem_addr, NULL, m, NULL, flags);
	if (error)
	{	/*log error*/
	  dPrintf(D_M_AURP, D_L_ERROR, ("AURP: sosend error (%d)\n",
		  error));
	}

	ATDISABLE(s, aurp_global.glock);
	aurp_global.running--;
	ATENABLE(s, aurp_global.glock);
	return;
}
Commit	Line	Data
1c79356b	1	/*
91447636	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
37839358 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
37839358 A	12	* This Original Code and all software distributed under the License are
37839358 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
37839358 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1996 Apple Computer, Inc.
	24	*
	25	* Created April 25, 1996, by Justin C. Walker
	26	* Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
	27	*
	28	* File: aurpd.c
	29	*/
	30
	31	/*
	32	* Kernel process to implement the AURP daemon:
	33	* manage tunnels to remote AURP servers across IP networks
	34	*/
	35
	36	#include <sys/errno.h>
	37	#include <sys/types.h>
	38	#include <sys/param.h>
	39	#include <machine/spl.h>
	40	#include <sys/systm.h>
	41	#include <sys/kernel.h>
	42	#include <sys/proc.h>
91447636	43	#include <sys/kauth.h>
1c79356b A	44	#include <sys/filedesc.h>
	45	#include <sys/fcntl.h>
	46	#include <sys/mbuf.h>
	47	#include <sys/socket.h>
	48	#include <sys/socketvar.h>
	49	#include <sys/protosw.h>
	50	#include <sys/malloc.h>
	51	#include <sys/proc.h>
91447636 A	52	#include <sys/uio_internal.h>
91447636 A	53	#include <kern/locks.h>
1c79356b A	54	#include <netinet/in.h>
	55	#include <net/if.h>
	56
	57	#include <netat/sysglue.h>
	58	#include <netat/appletalk.h>
	59	#include <netat/at_var.h>
	60	#include <netat/routing_tables.h>
	61	#include <netat/at_pcb.h>
	62	#include <netat/aurp.h>
	63	#include <netat/debug.h>
	64
	65	#define M_RCVBUF (64 * 1024)
	66	#define M_SNDBUF (64 * 1024)
	67
91447636 A	68	extern lck_mtx_t * atalk_mutex;
91447636 A	69
1c79356b A	70	static int ip_to_atalk(struct sockaddr_in fp, register gbuf_t p_mbuf);
	71	static int aurp_bindrp(struct socket *so);
	72
	73	struct aurp_global_t aurp_global;
	74
	75	/*
	76	* Initialize the aurp pipe -
	77	* -Create, initialize, and start the aurpd kernel process; we need
	78	* a process to permit queueing between the socket and the stream,
	79	* which is necessary for orderly access to the socket structure.
	80	* -The user process (aurpd) is there to 'build' the AURP
	81	* stream, act as a 'logging agent' (:-}), and hold open the stream
	82	* during its use.
	83	* -Data and AURP packets from the DDP stream will be fed into the
	84	* UDP tunnel (AURPsend())
	85	* -Data and AURP packets from the UDP tunnel will be fed into the
	86	* DDP stream (ip_to_atalk(), via the kernel process).
	87	*/
	88	int
	89	aurpd_start()
	90	{
	91	register int error;
	92	register struct socket *so;
	93	struct mbuf *m;
	94	int maxbuf;
	95	struct sockopt sopt;
	96
91447636	97	if (suser(kauth_cred_get(), 0) != 0 )
1c79356b A	98	return(EPERM);
	99
	100	/*
	101	* Set up state prior to starting kernel process so we can back out
	102	* (error return) if something goes wrong.
	103	*/
	104	bzero((char *)&aurp_global.tunnel, sizeof(aurp_global.tunnel));
	105	/lock_alloc(&aurp_global.glock, LOCK_ALLOC_PIN, AURP_EVNT_LOCK, -1);/
	106	ATLOCKINIT(aurp_global.glock);
	107	ATEVENTINIT(aurp_global.event_anchor);
	108
	109	/* open udp socket */
	110	if (aurp_global.udp_port == 0)
	111	aurp_global.udp_port = AURP_SOCKNUM;
	112	error = socreate(AF_INET, &aurp_global.tunnel, SOCK_DGRAM,
	113	IPPROTO_UDP);
	114	if (error)
	115	{ dPrintf(D_M_AURP, D_L_FATAL, ("AURP: Can't get socket (%d)\n",
	116	error));
	117	return(error);
	118	}
	119
	120	so = aurp_global.tunnel;
	121
	122	if ((error = aurp_bindrp(so)) != 0)
	123	{ dPrintf(D_M_AURP, D_L_FATAL,
	124	("AURP: Can't bind to port %d (error %d)\n",
	125	aurp_global.udp_port, error));
	126	soclose(so);
	127	return(error);
	128	}
	129
	130	sblock(&so->so_rcv, M_WAIT);
	131	sblock(&so->so_snd, M_WAIT);
	132
	133	/*
	134	* Set socket Receive buffer size
	135	*/
	136	m = m_get(M_WAIT, MT_SOOPTS);
	137	if (m == NULL) {
	138	error = ENOBUFS;
	139	goto out;
	140	} else {
	141	maxbuf = M_RCVBUF;
91447636	142	sopt.sopt_val = CAST_USER_ADDR_T(&maxbuf);
1c79356b A	143	sopt.sopt_valsize = sizeof(maxbuf);
	144	sopt.sopt_level = SOL_SOCKET;
	145	sopt.sopt_name = SO_RCVBUF;
	146	sopt.sopt_dir = SOPT_SET;
0b4e3aa0	147	sopt.sopt_p = NULL;
1c79356b A	148	if ((error = sosetopt(so, &sopt)) != 0)
	149	goto out;
	150	}
	151
	152	/*
	153	* Set socket Send buffer size
	154	*/
	155	m = m_get(M_WAIT, MT_SOOPTS);
	156	if (m == NULL) {
	157	error = ENOBUFS;
	158	goto out;
	159	} else {
	160
	161	maxbuf = M_SNDBUF;
91447636	162	sopt.sopt_val = CAST_USER_ADDR_T(&maxbuf);
1c79356b A	163	sopt.sopt_valsize = sizeof(maxbuf);
	164	sopt.sopt_level = SOL_SOCKET;
	165	sopt.sopt_name = SO_SNDBUF;
	166	sopt.sopt_dir = SOPT_SET;
0b4e3aa0	167	sopt.sopt_p = NULL;
1c79356b A	168	if ((error = sosetopt(so, &sopt)) != 0)
	169	goto out;
	170	}
	171
	172	so->so_upcall = aurp_wakeup;
	173	so->so_upcallarg = (caddr_t)AE_UDPIP; /* Yuck */
	174	so->so_state \|= SS_NBIO;
0b4e3aa0 A	175	so->so_rcv.sb_flags \|=(SB_SEL\|SB_NOINTR);
0b4e3aa0 A	176	so->so_snd.sb_flags \|=(SB_SEL\|SB_NOINTR);
1c79356b A	177
1c79356b A	178	out:
91447636 A	179	sbunlock(&so->so_snd, 0);
91447636 A	180	sbunlock(&so->so_rcv, 0);
1c79356b A	181
	182	return(error);
	183	}
	184
	185	int
	186	AURPgetmsg(err)
	187	int *err;
	188	{ register struct socket *so;
91447636	189	register int events;
1c79356b A	190
	191	so = aurp_global.tunnel;
	192	*err = 0;
	193
	194	for (;;)
	195	{ gbuf_t from, p_mbuf;
	196	int flags = MSG_DONTWAIT;
91447636 A	197	uio_t auio;
91447636 A	198	char uio_buf[ UIO_SIZEOF(0) ];
1c79356b A	199
	200	/*
	201	* Wait for a package to arrive. This will be from the
	202	* IP side - sowakeup() calls aurp_wakeup()
	203	* when a packet arrives
	204	*/
	205
	206	ATDISABLE(s, aurp_global.glock);
	207	events = aurp_global.event;
	208	if (((err == 0) \|\| (err == EWOULDBLOCK)) && events == 0)
	209	{
91447636 A	210	lck_mtx_assert(atalk_mutex, LCK_MTX_ASSERT_OWNED);
91447636 A	211	*err = msleep(&aurp_global.event_anchor, atalk_mutex, PSOCK \| PCATCH, "AURPgetmsg", 0);
1c79356b A	212	events = aurp_global.event;
	213	aurp_global.event = 0;
	214	}
	215	ATENABLE(s, aurp_global.glock);
	216
	217	/*
	218	* Shut down if we have the AE_SHUTDOWN event or if we got
	219	* a system error other than EWOULDBLOCK, such as EINTR.
	220	*/
	221	if (((err != EWOULDBLOCK) && (err != 0)) \|\| events & AE_SHUTDOWN)
	222	{
	223	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	224	("AURPgetmsg: AE_SHUTDOWN detected--starting shutdown sequence\n"));
	225	aurp_global.shutdown = 1;
	226	while (aurp_global.running)
	227	;
	228	/lock_free(&aurp_global.glock);/
	229	aurp_global.tunnel = 0;
	230	aurp_global.event = 0;
	231	aurp_global.shutdown = 0;
	232	soclose(so);
	233	if (*err == 0)
	234	*err = ESHUTDOWN;
	235	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	236	("AURPgetmsg: shutdown completed\n"));
	237	return -1;
	238	}
	239
	240
	241
	242	/*
	243	* Set up the nominal uio structure -
	244	* give it no iov's, point off to non-existant user space,
	245	* but make sure the 'resid' count means somehting.
	246	*/
91447636 A	247	auio = uio_createwithbuffer(0, 0, UIO_SYSSPACE, UIO_READ,
91447636 A	248	&uio_buf[0], sizeof(uio_buf));
1c79356b A	249
	250	/* Keep up an even flow... */
	251	for (;;)
	252	{
	253	/*
	254	* This should be large enough to encompass a full DDP packet plus
	255	* domain header.
	256	*/
	257	#define A_LARGE_SIZE 700
	258
	259	flags = MSG_DONTWAIT;
91447636 A	260	uio_setresid(auio, A_LARGE_SIZE);
91447636 A	261	err = soreceive(so, (struct sockaddr *)&from, auio, &p_mbuf, 0, &flags);
1c79356b A	262	dPrintf(D_M_AURP, D_L_VERBOSE,
	263	("AURPgetmsg: soreceive returned %d, aurp_global.event==0x%x\n", *err, events));
	264	/* soreceive() sets mp to zero! at start /
	265	if (p_mbuf)
55e303ae	266	ip_to_atalk((struct sockaddr_in *)from, p_mbuf);
1c79356b A	267	if (*err \|\| (p_mbuf == NULL)) {
	268	/*
	269	* An error occurred in soreceive(),
	270	* so clear the data input event flag
	271	* and break out of this inner loop.
	272	*
	273	* XXX Note that clearing AE_UDPIP here could
	274	* cause us to lose an AE_UDPIP event that
	275	* was posted in aurp_global.event between
	276	* the soreceive() above and the code here.
	277	* The protocol should recover from this
	278	* lost event, though, since the next
	279	* request (a tickle, for example) from
	280	* the other end of the tunnel will cause
	281	* another AE_UDPIP event to be posted,
	282	* which will wake us from the sleep at
	283	* the top of the outer loop.
	284	*/
1c79356b A	285	ATDISABLE(s, aurp_global.glock);
	286	aurp_global.event &= ~AE_UDPIP;
	287	ATENABLE(s, aurp_global.glock);
	288	dPrintf(D_M_AURP, D_L_WARNING, ("AURPgetmsg: spurious soreceive, err==%d, p_mbuf==0x%x\n", *err, (unsigned int) p_mbuf));
	289	break;
	290	}
	291	}
	292	}
	293	return -1;
	294	}
	295
	296	/*
	297	* Wakeup the sleeping giant - we've put a message on his queue(s).
	298	* The arg indicates what queue has been updated.
	299	*
	300	* This conforms to the so_upcall function pointer member of struct sockbuf.
	301	*/
91447636	302	void aurp_wakeup(__unused struct socket *so, register caddr_t p, __unused int state)
1c79356b	303	{
1c79356b A	304	register int bit;
	305
	306	bit = (int) p;
	307	ATDISABLE(s, aurp_global.glock);
	308	aurp_global.event \|= bit;
	309	ATENABLE(s, aurp_global.glock);
	310
	311	dPrintf(D_M_AURP, D_L_STATE_CHG,
	312	("aurp_wakeup: bit 0x%x, aurp_global.event now 0x%x\n",
	313	bit, aurp_global.event));
	314
9bccf70c	315	wakeup(&aurp_global.event_anchor);
1c79356b A	316	}
	317
	318	/*
	319	* Try to bind to the specified reserved port.
	320	* Sort of like sobind(), but no suser() check.
	321	*/
	322	static int
	323	aurp_bindrp(struct socket *so)
	324	{
	325	struct sockaddr_in sin;
	326	struct proc *p = current_proc();
1c79356b A	327	int error;
	328
	329
	330	bzero(&sin, sizeof(sin));
	331	sin.sin_family = AF_INET;
	332	sin.sin_addr.s_addr = htons(aurp_global.src_addr);
	333	sin.sin_port = htons(aurp_global.udp_port);
	334	sin.sin_len = sizeof(struct sockaddr_in);
	335
	336	sblock(&so->so_rcv, M_WAIT);
	337	sblock(&so->so_snd, M_WAIT);
	338	so->so_state \|= SS_PRIV;
	339	error = (so->so_proto->pr_usrreqs->pru_bind)(so, (struct sockaddr ) &sin, p);
91447636 A	340	sbunlock(&so->so_snd, 0);
91447636 A	341	sbunlock(&so->so_rcv, 0);
1c79356b A	342
	343	return (error);
	344	}
	345
	346	/*
	347	* receive from UDP
	348	* fp is the 'source address' mbuf; p_mbuf is the data mbuf.
	349	* Use the source address to find the 'node number' (index of the address),
	350	* and pass that to the next stage.
	351	*/
	352	int ip_to_atalk(register struct sockaddr_in rem_addr, register gbuf_t p_mbuf)
	353	{
	354	register aurp_domain_t *domain;
	355	unsigned char node;
	356
	357
	358	/* determine the node where the packet came from */
	359	for (node=1; node <= dst_addr_cnt; node++) {
	360	if (aurp_global.dst_addr[node] == (long )&rem_addr->sin_addr)
	361	break;
	362	}
	363	if (node > dst_addr_cnt) {
	364	dPrintf(D_M_AURP, D_L_WARNING,
	365	("AURPrecv: invalid node, %d.%lx\n",
	366	rem_addr->sin_port,
	367	rem_addr->sin_addr.s_addr));
	368
	369	gbuf_freem(p_mbuf);
	370	FREE(rem_addr, M_SONAME);
	371	return -1;
	372	}
	373
	374	/* validate the domain */
	375	domain = (aurp_domain_t *)gbuf_rptr(p_mbuf);
	376	if ( (domain->dst_length != IP_LENGTH) \|\|
	377	(domain->dst_authority != IP_AUTHORITY) \|\|
	378	(domain->version != AUD_Version) \|\|
	379	((domain->type != AUD_Atalk) && (domain->type != AUD_AURP)) ) {
	380	dPrintf(D_M_AURP, D_L_WARNING,
	381	("AURPrecv: invalid domain, %d.%lx\n",
	382	rem_addr->sin_port,
	383	rem_addr->sin_addr.s_addr));
	384
	385	gbuf_freem(p_mbuf);
	386	FREE(rem_addr, M_SONAME);
	387	return -1;
	388	}
	389
	390	/* Remove domain header */
	391	p_mbuf->m_pkthdr.len -= IP_DOMAINSIZE;
	392	gbuf_rinc(p_mbuf,IP_DOMAINSIZE);
	393	gbuf_set_type(p_mbuf, MSG_DATA);
	394
	395	/* forward the packet to the local AppleTalk stack */
	396
	397	at_insert(p_mbuf, domain->type, node);
	398	FREE(rem_addr, M_SONAME);
	399	return 0;
	400	}
	401
	402	/*
	403	* send to UDP
	404	* The real work has been done already. Here, we just cobble together
	405	* a sockaddr for the destination and call sosend().
406	*/
407	void
408	atalk_to_ip(register gbuf_t *m)
409	{ register aurp_domain_t *domain;
410	int error;
411	int flags = MSG_DONTWAIT;
412	struct sockaddr_in rem_addr;
1c79356b A	413
	414	m->m_type = MT_HEADER;
	415	m->m_pkthdr.len = gbuf_msgsize(m);
	416	m->m_pkthdr.rcvif = 0;
	417
	418	bzero((char *) &rem_addr, sizeof(rem_addr));
	419	rem_addr.sin_family = PF_INET;
	420	rem_addr.sin_port = aurp_global.udp_port;
	421	rem_addr.sin_len = sizeof (struct sockaddr_in);
	422	domain = (aurp_domain_t *)gbuf_rptr(m);
	423	(long ) &rem_addr.sin_addr = domain->dst_address;
	424
	425	ATDISABLE(s, aurp_global.glock);
	426	aurp_global.running++;
	427	ATENABLE(s, aurp_global.glock);
	428	if (aurp_global.shutdown) {
	429	gbuf_freem(m);
	430	ATDISABLE(s, aurp_global.glock);
	431	aurp_global.running--;
	432	ATENABLE(s, aurp_global.glock);
	433	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	434	("atalk_to_ip: detected aurp_global.shutdown state\n"));
	435	return;
	436	}
	437	dPrintf(D_M_AURP, D_L_VERBOSE, ("atalk_to_ip: calling sosend\n"));
	438	error = sosend(aurp_global.tunnel, (struct sockaddr *) &rem_addr, NULL, m, NULL, flags);
	439	if (error)
	440	{ /log error/
	441	dPrintf(D_M_AURP, D_L_ERROR, ("AURP: sosend error (%d)\n",
	442	error));
	443	}
	444
	445	ATDISABLE(s, aurp_global.glock);
	446	aurp_global.running--;
	447	ATENABLE(s, aurp_global.glock);
	448	return;
	449	}
	450