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

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_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
 */
#ifdef AURP_SUPPORT

#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_pcb.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);*/
	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
		 */

		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;
		  }	

		/*
		 * 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.
				 */
				aurp_global.event &= ~AE_UDPIP;
				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;
	aurp_global.event |= bit;

	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_mchtype(m, 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;

	aurp_global.running++;
	if (aurp_global.shutdown) {
		gbuf_freem(m);
		aurp_global.running--;
		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));
	}

	aurp_global.running--;
	return;
}

#endif  /* AURP_SUPPORT */
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* Copyright (c) 1996 Apple Computer, Inc.
	30	*
	31	* Created April 25, 1996, by Justin C. Walker
	32	* Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
	33	*
	34	* File: aurpd.c
	35	*/
	36
	37	/*
	38	* Kernel process to implement the AURP daemon:
	39	* manage tunnels to remote AURP servers across IP networks
	40	*/
0c530ab8	41	#ifdef AURP_SUPPORT
1c79356b A	42
	43	#include <sys/errno.h>
	44	#include <sys/types.h>
	45	#include <sys/param.h>
	46	#include <machine/spl.h>
	47	#include <sys/systm.h>
	48	#include <sys/kernel.h>
	49	#include <sys/proc.h>
91447636	50	#include <sys/kauth.h>
1c79356b A	51	#include <sys/filedesc.h>
	52	#include <sys/fcntl.h>
	53	#include <sys/mbuf.h>
	54	#include <sys/socket.h>
	55	#include <sys/socketvar.h>
	56	#include <sys/protosw.h>
	57	#include <sys/malloc.h>
	58	#include <sys/proc.h>
91447636 A	59	#include <sys/uio_internal.h>
91447636 A	60	#include <kern/locks.h>
1c79356b A	61	#include <netinet/in.h>
	62	#include <net/if.h>
	63
	64	#include <netat/sysglue.h>
	65	#include <netat/appletalk.h>
2d21ac55	66	#include <netat/at_pcb.h>
1c79356b A	67	#include <netat/at_var.h>
	68	#include <netat/routing_tables.h>
	69	#include <netat/at_pcb.h>
	70	#include <netat/aurp.h>
	71	#include <netat/debug.h>
	72
	73	#define M_RCVBUF (64 * 1024)
	74	#define M_SNDBUF (64 * 1024)
	75
91447636 A	76	extern lck_mtx_t * atalk_mutex;
91447636 A	77
1c79356b A	78	static int ip_to_atalk(struct sockaddr_in fp, register gbuf_t p_mbuf);
	79	static int aurp_bindrp(struct socket *so);
	80
	81	struct aurp_global_t aurp_global;
	82
	83	/*
	84	* Initialize the aurp pipe -
	85	* -Create, initialize, and start the aurpd kernel process; we need
	86	* a process to permit queueing between the socket and the stream,
	87	* which is necessary for orderly access to the socket structure.
	88	* -The user process (aurpd) is there to 'build' the AURP
	89	* stream, act as a 'logging agent' (:-}), and hold open the stream
	90	* during its use.
	91	* -Data and AURP packets from the DDP stream will be fed into the
	92	* UDP tunnel (AURPsend())
	93	* -Data and AURP packets from the UDP tunnel will be fed into the
	94	* DDP stream (ip_to_atalk(), via the kernel process).
	95	*/
	96	int
	97	aurpd_start()
	98	{
	99	register int error;
	100	register struct socket *so;
	101	struct mbuf *m;
	102	int maxbuf;
	103	struct sockopt sopt;
	104
91447636	105	if (suser(kauth_cred_get(), 0) != 0 )
1c79356b A	106	return(EPERM);
	107
	108	/*
	109	* Set up state prior to starting kernel process so we can back out
	110	* (error return) if something goes wrong.
	111	*/
	112	bzero((char *)&aurp_global.tunnel, sizeof(aurp_global.tunnel));
	113	/lock_alloc(&aurp_global.glock, LOCK_ALLOC_PIN, AURP_EVNT_LOCK, -1);/
1c79356b A	114	ATEVENTINIT(aurp_global.event_anchor);
	115
	116	/* open udp socket */
	117	if (aurp_global.udp_port == 0)
	118	aurp_global.udp_port = AURP_SOCKNUM;
	119	error = socreate(AF_INET, &aurp_global.tunnel, SOCK_DGRAM,
	120	IPPROTO_UDP);
	121	if (error)
	122	{ dPrintf(D_M_AURP, D_L_FATAL, ("AURP: Can't get socket (%d)\n",
	123	error));
	124	return(error);
	125	}
	126
	127	so = aurp_global.tunnel;
	128
	129	if ((error = aurp_bindrp(so)) != 0)
	130	{ dPrintf(D_M_AURP, D_L_FATAL,
	131	("AURP: Can't bind to port %d (error %d)\n",
	132	aurp_global.udp_port, error));
	133	soclose(so);
	134	return(error);
	135	}
	136
	137	sblock(&so->so_rcv, M_WAIT);
	138	sblock(&so->so_snd, M_WAIT);
	139
	140	/*
	141	* Set socket Receive buffer size
	142	*/
	143	m = m_get(M_WAIT, MT_SOOPTS);
	144	if (m == NULL) {
	145	error = ENOBUFS;
	146	goto out;
	147	} else {
	148	maxbuf = M_RCVBUF;
91447636	149	sopt.sopt_val = CAST_USER_ADDR_T(&maxbuf);
1c79356b A	150	sopt.sopt_valsize = sizeof(maxbuf);
	151	sopt.sopt_level = SOL_SOCKET;
	152	sopt.sopt_name = SO_RCVBUF;
	153	sopt.sopt_dir = SOPT_SET;
0b4e3aa0	154	sopt.sopt_p = NULL;
1c79356b A	155	if ((error = sosetopt(so, &sopt)) != 0)
	156	goto out;
	157	}
	158
	159	/*
	160	* Set socket Send buffer size
	161	*/
	162	m = m_get(M_WAIT, MT_SOOPTS);
	163	if (m == NULL) {
	164	error = ENOBUFS;
	165	goto out;
	166	} else {
	167
	168	maxbuf = M_SNDBUF;
91447636	169	sopt.sopt_val = CAST_USER_ADDR_T(&maxbuf);
1c79356b A	170	sopt.sopt_valsize = sizeof(maxbuf);
	171	sopt.sopt_level = SOL_SOCKET;
	172	sopt.sopt_name = SO_SNDBUF;
	173	sopt.sopt_dir = SOPT_SET;
0b4e3aa0	174	sopt.sopt_p = NULL;
1c79356b A	175	if ((error = sosetopt(so, &sopt)) != 0)
	176	goto out;
	177	}
	178
	179	so->so_upcall = aurp_wakeup;
	180	so->so_upcallarg = (caddr_t)AE_UDPIP; /* Yuck */
	181	so->so_state \|= SS_NBIO;
0b4e3aa0 A	182	so->so_rcv.sb_flags \|=(SB_SEL\|SB_NOINTR);
0b4e3aa0 A	183	so->so_snd.sb_flags \|=(SB_SEL\|SB_NOINTR);
1c79356b A	184
1c79356b A	185	out:
91447636 A	186	sbunlock(&so->so_snd, 0);
91447636 A	187	sbunlock(&so->so_rcv, 0);
1c79356b A	188
	189	return(error);
	190	}
	191
	192	int
	193	AURPgetmsg(err)
	194	int *err;
	195	{ register struct socket *so;
91447636	196	register int events;
1c79356b A	197
	198	so = aurp_global.tunnel;
	199	*err = 0;
	200
	201	for (;;)
	202	{ gbuf_t from, p_mbuf;
	203	int flags = MSG_DONTWAIT;
91447636 A	204	uio_t auio;
91447636 A	205	char uio_buf[ UIO_SIZEOF(0) ];
1c79356b A	206
	207	/*
	208	* Wait for a package to arrive. This will be from the
	209	* IP side - sowakeup() calls aurp_wakeup()
	210	* when a packet arrives
	211	*/
	212
1c79356b A	213	events = aurp_global.event;
	214	if (((err == 0) \|\| (err == EWOULDBLOCK)) && events == 0)
	215	{
91447636 A	216	lck_mtx_assert(atalk_mutex, LCK_MTX_ASSERT_OWNED);
91447636 A	217	*err = msleep(&aurp_global.event_anchor, atalk_mutex, PSOCK \| PCATCH, "AURPgetmsg", 0);
1c79356b A	218	events = aurp_global.event;
	219	aurp_global.event = 0;
	220	}
1c79356b A	221
	222	/*
	223	* Shut down if we have the AE_SHUTDOWN event or if we got
	224	* a system error other than EWOULDBLOCK, such as EINTR.
	225	*/
	226	if (((err != EWOULDBLOCK) && (err != 0)) \|\| events & AE_SHUTDOWN)
	227	{
	228	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	229	("AURPgetmsg: AE_SHUTDOWN detected--starting shutdown sequence\n"));
	230	aurp_global.shutdown = 1;
	231	while (aurp_global.running)
	232	;
	233	/lock_free(&aurp_global.glock);/
	234	aurp_global.tunnel = 0;
	235	aurp_global.event = 0;
	236	aurp_global.shutdown = 0;
	237	soclose(so);
	238	if (*err == 0)
	239	*err = ESHUTDOWN;
	240	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	241	("AURPgetmsg: shutdown completed\n"));
	242	return -1;
	243	}
	244
	245
	246
	247	/*
	248	* Set up the nominal uio structure -
	249	* give it no iov's, point off to non-existant user space,
	250	* but make sure the 'resid' count means somehting.
	251	*/
91447636 A	252	auio = uio_createwithbuffer(0, 0, UIO_SYSSPACE, UIO_READ,
91447636 A	253	&uio_buf[0], sizeof(uio_buf));
1c79356b A	254
	255	/* Keep up an even flow... */
	256	for (;;)
	257	{
	258	/*
	259	* This should be large enough to encompass a full DDP packet plus
	260	* domain header.
	261	*/
	262	#define A_LARGE_SIZE 700
	263
	264	flags = MSG_DONTWAIT;
91447636 A	265	uio_setresid(auio, A_LARGE_SIZE);
91447636 A	266	err = soreceive(so, (struct sockaddr *)&from, auio, &p_mbuf, 0, &flags);
1c79356b A	267	dPrintf(D_M_AURP, D_L_VERBOSE,
	268	("AURPgetmsg: soreceive returned %d, aurp_global.event==0x%x\n", *err, events));
	269	/* soreceive() sets mp to zero! at start /
	270	if (p_mbuf)
55e303ae	271	ip_to_atalk((struct sockaddr_in *)from, p_mbuf);
1c79356b A	272	if (*err \|\| (p_mbuf == NULL)) {
	273	/*
	274	* An error occurred in soreceive(),
	275	* so clear the data input event flag
	276	* and break out of this inner loop.
	277	*
	278	* XXX Note that clearing AE_UDPIP here could
	279	* cause us to lose an AE_UDPIP event that
	280	* was posted in aurp_global.event between
	281	* the soreceive() above and the code here.
	282	* The protocol should recover from this
	283	* lost event, though, since the next
	284	* request (a tickle, for example) from
	285	* the other end of the tunnel will cause
	286	* another AE_UDPIP event to be posted,
	287	* which will wake us from the sleep at
	288	* the top of the outer loop.
	289	*/
1c79356b	290	aurp_global.event &= ~AE_UDPIP;
1c79356b A	291	dPrintf(D_M_AURP, D_L_WARNING, ("AURPgetmsg: spurious soreceive, err==%d, p_mbuf==0x%x\n", *err, (unsigned int) p_mbuf));
	292	break;
	293	}
	294	}
	295	}
	296	return -1;
	297	}
	298
	299	/*
	300	* Wakeup the sleeping giant - we've put a message on his queue(s).
	301	* The arg indicates what queue has been updated.
	302	*
	303	* This conforms to the so_upcall function pointer member of struct sockbuf.
	304	*/
91447636	305	void aurp_wakeup(__unused struct socket *so, register caddr_t p, __unused int state)
1c79356b	306	{
1c79356b A	307	register int bit;
	308
	309	bit = (int) p;
1c79356b	310	aurp_global.event \|= bit;
1c79356b A	311
	312	dPrintf(D_M_AURP, D_L_STATE_CHG,
	313	("aurp_wakeup: bit 0x%x, aurp_global.event now 0x%x\n",
	314	bit, aurp_global.event));
	315
9bccf70c	316	wakeup(&aurp_global.event_anchor);
1c79356b A	317	}
	318
	319	/*
	320	* Try to bind to the specified reserved port.
	321	* Sort of like sobind(), but no suser() check.
	322	*/
	323	static int
	324	aurp_bindrp(struct socket *so)
	325	{
	326	struct sockaddr_in sin;
	327	struct proc *p = current_proc();
1c79356b A	328	int error;
	329
	330
	331	bzero(&sin, sizeof(sin));
	332	sin.sin_family = AF_INET;
	333	sin.sin_addr.s_addr = htons(aurp_global.src_addr);
	334	sin.sin_port = htons(aurp_global.udp_port);
	335	sin.sin_len = sizeof(struct sockaddr_in);
	336
	337	sblock(&so->so_rcv, M_WAIT);
	338	sblock(&so->so_snd, M_WAIT);
	339	so->so_state \|= SS_PRIV;
	340	error = (so->so_proto->pr_usrreqs->pru_bind)(so, (struct sockaddr ) &sin, p);
91447636 A	341	sbunlock(&so->so_snd, 0);
91447636 A	342	sbunlock(&so->so_rcv, 0);
1c79356b A	343
	344	return (error);
	345	}
	346
	347	/*
	348	* receive from UDP
	349	* fp is the 'source address' mbuf; p_mbuf is the data mbuf.
	350	* Use the source address to find the 'node number' (index of the address),
	351	* and pass that to the next stage.
	352	*/
	353	int ip_to_atalk(register struct sockaddr_in rem_addr, register gbuf_t p_mbuf)
	354	{
	355	register aurp_domain_t *domain;
	356	unsigned char node;
	357
	358
	359	/* determine the node where the packet came from */
	360	for (node=1; node <= dst_addr_cnt; node++) {
	361	if (aurp_global.dst_addr[node] == (long )&rem_addr->sin_addr)
	362	break;
	363	}
	364	if (node > dst_addr_cnt) {
	365	dPrintf(D_M_AURP, D_L_WARNING,
	366	("AURPrecv: invalid node, %d.%lx\n",
	367	rem_addr->sin_port,
	368	rem_addr->sin_addr.s_addr));
	369
	370	gbuf_freem(p_mbuf);
	371	FREE(rem_addr, M_SONAME);
	372	return -1;
	373	}
	374
	375	/* validate the domain */
	376	domain = (aurp_domain_t *)gbuf_rptr(p_mbuf);
	377	if ( (domain->dst_length != IP_LENGTH) \|\|
	378	(domain->dst_authority != IP_AUTHORITY) \|\|
	379	(domain->version != AUD_Version) \|\|
	380	((domain->type != AUD_Atalk) && (domain->type != AUD_AURP)) ) {
	381	dPrintf(D_M_AURP, D_L_WARNING,
	382	("AURPrecv: invalid domain, %d.%lx\n",
	383	rem_addr->sin_port,
	384	rem_addr->sin_addr.s_addr));
	385
	386	gbuf_freem(p_mbuf);
	387	FREE(rem_addr, M_SONAME);
	388	return -1;
	389	}
	390
	391	/* Remove domain header */
	392	p_mbuf->m_pkthdr.len -= IP_DOMAINSIZE;
	393	gbuf_rinc(p_mbuf,IP_DOMAINSIZE);
	394	gbuf_set_type(p_mbuf, MSG_DATA);
	395
	396	/* forward the packet to the local AppleTalk stack */
	397
	398	at_insert(p_mbuf, domain->type, node);
	399	FREE(rem_addr, M_SONAME);
	400	return 0;
	401	}
	402
	403	/*
	404	* send to UDP
	405	* The real work has been done already. Here, we just cobble together
	406	* a sockaddr for the destination and call sosend().
407	*/
408	void
409	atalk_to_ip(register gbuf_t *m)
410	{ register aurp_domain_t *domain;
411	int error;
412	int flags = MSG_DONTWAIT;
413	struct sockaddr_in rem_addr;
1c79356b	414
2d21ac55	415	m_mchtype(m, MT_HEADER);
1c79356b A	416	m->m_pkthdr.len = gbuf_msgsize(m);
	417	m->m_pkthdr.rcvif = 0;
	418
	419	bzero((char *) &rem_addr, sizeof(rem_addr));
	420	rem_addr.sin_family = PF_INET;
	421	rem_addr.sin_port = aurp_global.udp_port;
	422	rem_addr.sin_len = sizeof (struct sockaddr_in);
	423	domain = (aurp_domain_t *)gbuf_rptr(m);
	424	(long ) &rem_addr.sin_addr = domain->dst_address;
	425
1c79356b	426	aurp_global.running++;
1c79356b A	427	if (aurp_global.shutdown) {
1c79356b A	428	gbuf_freem(m);
1c79356b	429	aurp_global.running--;
1c79356b A	430	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	431	("atalk_to_ip: detected aurp_global.shutdown state\n"));
	432	return;
	433	}
	434	dPrintf(D_M_AURP, D_L_VERBOSE, ("atalk_to_ip: calling sosend\n"));
	435	error = sosend(aurp_global.tunnel, (struct sockaddr *) &rem_addr, NULL, m, NULL, flags);
	436	if (error)
	437	{ /log error/
	438	dPrintf(D_M_AURP, D_L_ERROR, ("AURP: sosend error (%d)\n",
	439	error));
	440	}
	441
1c79356b	442	aurp_global.running--;
1c79356b A	443	return;
	444	}
	445
2d21ac55	446	#endif /* AURP_SUPPORT */