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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_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/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 <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)

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(current_proc()->p_ucred, &current_proc()->p_acflag) != 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     = &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     = &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);
	sbunlock(&so->so_rcv);

	return(error);
}

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

	so = aurp_global.tunnel;
	*err = 0;

	for (;;)
	{	gbuf_t *from, *p_mbuf;
		int flags = MSG_DONTWAIT;
		struct uio auio;

		/*
		 * 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)
		  {
		    *err = tsleep(&aurp_global.event_anchor, 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_iov = NULL;
		auio.uio_iovcnt = 0;
		auio.uio_segflg = UIO_SYSSPACE;
		auio.uio_offset = 0;			/* XXX */

		/* 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;
			auio.uio_resid = 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.
				 */
				int s;
				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(struct socket *so, register caddr_t p, int state)
{
	register int s;
	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();
	gbuf_t *m;
	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);
	sbunlock(&so->so_rcv);

	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;
	int s;

	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 A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	* Copyright (c) 1996 Apple Computer, Inc.
	27	*
	28	* Created April 25, 1996, by Justin C. Walker
	29	* Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
	30	*
	31	* File: aurpd.c
	32	*/
	33
	34	/*
	35	* Kernel process to implement the AURP daemon:
	36	* manage tunnels to remote AURP servers across IP networks
	37	*/
	38
	39	#include <sys/errno.h>
	40	#include <sys/types.h>
	41	#include <sys/param.h>
	42	#include <machine/spl.h>
	43	#include <sys/systm.h>
	44	#include <sys/kernel.h>
	45	#include <sys/proc.h>
	46	#include <sys/filedesc.h>
	47	#include <sys/fcntl.h>
	48	#include <sys/mbuf.h>
	49	#include <sys/socket.h>
	50	#include <sys/socketvar.h>
	51	#include <sys/protosw.h>
	52	#include <sys/malloc.h>
	53	#include <sys/proc.h>
	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
	68	static int ip_to_atalk(struct sockaddr_in fp, register gbuf_t p_mbuf);
	69	static int aurp_bindrp(struct socket *so);
	70
	71	struct aurp_global_t aurp_global;
	72
	73	/*
	74	* Initialize the aurp pipe -
	75	* -Create, initialize, and start the aurpd kernel process; we need
	76	* a process to permit queueing between the socket and the stream,
	77	* which is necessary for orderly access to the socket structure.
	78	* -The user process (aurpd) is there to 'build' the AURP
	79	* stream, act as a 'logging agent' (:-}), and hold open the stream
	80	* during its use.
	81	* -Data and AURP packets from the DDP stream will be fed into the
	82	* UDP tunnel (AURPsend())
	83	* -Data and AURP packets from the UDP tunnel will be fed into the
	84	* DDP stream (ip_to_atalk(), via the kernel process).
	85	*/
86	int
87	aurpd_start()
88	{
89	register int error;
90	register struct socket *so;
91	struct mbuf *m;
92	int maxbuf;
93	struct sockopt sopt;
94
95	if (suser(current_proc()->p_ucred, &current_proc()->p_acflag) != 0 )
96	return(EPERM);
97
98	/*
99	* Set up state prior to starting kernel process so we can back out
100	* (error return) if something goes wrong.
101	*/
102	bzero((char *)&aurp_global.tunnel, sizeof(aurp_global.tunnel));
103	/lock_alloc(&aurp_global.glock, LOCK_ALLOC_PIN, AURP_EVNT_LOCK, -1);/
104	ATLOCKINIT(aurp_global.glock);
105	ATEVENTINIT(aurp_global.event_anchor);
106
107	/* open udp socket */
108	if (aurp_global.udp_port == 0)
109	aurp_global.udp_port = AURP_SOCKNUM;
110	error = socreate(AF_INET, &aurp_global.tunnel, SOCK_DGRAM,
111	IPPROTO_UDP);
112	if (error)
113	{ dPrintf(D_M_AURP, D_L_FATAL, ("AURP: Can't get socket (%d)\n",
114	error));
115	return(error);
116	}
117
118	so = aurp_global.tunnel;
119
120	if ((error = aurp_bindrp(so)) != 0)
121	{ dPrintf(D_M_AURP, D_L_FATAL,
122	("AURP: Can't bind to port %d (error %d)\n",
123	aurp_global.udp_port, error));
124	soclose(so);
125	return(error);
126	}
127
128	sblock(&so->so_rcv, M_WAIT);
129	sblock(&so->so_snd, M_WAIT);
130
131	/*
132	* Set socket Receive buffer size
133	*/
134	m = m_get(M_WAIT, MT_SOOPTS);
135	if (m == NULL) {
136	error = ENOBUFS;
137	goto out;
138	} else {
139	maxbuf = M_RCVBUF;
140	sopt.sopt_val = &maxbuf;
141	sopt.sopt_valsize = sizeof(maxbuf);
142	sopt.sopt_level = SOL_SOCKET;
143	sopt.sopt_name = SO_RCVBUF;
144	sopt.sopt_dir = SOPT_SET;
0b4e3aa0	145	sopt.sopt_p = NULL;
1c79356b A	146	if ((error = sosetopt(so, &sopt)) != 0)
	147	goto out;
	148	}
	149
	150	/*
	151	* Set socket Send buffer size
	152	*/
	153	m = m_get(M_WAIT, MT_SOOPTS);
	154	if (m == NULL) {
	155	error = ENOBUFS;
	156	goto out;
	157	} else {
	158
	159	maxbuf = M_SNDBUF;
	160	sopt.sopt_val = &maxbuf;
	161	sopt.sopt_valsize = sizeof(maxbuf);
	162	sopt.sopt_level = SOL_SOCKET;
	163	sopt.sopt_name = SO_SNDBUF;
	164	sopt.sopt_dir = SOPT_SET;
0b4e3aa0	165	sopt.sopt_p = NULL;
1c79356b A	166	if ((error = sosetopt(so, &sopt)) != 0)
	167	goto out;
	168	}
	169
	170	so->so_upcall = aurp_wakeup;
	171	so->so_upcallarg = (caddr_t)AE_UDPIP; /* Yuck */
	172	so->so_state \|= SS_NBIO;
0b4e3aa0 A	173	so->so_rcv.sb_flags \|=(SB_SEL\|SB_NOINTR);
0b4e3aa0 A	174	so->so_snd.sb_flags \|=(SB_SEL\|SB_NOINTR);
1c79356b A	175
	176	out:
	177	sbunlock(&so->so_snd);
	178	sbunlock(&so->so_rcv);
	179
	180	return(error);
	181	}
	182
	183	int
	184	AURPgetmsg(err)
	185	int *err;
	186	{ register struct socket *so;
	187	register int s, events;
	188
	189	so = aurp_global.tunnel;
	190	*err = 0;
	191
	192	for (;;)
	193	{ gbuf_t from, p_mbuf;
	194	int flags = MSG_DONTWAIT;
	195	struct uio auio;
	196
	197	/*
	198	* Wait for a package to arrive. This will be from the
	199	* IP side - sowakeup() calls aurp_wakeup()
	200	* when a packet arrives
	201	*/
	202
	203	ATDISABLE(s, aurp_global.glock);
	204	events = aurp_global.event;
	205	if (((err == 0) \|\| (err == EWOULDBLOCK)) && events == 0)
	206	{
	207	*err = tsleep(&aurp_global.event_anchor, PSOCK \| PCATCH, "AURPgetmsg", 0);
	208	events = aurp_global.event;
	209	aurp_global.event = 0;
	210	}
	211	ATENABLE(s, aurp_global.glock);
	212
	213	/*
	214	* Shut down if we have the AE_SHUTDOWN event or if we got
	215	* a system error other than EWOULDBLOCK, such as EINTR.
	216	*/
	217	if (((err != EWOULDBLOCK) && (err != 0)) \|\| events & AE_SHUTDOWN)
	218	{
	219	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	220	("AURPgetmsg: AE_SHUTDOWN detected--starting shutdown sequence\n"));
	221	aurp_global.shutdown = 1;
	222	while (aurp_global.running)
	223	;
	224	/lock_free(&aurp_global.glock);/
	225	aurp_global.tunnel = 0;
	226	aurp_global.event = 0;
	227	aurp_global.shutdown = 0;
	228	soclose(so);
	229	if (*err == 0)
	230	*err = ESHUTDOWN;
	231	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	232	("AURPgetmsg: shutdown completed\n"));
	233	return -1;
	234	}
	235
	236
	237
	238	/*
239	* Set up the nominal uio structure -
240	* give it no iov's, point off to non-existant user space,
241	* but make sure the 'resid' count means somehting.
242	*/
243
244	auio.uio_iov = NULL;
245	auio.uio_iovcnt = 0;
246	auio.uio_segflg = UIO_SYSSPACE;
247	auio.uio_offset = 0; /* XXX */
248
249	/* Keep up an even flow... */
250	for (;;)
251	{
252	/*
253	* This should be large enough to encompass a full DDP packet plus
254	* domain header.
255	*/
256	#define A_LARGE_SIZE 700
257
258	flags = MSG_DONTWAIT;
259	auio.uio_resid = A_LARGE_SIZE;
260	err = soreceive(so, (struct sockaddr *)&from, &auio, &p_mbuf, 0, &flags);
261	dPrintf(D_M_AURP, D_L_VERBOSE,
262	("AURPgetmsg: soreceive returned %d, aurp_global.event==0x%x\n", *err, events));
263	/* soreceive() sets mp to zero! at start /
264	if (p_mbuf)
55e303ae	265	ip_to_atalk((struct sockaddr_in *)from, p_mbuf);
1c79356b A	266	if (*err \|\| (p_mbuf == NULL)) {
	267	/*
	268	* An error occurred in soreceive(),
	269	* so clear the data input event flag
	270	* and break out of this inner loop.
	271	*
	272	* XXX Note that clearing AE_UDPIP here could
	273	* cause us to lose an AE_UDPIP event that
	274	* was posted in aurp_global.event between
	275	* the soreceive() above and the code here.
	276	* The protocol should recover from this
	277	* lost event, though, since the next
	278	* request (a tickle, for example) from
	279	* the other end of the tunnel will cause
	280	* another AE_UDPIP event to be posted,
	281	* which will wake us from the sleep at
	282	* the top of the outer loop.
	283	*/
	284	int s;
	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	*/
	302	void aurp_wakeup(struct socket *so, register caddr_t p, int state)
	303	{
	304	register int s;
	305	register int bit;
	306
	307	bit = (int) p;
	308	ATDISABLE(s, aurp_global.glock);
	309	aurp_global.event \|= bit;
	310	ATENABLE(s, aurp_global.glock);
	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();
	328	gbuf_t *m;
	329	int error;
	330
	331
	332	bzero(&sin, sizeof(sin));
	333	sin.sin_family = AF_INET;
	334	sin.sin_addr.s_addr = htons(aurp_global.src_addr);
	335	sin.sin_port = htons(aurp_global.udp_port);
	336	sin.sin_len = sizeof(struct sockaddr_in);
	337
	338	sblock(&so->so_rcv, M_WAIT);
	339	sblock(&so->so_snd, M_WAIT);
	340	so->so_state \|= SS_PRIV;
	341	error = (so->so_proto->pr_usrreqs->pru_bind)(so, (struct sockaddr ) &sin, p);
	342	sbunlock(&so->so_snd);
	343	sbunlock(&so->so_rcv);
	344
	345	return (error);
	346	}
	347
	348	/*
	349	* receive from UDP
	350	* fp is the 'source address' mbuf; p_mbuf is the data mbuf.
	351	* Use the source address to find the 'node number' (index of the address),
	352	* and pass that to the next stage.
	353	*/
	354	int ip_to_atalk(register struct sockaddr_in rem_addr, register gbuf_t p_mbuf)
	355	{
	356	register aurp_domain_t *domain;
	357	unsigned char node;
	358
	359
	360	/* determine the node where the packet came from */
	361	for (node=1; node <= dst_addr_cnt; node++) {
	362	if (aurp_global.dst_addr[node] == (long )&rem_addr->sin_addr)
	363	break;
	364	}
	365	if (node > dst_addr_cnt) {
	366	dPrintf(D_M_AURP, D_L_WARNING,
	367	("AURPrecv: invalid node, %d.%lx\n",
	368	rem_addr->sin_port,
	369	rem_addr->sin_addr.s_addr));
	370
	371	gbuf_freem(p_mbuf);
	372	FREE(rem_addr, M_SONAME);
	373	return -1;
	374	}
	375
	376	/* validate the domain */
	377	domain = (aurp_domain_t *)gbuf_rptr(p_mbuf);
	378	if ( (domain->dst_length != IP_LENGTH) \|\|
	379	(domain->dst_authority != IP_AUTHORITY) \|\|
	380	(domain->version != AUD_Version) \|\|
381	((domain->type != AUD_Atalk) && (domain->type != AUD_AURP)) ) {
382	dPrintf(D_M_AURP, D_L_WARNING,
383	("AURPrecv: invalid domain, %d.%lx\n",
384	rem_addr->sin_port,
385	rem_addr->sin_addr.s_addr));
386
387	gbuf_freem(p_mbuf);
388	FREE(rem_addr, M_SONAME);
389	return -1;
390	}
391
392	/* Remove domain header */
393	p_mbuf->m_pkthdr.len -= IP_DOMAINSIZE;
394	gbuf_rinc(p_mbuf,IP_DOMAINSIZE);
395	gbuf_set_type(p_mbuf, MSG_DATA);
396
397	/* forward the packet to the local AppleTalk stack */
398
399	at_insert(p_mbuf, domain->type, node);
400	FREE(rem_addr, M_SONAME);
401	return 0;
402	}
403
404	/*
405	* send to UDP
406	* The real work has been done already. Here, we just cobble together
407	* a sockaddr for the destination and call sosend().
408	*/
409	void
410	atalk_to_ip(register gbuf_t *m)
411	{ register aurp_domain_t *domain;
412	int error;
413	int flags = MSG_DONTWAIT;
414	struct sockaddr_in rem_addr;
415	int s;
416
417	m->m_type = MT_HEADER;
418	m->m_pkthdr.len = gbuf_msgsize(m);
419	m->m_pkthdr.rcvif = 0;
420
421	bzero((char *) &rem_addr, sizeof(rem_addr));
422	rem_addr.sin_family = PF_INET;
423	rem_addr.sin_port = aurp_global.udp_port;
424	rem_addr.sin_len = sizeof (struct sockaddr_in);
425	domain = (aurp_domain_t *)gbuf_rptr(m);
426	(long ) &rem_addr.sin_addr = domain->dst_address;
427
428	ATDISABLE(s, aurp_global.glock);
429	aurp_global.running++;
430	ATENABLE(s, aurp_global.glock);
431	if (aurp_global.shutdown) {
432	gbuf_freem(m);
433	ATDISABLE(s, aurp_global.glock);
434	aurp_global.running--;
435	ATENABLE(s, aurp_global.glock);
436	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
437	("atalk_to_ip: detected aurp_global.shutdown state\n"));
438	return;
439	}
440	dPrintf(D_M_AURP, D_L_VERBOSE, ("atalk_to_ip: calling sosend\n"));
441	error = sosend(aurp_global.tunnel, (struct sockaddr *) &rem_addr, NULL, m, NULL, flags);
442	if (error)
443	{ /log error/
444	dPrintf(D_M_AURP, D_L_ERROR, ("AURP: sosend error (%d)\n",
445	error));
446	}
447
448	ATDISABLE(s, aurp_global.glock);
449	aurp_global.running--;
450	ATENABLE(s, aurp_global.glock);
451	return;
452	}
453