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

/*
 * Copyright (c) 2000 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/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	*
e5568f75 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	*
e5568f75 A	12	* This Original Code and all software distributed under the License are
e5568f75 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,
e5568f75 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>
	43	#include <sys/filedesc.h>
	44	#include <sys/fcntl.h>
	45	#include <sys/mbuf.h>
	46	#include <sys/socket.h>
	47	#include <sys/socketvar.h>
	48	#include <sys/protosw.h>
	49	#include <sys/malloc.h>
	50	#include <sys/proc.h>
	51	#include <netinet/in.h>
	52	#include <net/if.h>
	53
	54	#include <netat/sysglue.h>
	55	#include <netat/appletalk.h>
	56	#include <netat/at_var.h>
	57	#include <netat/routing_tables.h>
	58	#include <netat/at_pcb.h>
	59	#include <netat/aurp.h>
	60	#include <netat/debug.h>
	61
	62	#define M_RCVBUF (64 * 1024)
	63	#define M_SNDBUF (64 * 1024)
	64
	65	static int ip_to_atalk(struct sockaddr_in fp, register gbuf_t p_mbuf);
	66	static int aurp_bindrp(struct socket *so);
	67
	68	struct aurp_global_t aurp_global;
	69
	70	/*
	71	* Initialize the aurp pipe -
	72	* -Create, initialize, and start the aurpd kernel process; we need
	73	* a process to permit queueing between the socket and the stream,
	74	* which is necessary for orderly access to the socket structure.
	75	* -The user process (aurpd) is there to 'build' the AURP
	76	* stream, act as a 'logging agent' (:-}), and hold open the stream
	77	* during its use.
	78	* -Data and AURP packets from the DDP stream will be fed into the
	79	* UDP tunnel (AURPsend())
	80	* -Data and AURP packets from the UDP tunnel will be fed into the
	81	* DDP stream (ip_to_atalk(), via the kernel process).
	82	*/
83	int
84	aurpd_start()
85	{
86	register int error;
87	register struct socket *so;
88	struct mbuf *m;
89	int maxbuf;
90	struct sockopt sopt;
91
92	if (suser(current_proc()->p_ucred, &current_proc()->p_acflag) != 0 )
93	return(EPERM);
94
95	/*
96	* Set up state prior to starting kernel process so we can back out
97	* (error return) if something goes wrong.
98	*/
99	bzero((char *)&aurp_global.tunnel, sizeof(aurp_global.tunnel));
100	/lock_alloc(&aurp_global.glock, LOCK_ALLOC_PIN, AURP_EVNT_LOCK, -1);/
101	ATLOCKINIT(aurp_global.glock);
102	ATEVENTINIT(aurp_global.event_anchor);
103
104	/* open udp socket */
105	if (aurp_global.udp_port == 0)
106	aurp_global.udp_port = AURP_SOCKNUM;
107	error = socreate(AF_INET, &aurp_global.tunnel, SOCK_DGRAM,
108	IPPROTO_UDP);
109	if (error)
110	{ dPrintf(D_M_AURP, D_L_FATAL, ("AURP: Can't get socket (%d)\n",
111	error));
112	return(error);
113	}
114
115	so = aurp_global.tunnel;
116
117	if ((error = aurp_bindrp(so)) != 0)
118	{ dPrintf(D_M_AURP, D_L_FATAL,
119	("AURP: Can't bind to port %d (error %d)\n",
120	aurp_global.udp_port, error));
121	soclose(so);
122	return(error);
123	}
124
125	sblock(&so->so_rcv, M_WAIT);
126	sblock(&so->so_snd, M_WAIT);
127
128	/*
129	* Set socket Receive buffer size
130	*/
131	m = m_get(M_WAIT, MT_SOOPTS);
132	if (m == NULL) {
133	error = ENOBUFS;
134	goto out;
135	} else {
136	maxbuf = M_RCVBUF;
137	sopt.sopt_val = &maxbuf;
138	sopt.sopt_valsize = sizeof(maxbuf);
139	sopt.sopt_level = SOL_SOCKET;
140	sopt.sopt_name = SO_RCVBUF;
141	sopt.sopt_dir = SOPT_SET;
0b4e3aa0	142	sopt.sopt_p = NULL;
1c79356b A	143	if ((error = sosetopt(so, &sopt)) != 0)
	144	goto out;
	145	}
	146
	147	/*
	148	* Set socket Send buffer size
	149	*/
	150	m = m_get(M_WAIT, MT_SOOPTS);
	151	if (m == NULL) {
	152	error = ENOBUFS;
	153	goto out;
	154	} else {
	155
	156	maxbuf = M_SNDBUF;
	157	sopt.sopt_val = &maxbuf;
	158	sopt.sopt_valsize = sizeof(maxbuf);
	159	sopt.sopt_level = SOL_SOCKET;
	160	sopt.sopt_name = SO_SNDBUF;
	161	sopt.sopt_dir = SOPT_SET;
0b4e3aa0	162	sopt.sopt_p = NULL;
1c79356b A	163	if ((error = sosetopt(so, &sopt)) != 0)
	164	goto out;
	165	}
	166
	167	so->so_upcall = aurp_wakeup;
	168	so->so_upcallarg = (caddr_t)AE_UDPIP; /* Yuck */
	169	so->so_state \|= SS_NBIO;
0b4e3aa0 A	170	so->so_rcv.sb_flags \|=(SB_SEL\|SB_NOINTR);
0b4e3aa0 A	171	so->so_snd.sb_flags \|=(SB_SEL\|SB_NOINTR);
1c79356b A	172
	173	out:
	174	sbunlock(&so->so_snd);
	175	sbunlock(&so->so_rcv);
	176
	177	return(error);
	178	}
	179
	180	int
	181	AURPgetmsg(err)
	182	int *err;
	183	{ register struct socket *so;
	184	register int s, events;
	185
	186	so = aurp_global.tunnel;
	187	*err = 0;
	188
	189	for (;;)
	190	{ gbuf_t from, p_mbuf;
	191	int flags = MSG_DONTWAIT;
	192	struct uio auio;
	193
	194	/*
	195	* Wait for a package to arrive. This will be from the
	196	* IP side - sowakeup() calls aurp_wakeup()
	197	* when a packet arrives
	198	*/
	199
	200	ATDISABLE(s, aurp_global.glock);
	201	events = aurp_global.event;
	202	if (((err == 0) \|\| (err == EWOULDBLOCK)) && events == 0)
	203	{
	204	*err = tsleep(&aurp_global.event_anchor, PSOCK \| PCATCH, "AURPgetmsg", 0);
	205	events = aurp_global.event;
	206	aurp_global.event = 0;
	207	}
	208	ATENABLE(s, aurp_global.glock);
	209
	210	/*
	211	* Shut down if we have the AE_SHUTDOWN event or if we got
	212	* a system error other than EWOULDBLOCK, such as EINTR.
	213	*/
	214	if (((err != EWOULDBLOCK) && (err != 0)) \|\| events & AE_SHUTDOWN)
	215	{
	216	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	217	("AURPgetmsg: AE_SHUTDOWN detected--starting shutdown sequence\n"));
	218	aurp_global.shutdown = 1;
	219	while (aurp_global.running)
	220	;
	221	/lock_free(&aurp_global.glock);/
	222	aurp_global.tunnel = 0;
	223	aurp_global.event = 0;
	224	aurp_global.shutdown = 0;
	225	soclose(so);
	226	if (*err == 0)
	227	*err = ESHUTDOWN;
	228	dPrintf(D_M_AURP, D_L_SHUTDN_INFO,
	229	("AURPgetmsg: shutdown completed\n"));
	230	return -1;
	231	}
	232
	233
	234
	235	/*
236	* Set up the nominal uio structure -
237	* give it no iov's, point off to non-existant user space,
238	* but make sure the 'resid' count means somehting.
239	*/
240
241	auio.uio_iov = NULL;
242	auio.uio_iovcnt = 0;
243	auio.uio_segflg = UIO_SYSSPACE;
244	auio.uio_offset = 0; /* XXX */
245
246	/* Keep up an even flow... */
247	for (;;)
248	{
249	/*
250	* This should be large enough to encompass a full DDP packet plus
251	* domain header.
252	*/
253	#define A_LARGE_SIZE 700
254
255	flags = MSG_DONTWAIT;
256	auio.uio_resid = A_LARGE_SIZE;
257	err = soreceive(so, (struct sockaddr *)&from, &auio, &p_mbuf, 0, &flags);
258	dPrintf(D_M_AURP, D_L_VERBOSE,
259	("AURPgetmsg: soreceive returned %d, aurp_global.event==0x%x\n", *err, events));
260	/* soreceive() sets mp to zero! at start /
261	if (p_mbuf)
55e303ae	262	ip_to_atalk((struct sockaddr_in *)from, p_mbuf);
1c79356b A	263	if (*err \|\| (p_mbuf == NULL)) {
	264	/*
	265	* An error occurred in soreceive(),
	266	* so clear the data input event flag
	267	* and break out of this inner loop.
	268	*
	269	* XXX Note that clearing AE_UDPIP here could
	270	* cause us to lose an AE_UDPIP event that
	271	* was posted in aurp_global.event between
	272	* the soreceive() above and the code here.
	273	* The protocol should recover from this
	274	* lost event, though, since the next
	275	* request (a tickle, for example) from
	276	* the other end of the tunnel will cause
	277	* another AE_UDPIP event to be posted,
	278	* which will wake us from the sleep at
	279	* the top of the outer loop.
	280	*/
	281	int s;
	282	ATDISABLE(s, aurp_global.glock);
	283	aurp_global.event &= ~AE_UDPIP;
	284	ATENABLE(s, aurp_global.glock);
	285	dPrintf(D_M_AURP, D_L_WARNING, ("AURPgetmsg: spurious soreceive, err==%d, p_mbuf==0x%x\n", *err, (unsigned int) p_mbuf));
	286	break;
	287	}
	288	}
	289	}
	290	return -1;
	291	}
	292
	293	/*
	294	* Wakeup the sleeping giant - we've put a message on his queue(s).
	295	* The arg indicates what queue has been updated.
	296	*
	297	* This conforms to the so_upcall function pointer member of struct sockbuf.
	298	*/
	299	void aurp_wakeup(struct socket *so, register caddr_t p, int state)
	300	{
	301	register int s;
	302	register int bit;
	303
	304	bit = (int) p;
	305	ATDISABLE(s, aurp_global.glock);
	306	aurp_global.event \|= bit;
	307	ATENABLE(s, aurp_global.glock);
	308
	309	dPrintf(D_M_AURP, D_L_STATE_CHG,
	310	("aurp_wakeup: bit 0x%x, aurp_global.event now 0x%x\n",
	311	bit, aurp_global.event));
	312
9bccf70c	313	wakeup(&aurp_global.event_anchor);
1c79356b A	314	}
	315
	316	/*
	317	* Try to bind to the specified reserved port.
	318	* Sort of like sobind(), but no suser() check.
	319	*/
	320	static int
	321	aurp_bindrp(struct socket *so)
	322	{
	323	struct sockaddr_in sin;
	324	struct proc *p = current_proc();
	325	gbuf_t *m;
	326	int error;
	327
	328
	329	bzero(&sin, sizeof(sin));
	330	sin.sin_family = AF_INET;
	331	sin.sin_addr.s_addr = htons(aurp_global.src_addr);
	332	sin.sin_port = htons(aurp_global.udp_port);
	333	sin.sin_len = sizeof(struct sockaddr_in);
	334
	335	sblock(&so->so_rcv, M_WAIT);
	336	sblock(&so->so_snd, M_WAIT);
	337	so->so_state \|= SS_PRIV;
	338	error = (so->so_proto->pr_usrreqs->pru_bind)(so, (struct sockaddr ) &sin, p);
	339	sbunlock(&so->so_snd);
	340	sbunlock(&so->so_rcv);
	341
	342	return (error);
	343	}
	344
	345	/*
	346	* receive from UDP
	347	* fp is the 'source address' mbuf; p_mbuf is the data mbuf.
	348	* Use the source address to find the 'node number' (index of the address),
	349	* and pass that to the next stage.
	350	*/
	351	int ip_to_atalk(register struct sockaddr_in rem_addr, register gbuf_t p_mbuf)
	352	{
	353	register aurp_domain_t *domain;
	354	unsigned char node;
	355
	356
	357	/* determine the node where the packet came from */
	358	for (node=1; node <= dst_addr_cnt; node++) {
	359	if (aurp_global.dst_addr[node] == (long )&rem_addr->sin_addr)
	360	break;
	361	}
	362	if (node > dst_addr_cnt) {
	363	dPrintf(D_M_AURP, D_L_WARNING,
	364	("AURPrecv: invalid node, %d.%lx\n",
	365	rem_addr->sin_port,
	366	rem_addr->sin_addr.s_addr));
	367
	368	gbuf_freem(p_mbuf);
	369	FREE(rem_addr, M_SONAME);
	370	return -1;
	371	}
	372
	373	/* validate the domain */
	374	domain = (aurp_domain_t *)gbuf_rptr(p_mbuf);
	375	if ( (domain->dst_length != IP_LENGTH) \|\|
	376	(domain->dst_authority != IP_AUTHORITY) \|\|
	377	(domain->version != AUD_Version) \|\|
378	((domain->type != AUD_Atalk) && (domain->type != AUD_AURP)) ) {
379	dPrintf(D_M_AURP, D_L_WARNING,
380	("AURPrecv: invalid domain, %d.%lx\n",
381	rem_addr->sin_port,
382	rem_addr->sin_addr.s_addr));
383
384	gbuf_freem(p_mbuf);
385	FREE(rem_addr, M_SONAME);
386	return -1;
387	}
388
389	/* Remove domain header */
390	p_mbuf->m_pkthdr.len -= IP_DOMAINSIZE;
391	gbuf_rinc(p_mbuf,IP_DOMAINSIZE);
392	gbuf_set_type(p_mbuf, MSG_DATA);
393
394	/* forward the packet to the local AppleTalk stack */
395
396	at_insert(p_mbuf, domain->type, node);
397	FREE(rem_addr, M_SONAME);
398	return 0;
399	}
400
401	/*
402	* send to UDP
403	* The real work has been done already. Here, we just cobble together
404	* a sockaddr for the destination and call sosend().
405	*/
406	void
407	atalk_to_ip(register gbuf_t *m)
408	{ register aurp_domain_t *domain;
409	int error;
410	int flags = MSG_DONTWAIT;
411	struct sockaddr_in rem_addr;
412	int s;
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