[apple/xnu.git] / bsd / netat / adsp.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@
 */
/*
 * Change log:
 *   06/29/95 - Modified to handle flow control for writing (Tuyen Nguyen)
 *    Modified for MP, 1996 by Tuyen Nguyen
 *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
 */
#define RESOLVE_DBG
#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 <netat/sysglue.h>
#include <netat/appletalk.h>
#include <netat/at_pcb.h>
#include <netat/ddp.h>
#include <netat/adsp.h>
#include <netat/adsp_internal.h>

#ifdef notdefn
struct adsp_debug adsp_dtable[1025];
int ad_entry = 0;
#endif

extern atlock_t adspgen_lock;

adspAllocateCCB(gref)
    register gref_t *gref;	/* READ queue */
{
    gbuf_t *ccb_mp;
    register CCBPtr sp;

    if (!(ccb_mp = gbuf_alloc(sizeof(CCB), PRI_LO))) {
        return (0);
    }
    bzero((caddr_t) gbuf_rptr(ccb_mp), sizeof(CCB));
    gbuf_wset(ccb_mp,sizeof(CCB));
    gref->info = (caddr_t) ccb_mp;
    sp = (CCBPtr)gbuf_rptr(((gbuf_t *)gref->info));

    sp->pid = gref->pid; /* save the caller process pointer */
    sp->gref = gref;		/* save a back pointer to the WRITE queue */
    sp->sp_mp = ccb_mp;		/* and its message block */
    ATLOCKINIT(sp->lock);
    ATLOCKINIT(sp->lockClose);
    ATLOCKINIT(sp->lockRemove);
    return 1;
}

adspRelease(gref)
    register gref_t *gref;	/* READ queue */
{
    register CCBPtr sp;
    int s, l;

    ATDISABLE(l, adspgen_lock);
    if (gref->info) {
	sp = (CCBPtr)gbuf_rptr(((gbuf_t *)gref->info));
	ATDISABLE(s, sp->lock);
	ATENABLE(s, adspgen_lock);
				/* Tells completion routine of close */
				/* packet to remove us. */

	if (sp->state == sPassive || sp->state == sClosed || 
	    sp->state == sOpening || sp->state == sListening) {
	    ATENABLE(l, sp->lock);
	    if (sp->state == sListening)
		CompleteQueue(&sp->opb, errAborted);
	    sp->removing = 1;	/* Prevent allowing another dspClose. */
	    DoClose(sp, errAborted, 0); /* will remove CCB */
	    return 0;
	} else {			/* sClosing & sOpen */
	    sp->state = sClosing;
	}
	ATENABLE(l, sp->lock);

	if (CheckOkToClose(sp)) { /* going to close */
	    sp->sendCtl = B_CTL_CLOSE; /* Send close advice */
	} else {
		CheckSend(sp);	/* try one more time to send out data */
		if (sp->state != sClosed)
		    sp->sendCtl = B_CTL_CLOSE; /* Setup to send close advice */
	}
	CheckSend(sp);		/* and force out the close */
	ATDISABLE(s, sp->lock);
	    sp->removing = 1;	/* Prevent allowing another dspClose. */
	    sp->state = sClosed;
	ATENABLE(s, sp->lock);
	    DoClose(sp, errAborted, 0);  /* to closed and remove CCB */
    } else
	ATENABLE(l, adspgen_lock);
}


adspWriteHandler(gref, mp)
    gref_t *gref;			/* WRITE queue */
    gbuf_t *mp;
{

    register ioc_t *iocbp;
    register struct adspcmd *ap;
    int error, flag;
	void *sp;

    switch(gbuf_type(mp)) {
    case MSG_DATA:
	if (gref->info == 0) {
	    gbuf_freem(mp);
	    return(STR_IGNORE);
        }
	/*
	 * Fill in the global stuff
	 */
	ap = (struct adspcmd *)gbuf_rptr(mp);
	ap->gref = gref;
	ap->ioc = 0;
	ap->mp = mp;
	sp = (void *)gbuf_rptr(((gbuf_t *)gref->info));
	switch(ap->csCode) {
	case dspWrite:
	    if ((error = adspWrite(sp, ap)))
		gbuf_freem(mp);
	    return(STR_IGNORE);
	case dspAttention:
	    if ((error = adspAttention(sp, ap)))
		gbuf_freem(mp);
	    return(STR_IGNORE);
	}
    case MSG_IOCTL:
	if (gref->info == 0) {
	    adspioc_ack(EPROTO, mp, gref);
	    return(STR_IGNORE);
        }
	iocbp = (ioc_t *) gbuf_rptr(mp);
	if (ADSP_IOCTL(iocbp->ioc_cmd)) {
	    iocbp->ioc_count = sizeof(*ap) - 1;
	    if (gbuf_cont(mp) == 0) {
		adspioc_ack(EINVAL, mp, gref);
		return(STR_IGNORE);
	    }
	    ap = (struct adspcmd *) gbuf_rptr(gbuf_cont(mp));
	    ap->gref = gref;
	    ap->ioc = (caddr_t) mp;
	    ap->mp = gbuf_cont(mp); /* request head */
	    ap->ioResult = 0;

	    if ((gref->info == 0) && ((iocbp->ioc_cmd != ADSPOPEN) &&
			            (iocbp->ioc_cmd != ADSPCLLISTEN))) {
	        ap->ioResult = errState;

		adspioc_ack(EINVAL, mp, gref);
		return(STR_IGNORE);
	    }
	}	
	sp = (void *)gbuf_rptr(((gbuf_t *)gref->info));
	switch(iocbp->ioc_cmd) {
	case ADSPOPEN:
	case ADSPCLLISTEN:
		ap->socket = ((CCBPtr)sp)->localSocket;
		flag = (adspMode(ap) == ocAccept) ? 1 : 0;
		if (flag && ap->socket) {
			if (adspDeassignSocket((CCBPtr)sp) >= 0)
				ap->socket = 0;
		}
		if ((ap->socket == 0) &&
		    ((ap->socket = 
		      (at_socket)adspAssignSocket(gref, flag)) == 0)) {
		    adspioc_ack(EADDRNOTAVAIL, mp, gref);
	        return(STR_IGNORE);
		}
	    ap->csCode = iocbp->ioc_cmd == ADSPOPEN ? dspInit : dspCLInit;
	    if ((error = adspInit(sp, ap)) == 0) {
		switch(ap->csCode) {
		case dspInit:
		    /* and open the connection */
		    ap->csCode = dspOpen;
		    error = adspOpen(sp, ap);
		    break;
		case dspCLInit:
		    /* ADSPCLLISTEN */
		    ap->csCode = dspCLListen;
		    error = adspCLListen(sp, ap);
		    break;
		}
	    }
	    if (error) 
		adspioc_ack(error, mp, gref); /* if this failed req complete */
	    return(STR_IGNORE);
	case ADSPCLOSE:
	    ap->csCode = dspClose;
	    if ((error = adspClose(sp, ap))) {
		adspioc_ack(error, mp, gref);
		break;
	    }
	    break;
	case ADSPCLREMOVE:
	    ap->csCode = dspCLRemove;
	    error = adspClose(sp, ap);
	    adspioc_ack(error, mp, gref);
	    return(STR_IGNORE);
	case ADSPCLDENY:
	    ap->csCode = dspCLDeny;
	    if ((error = adspCLDeny(sp, ap))) {
		adspioc_ack(error, mp, gref);
	    }
	    return(STR_IGNORE);
	case ADSPSTATUS:
	    ap->csCode = dspStatus;
	    if ((error = adspStatus(sp, ap))) {
		adspioc_ack(error, mp, gref);
	    }
	    return(STR_IGNORE);
	case ADSPREAD:
	    ap->csCode = dspRead;
	    if ((error = adspRead(sp, ap))) {
		adspioc_ack(error, mp, gref);
	    }
	    return(STR_IGNORE);
	case ADSPATTENTION:
	    ap->csCode = dspAttention;
	    if ((error = adspReadAttention(sp, ap))) {
		adspioc_ack(error, mp, gref);
	    }
	    return(STR_IGNORE);
	case ADSPOPTIONS:
	    ap->csCode = dspOptions;
	    if ((error = adspOptions(sp, ap))) {
		adspioc_ack(error, mp, gref);
	    }
	    return(STR_IGNORE);
	case ADSPRESET:
	    ap->csCode = dspReset;
	    if ((error = adspReset(sp, ap))) {
		adspioc_ack(error, mp, gref);
	    }
	    return(STR_IGNORE);
	case ADSPNEWCID:
	    ap->csCode = dspNewCID;
	    if ((error = adspNewCID(sp, ap))) {
		adspioc_ack(error, mp, gref);
	    }
	    return(STR_IGNORE);
	default:
	    return(STR_PUTNEXT);	/* pass it on down */
	}
	return(STR_IGNORE);
    case MSG_PROTO:
    default:
	gbuf_freem(mp);
    }
}


adspReadHandler(gref, mp)
    gref_t *gref;
    gbuf_t *mp;
{
    int error;

    switch(gbuf_type(mp)) {
    case MSG_DATA:
	if ((error = adspPacket(gref, mp))) {
	    gbuf_freem(mp);
	}
	break;
	
    case MSG_IOCTL:
    default:
	return(STR_PUTNEXT);
	break;
    }
    return(STR_IGNORE);
}

/*
 * adsp_sendddp()
 *
 * Description:
 *      This procedure a formats a DDP datagram header and calls the
 *      DDP module to queue it for routing and transmission according to
 *      the DDP parameters.  We always take control of the datagram;
 *      if there is an error we free it, otherwise we pass it to the next
 *      layer.  We don't need to set the src address fileds because the
 *      DDP layer fills these in for us.
 *
 * Calling Sequence:
 *      ret_status = adsp_sendddp(q, sp, mp, length, dstnetaddr, ddptype);
 *
 * Formal Parameters:
 *	sp		Caller stream pointer
 *      mp              gbuf_t chain containing the datagram to transmit
 *			The first mblk contains the ADSP header and space
 *			for the DDP header.
 *      length          size of data portion of datagram
 *      dstnetaddr      address of 4-byte destination internet address
 *      ddptype         DDP protocol to assign to the datagram
 *
 * Completion Status:
 *      0               Procedure successful completed.
 *      EMSGSIZE        Specified datagram length is too big.
 *
 * Side Effects:
 *      NONE
 */

adsp_sendddp(sp, mp, length, dstnetaddr, ddptype)
   CCBPtr sp;
   gbuf_t *mp;
   int length;
   AddrUnion *dstnetaddr;
   int ddptype;
{
   DDPX_FRAME   *ddp;
   gbuf_t *mlist = mp;

   if (mp == 0)
       return EINVAL;

   if (length > DDP_DATA_SIZE) {
       gbuf_freel(mlist);
       return EMSGSIZE;
   }

  while (mp) {

   if (length == 0)
       length = gbuf_msgsize(mp) - DDPL_FRAME_LEN;
   /* Set up the DDP header */

   ddp = (DDPX_FRAME *) gbuf_rptr(mp);
   UAS_ASSIGN(ddp->ddpx_length, (length + DDPL_FRAME_LEN));
   UAS_ASSIGN(ddp->ddpx_cksm, 0);
   if (sp) {
	if (sp->useCheckSum)
	   UAS_ASSIGN(ddp->ddpx_cksm, 1);
   }

   NET_ASSIGN(ddp->ddpx_dnet, dstnetaddr->a.net);
   ddp->ddpx_dnode = dstnetaddr->a.node;
   ddp->ddpx_source = sp ? sp->localSocket : ddp->ddpx_dest;
   ddp->ddpx_dest = dstnetaddr->a.socket;

   ddp->ddpx_type = ddptype;
   length = 0;
   mp = gbuf_next(mp);

  }
	   
   DDP_OUTPUT(mlist);
   return 0;
}

void NotifyUser(sp)
    register CCBPtr sp;

{
/*
    pidsig(sp->pid, SIGIO);
*/
}

void UrgentUser(sp)
    register CCBPtr sp;
{
/*
    pidsig(sp->pid, SIGURG);
*/
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 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	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 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,
de355530 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	* Change log:
	24	* 06/29/95 - Modified to handle flow control for writing (Tuyen Nguyen)
	25	* Modified for MP, 1996 by Tuyen Nguyen
	26	* Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
	27	*/
	28	#define RESOLVE_DBG
	29	#include <sys/errno.h>
	30	#include <sys/types.h>
	31	#include <sys/param.h>
	32	#include <machine/spl.h>
	33	#include <sys/systm.h>
	34	#include <sys/kernel.h>
	35	#include <sys/proc.h>
	36	#include <sys/filedesc.h>
	37	#include <sys/fcntl.h>
	38	#include <sys/mbuf.h>
	39	#include <sys/socket.h>
	40
	41	#include <netat/sysglue.h>
	42	#include <netat/appletalk.h>
	43	#include <netat/at_pcb.h>
	44	#include <netat/ddp.h>
	45	#include <netat/adsp.h>
	46	#include <netat/adsp_internal.h>
	47
	48	#ifdef notdefn
	49	struct adsp_debug adsp_dtable[1025];
	50	int ad_entry = 0;
	51	#endif
	52
	53	extern atlock_t adspgen_lock;
	54
	55	adspAllocateCCB(gref)
	56	register gref_t gref; / READ queue */
	57	{
	58	gbuf_t *ccb_mp;
	59	register CCBPtr sp;
	60
	61	if (!(ccb_mp = gbuf_alloc(sizeof(CCB), PRI_LO))) {
	62	return (0);
	63	}
	64	bzero((caddr_t) gbuf_rptr(ccb_mp), sizeof(CCB));
	65	gbuf_wset(ccb_mp,sizeof(CCB));
	66	gref->info = (caddr_t) ccb_mp;
	67	sp = (CCBPtr)gbuf_rptr(((gbuf_t *)gref->info));
	68
	69	sp->pid = gref->pid; /* save the caller process pointer */
	70	sp->gref = gref; /* save a back pointer to the WRITE queue */
	71	sp->sp_mp = ccb_mp; /* and its message block */
	72	ATLOCKINIT(sp->lock);
	73	ATLOCKINIT(sp->lockClose);
	74	ATLOCKINIT(sp->lockRemove);
	75	return 1;
	76	}
	77
	78	adspRelease(gref)
	79	register gref_t gref; / READ queue */
	80	{
	81	register CCBPtr sp;
	82	int s, l;
83
84	ATDISABLE(l, adspgen_lock);
85	if (gref->info) {
86	sp = (CCBPtr)gbuf_rptr(((gbuf_t *)gref->info));
87	ATDISABLE(s, sp->lock);
88	ATENABLE(s, adspgen_lock);
89	/* Tells completion routine of close */
90	/* packet to remove us. */
91
92	if (sp->state == sPassive \|\| sp->state == sClosed \|\|
93	sp->state == sOpening \|\| sp->state == sListening) {
94	ATENABLE(l, sp->lock);
95	if (sp->state == sListening)
96	CompleteQueue(&sp->opb, errAborted);
97	sp->removing = 1; /* Prevent allowing another dspClose. */
98	DoClose(sp, errAborted, 0); /* will remove CCB */
99	return 0;
100	} else { /* sClosing & sOpen */
101	sp->state = sClosing;
102	}
103	ATENABLE(l, sp->lock);
104
105	if (CheckOkToClose(sp)) { /* going to close */
106	sp->sendCtl = B_CTL_CLOSE; /* Send close advice */
107	} else {
108	CheckSend(sp); /* try one more time to send out data */
109	if (sp->state != sClosed)
110	sp->sendCtl = B_CTL_CLOSE; /* Setup to send close advice */
111	}
112	CheckSend(sp); /* and force out the close */
113	ATDISABLE(s, sp->lock);
114	sp->removing = 1; /* Prevent allowing another dspClose. */
115	sp->state = sClosed;
116	ATENABLE(s, sp->lock);
117	DoClose(sp, errAborted, 0); /* to closed and remove CCB */
118	} else
119	ATENABLE(l, adspgen_lock);
120	}
121
122
123
124
125	adspWriteHandler(gref, mp)
126	gref_t gref; / WRITE queue */
127	gbuf_t *mp;
128	{
129
130	register ioc_t *iocbp;
131	register struct adspcmd *ap;
132	int error, flag;
133	void *sp;
134
135	switch(gbuf_type(mp)) {
136	case MSG_DATA:
137	if (gref->info == 0) {
138	gbuf_freem(mp);
139	return(STR_IGNORE);
140	}
141	/*
142	* Fill in the global stuff
143	*/
144	ap = (struct adspcmd *)gbuf_rptr(mp);
145	ap->gref = gref;
146	ap->ioc = 0;
147	ap->mp = mp;
148	sp = (void )gbuf_rptr(((gbuf_t )gref->info));
149	switch(ap->csCode) {
150	case dspWrite:
151	if ((error = adspWrite(sp, ap)))
152	gbuf_freem(mp);
153	return(STR_IGNORE);
154	case dspAttention:
155	if ((error = adspAttention(sp, ap)))
156	gbuf_freem(mp);
157	return(STR_IGNORE);
158	}
159	case MSG_IOCTL:
160	if (gref->info == 0) {
161	adspioc_ack(EPROTO, mp, gref);
162	return(STR_IGNORE);
163	}
164	iocbp = (ioc_t *) gbuf_rptr(mp);
165	if (ADSP_IOCTL(iocbp->ioc_cmd)) {
166	iocbp->ioc_count = sizeof(*ap) - 1;
167	if (gbuf_cont(mp) == 0) {
168	adspioc_ack(EINVAL, mp, gref);
169	return(STR_IGNORE);
170	}
171	ap = (struct adspcmd *) gbuf_rptr(gbuf_cont(mp));
172	ap->gref = gref;
173	ap->ioc = (caddr_t) mp;
174	ap->mp = gbuf_cont(mp); /* request head */
175	ap->ioResult = 0;
176
177	if ((gref->info == 0) && ((iocbp->ioc_cmd != ADSPOPEN) &&
178	(iocbp->ioc_cmd != ADSPCLLISTEN))) {
179	ap->ioResult = errState;
180
181	adspioc_ack(EINVAL, mp, gref);
182	return(STR_IGNORE);
183	}
184	}
185	sp = (void )gbuf_rptr(((gbuf_t )gref->info));
186	switch(iocbp->ioc_cmd) {
187	case ADSPOPEN:
188	case ADSPCLLISTEN:
189	ap->socket = ((CCBPtr)sp)->localSocket;
190	flag = (adspMode(ap) == ocAccept) ? 1 : 0;
191	if (flag && ap->socket) {
192	if (adspDeassignSocket((CCBPtr)sp) >= 0)
193	ap->socket = 0;
194	}
195	if ((ap->socket == 0) &&
196	((ap->socket =
197	(at_socket)adspAssignSocket(gref, flag)) == 0)) {
198	adspioc_ack(EADDRNOTAVAIL, mp, gref);
199	return(STR_IGNORE);
200	}
201	ap->csCode = iocbp->ioc_cmd == ADSPOPEN ? dspInit : dspCLInit;
202	if ((error = adspInit(sp, ap)) == 0) {
203	switch(ap->csCode) {
204	case dspInit:
205	/* and open the connection */
206	ap->csCode = dspOpen;
207	error = adspOpen(sp, ap);
208	break;
209	case dspCLInit:
210	/* ADSPCLLISTEN */
211	ap->csCode = dspCLListen;
212	error = adspCLListen(sp, ap);
213	break;
214	}
215	}
216	if (error)
217	adspioc_ack(error, mp, gref); /* if this failed req complete */
218	return(STR_IGNORE);
219	case ADSPCLOSE:
220	ap->csCode = dspClose;
221	if ((error = adspClose(sp, ap))) {
222	adspioc_ack(error, mp, gref);
223	break;
224	}
225	break;
226	case ADSPCLREMOVE:
227	ap->csCode = dspCLRemove;
228	error = adspClose(sp, ap);
229	adspioc_ack(error, mp, gref);
230	return(STR_IGNORE);
231	case ADSPCLDENY:
232	ap->csCode = dspCLDeny;
233	if ((error = adspCLDeny(sp, ap))) {
234	adspioc_ack(error, mp, gref);
235	}
236	return(STR_IGNORE);
237	case ADSPSTATUS:
238	ap->csCode = dspStatus;
239	if ((error = adspStatus(sp, ap))) {
240	adspioc_ack(error, mp, gref);
241	}
242	return(STR_IGNORE);
243	case ADSPREAD:
244	ap->csCode = dspRead;
245	if ((error = adspRead(sp, ap))) {
246	adspioc_ack(error, mp, gref);
247	}
248	return(STR_IGNORE);
249	case ADSPATTENTION:
250	ap->csCode = dspAttention;
251	if ((error = adspReadAttention(sp, ap))) {
252	adspioc_ack(error, mp, gref);
253	}
254	return(STR_IGNORE);
255	case ADSPOPTIONS:
256	ap->csCode = dspOptions;
257	if ((error = adspOptions(sp, ap))) {
258	adspioc_ack(error, mp, gref);
259	}
260	return(STR_IGNORE);
261	case ADSPRESET:
262	ap->csCode = dspReset;
263	if ((error = adspReset(sp, ap))) {
264	adspioc_ack(error, mp, gref);
265	}
266	return(STR_IGNORE);
267	case ADSPNEWCID:
268	ap->csCode = dspNewCID;
269	if ((error = adspNewCID(sp, ap))) {
270	adspioc_ack(error, mp, gref);
271	}
272	return(STR_IGNORE);
273	default:
274	return(STR_PUTNEXT); /* pass it on down */
275	}
276	return(STR_IGNORE);
277	case MSG_PROTO:
278	default:
279	gbuf_freem(mp);
280	}
281	}
282
283
284	adspReadHandler(gref, mp)
285	gref_t *gref;
286	gbuf_t *mp;
287	{
288	int error;
289
290	switch(gbuf_type(mp)) {
291	case MSG_DATA:
292	if ((error = adspPacket(gref, mp))) {
293	gbuf_freem(mp);
294	}
295	break;
296
297	case MSG_IOCTL:
298	default:
299	return(STR_PUTNEXT);
300	break;
301	}
302	return(STR_IGNORE);
303	}
304
305	/*
306	* adsp_sendddp()
307	*
308	* Description:
309	* This procedure a formats a DDP datagram header and calls the
310	* DDP module to queue it for routing and transmission according to
311	* the DDP parameters. We always take control of the datagram;
312	* if there is an error we free it, otherwise we pass it to the next
313	* layer. We don't need to set the src address fileds because the
314	* DDP layer fills these in for us.
315	*
316	* Calling Sequence:
317	* ret_status = adsp_sendddp(q, sp, mp, length, dstnetaddr, ddptype);
318	*
319	* Formal Parameters:
320	* sp Caller stream pointer
321	* mp gbuf_t chain containing the datagram to transmit
322	* The first mblk contains the ADSP header and space
323	* for the DDP header.
324	* length size of data portion of datagram
325	* dstnetaddr address of 4-byte destination internet address
326	* ddptype DDP protocol to assign to the datagram
327	*
328	* Completion Status:
329	* 0 Procedure successful completed.
330	* EMSGSIZE Specified datagram length is too big.
331	*
332	* Side Effects:
333	* NONE
334	*/
335
336	adsp_sendddp(sp, mp, length, dstnetaddr, ddptype)
337	CCBPtr sp;
338	gbuf_t *mp;
339	int length;
340	AddrUnion *dstnetaddr;
341	int ddptype;
342	{
343	DDPX_FRAME *ddp;
344	gbuf_t *mlist = mp;
345
346	if (mp == 0)
347	return EINVAL;
348
349	if (length > DDP_DATA_SIZE) {
350	gbuf_freel(mlist);
351	return EMSGSIZE;
352	}
353
354	while (mp) {
355
356	if (length == 0)
357	length = gbuf_msgsize(mp) - DDPL_FRAME_LEN;
358	/* Set up the DDP header */
359
360	ddp = (DDPX_FRAME *) gbuf_rptr(mp);
361	UAS_ASSIGN(ddp->ddpx_length, (length + DDPL_FRAME_LEN));
362	UAS_ASSIGN(ddp->ddpx_cksm, 0);
363	if (sp) {
364	if (sp->useCheckSum)
365	UAS_ASSIGN(ddp->ddpx_cksm, 1);
366	}
367
368	NET_ASSIGN(ddp->ddpx_dnet, dstnetaddr->a.net);
369	ddp->ddpx_dnode = dstnetaddr->a.node;
370	ddp->ddpx_source = sp ? sp->localSocket : ddp->ddpx_dest;
371	ddp->ddpx_dest = dstnetaddr->a.socket;
372
373	ddp->ddpx_type = ddptype;
374	length = 0;
375	mp = gbuf_next(mp);
376
377	}
378
379	DDP_OUTPUT(mlist);
380	return 0;
381	}
382
383	void NotifyUser(sp)
384	register CCBPtr sp;
385
386	{
387	/*
388	pidsig(sp->pid, SIGIO);
389	*/
390	}
391
392	void UrgentUser(sp)
393	register CCBPtr sp;
394	{
395	/*
396	pidsig(sp->pid, SIGURG);
397	*/
398	}