413 lines
9.7 KiB
C
413 lines
9.7 KiB
C
/*
|
|
*
|
|
* ===================================
|
|
* HARP | Host ATM Research Platform
|
|
* ===================================
|
|
*
|
|
*
|
|
* This Host ATM Research Platform ("HARP") file (the "Software") is
|
|
* made available by Network Computing Services, Inc. ("NetworkCS")
|
|
* "AS IS". NetworkCS does not provide maintenance, improvements or
|
|
* support of any kind.
|
|
*
|
|
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
|
|
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
|
|
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
|
|
* In no event shall NetworkCS be responsible for any damages, including
|
|
* but not limited to consequential damages, arising from or relating to
|
|
* any use of the Software or related support.
|
|
*
|
|
* Copyright 1994-1998 Network Computing Services, Inc.
|
|
*
|
|
* Copies of this Software may be made, however, the above copyright
|
|
* notice must be reproduced on all copies.
|
|
*
|
|
* @(#) $Id: sscop_upper.c,v 1.2 1998/09/17 09:35:01 phk Exp $
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* ATM Forum UNI Support
|
|
* ---------------------
|
|
*
|
|
* SSCOP - CPCS SAP interface processing
|
|
*
|
|
*/
|
|
|
|
#include <netatm/kern_include.h>
|
|
|
|
#include <netatm/uni/uni.h>
|
|
#include <netatm/uni/sscop.h>
|
|
#include <netatm/uni/sscop_misc.h>
|
|
#include <netatm/uni/sscop_pdu.h>
|
|
#include <netatm/uni/sscop_var.h>
|
|
|
|
#ifndef lint
|
|
__RCSID("@(#) $Id: sscop_upper.c,v 1.2 1998/09/17 09:35:01 phk Exp $");
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Local functions
|
|
*/
|
|
static caddr_t sscop_pdu_receive __P((KBuffer *, struct sscop *, int *));
|
|
|
|
|
|
/*
|
|
* Local variables
|
|
*/
|
|
static union {
|
|
struct bgn_pdu t_bgn;
|
|
struct bgak_pdu t_bgak;
|
|
struct end_pdu t_end;
|
|
struct endak_q2110_pdu t_endak_q2110;
|
|
struct endak_qsaal_pdu t_endak_qsaal;
|
|
struct rs_pdu t_rs;
|
|
struct rsak_q2110_pdu t_rsak_q2110;
|
|
struct rsak_qsaal_pdu t_rsak_qsaal;
|
|
struct bgrej_pdu t_bgrej;
|
|
struct sd_pdu t_sd;
|
|
struct sdp_pdu t_sdp;
|
|
struct er_pdu t_er;
|
|
struct poll_pdu t_poll;
|
|
struct stat_pdu t_stat;
|
|
struct ustat_pdu t_ustat;
|
|
struct ud_pdu t_ud;
|
|
struct md_pdu t_md;
|
|
struct erak_pdu t_erak;
|
|
} sscop_trailer;
|
|
|
|
|
|
/*
|
|
* PDU length validation table
|
|
*/
|
|
struct pdulen {
|
|
int min;
|
|
int max;
|
|
};
|
|
|
|
static struct pdulen qsaal_pdulen[] = {
|
|
{0, 0},
|
|
{sizeof(struct bgn_pdu), sizeof(struct bgn_pdu)},
|
|
{sizeof(struct bgak_pdu), sizeof(struct bgak_pdu)},
|
|
{sizeof(struct end_pdu), sizeof(struct end_pdu)},
|
|
{sizeof(struct endak_qsaal_pdu),sizeof(struct endak_qsaal_pdu)},
|
|
{sizeof(struct rs_pdu), sizeof(struct rs_pdu)},
|
|
{sizeof(struct rsak_qsaal_pdu), sizeof(struct rsak_qsaal_pdu)},
|
|
{sizeof(struct bgrej_pdu), sizeof(struct bgrej_pdu)},
|
|
{sizeof(struct sd_pdu), sizeof(struct sd_pdu) + PDU_MAX_INFO},
|
|
{sizeof(struct sdp_pdu), sizeof(struct sdp_pdu) + PDU_MAX_INFO},
|
|
{sizeof(struct poll_pdu), sizeof(struct poll_pdu)},
|
|
{sizeof(struct stat_pdu), sizeof(struct stat_pdu) + PDU_MAX_STAT},
|
|
{sizeof(struct ustat_pdu), sizeof(struct ustat_pdu)},
|
|
{sizeof(struct ud_pdu), sizeof(struct ud_pdu) + PDU_MAX_INFO},
|
|
{sizeof(struct md_pdu), sizeof(struct md_pdu) + PDU_MAX_INFO},
|
|
{0, 0}
|
|
};
|
|
|
|
static struct pdulen q2110_pdulen[] = {
|
|
{0, 0},
|
|
{sizeof(struct bgn_pdu), sizeof(struct bgn_pdu) + PDU_MAX_UU},
|
|
{sizeof(struct bgak_pdu), sizeof(struct bgak_pdu) + PDU_MAX_UU},
|
|
{sizeof(struct end_pdu), sizeof(struct end_pdu) + PDU_MAX_UU},
|
|
{sizeof(struct endak_q2110_pdu),sizeof(struct endak_q2110_pdu)},
|
|
{sizeof(struct rs_pdu), sizeof(struct rs_pdu) + PDU_MAX_UU},
|
|
{sizeof(struct rsak_q2110_pdu), sizeof(struct rsak_q2110_pdu)},
|
|
{sizeof(struct bgrej_pdu), sizeof(struct bgrej_pdu) + PDU_MAX_UU},
|
|
{sizeof(struct sd_pdu), sizeof(struct sd_pdu) + PDU_MAX_INFO},
|
|
{sizeof(struct er_pdu), sizeof(struct er_pdu)},
|
|
{sizeof(struct poll_pdu), sizeof(struct poll_pdu)},
|
|
{sizeof(struct stat_pdu), sizeof(struct stat_pdu) + PDU_MAX_STAT},
|
|
{sizeof(struct ustat_pdu), sizeof(struct ustat_pdu)},
|
|
{sizeof(struct ud_pdu), sizeof(struct ud_pdu) + PDU_MAX_INFO},
|
|
{sizeof(struct md_pdu), sizeof(struct md_pdu) + PDU_MAX_INFO},
|
|
{sizeof(struct erak_pdu), sizeof(struct erak_pdu)}
|
|
};
|
|
|
|
|
|
/*
|
|
* PDUs with Pad Length Fields
|
|
*/
|
|
static u_char qsaal_padlen[] = {
|
|
0, /* --- */
|
|
0, /* BGN */
|
|
0, /* BGAK */
|
|
0, /* END */
|
|
0, /* ENDAK */
|
|
0, /* RS */
|
|
0, /* RSAK */
|
|
0, /* BGREJ */
|
|
1, /* SD */
|
|
1, /* SDP */
|
|
0, /* POLL */
|
|
0, /* STAT */
|
|
0, /* USTAT */
|
|
1, /* UD */
|
|
1, /* MD */
|
|
0 /* --- */
|
|
};
|
|
|
|
static u_char q2110_padlen[] = {
|
|
0, /* --- */
|
|
1, /* BGN */
|
|
1, /* BGAK */
|
|
1, /* END */
|
|
0, /* ENDAK */
|
|
1, /* RS */
|
|
0, /* RSAK */
|
|
1, /* BGREJ */
|
|
1, /* SD */
|
|
0, /* ER */
|
|
0, /* POLL */
|
|
0, /* STAT */
|
|
0, /* USTAT */
|
|
1, /* UD */
|
|
1, /* MD */
|
|
0 /* ERAK */
|
|
};
|
|
|
|
|
|
/*
|
|
* SSCOP Upper Stack Command Handler
|
|
*
|
|
* This function will receive all of the stack commands issued from the
|
|
* layer below SSCOP (ie. CPCS). Currently, only incoming PDUs will be
|
|
* received here. The appropriate processing function will be determined
|
|
* based on the received PDU type and the current sscop control block state.
|
|
*
|
|
* Arguments:
|
|
* cmd stack command code
|
|
* tok session token
|
|
* arg1 command specific argument
|
|
* arg2 command specific argument
|
|
*
|
|
* Returns:
|
|
* none
|
|
*
|
|
*/
|
|
void
|
|
sscop_upper(cmd, tok, arg1, arg2)
|
|
int cmd;
|
|
void *tok;
|
|
int arg1;
|
|
int arg2;
|
|
{
|
|
struct sscop *sop = (struct sscop *)tok;
|
|
void (**ptab) __P((struct sscop *, KBuffer *, caddr_t));
|
|
void (*func) __P((struct sscop *, KBuffer *, caddr_t));
|
|
caddr_t trlr;
|
|
int type;
|
|
|
|
ATM_DEBUG5("sscop_upper: cmd=0x%x, sop=%p, state=%d, arg1=0x%x, arg2=0x%x\n",
|
|
cmd, sop, sop->so_state, arg1, arg2);
|
|
|
|
switch (cmd) {
|
|
|
|
case CPCS_UNITDATA_SIG:
|
|
/*
|
|
* Decode/validate received PDU
|
|
*/
|
|
trlr = sscop_pdu_receive((KBuffer *)arg1, sop, &type);
|
|
if (trlr == NULL) {
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Validate sscop state
|
|
*/
|
|
if (sop->so_state > SOS_MAXSTATE) {
|
|
log(LOG_ERR,
|
|
"sscop_upper: invalid state sop=%p, state=%d\n",
|
|
sop, sop->so_state);
|
|
KB_FREEALL((KBuffer *)arg1);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Call event processing function
|
|
*/
|
|
ptab = sop->so_vers == SSCOP_VERS_QSAAL ?
|
|
sscop_qsaal_pdutab[type]:
|
|
sscop_q2110_pdutab[type];
|
|
func = ptab[sop->so_state];
|
|
if (func == NULL) {
|
|
log(LOG_ERR,
|
|
"sscop_upper: unsupported pdu=%d, state=%d\n",
|
|
type, sop->so_state);
|
|
break;
|
|
}
|
|
(*func)(sop, (KBuffer *)arg1, trlr);
|
|
break;
|
|
|
|
default:
|
|
log(LOG_ERR, "sscop_upper: unknown cmd 0x%x, sop=%p\n",
|
|
cmd, sop);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Decode and Validate Received PDU
|
|
*
|
|
* This function will process all received SSCOP PDUs. The PDU type will be
|
|
* determined and PDU format validation will be performed. If the PDU is
|
|
* successfully decoded and validated, the buffer chain will have the PDU
|
|
* trailer removed, but any resultant zero-length buffers will NOT be freed.
|
|
* If the PDU fails validation, then the buffer chain will be freed.
|
|
*
|
|
* Arguments:
|
|
* m pointer to PDU buffer chain
|
|
* sop pointer to sscop connection block
|
|
* typep address to store PDU type
|
|
*
|
|
* Returns:
|
|
* addr pointer to (contiguous) PDU trailer
|
|
* 0 invalid PDU, buffer chain freed
|
|
*
|
|
*/
|
|
static caddr_t
|
|
sscop_pdu_receive(m, sop, typep)
|
|
KBuffer *m;
|
|
struct sscop *sop;
|
|
int *typep;
|
|
{
|
|
KBuffer *m0, *ml, *mn;
|
|
caddr_t cp, tp;
|
|
int len, tlen, type, plen;
|
|
|
|
/*
|
|
* Calculate PDU length and find the last two buffers in the chain
|
|
*/
|
|
len = 0;
|
|
for (m0 = m, ml = mn = NULL; m0; m0 = KB_NEXT(m0)) {
|
|
len += KB_LEN(m0);
|
|
mn = ml;
|
|
ml = m0;
|
|
}
|
|
|
|
/*
|
|
* Make sure we've got a minimum sized PDU
|
|
*/
|
|
if (len < PDU_MIN_LEN)
|
|
goto badpdu;
|
|
|
|
/*
|
|
* Get PDU type field
|
|
*/
|
|
if (KB_LEN(ml) >= PDU_MIN_LEN) {
|
|
KB_DATAEND(ml, tp, caddr_t);
|
|
tp -= PDU_MIN_LEN;
|
|
} else {
|
|
KB_DATAEND(mn, tp, caddr_t);
|
|
tp -= (PDU_MIN_LEN - KB_LEN(ml));
|
|
}
|
|
*typep = type = *tp & PT_TYPE_MASK;
|
|
|
|
/*
|
|
* Check up on PDU length
|
|
*/
|
|
if (sop->so_vers == SSCOP_VERS_QSAAL) {
|
|
if ((len < (tlen = qsaal_pdulen[type].min)) ||
|
|
(len > qsaal_pdulen[type].max) ||
|
|
(len & PDU_LEN_MASK))
|
|
goto badpdu;
|
|
} else {
|
|
if ((len < (tlen = q2110_pdulen[type].min)) ||
|
|
(len > q2110_pdulen[type].max) ||
|
|
(len & PDU_LEN_MASK))
|
|
goto badpdu;
|
|
}
|
|
|
|
/*
|
|
* Get a contiguous, aligned PDU trailer and adjust buffer
|
|
* controls to remove trailer
|
|
*/
|
|
if (KB_LEN(ml) >= tlen) {
|
|
/*
|
|
* Trailer is contained in last buffer
|
|
*/
|
|
KB_TAILADJ(ml, -tlen);
|
|
KB_DATAEND(ml, cp, caddr_t);
|
|
if ((int)cp & PDU_ADDR_MASK) {
|
|
/*
|
|
* Trailer not aligned in buffer, use local memory
|
|
*/
|
|
KM_COPY(cp, (caddr_t)&sscop_trailer, tlen);
|
|
cp = (caddr_t)&sscop_trailer;
|
|
}
|
|
} else {
|
|
/*
|
|
* Trailer is split across buffers, use local memory
|
|
*/
|
|
caddr_t cp1;
|
|
int off = tlen - KB_LEN(ml);
|
|
|
|
cp = (caddr_t)&sscop_trailer;
|
|
|
|
/*
|
|
* Ensure trailer is within last two buffers
|
|
*/
|
|
if ((mn == NULL) || (KB_LEN(mn) < off))
|
|
goto badpdu;
|
|
|
|
KB_DATASTART(ml, cp1, caddr_t);
|
|
KM_COPY(cp1, cp + off, KB_LEN(ml));
|
|
KB_LEN(ml) = 0;
|
|
KB_TAILADJ(mn, -off);
|
|
KB_DATAEND(mn, cp1, caddr_t);
|
|
KM_COPY(cp1, cp, off);
|
|
}
|
|
|
|
/*
|
|
* Get possible PDU Pad Length
|
|
*/
|
|
if (sop->so_vers == SSCOP_VERS_QSAAL) {
|
|
if (qsaal_padlen[type])
|
|
plen = (*tp & PT_PAD_MASK) >> PT_PAD_SHIFT;
|
|
else
|
|
plen = 0;
|
|
} else {
|
|
if (q2110_padlen[type])
|
|
plen = (*tp & PT_PAD_MASK) >> PT_PAD_SHIFT;
|
|
else
|
|
plen = 0;
|
|
}
|
|
|
|
/*
|
|
* Perform Pad Length adjustments
|
|
*/
|
|
if (plen) {
|
|
if (KB_LEN(ml) >= plen) {
|
|
/*
|
|
* All pad bytes in last buffer
|
|
*/
|
|
KB_TAILADJ(ml, -plen);
|
|
} else {
|
|
/*
|
|
* Pad bytes split between buffers
|
|
*/
|
|
plen -= KB_LEN(ml);
|
|
if ((mn == NULL) || (KB_LEN(mn) < plen))
|
|
goto badpdu;
|
|
KB_LEN(ml) = 0;
|
|
KB_TAILADJ(mn, -plen);
|
|
}
|
|
}
|
|
|
|
return (cp);
|
|
|
|
badpdu:
|
|
/*
|
|
* This MAA Error is only supposed to be for a PDU length violation,
|
|
* but we use it for any PDU format error.
|
|
*/
|
|
sscop_maa_error(sop, 'U');
|
|
sscop_pdu_print(sop, m, "badpdu received");
|
|
KB_FREEALL(m);
|
|
return (NULL);
|
|
}
|
|
|