/* $Id: l3ni1.c,v 2.8.2.3 2004/01/13 14:31:25 keil Exp $
 *
 * NI1 D-channel protocol
 *
 * Author       Matt Henderson & Guy Ellis
 * Copyright    by Traverse Technologies Pty Ltd, www.travers.com.au
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * 2000.6.6 Initial implementation of routines for US NI1
 * Layer 3 protocol based on the EURO/DSS1 D-channel protocol
 * driver written by Karsten Keil et al.
 * NI-1 Hall of Fame - Thanks to....
 * Ragnar Paulson - for some handy code fragments
 * Will Scales - beta tester extraordinaire
 * Brett Whittacre - beta tester and remote devel system in Vegas
 *
 */

#include "hisax.h"
#include "isdnl3.h"
#include "l3ni1.h"
#include <linux/ctype.h>
#include <linux/slab.h>

extern char *HiSax_getrev(const char *revision);
static const char *ni1_revision = "$Revision: 2.8.2.3 $";

#define EXT_BEARER_CAPS 1

#define MsgHead(ptr, cref, mty)                 \
        *ptr++ = 0x8;                           \
        if (cref == -1) {                       \
                *ptr++ = 0x0;                   \
        } else {                                \
                *ptr++ = 0x1;                   \
                *ptr++ = cref^0x80;             \
        }                                       \
        *ptr++ = mty


/**********************************************/
/* get a new invoke id for remote operations. */
/* Only a return value != 0 is valid          */
/**********************************************/
static unsigned char new_invoke_id(struct PStack *p)
{
        unsigned char retval;
        int i;

        i = 32; /* maximum search depth */

        retval = p->prot.ni1.last_invoke_id + 1; /* try new id */
        while ((i) && (p->prot.ni1.invoke_used[retval >> 3] == 0xFF)) {
                p->prot.ni1.last_invoke_id = (retval & 0xF8) + 8;
                i--;
        }
        if (i) {
                while (p->prot.ni1.invoke_used[retval >> 3] & (1 << (retval & 7)))
                        retval++;
        } else
                retval = 0;
        p->prot.ni1.last_invoke_id = retval;
        p->prot.ni1.invoke_used[retval >> 3] |= (1 << (retval & 7));
        return (retval);
} /* new_invoke_id */

/*************************/
/* free a used invoke id */
/*************************/
static void free_invoke_id(struct PStack *p, unsigned char id)
{

        if (!id) return; /* 0 = invalid value */

        p->prot.ni1.invoke_used[id >> 3] &= ~(1 << (id & 7));
} /* free_invoke_id */


/**********************************************************/
/* create a new l3 process and fill in ni1 specific data */
/**********************************************************/
static struct l3_process
*ni1_new_l3_process(struct PStack *st, int cr)
{  struct l3_process *proc;

        if (!(proc = new_l3_process(st, cr)))
                return (NULL);

        proc->prot.ni1.invoke_id = 0;
        proc->prot.ni1.remote_operation = 0;
        proc->prot.ni1.uus1_data[0] = '\0';

        return (proc);
} /* ni1_new_l3_process */

/************************************************/
/* free a l3 process and all ni1 specific data */
/************************************************/
static void
ni1_release_l3_process(struct l3_process *p)
{
        free_invoke_id(p->st, p->prot.ni1.invoke_id);
        release_l3_process(p);
} /* ni1_release_l3_process */

/********************************************************/
/* search a process with invoke id id and dummy callref */
/********************************************************/
static struct l3_process *
l3ni1_search_dummy_proc(struct PStack *st, int id)
{ struct l3_process *pc = st->l3.proc; /* start of processes */

        if (!id) return (NULL);

        while (pc)
        { if ((pc->callref == -1) && (pc->prot.ni1.invoke_id == id))
                        return (pc);
                pc = pc->next;
        }
        return (NULL);
} /* l3ni1_search_dummy_proc */

/*******************************************************************/
/* called when a facility message with a dummy callref is received */
/* and a return result is delivered. id specifies the invoke id.   */
/*******************************************************************/
static void
l3ni1_dummy_return_result(struct PStack *st, int id, u_char *p, u_char nlen)
{ isdn_ctrl ic;
        struct IsdnCardState *cs;
        struct l3_process *pc = NULL;

        if ((pc = l3ni1_search_dummy_proc(st, id)))
        { L3DelTimer(&pc->timer); /* remove timer */

                cs = pc->st->l1.hardware;
                ic.driver = cs->myid;
                ic.command = ISDN_STAT_PROT;
                ic.arg = NI1_STAT_INVOKE_RES;
                ic.parm.ni1_io.hl_id = pc->prot.ni1.invoke_id;
                ic.parm.ni1_io.ll_id = pc->prot.ni1.ll_id;
                ic.parm.ni1_io.proc = pc->prot.ni1.proc;
                ic.parm.ni1_io.timeout = 0;
                ic.parm.ni1_io.datalen = nlen;
                ic.parm.ni1_io.data = p;
                free_invoke_id(pc->st, pc->prot.ni1.invoke_id);
                pc->prot.ni1.invoke_id = 0; /* reset id */

                cs->iif.statcallb(&ic);
                ni1_release_l3_process(pc);
        }
        else
                l3_debug(st, "dummy return result id=0x%x result len=%d", id, nlen);
} /* l3ni1_dummy_return_result */

/*******************************************************************/
/* called when a facility message with a dummy callref is received */
/* and a return error is delivered. id specifies the invoke id.    */
/*******************************************************************/
static void
l3ni1_dummy_error_return(struct PStack *st, int id, ulong error)
{ isdn_ctrl ic;
        struct IsdnCardState *cs;
        struct l3_process *pc = NULL;

        if ((pc = l3ni1_search_dummy_proc(st, id)))
        { L3DelTimer(&pc->timer); /* remove timer */

                cs = pc->st->l1.hardware;
                ic.driver = cs->myid;
                ic.command = ISDN_STAT_PROT;
                ic.arg = NI1_STAT_INVOKE_ERR;
                ic.parm.ni1_io.hl_id = pc->prot.ni1.invoke_id;
                ic.parm.ni1_io.ll_id = pc->prot.ni1.ll_id;
                ic.parm.ni1_io.proc = pc->prot.ni1.proc;
                ic.parm.ni1_io.timeout = error;
                ic.parm.ni1_io.datalen = 0;
                ic.parm.ni1_io.data = NULL;
                free_invoke_id(pc->st, pc->prot.ni1.invoke_id);
                pc->prot.ni1.invoke_id = 0; /* reset id */

                cs->iif.statcallb(&ic);
                ni1_release_l3_process(pc);
        }
        else
                l3_debug(st, "dummy return error id=0x%x error=0x%lx", id, error);
} /* l3ni1_error_return */

/*******************************************************************/
/* called when a facility message with a dummy callref is received */
/* and a invoke is delivered. id specifies the invoke id.          */
/*******************************************************************/
static void
l3ni1_dummy_invoke(struct PStack *st, int cr, int id,
                   int ident, u_char *p, u_char nlen)
{ isdn_ctrl ic;
        struct IsdnCardState *cs;

        l3_debug(st, "dummy invoke %s id=0x%x ident=0x%x datalen=%d",
                 (cr == -1) ? "local" : "broadcast", id, ident, nlen);
        if (cr >= -1) return; /* ignore local data */

        cs = st->l1.hardware;
        ic.driver = cs->myid;
        ic.command = ISDN_STAT_PROT;
        ic.arg = NI1_STAT_INVOKE_BRD;
        ic.parm.ni1_io.hl_id = id;
        ic.parm.ni1_io.ll_id = 0;
        ic.parm.ni1_io.proc = ident;
        ic.parm.ni1_io.timeout = 0;
        ic.parm.ni1_io.datalen = nlen;
        ic.parm.ni1_io.data = p;

        cs->iif.statcallb(&ic);
} /* l3ni1_dummy_invoke */

static void
l3ni1_parse_facility(struct PStack *st, struct l3_process *pc,
                     int cr, u_char *p)
{
        int qd_len = 0;
        unsigned char nlen = 0, ilen, cp_tag;
        int ident, id;
        ulong err_ret;

        if (pc)
                st = pc->st; /* valid Stack */
        else
                if ((!st) || (cr >= 0)) return; /* neither pc nor st specified */

        p++;
        qd_len = *p++;
        if (qd_len == 0) {
                l3_debug(st, "qd_len == 0");
                return;
        }
        if ((*p & 0x1F) != 0x11) {      /* Service discriminator, supplementary service */
                l3_debug(st, "supplementary service != 0x11");
                return;
        }
        while (qd_len > 0 && !(*p & 0x80)) {    /* extension ? */
                p++;
                qd_len--;
        }
        if (qd_len < 2) {
                l3_debug(st, "qd_len < 2");
                return;
        }
        p++;
        qd_len--;
        if ((*p & 0xE0) != 0xA0) {      /* class and form */
                l3_debug(st, "class and form != 0xA0");
                return;
        }

        cp_tag = *p & 0x1F; /* remember tag value */

        p++;
        qd_len--;
        if (qd_len < 1)
        { l3_debug(st, "qd_len < 1");
                return;
        }
        if (*p & 0x80)
        { /* length format indefinite or limited */
                nlen = *p++ & 0x7F; /* number of len bytes or indefinite */
                if ((qd_len-- < ((!nlen) ? 3 : (1 + nlen))) ||
                    (nlen > 1))
                { l3_debug(st, "length format error or not implemented");
                        return;
                }
                if (nlen == 1)
                { nlen = *p++; /* complete length */
                        qd_len--;
                }
                else
                { qd_len -= 2; /* trailing null bytes */
                        if ((*(p + qd_len)) || (*(p + qd_len + 1)))
                        { l3_debug(st, "length format indefinite error");
                                return;
                        }
                        nlen = qd_len;
                }
        }
        else
        { nlen = *p++;
                qd_len--;
        }
        if (qd_len < nlen)
        { l3_debug(st, "qd_len < nlen");
                return;
        }
        qd_len -= nlen;

        if (nlen < 2)
        { l3_debug(st, "nlen < 2");
                return;
        }
        if (*p != 0x02)
        {  /* invoke identifier tag */
                l3_debug(st, "invoke identifier tag !=0x02");
                return;
        }
        p++;
        nlen--;
        if (*p & 0x80)
        { /* length format */
                l3_debug(st, "invoke id length format 2");
                return;
        }
        ilen = *p++;
        nlen--;
        if (ilen > nlen || ilen == 0)
        { l3_debug(st, "ilen > nlen || ilen == 0");
                return;
        }
        nlen -= ilen;
        id = 0;
        while (ilen > 0)
        { id = (id << 8) | (*p++ & 0xFF);       /* invoke identifier */
                ilen--;
        }

        switch (cp_tag) {       /* component tag */
        case 1: /* invoke */
                if (nlen < 2) {
                        l3_debug(st, "nlen < 2 22");
                        return;
                }
                if (*p != 0x02) {       /* operation value */
                        l3_debug(st, "operation value !=0x02");
                        return;
                }
                p++;
                nlen--;
                ilen = *p++;
                nlen--;
                if (ilen > nlen || ilen == 0) {
                        l3_debug(st, "ilen > nlen || ilen == 0 22");
                        return;
                }
                nlen -= ilen;
                ident = 0;
                while (ilen > 0) {
                        ident = (ident << 8) | (*p++ & 0xFF);
                        ilen--;
                }

                if (!pc)
                {
                        l3ni1_dummy_invoke(st, cr, id, ident, p, nlen);
                        return;
                }
                l3_debug(st, "invoke break");
                break;
        case 2: /* return result */
                /* if no process available handle separately */
                if (!pc)
                { if (cr == -1)
                                l3ni1_dummy_return_result(st, id, p, nlen);
                        return;
                }
                if ((pc->prot.ni1.invoke_id) && (pc->prot.ni1.invoke_id == id))
                { /* Diversion successful */
                        free_invoke_id(st, pc->prot.ni1.invoke_id);
                        pc->prot.ni1.remote_result = 0; /* success */
                        pc->prot.ni1.invoke_id = 0;
                        pc->redir_result = pc->prot.ni1.remote_result;
                        st->l3.l3l4(st, CC_REDIR | INDICATION, pc); } /* Diversion successful */
                else
                        l3_debug(st, "return error unknown identifier");
                break;
        case 3: /* return error */
                err_ret = 0;
                if (nlen < 2)
                { l3_debug(st, "return error nlen < 2");
                        return;
                }
                if (*p != 0x02)
                { /* result tag */
                        l3_debug(st, "invoke error tag !=0x02");
                        return;
                }
                p++;
                nlen--;
                if (*p > 4)
                { /* length format */
                        l3_debug(st, "invoke return errlen > 4 ");
                        return;
                }
                ilen = *p++;
                nlen--;
                if (ilen > nlen || ilen == 0)
                { l3_debug(st, "error return ilen > nlen || ilen == 0");
                        return;
                }
                nlen -= ilen;
                while (ilen > 0)
                { err_ret = (err_ret << 8) | (*p++ & 0xFF);     /* error value */
                        ilen--;
                }
                /* if no process available handle separately */
                if (!pc)
                { if (cr == -1)
                                l3ni1_dummy_error_return(st, id, err_ret);
                        return;
                }
                if ((pc->prot.ni1.invoke_id) && (pc->prot.ni1.invoke_id == id))
                { /* Deflection error */
                        free_invoke_id(st, pc->prot.ni1.invoke_id);
                        pc->prot.ni1.remote_result = err_ret; /* result */
                        pc->prot.ni1.invoke_id = 0;
                        pc->redir_result = pc->prot.ni1.remote_result;
                        st->l3.l3l4(st, CC_REDIR | INDICATION, pc);
                } /* Deflection error */
                else
                        l3_debug(st, "return result unknown identifier");
                break;
        default:
                l3_debug(st, "facility default break tag=0x%02x", cp_tag);
                break;
        }
}

static void
l3ni1_message(struct l3_process *pc, u_char mt)
{
        struct sk_buff *skb;
        u_char *p;

        if (!(skb = l3_alloc_skb(4)))
                return;
        p = skb_put(skb, 4);
        MsgHead(p, pc->callref, mt);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
}

static void
l3ni1_message_plus_chid(struct l3_process *pc, u_char mt)
/* sends an l3 messages plus channel id -  added GE 05/09/00 */
{
        struct sk_buff *skb;
        u_char tmp[16];
        u_char *p = tmp;
        u_char chid;

        chid = (u_char)(pc->para.bchannel & 0x03) | 0x88;
        MsgHead(p, pc->callref, mt);
        *p++ = IE_CHANNEL_ID;
        *p++ = 0x01;
        *p++ = chid;

        if (!(skb = l3_alloc_skb(7)))
                return;
        memcpy(skb_put(skb, 7), tmp, 7);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
}

static void
l3ni1_message_cause(struct l3_process *pc, u_char mt, u_char cause)
{
        struct sk_buff *skb;
        u_char tmp[16];
        u_char *p = tmp;
        int l;

        MsgHead(p, pc->callref, mt);
        *p++ = IE_CAUSE;
        *p++ = 0x2;
        *p++ = 0x80;
        *p++ = cause | 0x80;

        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
}

static void
l3ni1_status_send(struct l3_process *pc, u_char pr, void *arg)
{
        u_char tmp[16];
        u_char *p = tmp;
        int l;
        struct sk_buff *skb;

        MsgHead(p, pc->callref, MT_STATUS);

        *p++ = IE_CAUSE;
        *p++ = 0x2;
        *p++ = 0x80;
        *p++ = pc->para.cause | 0x80;

        *p++ = IE_CALL_STATE;
        *p++ = 0x1;
        *p++ = pc->state & 0x3f;

        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
}

static void
l3ni1_msg_without_setup(struct l3_process *pc, u_char pr, void *arg)
{
        /* This routine is called if here was no SETUP made (checks in ni1up and in
         * l3ni1_setup) and a RELEASE_COMPLETE have to be sent with an error code
         * MT_STATUS_ENQUIRE in the NULL state is handled too
         */
        u_char tmp[16];
        u_char *p = tmp;
        int l;
        struct sk_buff *skb;

        switch (pc->para.cause) {
        case 81:        /* invalid callreference */
        case 88:        /* incomp destination */
        case 96:        /* mandory IE missing */
        case 100:       /* invalid IE contents */
        case 101:       /* incompatible Callstate */
                MsgHead(p, pc->callref, MT_RELEASE_COMPLETE);
                *p++ = IE_CAUSE;
                *p++ = 0x2;
                *p++ = 0x80;
                *p++ = pc->para.cause | 0x80;
                break;
        default:
                printk(KERN_ERR "HiSax l3ni1_msg_without_setup wrong cause %d\n",
                       pc->para.cause);
                return;
        }
        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
        ni1_release_l3_process(pc);
}

static int ie_ALERTING[] = {IE_BEARER, IE_CHANNEL_ID | IE_MANDATORY_1,
                            IE_FACILITY, IE_PROGRESS, IE_DISPLAY, IE_SIGNAL, IE_HLC,
                            IE_USER_USER, -1};
static int ie_CALL_PROCEEDING[] = {IE_BEARER, IE_CHANNEL_ID | IE_MANDATORY_1,
                                   IE_FACILITY, IE_PROGRESS, IE_DISPLAY, IE_HLC, -1};
static int ie_CONNECT[] = {IE_BEARER, IE_CHANNEL_ID | IE_MANDATORY_1,
                           IE_FACILITY, IE_PROGRESS, IE_DISPLAY, IE_DATE, IE_SIGNAL,
                           IE_CONNECT_PN, IE_CONNECT_SUB, IE_LLC, IE_HLC, IE_USER_USER, -1};
static int ie_CONNECT_ACKNOWLEDGE[] = {IE_CHANNEL_ID, IE_DISPLAY, IE_SIGNAL, -1};
static int ie_DISCONNECT[] = {IE_CAUSE | IE_MANDATORY, IE_FACILITY,
                              IE_PROGRESS, IE_DISPLAY, IE_SIGNAL, IE_USER_USER, -1};
static int ie_INFORMATION[] = {IE_COMPLETE, IE_DISPLAY, IE_KEYPAD, IE_SIGNAL,
                               IE_CALLED_PN, -1};
static int ie_NOTIFY[] = {IE_BEARER, IE_NOTIFY | IE_MANDATORY, IE_DISPLAY, -1};
static int ie_PROGRESS[] = {IE_BEARER, IE_CAUSE, IE_FACILITY, IE_PROGRESS |
                            IE_MANDATORY, IE_DISPLAY, IE_HLC, IE_USER_USER, -1};
static int ie_RELEASE[] = {IE_CAUSE | IE_MANDATORY_1, IE_FACILITY, IE_DISPLAY,
                           IE_SIGNAL, IE_USER_USER, -1};
/* a RELEASE_COMPLETE with errors don't require special actions
   static int ie_RELEASE_COMPLETE[] = {IE_CAUSE | IE_MANDATORY_1, IE_DISPLAY, IE_SIGNAL, IE_USER_USER, -1};
*/
static int ie_RESUME_ACKNOWLEDGE[] = {IE_CHANNEL_ID | IE_MANDATORY, IE_FACILITY,
                                      IE_DISPLAY, -1};
static int ie_RESUME_REJECT[] = {IE_CAUSE | IE_MANDATORY, IE_DISPLAY, -1};
static int ie_SETUP[] = {IE_COMPLETE, IE_BEARER  | IE_MANDATORY,
                         IE_CHANNEL_ID | IE_MANDATORY, IE_FACILITY, IE_PROGRESS,
                         IE_NET_FAC, IE_DISPLAY, IE_KEYPAD, IE_SIGNAL, IE_CALLING_PN,
                         IE_CALLING_SUB, IE_CALLED_PN, IE_CALLED_SUB, IE_REDIR_NR,
                         IE_LLC, IE_HLC, IE_USER_USER, -1};
static int ie_SETUP_ACKNOWLEDGE[] = {IE_CHANNEL_ID | IE_MANDATORY, IE_FACILITY,
                                     IE_PROGRESS, IE_DISPLAY, IE_SIGNAL, -1};
static int ie_STATUS[] = {IE_CAUSE | IE_MANDATORY, IE_CALL_STATE |
                          IE_MANDATORY, IE_DISPLAY, -1};
static int ie_STATUS_ENQUIRY[] = {IE_DISPLAY, -1};
static int ie_SUSPEND_ACKNOWLEDGE[] = {IE_DISPLAY, IE_FACILITY, -1};
static int ie_SUSPEND_REJECT[] = {IE_CAUSE | IE_MANDATORY, IE_DISPLAY, -1};
/* not used
 * static int ie_CONGESTION_CONTROL[] = {IE_CONGESTION | IE_MANDATORY,
 *              IE_CAUSE | IE_MANDATORY, IE_DISPLAY, -1};
 * static int ie_USER_INFORMATION[] = {IE_MORE_DATA, IE_USER_USER | IE_MANDATORY, -1};
 * static int ie_RESTART[] = {IE_CHANNEL_ID, IE_DISPLAY, IE_RESTART_IND |
 *              IE_MANDATORY, -1};
 */
static int ie_FACILITY[] = {IE_FACILITY | IE_MANDATORY, IE_DISPLAY, -1};
static int comp_required[] = {1, 2, 3, 5, 6, 7, 9, 10, 11, 14, 15, -1};
static int l3_valid_states[] = {0, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 15, 17, 19, 25, -1};

struct ie_len {
        int ie;
        int len;
};

static
struct ie_len max_ie_len[] = {
        {IE_SEGMENT, 4},
        {IE_BEARER, 12},
        {IE_CAUSE, 32},
        {IE_CALL_ID, 10},
        {IE_CALL_STATE, 3},
        {IE_CHANNEL_ID, 34},
        {IE_FACILITY, 255},
        {IE_PROGRESS, 4},
        {IE_NET_FAC, 255},
        {IE_NOTIFY, 3},
        {IE_DISPLAY, 82},
        {IE_DATE, 8},
        {IE_KEYPAD, 34},
        {IE_SIGNAL, 3},
        {IE_INFORATE, 6},
        {IE_E2E_TDELAY, 11},
        {IE_TDELAY_SEL, 5},
        {IE_PACK_BINPARA, 3},
        {IE_PACK_WINSIZE, 4},
        {IE_PACK_SIZE, 4},
        {IE_CUG, 7},
        {IE_REV_CHARGE, 3},
        {IE_CALLING_PN, 24},
        {IE_CALLING_SUB, 23},
        {IE_CALLED_PN, 24},
        {IE_CALLED_SUB, 23},
        {IE_REDIR_NR, 255},
        {IE_TRANS_SEL, 255},
        {IE_RESTART_IND, 3},
        {IE_LLC, 18},
        {IE_HLC, 5},
        {IE_USER_USER, 131},
        {-1, 0},
};

static int
getmax_ie_len(u_char ie) {
        int i = 0;
        while (max_ie_len[i].ie != -1) {
                if (max_ie_len[i].ie == ie)
                        return (max_ie_len[i].len);
                i++;
        }
        return (255);
}

static int
ie_in_set(struct l3_process *pc, u_char ie, int *checklist) {
        int ret = 1;

        while (*checklist != -1) {
                if ((*checklist & 0xff) == ie) {
                        if (ie & 0x80)
                                return (-ret);
                        else
                                return (ret);
                }
                ret++;
                checklist++;
        }
        return (0);
}

static int
check_infoelements(struct l3_process *pc, struct sk_buff *skb, int *checklist)
{
        int *cl = checklist;
        u_char mt;
        u_char *p, ie;
        int l, newpos, oldpos;
        int err_seq = 0, err_len = 0, err_compr = 0, err_ureg = 0;
        u_char codeset = 0;
        u_char old_codeset = 0;
        u_char codelock = 1;

        p = skb->data;
        /* skip cr */
        p++;
        l = (*p++) & 0xf;
        p += l;
        mt = *p++;
        oldpos = 0;
        while ((p - skb->data) < skb->len) {
                if ((*p & 0xf0) == 0x90) { /* shift codeset */
                        old_codeset = codeset;
                        codeset = *p & 7;
                        if (*p & 0x08)
                                codelock = 0;
                        else
                                codelock = 1;
                        if (pc->debug & L3_DEB_CHECK)
                                l3_debug(pc->st, "check IE shift%scodeset %d->%d",
                                         codelock ? " locking " : " ", old_codeset, codeset);
                        p++;
                        continue;
                }
                if (!codeset) { /* only codeset 0 */
                        if ((newpos = ie_in_set(pc, *p, cl))) {
                                if (newpos > 0) {
                                        if (newpos < oldpos)
                                                err_seq++;
                                        else
                                                oldpos = newpos;
                                }
                        } else {
                                if (ie_in_set(pc, *p, comp_required))
                                        err_compr++;
                                else
                                        err_ureg++;
                        }
                }
                ie = *p++;
                if (ie & 0x80) {
                        l = 1;
                } else {
                        l = *p++;
                        p += l;
                        l += 2;
                }
                if (!codeset && (l > getmax_ie_len(ie)))
                        err_len++;
                if (!codelock) {
                        if (pc->debug & L3_DEB_CHECK)
                                l3_debug(pc->st, "check IE shift back codeset %d->%d",
                                         codeset, old_codeset);
                        codeset = old_codeset;
                        codelock = 1;
                }
        }
        if (err_compr | err_ureg | err_len | err_seq) {
                if (pc->debug & L3_DEB_CHECK)
                        l3_debug(pc->st, "check IE MT(%x) %d/%d/%d/%d",
                                 mt, err_compr, err_ureg, err_len, err_seq);
                if (err_compr)
                        return (ERR_IE_COMPREHENSION);
                if (err_ureg)
                        return (ERR_IE_UNRECOGNIZED);
                if (err_len)
                        return (ERR_IE_LENGTH);
                if (err_seq)
                        return (ERR_IE_SEQUENCE);
        }
        return (0);
}

/* verify if a message type exists and contain no IE error */
static int
l3ni1_check_messagetype_validity(struct l3_process *pc, int mt, void *arg)
{
        switch (mt) {
        case MT_ALERTING:
        case MT_CALL_PROCEEDING:
        case MT_CONNECT:
        case MT_CONNECT_ACKNOWLEDGE:
        case MT_DISCONNECT:
        case MT_INFORMATION:
        case MT_FACILITY:
        case MT_NOTIFY:
        case MT_PROGRESS:
        case MT_RELEASE:
        case MT_RELEASE_COMPLETE:
        case MT_SETUP:
        case MT_SETUP_ACKNOWLEDGE:
        case MT_RESUME_ACKNOWLEDGE:
        case MT_RESUME_REJECT:
        case MT_SUSPEND_ACKNOWLEDGE:
        case MT_SUSPEND_REJECT:
        case MT_USER_INFORMATION:
        case MT_RESTART:
        case MT_RESTART_ACKNOWLEDGE:
        case MT_CONGESTION_CONTROL:
        case MT_STATUS:
        case MT_STATUS_ENQUIRY:
                if (pc->debug & L3_DEB_CHECK)
                        l3_debug(pc->st, "l3ni1_check_messagetype_validity mt(%x) OK", mt);
                break;
        case MT_RESUME: /* RESUME only in user->net */
        case MT_SUSPEND: /* SUSPEND only in user->net */
        default:
                if (pc->debug & (L3_DEB_CHECK | L3_DEB_WARN))
                        l3_debug(pc->st, "l3ni1_check_messagetype_validity mt(%x) fail", mt);
                pc->para.cause = 97;
                l3ni1_status_send(pc, 0, NULL);
                return (1);
        }
        return (0);
}

static void
l3ni1_std_ie_err(struct l3_process *pc, int ret) {

        if (pc->debug & L3_DEB_CHECK)
                l3_debug(pc->st, "check_infoelements ret %d", ret);
        switch (ret) {
        case 0:
                break;
        case ERR_IE_COMPREHENSION:
                pc->para.cause = 96;
                l3ni1_status_send(pc, 0, NULL);
                break;
        case ERR_IE_UNRECOGNIZED:
                pc->para.cause = 99;
                l3ni1_status_send(pc, 0, NULL);
                break;
        case ERR_IE_LENGTH:
                pc->para.cause = 100;
                l3ni1_status_send(pc, 0, NULL);
                break;
        case ERR_IE_SEQUENCE:
        default:
                break;
        }
}

static int
l3ni1_get_channel_id(struct l3_process *pc, struct sk_buff *skb) {
        u_char *p;

        p = skb->data;
        if ((p = findie(p, skb->len, IE_CHANNEL_ID, 0))) {
                p++;
                if (*p != 1) { /* len for BRI = 1 */
                        if (pc->debug & L3_DEB_WARN)
                                l3_debug(pc->st, "wrong chid len %d", *p);
                        return (-2);
                }
                p++;
                if (*p & 0x60) { /* only base rate interface */
                        if (pc->debug & L3_DEB_WARN)
                                l3_debug(pc->st, "wrong chid %x", *p);
                        return (-3);
                }
                return (*p & 0x3);
        } else
                return (-1);
}

static int
l3ni1_get_cause(struct l3_process *pc, struct sk_buff *skb) {
        u_char l, i = 0;
        u_char *p;

        p = skb->data;
        pc->para.cause = 31;
        pc->para.loc = 0;
        if ((p = findie(p, skb->len, IE_CAUSE, 0))) {
                p++;
                l = *p++;
                if (l > 30)
                        return (1);
                if (l) {
                        pc->para.loc = *p++;
                        l--;
                } else {
                        return (2);
                }
                if (l && !(pc->para.loc & 0x80)) {
                        l--;
                        p++; /* skip recommendation */
                }
                if (l) {
                        pc->para.cause = *p++;
                        l--;
                        if (!(pc->para.cause & 0x80))
                                return (3);
                } else
                        return (4);
                while (l && (i < 6)) {
                        pc->para.diag[i++] = *p++;
                        l--;
                }
        } else
                return (-1);
        return (0);
}

static void
l3ni1_msg_with_uus(struct l3_process *pc, u_char cmd)
{
        struct sk_buff *skb;
        u_char tmp[16 + 40];
        u_char *p = tmp;
        int l;

        MsgHead(p, pc->callref, cmd);

        if (pc->prot.ni1.uus1_data[0])
        { *p++ = IE_USER_USER; /* UUS info element */
                *p++ = strlen(pc->prot.ni1.uus1_data) + 1;
                *p++ = 0x04; /* IA5 chars */
                strcpy(p, pc->prot.ni1.uus1_data);
                p += strlen(pc->prot.ni1.uus1_data);
                pc->prot.ni1.uus1_data[0] = '\0';
        }

        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
} /* l3ni1_msg_with_uus */

static void
l3ni1_release_req(struct l3_process *pc, u_char pr, void *arg)
{
        StopAllL3Timer(pc);
        newl3state(pc, 19);
        if (!pc->prot.ni1.uus1_data[0])
                l3ni1_message(pc, MT_RELEASE);
        else
                l3ni1_msg_with_uus(pc, MT_RELEASE);
        L3AddTimer(&pc->timer, T308, CC_T308_1);
}

static void
l3ni1_release_cmpl(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int ret;

        if ((ret = l3ni1_get_cause(pc, skb)) > 0) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "RELCMPL get_cause ret(%d)", ret);
        } else if (ret < 0)
                pc->para.cause = NO_CAUSE;
        StopAllL3Timer(pc);
        newl3state(pc, 0);
        pc->st->l3.l3l4(pc->st, CC_RELEASE | CONFIRM, pc);
        ni1_release_l3_process(pc);
}

#if EXT_BEARER_CAPS

static u_char *
EncodeASyncParams(u_char *p, u_char si2)
{                               // 7c 06 88  90 21 42 00 bb

        p[0] = 0;
        p[1] = 0x40;            // Intermediate rate: 16 kbit/s jj 2000.02.19
        p[2] = 0x80;
        if (si2 & 32)           // 7 data bits

                p[2] += 16;
        else                    // 8 data bits

                p[2] += 24;

        if (si2 & 16)           // 2 stop bits

                p[2] += 96;
        else                    // 1 stop bit

                p[2] += 32;

        if (si2 & 8)            // even parity

                p[2] += 2;
        else                    // no parity

                p[2] += 3;

        switch (si2 & 0x07) {
        case 0:
                p[0] = 66;      // 1200 bit/s

                break;
        case 1:
                p[0] = 88;      // 1200/75 bit/s

                break;
        case 2:
                p[0] = 87;      // 75/1200 bit/s

                break;
        case 3:
                p[0] = 67;      // 2400 bit/s

                break;
        case 4:
                p[0] = 69;      // 4800 bit/s

                break;
        case 5:
                p[0] = 72;      // 9600 bit/s

                break;
        case 6:
                p[0] = 73;      // 14400 bit/s

                break;
        case 7:
                p[0] = 75;      // 19200 bit/s

                break;
        }
        return p + 3;
}

static u_char
EncodeSyncParams(u_char si2, u_char ai)
{

        switch (si2) {
        case 0:
                return ai + 2;  // 1200 bit/s

        case 1:
                return ai + 24;         // 1200/75 bit/s

        case 2:
                return ai + 23;         // 75/1200 bit/s

        case 3:
                return ai + 3;  // 2400 bit/s

        case 4:
                return ai + 5;  // 4800 bit/s

        case 5:
                return ai + 8;  // 9600 bit/s

        case 6:
                return ai + 9;  // 14400 bit/s

        case 7:
                return ai + 11;         // 19200 bit/s

        case 8:
                return ai + 14;         // 48000 bit/s

        case 9:
                return ai + 15;         // 56000 bit/s

        case 15:
                return ai + 40;         // negotiate bit/s

        default:
                break;
        }
        return ai;
}


static u_char
DecodeASyncParams(u_char si2, u_char *p)
{
        u_char info;

        switch (p[5]) {
        case 66:        // 1200 bit/s

                break;  // si2 don't change

        case 88:        // 1200/75 bit/s

                si2 += 1;
                break;
        case 87:        // 75/1200 bit/s

                si2 += 2;
                break;
        case 67:        // 2400 bit/s

                si2 += 3;
                break;
        case 69:        // 4800 bit/s

                si2 += 4;
                break;
        case 72:        // 9600 bit/s

                si2 += 5;
                break;
        case 73:        // 14400 bit/s

                si2 += 6;
                break;
        case 75:        // 19200 bit/s

                si2 += 7;
                break;
        }

        info = p[7] & 0x7f;
        if ((info & 16) && (!(info & 8)))       // 7 data bits

                si2 += 32;      // else 8 data bits

        if ((info & 96) == 96)  // 2 stop bits

                si2 += 16;      // else 1 stop bit

        if ((info & 2) && (!(info & 1)))        // even parity

                si2 += 8;       // else no parity

        return si2;
}


static u_char
DecodeSyncParams(u_char si2, u_char info)
{
        info &= 0x7f;
        switch (info) {
        case 40:        // bit/s negotiation failed  ai := 165 not 175!

                return si2 + 15;
        case 15:        // 56000 bit/s failed, ai := 0 not 169 !

                return si2 + 9;
        case 14:        // 48000 bit/s

                return si2 + 8;
        case 11:        // 19200 bit/s

                return si2 + 7;
        case 9: // 14400 bit/s

                return si2 + 6;
        case 8: // 9600  bit/s

                return si2 + 5;
        case 5: // 4800  bit/s

                return si2 + 4;
        case 3: // 2400  bit/s

                return si2 + 3;
        case 23:        // 75/1200 bit/s

                return si2 + 2;
        case 24:        // 1200/75 bit/s

                return si2 + 1;
        default:        // 1200 bit/s

                return si2;
        }
}

static u_char
DecodeSI2(struct sk_buff *skb)
{
        u_char *p;              //, *pend=skb->data + skb->len;

        if ((p = findie(skb->data, skb->len, 0x7c, 0))) {
                switch (p[4] & 0x0f) {
                case 0x01:
                        if (p[1] == 0x04)       // sync. Bitratenadaption

                                return DecodeSyncParams(160, p[5]);     // V.110/X.30

                        else if (p[1] == 0x06)  // async. Bitratenadaption

                                return DecodeASyncParams(192, p);       // V.110/X.30

                        break;
                case 0x08:      // if (p[5] == 0x02) // sync. Bitratenadaption
                        if (p[1] > 3)
                                return DecodeSyncParams(176, p[5]);     // V.120
                        break;
                }
        }
        return 0;
}

#endif


static void
l3ni1_setup_req(struct l3_process *pc, u_char pr,
                void *arg)
{
        struct sk_buff *skb;
        u_char tmp[128];
        u_char *p = tmp;

        u_char *teln;
        u_char *sub;
        u_char *sp;
        int l;

        MsgHead(p, pc->callref, MT_SETUP);

        teln = pc->para.setup.phone;

        *p++ = 0xa1;            /* complete indicator */
        /*
         * Set Bearer Capability, Map info from 1TR6-convention to NI1
         */
        switch (pc->para.setup.si1) {
        case 1:                   /* Telephony                                */
                *p++ = IE_BEARER;
                *p++ = 0x3;       /* Length                                   */
                *p++ = 0x90;      /* 3.1khz Audio                             */
                *p++ = 0x90;      /* Circuit-Mode 64kbps                      */
                *p++ = 0xa2;      /* u-Law Audio                              */
                break;
        case 5:                   /* Datatransmission 64k, BTX                */
        case 7:                   /* Datatransmission 64k                     */
        default:
                *p++ = IE_BEARER;
                *p++ = 0x2;       /* Length                                   */
                *p++ = 0x88;      /* Coding Std. CCITT, unrestr. dig. Inform. */
                *p++ = 0x90;      /* Circuit-Mode 64kbps                      */
                break;
        }

        sub = NULL;
        sp = teln;
        while (*sp) {
                if ('.' == *sp) {
                        sub = sp;
                        *sp = 0;
                } else
                        sp++;
        }

        *p++ = IE_KEYPAD;
        *p++ = strlen(teln);
        while (*teln)
                *p++ = (*teln++) & 0x7F;

        if (sub)
                *sub++ = '.';

#if EXT_BEARER_CAPS
        if ((pc->para.setup.si2 >= 160) && (pc->para.setup.si2 <= 175)) {       // sync. Bitratenadaption, V.110/X.30

                *p++ = IE_LLC;
                *p++ = 0x04;
                *p++ = 0x88;
                *p++ = 0x90;
                *p++ = 0x21;
                *p++ = EncodeSyncParams(pc->para.setup.si2 - 160, 0x80);
        } else if ((pc->para.setup.si2 >= 176) && (pc->para.setup.si2 <= 191)) {        // sync. Bitratenadaption, V.120

                *p++ = IE_LLC;
                *p++ = 0x05;
                *p++ = 0x88;
                *p++ = 0x90;
                *p++ = 0x28;
                *p++ = EncodeSyncParams(pc->para.setup.si2 - 176, 0);
                *p++ = 0x82;
        } else if (pc->para.setup.si2 >= 192) {         // async. Bitratenadaption, V.110/X.30

                *p++ = IE_LLC;
                *p++ = 0x06;
                *p++ = 0x88;
                *p++ = 0x90;
                *p++ = 0x21;
                p = EncodeASyncParams(p, pc->para.setup.si2 - 192);
        } else {
                switch (pc->para.setup.si1) {
                case 1:                 /* Telephony                                */
                        *p++ = IE_LLC;
                        *p++ = 0x3;     /* Length                                   */
                        *p++ = 0x90;    /* Coding Std. CCITT, 3.1 kHz audio         */
                        *p++ = 0x90;    /* Circuit-Mode 64kbps                      */
                        *p++ = 0xa2;    /* u-Law Audio                              */
                        break;
                case 5:                 /* Datatransmission 64k, BTX                */
                case 7:                 /* Datatransmission 64k                     */
                default:
                        *p++ = IE_LLC;
                        *p++ = 0x2;     /* Length                                   */
                        *p++ = 0x88;    /* Coding Std. CCITT, unrestr. dig. Inform. */
                        *p++ = 0x90;    /* Circuit-Mode 64kbps                      */
                        break;
                }
        }
#endif
        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
        {
                return;
        }
        memcpy(skb_put(skb, l), tmp, l);
        L3DelTimer(&pc->timer);
        L3AddTimer(&pc->timer, T303, CC_T303);
        newl3state(pc, 1);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
}

static void
l3ni1_call_proc(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int id, ret;

        if ((id = l3ni1_get_channel_id(pc, skb)) >= 0) {
                if ((0 == id) || ((3 == id) && (0x10 == pc->para.moderate))) {
                        if (pc->debug & L3_DEB_WARN)
                                l3_debug(pc->st, "setup answer with wrong chid %x", id);
                        pc->para.cause = 100;
                        l3ni1_status_send(pc, pr, NULL);
                        return;
                }
                pc->para.bchannel = id;
        } else if (1 == pc->state) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "setup answer wrong chid (ret %d)", id);
                if (id == -1)
                        pc->para.cause = 96;
                else
                        pc->para.cause = 100;
                l3ni1_status_send(pc, pr, NULL);
                return;
        }
        /* Now we are on none mandatory IEs */
        ret = check_infoelements(pc, skb, ie_CALL_PROCEEDING);
        if (ERR_IE_COMPREHENSION == ret) {
                l3ni1_std_ie_err(pc, ret);
                return;
        }
        L3DelTimer(&pc->timer);
        newl3state(pc, 3);
        L3AddTimer(&pc->timer, T310, CC_T310);
        if (ret) /* STATUS for none mandatory IE errors after actions are taken */
                l3ni1_std_ie_err(pc, ret);
        pc->st->l3.l3l4(pc->st, CC_PROCEEDING | INDICATION, pc);
}

static void
l3ni1_setup_ack(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int id, ret;

        if ((id = l3ni1_get_channel_id(pc, skb)) >= 0) {
                if ((0 == id) || ((3 == id) && (0x10 == pc->para.moderate))) {
                        if (pc->debug & L3_DEB_WARN)
                                l3_debug(pc->st, "setup answer with wrong chid %x", id);
                        pc->para.cause = 100;
                        l3ni1_status_send(pc, pr, NULL);
                        return;
                }
                pc->para.bchannel = id;
        } else {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "setup answer wrong chid (ret %d)", id);
                if (id == -1)
                        pc->para.cause = 96;
                else
                        pc->para.cause = 100;
                l3ni1_status_send(pc, pr, NULL);
                return;
        }
        /* Now we are on none mandatory IEs */
        ret = check_infoelements(pc, skb, ie_SETUP_ACKNOWLEDGE);
        if (ERR_IE_COMPREHENSION == ret) {
                l3ni1_std_ie_err(pc, ret);
                return;
        }
        L3DelTimer(&pc->timer);
        newl3state(pc, 2);
        L3AddTimer(&pc->timer, T304, CC_T304);
        if (ret) /* STATUS for none mandatory IE errors after actions are taken */
                l3ni1_std_ie_err(pc, ret);
        pc->st->l3.l3l4(pc->st, CC_MORE_INFO | INDICATION, pc);
}

static void
l3ni1_disconnect(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        u_char *p;
        int ret;
        u_char cause = 0;

        StopAllL3Timer(pc);
        if ((ret = l3ni1_get_cause(pc, skb))) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "DISC get_cause ret(%d)", ret);
                if (ret < 0)
                        cause = 96;
                else if (ret > 0)
                        cause = 100;
        }
        if ((p = findie(skb->data, skb->len, IE_FACILITY, 0)))
                l3ni1_parse_facility(pc->st, pc, pc->callref, p);
        ret = check_infoelements(pc, skb, ie_DISCONNECT);
        if (ERR_IE_COMPREHENSION == ret)
                cause = 96;
        else if ((!cause) && (ERR_IE_UNRECOGNIZED == ret))
                cause = 99;
        ret = pc->state;
        newl3state(pc, 12);
        if (cause)
                newl3state(pc, 19);
        if (11 != ret)
                pc->st->l3.l3l4(pc->st, CC_DISCONNECT | INDICATION, pc);
        else if (!cause)
                l3ni1_release_req(pc, pr, NULL);
        if (cause) {
                l3ni1_message_cause(pc, MT_RELEASE, cause);
                L3AddTimer(&pc->timer, T308, CC_T308_1);
        }
}

static void
l3ni1_connect(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int ret;

        ret = check_infoelements(pc, skb, ie_CONNECT);
        if (ERR_IE_COMPREHENSION == ret) {
                l3ni1_std_ie_err(pc, ret);
                return;
        }
        L3DelTimer(&pc->timer); /* T310 */
        newl3state(pc, 10);
        pc->para.chargeinfo = 0;
        /* here should inserted COLP handling KKe */
        if (ret)
                l3ni1_std_ie_err(pc, ret);
        pc->st->l3.l3l4(pc->st, CC_SETUP | CONFIRM, pc);
}

static void
l3ni1_alerting(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int ret;

        ret = check_infoelements(pc, skb, ie_ALERTING);
        if (ERR_IE_COMPREHENSION == ret) {
                l3ni1_std_ie_err(pc, ret);
                return;
        }
        L3DelTimer(&pc->timer); /* T304 */
        newl3state(pc, 4);
        if (ret)
                l3ni1_std_ie_err(pc, ret);
        pc->st->l3.l3l4(pc->st, CC_ALERTING | INDICATION, pc);
}

static void
l3ni1_setup(struct l3_process *pc, u_char pr, void *arg)
{
        u_char *p;
        int bcfound = 0;
        char tmp[80];
        struct sk_buff *skb = arg;
        int id;
        int err = 0;

        /*
         * Bearer Capabilities
         */
        p = skb->data;
        /* only the first occurrence 'll be detected ! */
        if ((p = findie(p, skb->len, 0x04, 0))) {
                if ((p[1] < 2) || (p[1] > 11))
                        err = 1;
                else {
                        pc->para.setup.si2 = 0;
                        switch (p[2] & 0x7f) {
                        case 0x00: /* Speech */
                        case 0x10: /* 3.1 Khz audio */
                                pc->para.setup.si1 = 1;
                                break;
                        case 0x08: /* Unrestricted digital information */
                                pc->para.setup.si1 = 7;
/* JIM, 05.11.97 I wanna set service indicator 2 */
#if EXT_BEARER_CAPS
                                pc->para.setup.si2 = DecodeSI2(skb);
#endif
                                break;
                        case 0x09: /* Restricted digital information */
                                pc->para.setup.si1 = 2;
                                break;
                        case 0x11:
                                /* Unrestr. digital information  with
                                 * tones/announcements ( or 7 kHz audio
                                 */
                                pc->para.setup.si1 = 3;
                                break;
                        case 0x18: /* Video */
                                pc->para.setup.si1 = 4;
                                break;
                        default:
                                err = 2;
                                break;
                        }
                        switch (p[3] & 0x7f) {
                        case 0x40: /* packed mode */
                                pc->para.setup.si1 = 8;
                                break;
                        case 0x10: /* 64 kbit */
                        case 0x11: /* 2*64 kbit */
                        case 0x13: /* 384 kbit */
                        case 0x15: /* 1536 kbit */
                        case 0x17: /* 1920 kbit */
                                pc->para.moderate = p[3] & 0x7f;
                                break;
                        default:
                                err = 3;
                                break;
                        }
                }
                if (pc->debug & L3_DEB_SI)
                        l3_debug(pc->st, "SI=%d, AI=%d",
                                 pc->para.setup.si1, pc->para.setup.si2);
                if (err) {
                        if (pc->debug & L3_DEB_WARN)
                                l3_debug(pc->st, "setup with wrong bearer(l=%d:%x,%x)",
                                         p[1], p[2], p[3]);
                        pc->para.cause = 100;
                        l3ni1_msg_without_setup(pc, pr, NULL);
                        return;
                }
        } else {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "setup without bearer capabilities");
                /* ETS 300-104 1.3.3 */
                pc->para.cause = 96;
                l3ni1_msg_without_setup(pc, pr, NULL);
                return;
        }
        /*
         * Channel Identification
         */
        if ((id = l3ni1_get_channel_id(pc, skb)) >= 0) {
                if ((pc->para.bchannel = id)) {
                        if ((3 == id) && (0x10 == pc->para.moderate)) {
                                if (pc->debug & L3_DEB_WARN)
                                        l3_debug(pc->st, "setup with wrong chid %x",
                                                 id);
                                pc->para.cause = 100;
                                l3ni1_msg_without_setup(pc, pr, NULL);
                                return;
                        }
                        bcfound++;
                } else
                { if (pc->debug & L3_DEB_WARN)
                                l3_debug(pc->st, "setup without bchannel, call waiting");
                        bcfound++;
                }
        } else {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "setup with wrong chid ret %d", id);
                if (id == -1)
                        pc->para.cause = 96;
                else
                        pc->para.cause = 100;
                l3ni1_msg_without_setup(pc, pr, NULL);
                return;
        }
        /* Now we are on none mandatory IEs */
        err = check_infoelements(pc, skb, ie_SETUP);
        if (ERR_IE_COMPREHENSION == err) {
                pc->para.cause = 96;
                l3ni1_msg_without_setup(pc, pr, NULL);
                return;
        }
        p = skb->data;
        if ((p = findie(p, skb->len, 0x70, 0)))
                iecpy(pc->para.setup.eazmsn, p, 1);
        else
                pc->para.setup.eazmsn[0] = 0;

        p = skb->data;
        if ((p = findie(p, skb->len, 0x71, 0))) {
                /* Called party subaddress */
                if ((p[1] >= 2) && (p[2] == 0x80) && (p[3] == 0x50)) {
                        tmp[0] = '.';
                        iecpy(&tmp[1], p, 2);
                        strcat(pc->para.setup.eazmsn, tmp);
                } else if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "wrong called subaddress");
        }
        p = skb->data;
        if ((p = findie(p, skb->len, 0x6c, 0))) {
                pc->para.setup.plan = p[2];
                if (p[2] & 0x80) {
                        iecpy(pc->para.setup.phone, p, 1);
                        pc->para.setup.screen = 0;
                } else {
                        iecpy(pc->para.setup.phone, p, 2);
                        pc->para.setup.screen = p[3];
                }
        } else {
                pc->para.setup.phone[0] = 0;
                pc->para.setup.plan = 0;
                pc->para.setup.screen = 0;
        }
        p = skb->data;
        if ((p = findie(p, skb->len, 0x6d, 0))) {
                /* Calling party subaddress */
                if ((p[1] >= 2) && (p[2] == 0x80) && (p[3] == 0x50)) {
                        tmp[0] = '.';
                        iecpy(&tmp[1], p, 2);
                        strcat(pc->para.setup.phone, tmp);
                } else if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "wrong calling subaddress");
        }
        newl3state(pc, 6);
        if (err) /* STATUS for none mandatory IE errors after actions are taken */
                l3ni1_std_ie_err(pc, err);
        pc->st->l3.l3l4(pc->st, CC_SETUP | INDICATION, pc);
}

static void
l3ni1_reset(struct l3_process *pc, u_char pr, void *arg)
{
        ni1_release_l3_process(pc);
}

static void
l3ni1_disconnect_req(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb;
        u_char tmp[16 + 40];
        u_char *p = tmp;
        int l;
        u_char cause = 16;

        if (pc->para.cause != NO_CAUSE)
                cause = pc->para.cause;

        StopAllL3Timer(pc);

        MsgHead(p, pc->callref, MT_DISCONNECT);

        *p++ = IE_CAUSE;
        *p++ = 0x2;
        *p++ = 0x80;
        *p++ = cause | 0x80;

        if (pc->prot.ni1.uus1_data[0])
        { *p++ = IE_USER_USER; /* UUS info element */
                *p++ = strlen(pc->prot.ni1.uus1_data) + 1;
                *p++ = 0x04; /* IA5 chars */
                strcpy(p, pc->prot.ni1.uus1_data);
                p += strlen(pc->prot.ni1.uus1_data);
                pc->prot.ni1.uus1_data[0] = '\0';
        }

        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        newl3state(pc, 11);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
        L3AddTimer(&pc->timer, T305, CC_T305);
}

static void
l3ni1_setup_rsp(struct l3_process *pc, u_char pr,
                void *arg)
{
        if (!pc->para.bchannel)
        { if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "D-chan connect for waiting call");
                l3ni1_disconnect_req(pc, pr, arg);
                return;
        }
        newl3state(pc, 8);
        if (pc->debug & L3_DEB_WARN)
                l3_debug(pc->st, "D-chan connect for waiting call");
        l3ni1_message_plus_chid(pc, MT_CONNECT); /* GE 05/09/00 */
        L3DelTimer(&pc->timer);
        L3AddTimer(&pc->timer, T313, CC_T313);
}

static void
l3ni1_connect_ack(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int ret;

        ret = check_infoelements(pc, skb, ie_CONNECT_ACKNOWLEDGE);
        if (ERR_IE_COMPREHENSION == ret) {
                l3ni1_std_ie_err(pc, ret);
                return;
        }
        newl3state(pc, 10);
        L3DelTimer(&pc->timer);
        if (ret)
                l3ni1_std_ie_err(pc, ret);
        pc->st->l3.l3l4(pc->st, CC_SETUP_COMPL | INDICATION, pc);
}

static void
l3ni1_reject_req(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb;
        u_char tmp[16];
        u_char *p = tmp;
        int l;
        u_char cause = 21;

        if (pc->para.cause != NO_CAUSE)
                cause = pc->para.cause;

        MsgHead(p, pc->callref, MT_RELEASE_COMPLETE);

        *p++ = IE_CAUSE;
        *p++ = 0x2;
        *p++ = 0x80;
        *p++ = cause | 0x80;

        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
        pc->st->l3.l3l4(pc->st, CC_RELEASE | INDICATION, pc);
        newl3state(pc, 0);
        ni1_release_l3_process(pc);
}

static void
l3ni1_release(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        u_char *p;
        int ret, cause = 0;

        StopAllL3Timer(pc);
        if ((ret = l3ni1_get_cause(pc, skb)) > 0) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "REL get_cause ret(%d)", ret);
        } else if (ret < 0)
                pc->para.cause = NO_CAUSE;
        if ((p = findie(skb->data, skb->len, IE_FACILITY, 0))) {
                l3ni1_parse_facility(pc->st, pc, pc->callref, p);
        }
        if ((ret < 0) && (pc->state != 11))
                cause = 96;
        else if (ret > 0)
                cause = 100;
        ret = check_infoelements(pc, skb, ie_RELEASE);
        if (ERR_IE_COMPREHENSION == ret)
                cause = 96;
        else if ((ERR_IE_UNRECOGNIZED == ret) && (!cause))
                cause = 99;
        if (cause)
                l3ni1_message_cause(pc, MT_RELEASE_COMPLETE, cause);
        else
                l3ni1_message(pc, MT_RELEASE_COMPLETE);
        pc->st->l3.l3l4(pc->st, CC_RELEASE | INDICATION, pc);
        newl3state(pc, 0);
        ni1_release_l3_process(pc);
}

static void
l3ni1_alert_req(struct l3_process *pc, u_char pr,
                void *arg)
{
        newl3state(pc, 7);
        if (!pc->prot.ni1.uus1_data[0])
                l3ni1_message(pc, MT_ALERTING);
        else
                l3ni1_msg_with_uus(pc, MT_ALERTING);
}

static void
l3ni1_proceed_req(struct l3_process *pc, u_char pr,
                  void *arg)
{
        newl3state(pc, 9);
        l3ni1_message(pc, MT_CALL_PROCEEDING);
        pc->st->l3.l3l4(pc->st, CC_PROCEED_SEND | INDICATION, pc);
}

static void
l3ni1_setup_ack_req(struct l3_process *pc, u_char pr,
                    void *arg)
{
        newl3state(pc, 25);
        L3DelTimer(&pc->timer);
        L3AddTimer(&pc->timer, T302, CC_T302);
        l3ni1_message(pc, MT_SETUP_ACKNOWLEDGE);
}

/********************************************/
/* deliver a incoming display message to HL */
/********************************************/
static void
l3ni1_deliver_display(struct l3_process *pc, int pr, u_char *infp)
{       u_char len;
        isdn_ctrl ic;
        struct IsdnCardState *cs;
        char *p;

        if (*infp++ != IE_DISPLAY) return;
        if ((len = *infp++) > 80) return; /* total length <= 82 */
        if (!pc->chan) return;

        p = ic.parm.display;
        while (len--)
                *p++ = *infp++;
        *p = '\0';
        ic.command = ISDN_STAT_DISPLAY;
        cs = pc->st->l1.hardware;
        ic.driver = cs->myid;
        ic.arg = pc->chan->chan;
        cs->iif.statcallb(&ic);
} /* l3ni1_deliver_display */


static void
l3ni1_progress(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int err = 0;
        u_char *p;

        if ((p = findie(skb->data, skb->len, IE_PROGRESS, 0))) {
                if (p[1] != 2) {
                        err = 1;
                        pc->para.cause = 100;
                } else if (!(p[2] & 0x70)) {
                        switch (p[2]) {
                        case 0x80:
                        case 0x81:
                        case 0x82:
                        case 0x84:
                        case 0x85:
                        case 0x87:
                        case 0x8a:
                                switch (p[3]) {
                                case 0x81:
                                case 0x82:
                                case 0x83:
                                case 0x84:
                                case 0x88:
                                        break;
                                default:
                                        err = 2;
                                        pc->para.cause = 100;
                                        break;
                                }
                                break;
                        default:
                                err = 3;
                                pc->para.cause = 100;
                                break;
                        }
                }
        } else {
                pc->para.cause = 96;
                err = 4;
        }
        if (err) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "progress error %d", err);
                l3ni1_status_send(pc, pr, NULL);
                return;
        }
        /* Now we are on none mandatory IEs */
        err = check_infoelements(pc, skb, ie_PROGRESS);
        if (err)
                l3ni1_std_ie_err(pc, err);
        if (ERR_IE_COMPREHENSION != err)
                pc->st->l3.l3l4(pc->st, CC_PROGRESS | INDICATION, pc);
}

static void
l3ni1_notify(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int err = 0;
        u_char *p;

        if ((p = findie(skb->data, skb->len, IE_NOTIFY, 0))) {
                if (p[1] != 1) {
                        err = 1;
                        pc->para.cause = 100;
                } else {
                        switch (p[2]) {
                        case 0x80:
                        case 0x81:
                        case 0x82:
                                break;
                        default:
                                pc->para.cause = 100;
                                err = 2;
                                break;
                        }
                }
        } else {
                pc->para.cause = 96;
                err = 3;
        }
        if (err) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "notify error %d", err);
                l3ni1_status_send(pc, pr, NULL);
                return;
        }
        /* Now we are on none mandatory IEs */
        err = check_infoelements(pc, skb, ie_NOTIFY);
        if (err)
                l3ni1_std_ie_err(pc, err);
        if (ERR_IE_COMPREHENSION != err)
                pc->st->l3.l3l4(pc->st, CC_NOTIFY | INDICATION, pc);
}

static void
l3ni1_status_enq(struct l3_process *pc, u_char pr, void *arg)
{
        int ret;
        struct sk_buff *skb = arg;

        ret = check_infoelements(pc, skb, ie_STATUS_ENQUIRY);
        l3ni1_std_ie_err(pc, ret);
        pc->para.cause = 30; /* response to STATUS_ENQUIRY */
        l3ni1_status_send(pc, pr, NULL);
}

static void
l3ni1_information(struct l3_process *pc, u_char pr, void *arg)
{
        int ret;
        struct sk_buff *skb = arg;
        u_char *p;
        char tmp[32];

        ret = check_infoelements(pc, skb, ie_INFORMATION);
        if (ret)
                l3ni1_std_ie_err(pc, ret);
        if (pc->state == 25) { /* overlap receiving */
                L3DelTimer(&pc->timer);
                p = skb->data;
                if ((p = findie(p, skb->len, 0x70, 0))) {
                        iecpy(tmp, p, 1);
                        strcat(pc->para.setup.eazmsn, tmp);
                        pc->st->l3.l3l4(pc->st, CC_MORE_INFO | INDICATION, pc);
                }
                L3AddTimer(&pc->timer, T302, CC_T302);
        }
}

/******************************/
/* handle deflection requests */
/******************************/
static void l3ni1_redir_req(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb;
        u_char tmp[128];
        u_char *p = tmp;
        u_char *subp;
        u_char len_phone = 0;
        u_char len_sub = 0;
        int l;


        strcpy(pc->prot.ni1.uus1_data, pc->chan->setup.eazmsn); /* copy uus element if available */
        if (!pc->chan->setup.phone[0])
        { pc->para.cause = -1;
                l3ni1_disconnect_req(pc, pr, arg); /* disconnect immediately */
                return;
        } /* only uus */

        if (pc->prot.ni1.invoke_id)
                free_invoke_id(pc->st, pc->prot.ni1.invoke_id);

        if (!(pc->prot.ni1.invoke_id = new_invoke_id(pc->st)))
                return;

        MsgHead(p, pc->callref, MT_FACILITY);

        for (subp = pc->chan->setup.phone; (*subp) && (*subp != '.'); subp++) len_phone++; /* len of phone number */
        if (*subp++ == '.') len_sub = strlen(subp) + 2; /* length including info subaddress element */

        *p++ = 0x1c;   /* Facility info element */
        *p++ = len_phone + len_sub + 2 + 2 + 8 + 3 + 3; /* length of element */
        *p++ = 0x91;  /* remote operations protocol */
        *p++ = 0xa1;  /* invoke component */

        *p++ = len_phone + len_sub + 2 + 2 + 8 + 3; /* length of data */
        *p++ = 0x02;  /* invoke id tag, integer */
        *p++ = 0x01;  /* length */
        *p++ = pc->prot.ni1.invoke_id;  /* invoke id */
        *p++ = 0x02;  /* operation value tag, integer */
        *p++ = 0x01;  /* length */
        *p++ = 0x0D;  /* Call Deflect */

        *p++ = 0x30;  /* sequence phone number */
        *p++ = len_phone + 2 + 2 + 3 + len_sub; /* length */

        *p++ = 0x30;  /* Deflected to UserNumber */
        *p++ = len_phone + 2 + len_sub; /* length */
        *p++ = 0x80; /* NumberDigits */
        *p++ = len_phone; /* length */
        for (l = 0; l < len_phone; l++)
                *p++ = pc->chan->setup.phone[l];

        if (len_sub)
        { *p++ = 0x04; /* called party subaddress */
                *p++ = len_sub - 2;
                while (*subp) *p++ = *subp++;
        }

        *p++ = 0x01; /* screening identifier */
        *p++ = 0x01;
        *p++ = pc->chan->setup.screen;

        l = p - tmp;
        if (!(skb = l3_alloc_skb(l))) return;
        memcpy(skb_put(skb, l), tmp, l);

        l3_msg(pc->st, DL_DATA | REQUEST, skb);
} /* l3ni1_redir_req */

/********************************************/
/* handle deflection request in early state */
/********************************************/
static void l3ni1_redir_req_early(struct l3_process *pc, u_char pr, void *arg)
{
        l3ni1_proceed_req(pc, pr, arg);
        l3ni1_redir_req(pc, pr, arg);
} /* l3ni1_redir_req_early */

/***********************************************/
/* handle special commands for this protocol.  */
/* Examples are call independent services like */
/* remote operations with dummy  callref.      */
/***********************************************/
static int l3ni1_cmd_global(struct PStack *st, isdn_ctrl *ic)
{ u_char id;
        u_char temp[265];
        u_char *p = temp;
        int i, l, proc_len;
        struct sk_buff *skb;
        struct l3_process *pc = NULL;

        switch (ic->arg)
        { case NI1_CMD_INVOKE:
                        if (ic->parm.ni1_io.datalen < 0) return (-2); /* invalid parameter */

                        for (proc_len = 1, i = ic->parm.ni1_io.proc >> 8; i; i++)
                                i = i >> 8; /* add one byte */
                        l = ic->parm.ni1_io.datalen + proc_len + 8; /* length excluding ie header */
                        if (l > 255)
                                return (-2); /* too long */

                        if (!(id = new_invoke_id(st)))
                                return (0); /* first get a invoke id -> return if no available */

                        i = -1;
                        MsgHead(p, i, MT_FACILITY); /* build message head */
                        *p++ = 0x1C; /* Facility IE */
                        *p++ = l; /* length of ie */
                        *p++ = 0x91; /* remote operations */
                        *p++ = 0xA1; /* invoke */
                        *p++ = l - 3; /* length of invoke */
                        *p++ = 0x02; /* invoke id tag */
                        *p++ = 0x01; /* length is 1 */
                        *p++ = id; /* invoke id */
                        *p++ = 0x02; /* operation */
                        *p++ = proc_len; /* length of operation */

                        for (i = proc_len; i; i--)
                                *p++ = (ic->parm.ni1_io.proc >> (i - 1)) & 0xFF;
                        memcpy(p, ic->parm.ni1_io.data, ic->parm.ni1_io.datalen); /* copy data */
                        l = (p - temp) + ic->parm.ni1_io.datalen; /* total length */

                        if (ic->parm.ni1_io.timeout > 0) {
                                pc = ni1_new_l3_process(st, -1);
                                if (!pc) {
                                        free_invoke_id(st, id);
                                        return (-2);
                                }
                                /* remember id */
                                pc->prot.ni1.ll_id = ic->parm.ni1_io.ll_id;
                                /* and procedure */
                                pc->prot.ni1.proc = ic->parm.ni1_io.proc;
                        }

                        if (!(skb = l3_alloc_skb(l)))
                        { free_invoke_id(st, id);
                                if (pc) ni1_release_l3_process(pc);
                                return (-2);
                        }
                        memcpy(skb_put(skb, l), temp, l);

                        if (pc)
                        { pc->prot.ni1.invoke_id = id; /* remember id */
                                L3AddTimer(&pc->timer, ic->parm.ni1_io.timeout, CC_TNI1_IO | REQUEST);
                        }

                        l3_msg(st, DL_DATA | REQUEST, skb);
                        ic->parm.ni1_io.hl_id = id; /* return id */
                        return (0);

        case NI1_CMD_INVOKE_ABORT:
                if ((pc = l3ni1_search_dummy_proc(st, ic->parm.ni1_io.hl_id)))
                { L3DelTimer(&pc->timer); /* remove timer */
                        ni1_release_l3_process(pc);
                        return (0);
                }
                else
                { l3_debug(st, "l3ni1_cmd_global abort unknown id");
                        return (-2);
                }
                break;

        default:
                l3_debug(st, "l3ni1_cmd_global unknown cmd 0x%lx", ic->arg);
                return (-1);
        } /* switch ic-> arg */
        return (-1);
} /* l3ni1_cmd_global */

static void
l3ni1_io_timer(struct l3_process *pc)
{ isdn_ctrl ic;
        struct IsdnCardState *cs = pc->st->l1.hardware;

        L3DelTimer(&pc->timer); /* remove timer */

        ic.driver = cs->myid;
        ic.command = ISDN_STAT_PROT;
        ic.arg = NI1_STAT_INVOKE_ERR;
        ic.parm.ni1_io.hl_id = pc->prot.ni1.invoke_id;
        ic.parm.ni1_io.ll_id = pc->prot.ni1.ll_id;
        ic.parm.ni1_io.proc = pc->prot.ni1.proc;
        ic.parm.ni1_io.timeout = -1;
        ic.parm.ni1_io.datalen = 0;
        ic.parm.ni1_io.data = NULL;
        free_invoke_id(pc->st, pc->prot.ni1.invoke_id);
        pc->prot.ni1.invoke_id = 0; /* reset id */

        cs->iif.statcallb(&ic);

        ni1_release_l3_process(pc);
} /* l3ni1_io_timer */

static void
l3ni1_release_ind(struct l3_process *pc, u_char pr, void *arg)
{
        u_char *p;
        struct sk_buff *skb = arg;
        int callState = 0;
        p = skb->data;

        if ((p = findie(p, skb->len, IE_CALL_STATE, 0))) {
                p++;
                if (1 == *p++)
                        callState = *p;
        }
        if (callState == 0) {
                /* ETS 300-104 7.6.1, 8.6.1, 10.6.1... and 16.1
                 * set down layer 3 without sending any message
                 */
                pc->st->l3.l3l4(pc->st, CC_RELEASE | INDICATION, pc);
                newl3state(pc, 0);
                ni1_release_l3_process(pc);
        } else {
                pc->st->l3.l3l4(pc->st, CC_IGNORE | INDICATION, pc);
        }
}

static void
l3ni1_dummy(struct l3_process *pc, u_char pr, void *arg)
{
}

static void
l3ni1_t302(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);
        pc->para.loc = 0;
        pc->para.cause = 28; /* invalid number */
        l3ni1_disconnect_req(pc, pr, NULL);
        pc->st->l3.l3l4(pc->st, CC_SETUP_ERR, pc);
}

static void
l3ni1_t303(struct l3_process *pc, u_char pr, void *arg)
{
        if (pc->N303 > 0) {
                pc->N303--;
                L3DelTimer(&pc->timer);
                l3ni1_setup_req(pc, pr, arg);
        } else {
                L3DelTimer(&pc->timer);
                l3ni1_message_cause(pc, MT_RELEASE_COMPLETE, 102);
                pc->st->l3.l3l4(pc->st, CC_NOSETUP_RSP, pc);
                ni1_release_l3_process(pc);
        }
}

static void
l3ni1_t304(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);
        pc->para.loc = 0;
        pc->para.cause = 102;
        l3ni1_disconnect_req(pc, pr, NULL);
        pc->st->l3.l3l4(pc->st, CC_SETUP_ERR, pc);

}

static void
l3ni1_t305(struct l3_process *pc, u_char pr, void *arg)
{
        u_char tmp[16];
        u_char *p = tmp;
        int l;
        struct sk_buff *skb;
        u_char cause = 16;

        L3DelTimer(&pc->timer);
        if (pc->para.cause != NO_CAUSE)
                cause = pc->para.cause;

        MsgHead(p, pc->callref, MT_RELEASE);

        *p++ = IE_CAUSE;
        *p++ = 0x2;
        *p++ = 0x80;
        *p++ = cause | 0x80;

        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        newl3state(pc, 19);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
        L3AddTimer(&pc->timer, T308, CC_T308_1);
}

static void
l3ni1_t310(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);
        pc->para.loc = 0;
        pc->para.cause = 102;
        l3ni1_disconnect_req(pc, pr, NULL);
        pc->st->l3.l3l4(pc->st, CC_SETUP_ERR, pc);
}

static void
l3ni1_t313(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);
        pc->para.loc = 0;
        pc->para.cause = 102;
        l3ni1_disconnect_req(pc, pr, NULL);
        pc->st->l3.l3l4(pc->st, CC_CONNECT_ERR, pc);
}

static void
l3ni1_t308_1(struct l3_process *pc, u_char pr, void *arg)
{
        newl3state(pc, 19);
        L3DelTimer(&pc->timer);
        l3ni1_message(pc, MT_RELEASE);
        L3AddTimer(&pc->timer, T308, CC_T308_2);
}

static void
l3ni1_t308_2(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);
        pc->st->l3.l3l4(pc->st, CC_RELEASE_ERR, pc);
        ni1_release_l3_process(pc);
}

static void
l3ni1_t318(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);
        pc->para.cause = 102;   /* Timer expiry */
        pc->para.loc = 0;       /* local */
        pc->st->l3.l3l4(pc->st, CC_RESUME_ERR, pc);
        newl3state(pc, 19);
        l3ni1_message(pc, MT_RELEASE);
        L3AddTimer(&pc->timer, T308, CC_T308_1);
}

static void
l3ni1_t319(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);
        pc->para.cause = 102;   /* Timer expiry */
        pc->para.loc = 0;       /* local */
        pc->st->l3.l3l4(pc->st, CC_SUSPEND_ERR, pc);
        newl3state(pc, 10);
}

static void
l3ni1_restart(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);
        pc->st->l3.l3l4(pc->st, CC_RELEASE | INDICATION, pc);
        ni1_release_l3_process(pc);
}

static void
l3ni1_status(struct l3_process *pc, u_char pr, void *arg)
{
        u_char *p;
        struct sk_buff *skb = arg;
        int ret;
        u_char cause = 0, callState = 0;

        if ((ret = l3ni1_get_cause(pc, skb))) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "STATUS get_cause ret(%d)", ret);
                if (ret < 0)
                        cause = 96;
                else if (ret > 0)
                        cause = 100;
        }
        if ((p = findie(skb->data, skb->len, IE_CALL_STATE, 0))) {
                p++;
                if (1 == *p++) {
                        callState = *p;
                        if (!ie_in_set(pc, *p, l3_valid_states))
                                cause = 100;
                } else
                        cause = 100;
        } else
                cause = 96;
        if (!cause) { /*  no error before */
                ret = check_infoelements(pc, skb, ie_STATUS);
                if (ERR_IE_COMPREHENSION == ret)
                        cause = 96;
                else if (ERR_IE_UNRECOGNIZED == ret)
                        cause = 99;
        }
        if (cause) {
                u_char tmp;

                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "STATUS error(%d/%d)", ret, cause);
                tmp = pc->para.cause;
                pc->para.cause = cause;
                l3ni1_status_send(pc, 0, NULL);
                if (cause == 99)
                        pc->para.cause = tmp;
                else
                        return;
        }
        cause = pc->para.cause;
        if (((cause & 0x7f) == 111) && (callState == 0)) {
                /* ETS 300-104 7.6.1, 8.6.1, 10.6.1...
                 * if received MT_STATUS with cause == 111 and call
                 * state == 0, then we must set down layer 3
                 */
                pc->st->l3.l3l4(pc->st, CC_RELEASE | INDICATION, pc);
                newl3state(pc, 0);
                ni1_release_l3_process(pc);
        }
}

static void
l3ni1_facility(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int ret;

        ret = check_infoelements(pc, skb, ie_FACILITY);
        l3ni1_std_ie_err(pc, ret);
        {
                u_char *p;
                if ((p = findie(skb->data, skb->len, IE_FACILITY, 0)))
                        l3ni1_parse_facility(pc->st, pc, pc->callref, p);
        }
}

static void
l3ni1_suspend_req(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb;
        u_char tmp[32];
        u_char *p = tmp;
        u_char i, l;
        u_char *msg = pc->chan->setup.phone;

        MsgHead(p, pc->callref, MT_SUSPEND);
        l = *msg++;
        if (l && (l <= 10)) {   /* Max length 10 octets */
                *p++ = IE_CALL_ID;
                *p++ = l;
                for (i = 0; i < l; i++)
                        *p++ = *msg++;
        } else if (l) {
                l3_debug(pc->st, "SUS wrong CALL_ID len %d", l);
                return;
        }
        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
        newl3state(pc, 15);
        L3AddTimer(&pc->timer, T319, CC_T319);
}

static void
l3ni1_suspend_ack(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int ret;

        L3DelTimer(&pc->timer);
        newl3state(pc, 0);
        pc->para.cause = NO_CAUSE;
        pc->st->l3.l3l4(pc->st, CC_SUSPEND | CONFIRM, pc);
        /* We don't handle suspend_ack for IE errors now */
        if ((ret = check_infoelements(pc, skb, ie_SUSPEND_ACKNOWLEDGE)))
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "SUSPACK check ie(%d)", ret);
        ni1_release_l3_process(pc);
}

static void
l3ni1_suspend_rej(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int ret;

        if ((ret = l3ni1_get_cause(pc, skb))) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "SUSP_REJ get_cause ret(%d)", ret);
                if (ret < 0)
                        pc->para.cause = 96;
                else
                        pc->para.cause = 100;
                l3ni1_status_send(pc, pr, NULL);
                return;
        }
        ret = check_infoelements(pc, skb, ie_SUSPEND_REJECT);
        if (ERR_IE_COMPREHENSION == ret) {
                l3ni1_std_ie_err(pc, ret);
                return;
        }
        L3DelTimer(&pc->timer);
        pc->st->l3.l3l4(pc->st, CC_SUSPEND_ERR, pc);
        newl3state(pc, 10);
        if (ret) /* STATUS for none mandatory IE errors after actions are taken */
                l3ni1_std_ie_err(pc, ret);
}

static void
l3ni1_resume_req(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb;
        u_char tmp[32];
        u_char *p = tmp;
        u_char i, l;
        u_char *msg = pc->para.setup.phone;

        MsgHead(p, pc->callref, MT_RESUME);

        l = *msg++;
        if (l && (l <= 10)) {   /* Max length 10 octets */
                *p++ = IE_CALL_ID;
                *p++ = l;
                for (i = 0; i < l; i++)
                        *p++ = *msg++;
        } else if (l) {
                l3_debug(pc->st, "RES wrong CALL_ID len %d", l);
                return;
        }
        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
        newl3state(pc, 17);
        L3AddTimer(&pc->timer, T318, CC_T318);
}

static void
l3ni1_resume_ack(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int id, ret;

        if ((id = l3ni1_get_channel_id(pc, skb)) > 0) {
                if ((0 == id) || ((3 == id) && (0x10 == pc->para.moderate))) {
                        if (pc->debug & L3_DEB_WARN)
                                l3_debug(pc->st, "resume ack with wrong chid %x", id);
                        pc->para.cause = 100;
                        l3ni1_status_send(pc, pr, NULL);
                        return;
                }
                pc->para.bchannel = id;
        } else if (1 == pc->state) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "resume ack without chid (ret %d)", id);
                pc->para.cause = 96;
                l3ni1_status_send(pc, pr, NULL);
                return;
        }
        ret = check_infoelements(pc, skb, ie_RESUME_ACKNOWLEDGE);
        if (ERR_IE_COMPREHENSION == ret) {
                l3ni1_std_ie_err(pc, ret);
                return;
        }
        L3DelTimer(&pc->timer);
        pc->st->l3.l3l4(pc->st, CC_RESUME | CONFIRM, pc);
        newl3state(pc, 10);
        if (ret) /* STATUS for none mandatory IE errors after actions are taken */
                l3ni1_std_ie_err(pc, ret);
}

static void
l3ni1_resume_rej(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;
        int ret;

        if ((ret = l3ni1_get_cause(pc, skb))) {
                if (pc->debug & L3_DEB_WARN)
                        l3_debug(pc->st, "RES_REJ get_cause ret(%d)", ret);
                if (ret < 0)
                        pc->para.cause = 96;
                else
                        pc->para.cause = 100;
                l3ni1_status_send(pc, pr, NULL);
                return;
        }
        ret = check_infoelements(pc, skb, ie_RESUME_REJECT);
        if (ERR_IE_COMPREHENSION == ret) {
                l3ni1_std_ie_err(pc, ret);
                return;
        }
        L3DelTimer(&pc->timer);
        pc->st->l3.l3l4(pc->st, CC_RESUME_ERR, pc);
        newl3state(pc, 0);
        if (ret) /* STATUS for none mandatory IE errors after actions are taken */
                l3ni1_std_ie_err(pc, ret);
        ni1_release_l3_process(pc);
}

static void
l3ni1_global_restart(struct l3_process *pc, u_char pr, void *arg)
{
        u_char tmp[32];
        u_char *p;
        u_char ri, ch = 0, chan = 0;
        int l;
        struct sk_buff *skb = arg;
        struct l3_process *up;

        newl3state(pc, 2);
        L3DelTimer(&pc->timer);
        p = skb->data;
        if ((p = findie(p, skb->len, IE_RESTART_IND, 0))) {
                ri = p[2];
                l3_debug(pc->st, "Restart %x", ri);
        } else {
                l3_debug(pc->st, "Restart without restart IE");
                ri = 0x86;
        }
        p = skb->data;
        if ((p = findie(p, skb->len, IE_CHANNEL_ID, 0))) {
                chan = p[2] & 3;
                ch = p[2];
                if (pc->st->l3.debug)
                        l3_debug(pc->st, "Restart for channel %d", chan);
        }
        newl3state(pc, 2);
        up = pc->st->l3.proc;
        while (up) {
                if ((ri & 7) == 7)
                        up->st->lli.l4l3(up->st, CC_RESTART | REQUEST, up);
                else if (up->para.bchannel == chan)
                        up->st->lli.l4l3(up->st, CC_RESTART | REQUEST, up);

                up = up->next;
        }
        p = tmp;
        MsgHead(p, pc->callref, MT_RESTART_ACKNOWLEDGE);
        if (chan) {
                *p++ = IE_CHANNEL_ID;
                *p++ = 1;
                *p++ = ch | 0x80;
        }
        *p++ = 0x79;            /* RESTART Ind */
        *p++ = 1;
        *p++ = ri;
        l = p - tmp;
        if (!(skb = l3_alloc_skb(l)))
                return;
        memcpy(skb_put(skb, l), tmp, l);
        newl3state(pc, 0);
        l3_msg(pc->st, DL_DATA | REQUEST, skb);
}

static void
l3ni1_dl_reset(struct l3_process *pc, u_char pr, void *arg)
{
        pc->para.cause = 0x29;          /* Temporary failure */
        pc->para.loc = 0;
        l3ni1_disconnect_req(pc, pr, NULL);
        pc->st->l3.l3l4(pc->st, CC_SETUP_ERR, pc);
}

static void
l3ni1_dl_release(struct l3_process *pc, u_char pr, void *arg)
{
        newl3state(pc, 0);
        pc->para.cause = 0x1b;          /* Destination out of order */
        pc->para.loc = 0;
        pc->st->l3.l3l4(pc->st, CC_RELEASE | INDICATION, pc);
        release_l3_process(pc);
}

static void
l3ni1_dl_reestablish(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);
        L3AddTimer(&pc->timer, T309, CC_T309);
        l3_msg(pc->st, DL_ESTABLISH | REQUEST, NULL);
}

static void
l3ni1_dl_reest_status(struct l3_process *pc, u_char pr, void *arg)
{
        L3DelTimer(&pc->timer);

        pc->para.cause = 0x1F; /* normal, unspecified */
        l3ni1_status_send(pc, 0, NULL);
}

static void l3ni1_SendSpid(struct l3_process *pc, u_char pr, struct sk_buff *skb, int iNewState)
{
        u_char *p;
        char *pSPID;
        struct Channel *pChan = pc->st->lli.userdata;
        int l;

        if (skb)
                dev_kfree_skb(skb);

        if (!(pSPID = strchr(pChan->setup.eazmsn, ':')))
        {
                printk(KERN_ERR "SPID not supplied in EAZMSN %s\n", pChan->setup.eazmsn);
                newl3state(pc, 0);
                pc->st->l3.l3l2(pc->st, DL_RELEASE | REQUEST, NULL);
                return;
        }

        l = strlen(++pSPID);
        if (!(skb = l3_alloc_skb(5 + l)))
        {
                printk(KERN_ERR "HiSax can't get memory to send SPID\n");
                return;
        }

        p = skb_put(skb, 5);
        *p++ = PROTO_DIS_EURO;
        *p++ = 0;
        *p++ = MT_INFORMATION;
        *p++ = IE_SPID;
        *p++ = l;

        memcpy(skb_put(skb, l), pSPID, l);

        newl3state(pc, iNewState);

        L3DelTimer(&pc->timer);
        L3AddTimer(&pc->timer, TSPID, CC_TSPID);

        pc->st->l3.l3l2(pc->st, DL_DATA | REQUEST, skb);
}

static void l3ni1_spid_send(struct l3_process *pc, u_char pr, void *arg)
{
        l3ni1_SendSpid(pc, pr, arg, 20);
}

static void l3ni1_spid_epid(struct l3_process *pc, u_char pr, void *arg)
{
        struct sk_buff *skb = arg;

        if (skb->data[1] == 0)
                if (skb->data[3] == IE_ENDPOINT_ID)
                {
                        L3DelTimer(&pc->timer);
                        newl3state(pc, 0);
                        l3_msg(pc->st, DL_ESTABLISH | CONFIRM, NULL);
                }
        dev_kfree_skb(skb);
}

static void l3ni1_spid_tout(struct l3_process *pc, u_char pr, void *arg)
{
        if (pc->state < 22)
                l3ni1_SendSpid(pc, pr, arg, pc->state + 1);
        else
        {
                L3DelTimer(&pc->timer);
                dev_kfree_skb(arg);

                printk(KERN_ERR "SPID not accepted\n");
                newl3state(pc, 0);
                pc->st->l3.l3l2(pc->st, DL_RELEASE | REQUEST, NULL);
        }
}

/* *INDENT-OFF* */
static struct stateentry downstatelist[] =
{
        {SBIT(0),
         CC_SETUP | REQUEST, l3ni1_setup_req},
        {SBIT(0),
         CC_RESUME | REQUEST, l3ni1_resume_req},
        {SBIT(1) | SBIT(2) | SBIT(3) | SBIT(4) | SBIT(6) | SBIT(7) | SBIT(8) | SBIT(9) | SBIT(10) | SBIT(25),
         CC_DISCONNECT | REQUEST, l3ni1_disconnect_req},
        {SBIT(12),
         CC_RELEASE | REQUEST, l3ni1_release_req},
        {ALL_STATES,
         CC_RESTART | REQUEST, l3ni1_restart},
        {SBIT(6) | SBIT(25),
         CC_IGNORE | REQUEST, l3ni1_reset},
        {SBIT(6) | SBIT(25),
         CC_REJECT | REQUEST, l3ni1_reject_req},
        {SBIT(6) | SBIT(25),
         CC_PROCEED_SEND | REQUEST, l3ni1_proceed_req},
        {SBIT(6),
         CC_MORE_INFO | REQUEST, l3ni1_setup_ack_req},
        {SBIT(25),
         CC_MORE_INFO | REQUEST, l3ni1_dummy},
        {SBIT(6) | SBIT(9) | SBIT(25),
         CC_ALERTING | REQUEST, l3ni1_alert_req},
        {SBIT(6) | SBIT(7) | SBIT(9) | SBIT(25),
         CC_SETUP | RESPONSE, l3ni1_setup_rsp},
        {SBIT(10),
         CC_SUSPEND | REQUEST, l3ni1_suspend_req},
        {SBIT(7) | SBIT(9) | SBIT(25),
         CC_REDIR | REQUEST, l3ni1_redir_req},
        {SBIT(6),
         CC_REDIR | REQUEST, l3ni1_redir_req_early},
        {SBIT(9) | SBIT(25),
         CC_DISCONNECT | REQUEST, l3ni1_disconnect_req},
        {SBIT(25),
         CC_T302, l3ni1_t302},
        {SBIT(1),
         CC_T303, l3ni1_t303},
        {SBIT(2),
         CC_T304, l3ni1_t304},
        {SBIT(3),
         CC_T310, l3ni1_t310},
        {SBIT(8),
         CC_T313, l3ni1_t313},
        {SBIT(11),
         CC_T305, l3ni1_t305},
        {SBIT(15),
         CC_T319, l3ni1_t319},
        {SBIT(17),
         CC_T318, l3ni1_t318},
        {SBIT(19),
         CC_T308_1, l3ni1_t308_1},
        {SBIT(19),
         CC_T308_2, l3ni1_t308_2},
        {SBIT(10),
         CC_T309, l3ni1_dl_release},
        { SBIT(20) | SBIT(21) | SBIT(22),
          CC_TSPID, l3ni1_spid_tout },
};

static struct stateentry datastatelist[] =
{
        {ALL_STATES,
         MT_STATUS_ENQUIRY, l3ni1_status_enq},
        {ALL_STATES,
         MT_FACILITY, l3ni1_facility},
        {SBIT(19),
         MT_STATUS, l3ni1_release_ind},
        {ALL_STATES,
         MT_STATUS, l3ni1_status},
        {SBIT(0),
         MT_SETUP, l3ni1_setup},
        {SBIT(6) | SBIT(7) | SBIT(8) | SBIT(9) | SBIT(10) | SBIT(11) | SBIT(12) |
         SBIT(15) | SBIT(17) | SBIT(19) | SBIT(25),
         MT_SETUP, l3ni1_dummy},
        {SBIT(1) | SBIT(2),
         MT_CALL_PROCEEDING, l3ni1_call_proc},
        {SBIT(1),
         MT_SETUP_ACKNOWLEDGE, l3ni1_setup_ack},
        {SBIT(2) | SBIT(3),
         MT_ALERTING, l3ni1_alerting},
        {SBIT(2) | SBIT(3),
         MT_PROGRESS, l3ni1_progress},
        {SBIT(2) | SBIT(3) | SBIT(4) | SBIT(7) | SBIT(8) | SBIT(9) | SBIT(10) |
         SBIT(11) | SBIT(12) | SBIT(15) | SBIT(17) | SBIT(19) | SBIT(25),
         MT_INFORMATION, l3ni1_information},
        {SBIT(10) | SBIT(11) | SBIT(15),
         MT_NOTIFY, l3ni1_notify},
        {SBIT(0) | SBIT(1) | SBIT(2) | SBIT(3) | SBIT(4) | SBIT(7) | SBIT(8) | SBIT(10) |
         SBIT(11) | SBIT(12) | SBIT(15) | SBIT(17) | SBIT(19) | SBIT(25),
         MT_RELEASE_COMPLETE, l3ni1_release_cmpl},
        {SBIT(1) | SBIT(2) | SBIT(3) | SBIT(4) | SBIT(7) | SBIT(8) | SBIT(9) | SBIT(10) | SBIT(11) | SBIT(12) | SBIT(15) | SBIT(17) | SBIT(25),
         MT_RELEASE, l3ni1_release},
        {SBIT(19),  MT_RELEASE, l3ni1_release_ind},
        {SBIT(1) | SBIT(2) | SBIT(3) | SBIT(4) | SBIT(7) | SBIT(8) | SBIT(9) | SBIT(10) | SBIT(11) | SBIT(15) | SBIT(17) | SBIT(25),
         MT_DISCONNECT, l3ni1_disconnect},
        {SBIT(19),
         MT_DISCONNECT, l3ni1_dummy},
        {SBIT(1) | SBIT(2) | SBIT(3) | SBIT(4),
         MT_CONNECT, l3ni1_connect},
        {SBIT(8),
         MT_CONNECT_ACKNOWLEDGE, l3ni1_connect_ack},
        {SBIT(15),
         MT_SUSPEND_ACKNOWLEDGE, l3ni1_suspend_ack},
        {SBIT(15),
         MT_SUSPEND_REJECT, l3ni1_suspend_rej},
        {SBIT(17),
         MT_RESUME_ACKNOWLEDGE, l3ni1_resume_ack},
        {SBIT(17),
         MT_RESUME_REJECT, l3ni1_resume_rej},
};

static struct stateentry globalmes_list[] =
{
        {ALL_STATES,
         MT_STATUS, l3ni1_status},
        {SBIT(0),
         MT_RESTART, l3ni1_global_restart},
/*      {SBIT(1),
        MT_RESTART_ACKNOWLEDGE, l3ni1_restart_ack},
*/
        { SBIT(0), MT_DL_ESTABLISHED, l3ni1_spid_send },
        { SBIT(20) | SBIT(21) | SBIT(22), MT_INFORMATION, l3ni1_spid_epid },
};

static struct stateentry manstatelist[] =
{
        {SBIT(2),
         DL_ESTABLISH | INDICATION, l3ni1_dl_reset},
        {SBIT(10),
         DL_ESTABLISH | CONFIRM, l3ni1_dl_reest_status},
        {SBIT(10),
         DL_RELEASE | INDICATION, l3ni1_dl_reestablish},
        {ALL_STATES,
         DL_RELEASE | INDICATION, l3ni1_dl_release},
};

/* *INDENT-ON* */


static void
global_handler(struct PStack *st, int mt, struct sk_buff *skb)
{
        u_char tmp[16];
        u_char *p = tmp;
        int l;
        int i;
        struct l3_process *proc = st->l3.global;

        if (skb)
                proc->callref = skb->data[2]; /* cr flag */
        else
                proc->callref = 0;
        for (i = 0; i < ARRAY_SIZE(globalmes_list); i++)
                if ((mt == globalmes_list[i].primitive) &&
                    ((1 << proc->state) & globalmes_list[i].state))
                        break;
        if (i == ARRAY_SIZE(globalmes_list)) {
                if (st->l3.debug & L3_DEB_STATE) {
                        l3_debug(st, "ni1 global state %d mt %x unhandled",
                                 proc->state, mt);
                }
                MsgHead(p, proc->callref, MT_STATUS);
                *p++ = IE_CAUSE;
                *p++ = 0x2;
                *p++ = 0x80;
                *p++ = 81 | 0x80;       /* invalid cr */
                *p++ = 0x14;            /* CallState */
                *p++ = 0x1;
                *p++ = proc->state & 0x3f;
                l = p - tmp;
                if (!(skb = l3_alloc_skb(l)))
                        return;
                memcpy(skb_put(skb, l), tmp, l);
                l3_msg(proc->st, DL_DATA | REQUEST, skb);
        } else {
                if (st->l3.debug & L3_DEB_STATE) {
                        l3_debug(st, "ni1 global %d mt %x",
                                 proc->state, mt);
                }
                globalmes_list[i].rout(proc, mt, skb);
        }
}

static void
ni1up(struct PStack *st, int pr, void *arg)
{
        int i, mt, cr, callState;
        char *ptr;
        u_char *p;
        struct sk_buff *skb = arg;
        struct l3_process *proc;

        switch (pr) {
        case (DL_DATA | INDICATION):
        case (DL_UNIT_DATA | INDICATION):
                break;
        case (DL_ESTABLISH | INDICATION):
        case (DL_RELEASE | INDICATION):
        case (DL_RELEASE | CONFIRM):
                l3_msg(st, pr, arg);
                return;
                break;

        case (DL_ESTABLISH | CONFIRM):
                global_handler(st, MT_DL_ESTABLISHED, NULL);
                return;

        default:
                printk(KERN_ERR "HiSax ni1up unknown pr=%04x\n", pr);
                return;
        }
        if (skb->len < 3) {
                l3_debug(st, "ni1up frame too short(%d)", skb->len);
                dev_kfree_skb(skb);
                return;
        }

        if (skb->data[0] != PROTO_DIS_EURO) {
                if (st->l3.debug & L3_DEB_PROTERR) {
                        l3_debug(st, "ni1up%sunexpected discriminator %x message len %d",
                                 (pr == (DL_DATA | INDICATION)) ? " " : "(broadcast) ",
                                 skb->data[0], skb->len);
                }
                dev_kfree_skb(skb);
                return;
        }
        cr = getcallref(skb->data);
        if (skb->len < ((skb->data[1] & 0x0f) + 3)) {
                l3_debug(st, "ni1up frame too short(%d)", skb->len);
                dev_kfree_skb(skb);
                return;
        }
        mt = skb->data[skb->data[1] + 2];
        if (st->l3.debug & L3_DEB_STATE)
                l3_debug(st, "ni1up cr %d", cr);
        if (cr == -2) {  /* wrong Callref */
                if (st->l3.debug & L3_DEB_WARN)
                        l3_debug(st, "ni1up wrong Callref");
                dev_kfree_skb(skb);
                return;
        } else if (cr == -1) {  /* Dummy Callref */
                if (mt == MT_FACILITY)
                {
                        if ((p = findie(skb->data, skb->len, IE_FACILITY, 0))) {
                                l3ni1_parse_facility(st, NULL,
                                                     (pr == (DL_DATA | INDICATION)) ? -1 : -2, p);
                                dev_kfree_skb(skb);
                                return;
                        }
                }
                else
                {
                        global_handler(st, mt, skb);
                        return;
                }

                if (st->l3.debug & L3_DEB_WARN)
                        l3_debug(st, "ni1up dummy Callref (no facility msg or ie)");
                dev_kfree_skb(skb);
                return;
        } else if ((((skb->data[1] & 0x0f) == 1) && (0 == (cr & 0x7f))) ||
                   (((skb->data[1] & 0x0f) == 2) && (0 == (cr & 0x7fff)))) {    /* Global CallRef */
                if (st->l3.debug & L3_DEB_STATE)
                        l3_debug(st, "ni1up Global CallRef");
                global_handler(st, mt, skb);
                dev_kfree_skb(skb);
                return;
        } else if (!(proc = getl3proc(st, cr))) {
                /* No transaction process exist, that means no call with
                 * this callreference is active
                 */
                if (mt == MT_SETUP) {
                        /* Setup creates a new transaction process */
                        if (skb->data[2] & 0x80) {
                                /* Setup with wrong CREF flag */
                                if (st->l3.debug & L3_DEB_STATE)
                                        l3_debug(st, "ni1up wrong CRef flag");
                                dev_kfree_skb(skb);
                                return;
                        }
                        if (!(proc = ni1_new_l3_process(st, cr))) {
                                /* May be to answer with RELEASE_COMPLETE and
                                 * CAUSE 0x2f "Resource unavailable", but this
                                 * need a new_l3_process too ... arghh
                                 */
                                dev_kfree_skb(skb);
                                return;
                        }
                } else if (mt == MT_STATUS) {
                        if ((ptr = findie(skb->data, skb->len, IE_CAUSE, 0)) != NULL) {
                                ptr++;
                                if (*ptr++ == 2)
                                        ptr++;
                        }
                        callState = 0;
                        if ((ptr = findie(skb->data, skb->len, IE_CALL_STATE, 0)) != NULL) {
                                ptr++;