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465 lines
11 KiB
465 lines
11 KiB
/* $Id: tei.c,v 2.20.2.3 2004/01/13 14:31:26 keil Exp $
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*
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* Author Karsten Keil
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* based on the teles driver from Jan den Ouden
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* Copyright by Karsten Keil <keil@isdn4linux.de>
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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* For changes and modifications please read
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* Documentation/isdn/HiSax.cert
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*
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* Thanks to Jan den Ouden
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* Fritz Elfert
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*
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*/
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#include "hisax.h"
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#include "isdnl2.h"
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/random.h>
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const char *tei_revision = "$Revision: 2.20.2.3 $";
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#define ID_REQUEST 1
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#define ID_ASSIGNED 2
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#define ID_DENIED 3
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#define ID_CHK_REQ 4
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#define ID_CHK_RES 5
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#define ID_REMOVE 6
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#define ID_VERIFY 7
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#define TEI_ENTITY_ID 0xf
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static struct Fsm teifsm;
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void tei_handler(struct PStack *st, u_char pr, struct sk_buff *skb);
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enum {
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ST_TEI_NOP,
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ST_TEI_IDREQ,
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ST_TEI_IDVERIFY,
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};
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#define TEI_STATE_COUNT (ST_TEI_IDVERIFY+1)
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static char *strTeiState[] =
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{
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"ST_TEI_NOP",
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"ST_TEI_IDREQ",
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"ST_TEI_IDVERIFY",
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};
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enum {
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EV_IDREQ,
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EV_ASSIGN,
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EV_DENIED,
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EV_CHKREQ,
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EV_REMOVE,
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EV_VERIFY,
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EV_T202,
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};
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#define TEI_EVENT_COUNT (EV_T202+1)
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static char *strTeiEvent[] =
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{
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"EV_IDREQ",
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"EV_ASSIGN",
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"EV_DENIED",
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"EV_CHKREQ",
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"EV_REMOVE",
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"EV_VERIFY",
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"EV_T202",
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};
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static unsigned int
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random_ri(void)
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{
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unsigned int x;
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get_random_bytes(&x, sizeof(x));
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return (x & 0xffff);
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}
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static struct PStack *
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findtei(struct PStack *st, int tei)
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{
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struct PStack *ptr = *(st->l1.stlistp);
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if (tei == 127)
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return (NULL);
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while (ptr)
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if (ptr->l2.tei == tei)
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return (ptr);
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else
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ptr = ptr->next;
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return (NULL);
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}
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static void
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put_tei_msg(struct PStack *st, u_char m_id, unsigned int ri, u_char tei)
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{
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struct sk_buff *skb;
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u_char *bp;
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if (!(skb = alloc_skb(8, GFP_ATOMIC))) {
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printk(KERN_WARNING "HiSax: No skb for TEI manager\n");
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return;
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}
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bp = skb_put(skb, 3);
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bp[0] = (TEI_SAPI << 2);
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bp[1] = (GROUP_TEI << 1) | 0x1;
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bp[2] = UI;
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bp = skb_put(skb, 5);
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bp[0] = TEI_ENTITY_ID;
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bp[1] = ri >> 8;
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bp[2] = ri & 0xff;
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bp[3] = m_id;
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bp[4] = (tei << 1) | 1;
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st->l2.l2l1(st, PH_DATA | REQUEST, skb);
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}
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static void
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tei_id_request(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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if (st->l2.tei != -1) {
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"assign request for allready asigned tei %d",
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st->l2.tei);
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return;
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}
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st->ma.ri = random_ri();
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"assign request ri %d", st->ma.ri);
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put_tei_msg(st, ID_REQUEST, st->ma.ri, 127);
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FsmChangeState(&st->ma.tei_m, ST_TEI_IDREQ);
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FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 1);
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st->ma.N202 = 3;
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}
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static void
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tei_id_assign(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *ost, *st = fi->userdata;
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struct sk_buff *skb = arg;
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struct IsdnCardState *cs;
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int ri, tei;
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ri = ((unsigned int) skb->data[1] << 8) + skb->data[2];
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tei = skb->data[4] >> 1;
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"identity assign ri %d tei %d", ri, tei);
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if ((ost = findtei(st, tei))) { /* same tei is in use */
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if (ri != ost->ma.ri) {
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"possible duplicate assignment tei %d", tei);
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ost->l2.l2tei(ost, MDL_ERROR | RESPONSE, NULL);
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}
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} else if (ri == st->ma.ri) {
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FsmDelTimer(&st->ma.t202, 1);
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FsmChangeState(&st->ma.tei_m, ST_TEI_NOP);
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st->l3.l3l2(st, MDL_ASSIGN | REQUEST, (void *) (long) tei);
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cs = (struct IsdnCardState *) st->l1.hardware;
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cs->cardmsg(cs, MDL_ASSIGN | REQUEST, NULL);
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}
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}
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static void
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tei_id_test_dup(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *ost, *st = fi->userdata;
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struct sk_buff *skb = arg;
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int tei, ri;
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ri = ((unsigned int) skb->data[1] << 8) + skb->data[2];
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tei = skb->data[4] >> 1;
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"foreign identity assign ri %d tei %d", ri, tei);
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if ((ost = findtei(st, tei))) { /* same tei is in use */
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if (ri != ost->ma.ri) { /* and it wasn't our request */
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"possible duplicate assignment tei %d", tei);
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FsmEvent(&ost->ma.tei_m, EV_VERIFY, NULL);
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}
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}
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}
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static void
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tei_id_denied(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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struct sk_buff *skb = arg;
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int ri, tei;
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ri = ((unsigned int) skb->data[1] << 8) + skb->data[2];
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tei = skb->data[4] >> 1;
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"identity denied ri %d tei %d", ri, tei);
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}
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static void
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tei_id_chk_req(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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struct sk_buff *skb = arg;
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int tei;
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tei = skb->data[4] >> 1;
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"identity check req tei %d", tei);
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if ((st->l2.tei != -1) && ((tei == GROUP_TEI) || (tei == st->l2.tei))) {
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FsmDelTimer(&st->ma.t202, 4);
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FsmChangeState(&st->ma.tei_m, ST_TEI_NOP);
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put_tei_msg(st, ID_CHK_RES, random_ri(), st->l2.tei);
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}
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}
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static void
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tei_id_remove(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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struct sk_buff *skb = arg;
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struct IsdnCardState *cs;
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int tei;
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tei = skb->data[4] >> 1;
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"identity remove tei %d", tei);
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if ((st->l2.tei != -1) && ((tei == GROUP_TEI) || (tei == st->l2.tei))) {
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FsmDelTimer(&st->ma.t202, 5);
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FsmChangeState(&st->ma.tei_m, ST_TEI_NOP);
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st->l3.l3l2(st, MDL_REMOVE | REQUEST, NULL);
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cs = (struct IsdnCardState *) st->l1.hardware;
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cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL);
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}
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}
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static void
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tei_id_verify(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"id verify request for tei %d", st->l2.tei);
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put_tei_msg(st, ID_VERIFY, 0, st->l2.tei);
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FsmChangeState(&st->ma.tei_m, ST_TEI_IDVERIFY);
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FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 2);
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st->ma.N202 = 2;
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}
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static void
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tei_id_req_tout(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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struct IsdnCardState *cs;
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if (--st->ma.N202) {
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st->ma.ri = random_ri();
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"assign req(%d) ri %d", 4 - st->ma.N202,
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st->ma.ri);
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put_tei_msg(st, ID_REQUEST, st->ma.ri, 127);
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FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 3);
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} else {
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st->ma.tei_m.printdebug(&st->ma.tei_m, "assign req failed");
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st->l3.l3l2(st, MDL_ERROR | RESPONSE, NULL);
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cs = (struct IsdnCardState *) st->l1.hardware;
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cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL);
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FsmChangeState(fi, ST_TEI_NOP);
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}
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}
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static void
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tei_id_ver_tout(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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struct IsdnCardState *cs;
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if (--st->ma.N202) {
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"id verify req(%d) for tei %d",
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3 - st->ma.N202, st->l2.tei);
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put_tei_msg(st, ID_VERIFY, 0, st->l2.tei);
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FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 4);
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} else {
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"verify req for tei %d failed", st->l2.tei);
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st->l3.l3l2(st, MDL_REMOVE | REQUEST, NULL);
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cs = (struct IsdnCardState *) st->l1.hardware;
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cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL);
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FsmChangeState(fi, ST_TEI_NOP);
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}
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}
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static void
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tei_l1l2(struct PStack *st, int pr, void *arg)
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{
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struct sk_buff *skb = arg;
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int mt;
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if (test_bit(FLG_FIXED_TEI, &st->l2.flag)) {
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dev_kfree_skb(skb);
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return;
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}
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if (pr == (PH_DATA | INDICATION)) {
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if (skb->len < 3) {
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"short mgr frame %ld/3", skb->len);
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} else if ((skb->data[0] != ((TEI_SAPI << 2) | 2)) ||
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(skb->data[1] != ((GROUP_TEI << 1) | 1))) {
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"wrong mgr sapi/tei %x/%x",
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skb->data[0], skb->data[1]);
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} else if ((skb->data[2] & 0xef) != UI) {
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"mgr frame is not ui %x", skb->data[2]);
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} else {
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skb_pull(skb, 3);
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if (skb->len < 5) {
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"short mgr frame %ld/5", skb->len);
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} else if (skb->data[0] != TEI_ENTITY_ID) {
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/* wrong management entity identifier, ignore */
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"tei handler wrong entity id %x",
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skb->data[0]);
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} else {
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mt = skb->data[3];
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if (mt == ID_ASSIGNED)
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FsmEvent(&st->ma.tei_m, EV_ASSIGN, skb);
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else if (mt == ID_DENIED)
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FsmEvent(&st->ma.tei_m, EV_DENIED, skb);
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else if (mt == ID_CHK_REQ)
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FsmEvent(&st->ma.tei_m, EV_CHKREQ, skb);
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else if (mt == ID_REMOVE)
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FsmEvent(&st->ma.tei_m, EV_REMOVE, skb);
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else {
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"tei handler wrong mt %x\n", mt);
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}
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}
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}
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} else {
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"tei handler wrong pr %x\n", pr);
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}
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dev_kfree_skb(skb);
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}
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static void
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tei_l2tei(struct PStack *st, int pr, void *arg)
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{
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struct IsdnCardState *cs;
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if (test_bit(FLG_FIXED_TEI, &st->l2.flag)) {
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if (pr == (MDL_ASSIGN | INDICATION)) {
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if (st->ma.debug)
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st->ma.tei_m.printdebug(&st->ma.tei_m,
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"fixed assign tei %d", st->l2.tei);
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st->l3.l3l2(st, MDL_ASSIGN | REQUEST, (void *) (long) st->l2.tei);
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cs = (struct IsdnCardState *) st->l1.hardware;
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cs->cardmsg(cs, MDL_ASSIGN | REQUEST, NULL);
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}
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return;
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}
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switch (pr) {
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case (MDL_ASSIGN | INDICATION):
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FsmEvent(&st->ma.tei_m, EV_IDREQ, arg);
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break;
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case (MDL_ERROR | REQUEST):
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FsmEvent(&st->ma.tei_m, EV_VERIFY, arg);
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break;
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default:
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break;
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}
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}
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static void
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tei_debug(struct FsmInst *fi, char *fmt, ...)
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{
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va_list args;
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struct PStack *st = fi->userdata;
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va_start(args, fmt);
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VHiSax_putstatus(st->l1.hardware, "tei ", fmt, args);
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va_end(args);
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}
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void
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setstack_tei(struct PStack *st)
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{
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st->l2.l2tei = tei_l2tei;
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st->ma.T202 = 2000; /* T202 2000 milliseconds */
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st->l1.l1tei = tei_l1l2;
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st->ma.debug = 1;
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st->ma.tei_m.fsm = &teifsm;
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st->ma.tei_m.state = ST_TEI_NOP;
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st->ma.tei_m.debug = 1;
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st->ma.tei_m.userdata = st;
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st->ma.tei_m.userint = 0;
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st->ma.tei_m.printdebug = tei_debug;
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FsmInitTimer(&st->ma.tei_m, &st->ma.t202);
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}
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void
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init_tei(struct IsdnCardState *cs, int protocol)
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{
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}
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void
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release_tei(struct IsdnCardState *cs)
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{
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struct PStack *st = cs->stlist;
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while (st) {
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FsmDelTimer(&st->ma.t202, 1);
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st = st->next;
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}
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}
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static struct FsmNode TeiFnList[] __initdata =
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{
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{ST_TEI_NOP, EV_IDREQ, tei_id_request},
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{ST_TEI_NOP, EV_ASSIGN, tei_id_test_dup},
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{ST_TEI_NOP, EV_VERIFY, tei_id_verify},
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{ST_TEI_NOP, EV_REMOVE, tei_id_remove},
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{ST_TEI_NOP, EV_CHKREQ, tei_id_chk_req},
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{ST_TEI_IDREQ, EV_T202, tei_id_req_tout},
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{ST_TEI_IDREQ, EV_ASSIGN, tei_id_assign},
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{ST_TEI_IDREQ, EV_DENIED, tei_id_denied},
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{ST_TEI_IDVERIFY, EV_T202, tei_id_ver_tout},
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{ST_TEI_IDVERIFY, EV_REMOVE, tei_id_remove},
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{ST_TEI_IDVERIFY, EV_CHKREQ, tei_id_chk_req},
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};
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int __init
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TeiNew(void)
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{
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teifsm.state_count = TEI_STATE_COUNT;
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teifsm.event_count = TEI_EVENT_COUNT;
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teifsm.strEvent = strTeiEvent;
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teifsm.strState = strTeiState;
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return FsmNew(&teifsm, TeiFnList, ARRAY_SIZE(TeiFnList));
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}
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void
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TeiFree(void)
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{
|
|
FsmFree(&teifsm);
|
|
}
|
|
|