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linux-next/drivers/isdn/hisax/tei.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

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