diff options
Diffstat (limited to 'drivers/isdn/hisax/tei.c')
| -rw-r--r-- | drivers/isdn/hisax/tei.c | 465 |
1 files changed, 465 insertions, 0 deletions
diff --git a/drivers/isdn/hisax/tei.c b/drivers/isdn/hisax/tei.c new file mode 100644 index 000000000..9195f9fd6 --- /dev/null +++ b/drivers/isdn/hisax/tei.c @@ -0,0 +1,465 @@ +/* $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/gfp.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", +}; + +static 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 already assigned 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}, +}; + +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, ARRAY_SIZE(TeiFnList)); +} + +void +TeiFree(void) +{ + FsmFree(&teifsm); +} |