/* $Id: isdnl3.c,v 2.22.2.3 2004/01/13 14:31:25 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 <linux/init.h> #include <linux/slab.h> #include "hisax.h" #include "isdnl3.h" const char *l3_revision = "$Revision: 2.22.2.3 $"; static struct Fsm l3fsm; enum { ST_L3_LC_REL, ST_L3_LC_ESTAB_WAIT, ST_L3_LC_REL_DELAY, ST_L3_LC_REL_WAIT, ST_L3_LC_ESTAB, }; #define L3_STATE_COUNT (ST_L3_LC_ESTAB + 1) static char *strL3State[] = { "ST_L3_LC_REL", "ST_L3_LC_ESTAB_WAIT", "ST_L3_LC_REL_DELAY", "ST_L3_LC_REL_WAIT", "ST_L3_LC_ESTAB", }; enum { EV_ESTABLISH_REQ, EV_ESTABLISH_IND, EV_ESTABLISH_CNF, EV_RELEASE_REQ, EV_RELEASE_CNF, EV_RELEASE_IND, EV_TIMEOUT, }; #define L3_EVENT_COUNT (EV_TIMEOUT + 1) static char *strL3Event[] = { "EV_ESTABLISH_REQ", "EV_ESTABLISH_IND", "EV_ESTABLISH_CNF", "EV_RELEASE_REQ", "EV_RELEASE_CNF", "EV_RELEASE_IND", "EV_TIMEOUT", }; static __printf(2, 3) void l3m_debug(struct FsmInst *fi, char *fmt, ...) { va_list args; struct PStack *st = fi->userdata; va_start(args, fmt); VHiSax_putstatus(st->l1.hardware, st->l3.debug_id, fmt, args); va_end(args); } u_char * findie(u_char *p, int size, u_char ie, int wanted_set) { int l, codeset, maincodeset; u_char *pend = p + size; /* skip protocol discriminator, callref and message type */ p++; l = (*p++) & 0xf; p += l; p++; codeset = 0; maincodeset = 0; /* while there are bytes left... */ while (p < pend) { if ((*p & 0xf0) == 0x90) { codeset = *p & 0x07; if (!(*p & 0x08)) maincodeset = codeset; } if (*p & 0x80) p++; else { if (codeset == wanted_set) { if (*p == ie) { /* improved length check (Werner Cornelius) */ if ((pend - p) < 2) return (NULL); if (*(p + 1) > (pend - (p + 2))) return (NULL); return (p); } if (*p > ie) return (NULL); } p++; l = *p++; p += l; codeset = maincodeset; } } return (NULL); } int getcallref(u_char *p) { int l, cr = 0; p++; /* prot discr */ if (*p & 0xfe) /* wrong callref BRI only 1 octet*/ return (-2); l = 0xf & *p++; /* callref length */ if (!l) /* dummy CallRef */ return (-1); cr = *p++; return (cr); } static int OrigCallRef = 0; int newcallref(void) { if (OrigCallRef == 127) OrigCallRef = 1; else OrigCallRef++; return (OrigCallRef); } void newl3state(struct l3_process *pc, int state) { if (pc->debug & L3_DEB_STATE) l3_debug(pc->st, "newstate cr %d %d --> %d", pc->callref & 0x7F, pc->state, state); pc->state = state; } static void L3ExpireTimer(struct L3Timer *t) { t->pc->st->lli.l4l3(t->pc->st, t->event, t->pc); } void L3InitTimer(struct l3_process *pc, struct L3Timer *t) { t->pc = pc; t->tl.function = (void *) L3ExpireTimer; t->tl.data = (long) t; init_timer(&t->tl); } void L3DelTimer(struct L3Timer *t) { del_timer(&t->tl); } int L3AddTimer(struct L3Timer *t, int millisec, int event) { if (timer_pending(&t->tl)) { printk(KERN_WARNING "L3AddTimer: timer already active!\n"); return -1; } init_timer(&t->tl); t->event = event; t->tl.expires = jiffies + (millisec * HZ) / 1000; add_timer(&t->tl); return 0; } void StopAllL3Timer(struct l3_process *pc) { L3DelTimer(&pc->timer); } struct sk_buff * l3_alloc_skb(int len) { struct sk_buff *skb; if (!(skb = alloc_skb(len + MAX_HEADER_LEN, GFP_ATOMIC))) { printk(KERN_WARNING "HiSax: No skb for D-channel\n"); return (NULL); } skb_reserve(skb, MAX_HEADER_LEN); return (skb); } static void no_l3_proto(struct PStack *st, int pr, void *arg) { struct sk_buff *skb = arg; HiSax_putstatus(st->l1.hardware, "L3", "no D protocol"); if (skb) { dev_kfree_skb(skb); } } static int no_l3_proto_spec(struct PStack *st, isdn_ctrl *ic) { printk(KERN_WARNING "HiSax: no specific protocol handler for proto %lu\n", ic->arg & 0xFF); return (-1); } struct l3_process *getl3proc(struct PStack *st, int cr) { struct l3_process *p = st->l3.proc; while (p) if (p->callref == cr) return (p); else p = p->next; return (NULL); } struct l3_process *new_l3_process(struct PStack *st, int cr) { struct l3_process *p, *np; if (!(p = kmalloc(sizeof(struct l3_process), GFP_ATOMIC))) { printk(KERN_ERR "HiSax can't get memory for cr %d\n", cr); return (NULL); } if (!st->l3.proc) st->l3.proc = p; else { np = st->l3.proc; while (np->next) np = np->next; np->next = p; } p->next = NULL; p->debug = st->l3.debug; p->callref = cr; p->state = 0; p->chan = NULL; p->st = st; p->N303 = st->l3.N303; L3InitTimer(p, &p->timer); return (p); }; void release_l3_process(struct l3_process *p) { struct l3_process *np, *pp = NULL; if (!p) return; np = p->st->l3.proc; while (np) { if (np == p) { StopAllL3Timer(p); if (pp) pp->next = np->next; else if (!(p->st->l3.proc = np->next) && !test_bit(FLG_PTP, &p->st->l2.flag)) { if (p->debug) l3_debug(p->st, "release_l3_process: last process"); if (skb_queue_empty(&p->st->l3.squeue)) { if (p->debug) l3_debug(p->st, "release_l3_process: release link"); if (p->st->protocol != ISDN_PTYPE_NI1) FsmEvent(&p->st->l3.l3m, EV_RELEASE_REQ, NULL); else FsmEvent(&p->st->l3.l3m, EV_RELEASE_IND, NULL); } else { if (p->debug) l3_debug(p->st, "release_l3_process: not release link"); } } kfree(p); return; } pp = np; np = np->next; } printk(KERN_ERR "HiSax internal L3 error CR(%d) not in list\n", p->callref); l3_debug(p->st, "HiSax internal L3 error CR(%d) not in list", p->callref); }; static void l3ml3p(struct PStack *st, int pr) { struct l3_process *p = st->l3.proc; struct l3_process *np; while (p) { /* p might be kfreed under us, so we need to save where we want to go on */ np = p->next; st->l3.l3ml3(st, pr, p); p = np; } } void setstack_l3dc(struct PStack *st, struct Channel *chanp) { char tmp[64]; st->l3.proc = NULL; st->l3.global = NULL; skb_queue_head_init(&st->l3.squeue); st->l3.l3m.fsm = &l3fsm; st->l3.l3m.state = ST_L3_LC_REL; st->l3.l3m.debug = 1; st->l3.l3m.userdata = st; st->l3.l3m.userint = 0; st->l3.l3m.printdebug = l3m_debug; FsmInitTimer(&st->l3.l3m, &st->l3.l3m_timer); strcpy(st->l3.debug_id, "L3DC "); st->lli.l4l3_proto = no_l3_proto_spec; #ifdef CONFIG_HISAX_EURO if (st->protocol == ISDN_PTYPE_EURO) { setstack_dss1(st); } else #endif #ifdef CONFIG_HISAX_NI1 if (st->protocol == ISDN_PTYPE_NI1) { setstack_ni1(st); } else #endif #ifdef CONFIG_HISAX_1TR6 if (st->protocol == ISDN_PTYPE_1TR6) { setstack_1tr6(st); } else #endif if (st->protocol == ISDN_PTYPE_LEASED) { st->lli.l4l3 = no_l3_proto; st->l2.l2l3 = no_l3_proto; st->l3.l3ml3 = no_l3_proto; printk(KERN_INFO "HiSax: Leased line mode\n"); } else { st->lli.l4l3 = no_l3_proto; st->l2.l2l3 = no_l3_proto; st->l3.l3ml3 = no_l3_proto; sprintf(tmp, "protocol %s not supported", (st->protocol == ISDN_PTYPE_1TR6) ? "1tr6" : (st->protocol == ISDN_PTYPE_EURO) ? "euro" : (st->protocol == ISDN_PTYPE_NI1) ? "ni1" : "unknown"); printk(KERN_WARNING "HiSax: %s\n", tmp); st->protocol = -1; } } static void isdnl3_trans(struct PStack *st, int pr, void *arg) { st->l3.l3l2(st, pr, arg); } void releasestack_isdnl3(struct PStack *st) { while (st->l3.proc) release_l3_process(st->l3.proc); if (st->l3.global) { StopAllL3Timer(st->l3.global); kfree(st->l3.global); st->l3.global = NULL; } FsmDelTimer(&st->l3.l3m_timer, 54); skb_queue_purge(&st->l3.squeue); } void setstack_l3bc(struct PStack *st, struct Channel *chanp) { st->l3.proc = NULL; st->l3.global = NULL; skb_queue_head_init(&st->l3.squeue); st->l3.l3m.fsm = &l3fsm; st->l3.l3m.state = ST_L3_LC_REL; st->l3.l3m.debug = 1; st->l3.l3m.userdata = st; st->l3.l3m.userint = 0; st->l3.l3m.printdebug = l3m_debug; strcpy(st->l3.debug_id, "L3BC "); st->lli.l4l3 = isdnl3_trans; } #define DREL_TIMER_VALUE 40000 static void lc_activate(struct FsmInst *fi, int event, void *arg) { struct PStack *st = fi->userdata; FsmChangeState(fi, ST_L3_LC_ESTAB_WAIT); st->l3.l3l2(st, DL_ESTABLISH | REQUEST, NULL); } static void lc_connect(struct FsmInst *fi, int event, void *arg) { struct PStack *st = fi->userdata; struct sk_buff *skb = arg; int dequeued = 0; FsmChangeState(fi, ST_L3_LC_ESTAB); while ((skb = skb_dequeue(&st->l3.squeue))) { st->l3.l3l2(st, DL_DATA | REQUEST, skb); dequeued++; } if ((!st->l3.proc) && dequeued) { if (st->l3.debug) l3_debug(st, "lc_connect: release link"); FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL); } else l3ml3p(st, DL_ESTABLISH | INDICATION); } static void lc_connected(struct FsmInst *fi, int event, void *arg) { struct PStack *st = fi->userdata; struct sk_buff *skb = arg; int dequeued = 0; FsmDelTimer(&st->l3.l3m_timer, 51); FsmChangeState(fi, ST_L3_LC_ESTAB); while ((skb = skb_dequeue(&st->l3.squeue))) { st->l3.l3l2(st, DL_DATA | REQUEST, skb); dequeued++; } if ((!st->l3.proc) && dequeued) { if (st->l3.debug) l3_debug(st, "lc_connected: release link"); FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL); } else l3ml3p(st, DL_ESTABLISH | CONFIRM); } static void lc_start_delay(struct FsmInst *fi, int event, void *arg) { struct PStack *st = fi->userdata; FsmChangeState(fi, ST_L3_LC_REL_DELAY); FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50); } static void lc_start_delay_check(struct FsmInst *fi, int event, void *arg) /* 20/09/00 - GE timer not user for NI-1 as layer 2 should stay up */ { struct PStack *st = fi->userdata; FsmChangeState(fi, ST_L3_LC_REL_DELAY); /* 19/09/00 - GE timer not user for NI-1 */ if (st->protocol != ISDN_PTYPE_NI1) FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50); } static void lc_release_req(struct FsmInst *fi, int event, void *arg) { struct PStack *st = fi->userdata; if (test_bit(FLG_L2BLOCK, &st->l2.flag)) { if (st->l3.debug) l3_debug(st, "lc_release_req: l2 blocked"); /* restart release timer */ FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 51); } else { FsmChangeState(fi, ST_L3_LC_REL_WAIT); st->l3.l3l2(st, DL_RELEASE | REQUEST, NULL); } } static void lc_release_ind(struct FsmInst *fi, int event, void *arg) { struct PStack *st = fi->userdata; FsmDelTimer(&st->l3.l3m_timer, 52); FsmChangeState(fi, ST_L3_LC_REL); skb_queue_purge(&st->l3.squeue); l3ml3p(st, DL_RELEASE | INDICATION); } static void lc_release_cnf(struct FsmInst *fi, int event, void *arg) { struct PStack *st = fi->userdata; FsmChangeState(fi, ST_L3_LC_REL); skb_queue_purge(&st->l3.squeue); l3ml3p(st, DL_RELEASE | CONFIRM); } /* *INDENT-OFF* */ static struct FsmNode L3FnList[] __initdata = { {ST_L3_LC_REL, EV_ESTABLISH_REQ, lc_activate}, {ST_L3_LC_REL, EV_ESTABLISH_IND, lc_connect}, {ST_L3_LC_REL, EV_ESTABLISH_CNF, lc_connect}, {ST_L3_LC_ESTAB_WAIT, EV_ESTABLISH_CNF, lc_connected}, {ST_L3_LC_ESTAB_WAIT, EV_RELEASE_REQ, lc_start_delay}, {ST_L3_LC_ESTAB_WAIT, EV_RELEASE_IND, lc_release_ind}, {ST_L3_LC_ESTAB, EV_RELEASE_IND, lc_release_ind}, {ST_L3_LC_ESTAB, EV_RELEASE_REQ, lc_start_delay_check}, {ST_L3_LC_REL_DELAY, EV_RELEASE_IND, lc_release_ind}, {ST_L3_LC_REL_DELAY, EV_ESTABLISH_REQ, lc_connected}, {ST_L3_LC_REL_DELAY, EV_TIMEOUT, lc_release_req}, {ST_L3_LC_REL_WAIT, EV_RELEASE_CNF, lc_release_cnf}, {ST_L3_LC_REL_WAIT, EV_ESTABLISH_REQ, lc_activate}, }; /* *INDENT-ON* */ void l3_msg(struct PStack *st, int pr, void *arg) { switch (pr) { case (DL_DATA | REQUEST): if (st->l3.l3m.state == ST_L3_LC_ESTAB) { st->l3.l3l2(st, pr, arg); } else { struct sk_buff *skb = arg; skb_queue_tail(&st->l3.squeue, skb); FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL); } break; case (DL_ESTABLISH | REQUEST): FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL); break; case (DL_ESTABLISH | CONFIRM): FsmEvent(&st->l3.l3m, EV_ESTABLISH_CNF, NULL); break; case (DL_ESTABLISH | INDICATION): FsmEvent(&st->l3.l3m, EV_ESTABLISH_IND, NULL); break; case (DL_RELEASE | INDICATION): FsmEvent(&st->l3.l3m, EV_RELEASE_IND, NULL); break; case (DL_RELEASE | CONFIRM): FsmEvent(&st->l3.l3m, EV_RELEASE_CNF, NULL); break; case (DL_RELEASE | REQUEST): FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL); break; } } int __init Isdnl3New(void) { l3fsm.state_count = L3_STATE_COUNT; l3fsm.event_count = L3_EVENT_COUNT; l3fsm.strEvent = strL3Event; l3fsm.strState = strL3State; return FsmNew(&l3fsm, L3FnList, ARRAY_SIZE(L3FnList)); } void Isdnl3Free(void) { FsmFree(&l3fsm); }