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path: root/drivers/isdn/hisax/isdnl3.c
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Diffstat (limited to 'drivers/isdn/hisax/isdnl3.c')
-rw-r--r--drivers/isdn/hisax/isdnl3.c596
1 files changed, 596 insertions, 0 deletions
diff --git a/drivers/isdn/hisax/isdnl3.c b/drivers/isdn/hisax/isdnl3.c
new file mode 100644
index 000000000..c754706f8
--- /dev/null
+++ b/drivers/isdn/hisax/isdnl3.c
@@ -0,0 +1,596 @@
+/* $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, "%s cr %d %d --> %d", __func__,
+ 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);
+}
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