595 lines
13 KiB
C
595 lines
13 KiB
C
/* $Id: isdnl3.c,v 2.22.2.3 2004/01/13 14:31:25 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 <linux/init.h>
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#include <linux/slab.h>
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#include "hisax.h"
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#include "isdnl3.h"
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const char *l3_revision = "$Revision: 2.22.2.3 $";
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static struct Fsm l3fsm;
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enum {
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ST_L3_LC_REL,
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ST_L3_LC_ESTAB_WAIT,
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ST_L3_LC_REL_DELAY,
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ST_L3_LC_REL_WAIT,
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ST_L3_LC_ESTAB,
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};
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#define L3_STATE_COUNT (ST_L3_LC_ESTAB + 1)
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static char *strL3State[] =
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{
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"ST_L3_LC_REL",
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"ST_L3_LC_ESTAB_WAIT",
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"ST_L3_LC_REL_DELAY",
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"ST_L3_LC_REL_WAIT",
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"ST_L3_LC_ESTAB",
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};
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enum {
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EV_ESTABLISH_REQ,
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EV_ESTABLISH_IND,
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EV_ESTABLISH_CNF,
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EV_RELEASE_REQ,
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EV_RELEASE_CNF,
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EV_RELEASE_IND,
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EV_TIMEOUT,
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};
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#define L3_EVENT_COUNT (EV_TIMEOUT + 1)
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static char *strL3Event[] =
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{
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"EV_ESTABLISH_REQ",
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"EV_ESTABLISH_IND",
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"EV_ESTABLISH_CNF",
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"EV_RELEASE_REQ",
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"EV_RELEASE_CNF",
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"EV_RELEASE_IND",
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"EV_TIMEOUT",
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};
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static __printf(2, 3) void
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l3m_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, st->l3.debug_id, fmt, args);
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va_end(args);
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}
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u_char *
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findie(u_char *p, int size, u_char ie, int wanted_set)
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{
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int l, codeset, maincodeset;
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u_char *pend = p + size;
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/* skip protocol discriminator, callref and message type */
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p++;
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l = (*p++) & 0xf;
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p += l;
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p++;
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codeset = 0;
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maincodeset = 0;
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/* while there are bytes left... */
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while (p < pend) {
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if ((*p & 0xf0) == 0x90) {
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codeset = *p & 0x07;
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if (!(*p & 0x08))
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maincodeset = codeset;
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}
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if (*p & 0x80)
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p++;
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else {
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if (codeset == wanted_set) {
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if (*p == ie)
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{ /* improved length check (Werner Cornelius) */
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if ((pend - p) < 2)
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return (NULL);
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if (*(p + 1) > (pend - (p + 2)))
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return (NULL);
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return (p);
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}
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if (*p > ie)
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return (NULL);
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}
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p++;
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l = *p++;
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p += l;
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codeset = maincodeset;
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}
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}
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return (NULL);
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}
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int
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getcallref(u_char *p)
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{
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int l, cr = 0;
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p++; /* prot discr */
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if (*p & 0xfe) /* wrong callref BRI only 1 octet*/
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return (-2);
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l = 0xf & *p++; /* callref length */
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if (!l) /* dummy CallRef */
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return (-1);
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cr = *p++;
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return (cr);
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}
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static int OrigCallRef = 0;
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int
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newcallref(void)
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{
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if (OrigCallRef == 127)
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OrigCallRef = 1;
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else
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OrigCallRef++;
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return (OrigCallRef);
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}
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void
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newl3state(struct l3_process *pc, int state)
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{
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if (pc->debug & L3_DEB_STATE)
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l3_debug(pc->st, "%s cr %d %d --> %d", __func__,
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pc->callref & 0x7F,
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pc->state, state);
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pc->state = state;
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}
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static void
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L3ExpireTimer(struct timer_list *timer)
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{
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struct L3Timer *t = from_timer(t, timer, tl);
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t->pc->st->lli.l4l3(t->pc->st, t->event, t->pc);
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}
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void
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L3InitTimer(struct l3_process *pc, struct L3Timer *t)
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{
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t->pc = pc;
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timer_setup(&t->tl, L3ExpireTimer, 0);
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}
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void
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L3DelTimer(struct L3Timer *t)
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{
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del_timer(&t->tl);
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}
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int
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L3AddTimer(struct L3Timer *t,
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int millisec, int event)
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{
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if (timer_pending(&t->tl)) {
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printk(KERN_WARNING "L3AddTimer: timer already active!\n");
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return -1;
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}
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t->event = event;
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t->tl.expires = jiffies + (millisec * HZ) / 1000;
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add_timer(&t->tl);
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return 0;
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}
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void
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StopAllL3Timer(struct l3_process *pc)
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{
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L3DelTimer(&pc->timer);
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}
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struct sk_buff *
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l3_alloc_skb(int len)
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{
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struct sk_buff *skb;
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if (!(skb = alloc_skb(len + MAX_HEADER_LEN, GFP_ATOMIC))) {
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printk(KERN_WARNING "HiSax: No skb for D-channel\n");
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return (NULL);
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}
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skb_reserve(skb, MAX_HEADER_LEN);
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return (skb);
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}
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static void
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no_l3_proto(struct PStack *st, int pr, void *arg)
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{
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struct sk_buff *skb = arg;
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HiSax_putstatus(st->l1.hardware, "L3", "no D protocol");
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if (skb) {
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dev_kfree_skb(skb);
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}
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}
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static int
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no_l3_proto_spec(struct PStack *st, isdn_ctrl *ic)
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{
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printk(KERN_WARNING "HiSax: no specific protocol handler for proto %lu\n", ic->arg & 0xFF);
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return (-1);
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}
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struct l3_process
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*getl3proc(struct PStack *st, int cr)
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{
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struct l3_process *p = st->l3.proc;
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while (p)
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if (p->callref == cr)
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return (p);
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else
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p = p->next;
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return (NULL);
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}
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struct l3_process
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*new_l3_process(struct PStack *st, int cr)
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{
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struct l3_process *p, *np;
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if (!(p = kmalloc(sizeof(struct l3_process), GFP_ATOMIC))) {
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printk(KERN_ERR "HiSax can't get memory for cr %d\n", cr);
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return (NULL);
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}
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if (!st->l3.proc)
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st->l3.proc = p;
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else {
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np = st->l3.proc;
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while (np->next)
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np = np->next;
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np->next = p;
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}
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p->next = NULL;
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p->debug = st->l3.debug;
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p->callref = cr;
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p->state = 0;
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p->chan = NULL;
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p->st = st;
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p->N303 = st->l3.N303;
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L3InitTimer(p, &p->timer);
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return (p);
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};
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void
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release_l3_process(struct l3_process *p)
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{
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struct l3_process *np, *pp = NULL;
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if (!p)
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return;
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np = p->st->l3.proc;
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while (np) {
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if (np == p) {
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StopAllL3Timer(p);
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if (pp)
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pp->next = np->next;
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else if (!(p->st->l3.proc = np->next) &&
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!test_bit(FLG_PTP, &p->st->l2.flag)) {
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if (p->debug)
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l3_debug(p->st, "release_l3_process: last process");
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if (skb_queue_empty(&p->st->l3.squeue)) {
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if (p->debug)
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l3_debug(p->st, "release_l3_process: release link");
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if (p->st->protocol != ISDN_PTYPE_NI1)
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FsmEvent(&p->st->l3.l3m, EV_RELEASE_REQ, NULL);
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else
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FsmEvent(&p->st->l3.l3m, EV_RELEASE_IND, NULL);
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} else {
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if (p->debug)
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l3_debug(p->st, "release_l3_process: not release link");
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}
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}
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kfree(p);
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return;
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}
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pp = np;
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np = np->next;
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}
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printk(KERN_ERR "HiSax internal L3 error CR(%d) not in list\n", p->callref);
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l3_debug(p->st, "HiSax internal L3 error CR(%d) not in list", p->callref);
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};
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static void
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l3ml3p(struct PStack *st, int pr)
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{
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struct l3_process *p = st->l3.proc;
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struct l3_process *np;
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while (p) {
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/* p might be kfreed under us, so we need to save where we want to go on */
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np = p->next;
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st->l3.l3ml3(st, pr, p);
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p = np;
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}
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}
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void
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setstack_l3dc(struct PStack *st, struct Channel *chanp)
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{
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char tmp[64];
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st->l3.proc = NULL;
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st->l3.global = NULL;
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skb_queue_head_init(&st->l3.squeue);
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st->l3.l3m.fsm = &l3fsm;
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st->l3.l3m.state = ST_L3_LC_REL;
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st->l3.l3m.debug = 1;
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st->l3.l3m.userdata = st;
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st->l3.l3m.userint = 0;
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st->l3.l3m.printdebug = l3m_debug;
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FsmInitTimer(&st->l3.l3m, &st->l3.l3m_timer);
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strcpy(st->l3.debug_id, "L3DC ");
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st->lli.l4l3_proto = no_l3_proto_spec;
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#ifdef CONFIG_HISAX_EURO
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if (st->protocol == ISDN_PTYPE_EURO) {
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setstack_dss1(st);
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} else
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#endif
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#ifdef CONFIG_HISAX_NI1
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if (st->protocol == ISDN_PTYPE_NI1) {
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setstack_ni1(st);
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} else
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#endif
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#ifdef CONFIG_HISAX_1TR6
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if (st->protocol == ISDN_PTYPE_1TR6) {
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setstack_1tr6(st);
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} else
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#endif
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if (st->protocol == ISDN_PTYPE_LEASED) {
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st->lli.l4l3 = no_l3_proto;
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st->l2.l2l3 = no_l3_proto;
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st->l3.l3ml3 = no_l3_proto;
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printk(KERN_INFO "HiSax: Leased line mode\n");
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} else {
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st->lli.l4l3 = no_l3_proto;
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st->l2.l2l3 = no_l3_proto;
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st->l3.l3ml3 = no_l3_proto;
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sprintf(tmp, "protocol %s not supported",
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(st->protocol == ISDN_PTYPE_1TR6) ? "1tr6" :
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(st->protocol == ISDN_PTYPE_EURO) ? "euro" :
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(st->protocol == ISDN_PTYPE_NI1) ? "ni1" :
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"unknown");
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printk(KERN_WARNING "HiSax: %s\n", tmp);
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st->protocol = -1;
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}
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}
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static void
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isdnl3_trans(struct PStack *st, int pr, void *arg) {
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st->l3.l3l2(st, pr, arg);
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}
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void
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releasestack_isdnl3(struct PStack *st)
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{
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while (st->l3.proc)
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release_l3_process(st->l3.proc);
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if (st->l3.global) {
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StopAllL3Timer(st->l3.global);
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kfree(st->l3.global);
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st->l3.global = NULL;
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}
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FsmDelTimer(&st->l3.l3m_timer, 54);
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skb_queue_purge(&st->l3.squeue);
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}
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void
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setstack_l3bc(struct PStack *st, struct Channel *chanp)
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{
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st->l3.proc = NULL;
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st->l3.global = NULL;
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skb_queue_head_init(&st->l3.squeue);
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st->l3.l3m.fsm = &l3fsm;
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st->l3.l3m.state = ST_L3_LC_REL;
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st->l3.l3m.debug = 1;
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st->l3.l3m.userdata = st;
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st->l3.l3m.userint = 0;
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st->l3.l3m.printdebug = l3m_debug;
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strcpy(st->l3.debug_id, "L3BC ");
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st->lli.l4l3 = isdnl3_trans;
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}
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#define DREL_TIMER_VALUE 40000
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static void
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lc_activate(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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FsmChangeState(fi, ST_L3_LC_ESTAB_WAIT);
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st->l3.l3l2(st, DL_ESTABLISH | REQUEST, NULL);
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}
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static void
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lc_connect(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 dequeued = 0;
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FsmChangeState(fi, ST_L3_LC_ESTAB);
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while ((skb = skb_dequeue(&st->l3.squeue))) {
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st->l3.l3l2(st, DL_DATA | REQUEST, skb);
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dequeued++;
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}
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if ((!st->l3.proc) && dequeued) {
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if (st->l3.debug)
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l3_debug(st, "lc_connect: release link");
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FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
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} else
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l3ml3p(st, DL_ESTABLISH | INDICATION);
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}
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static void
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lc_connected(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 dequeued = 0;
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FsmDelTimer(&st->l3.l3m_timer, 51);
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FsmChangeState(fi, ST_L3_LC_ESTAB);
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while ((skb = skb_dequeue(&st->l3.squeue))) {
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st->l3.l3l2(st, DL_DATA | REQUEST, skb);
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dequeued++;
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}
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if ((!st->l3.proc) && dequeued) {
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if (st->l3.debug)
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l3_debug(st, "lc_connected: release link");
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FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
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} else
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l3ml3p(st, DL_ESTABLISH | CONFIRM);
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}
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static void
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lc_start_delay(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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FsmChangeState(fi, ST_L3_LC_REL_DELAY);
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FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
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}
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static void
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lc_start_delay_check(struct FsmInst *fi, int event, void *arg)
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/* 20/09/00 - GE timer not user for NI-1 as layer 2 should stay up */
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{
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struct PStack *st = fi->userdata;
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FsmChangeState(fi, ST_L3_LC_REL_DELAY);
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/* 19/09/00 - GE timer not user for NI-1 */
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if (st->protocol != ISDN_PTYPE_NI1)
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FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
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}
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static void
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lc_release_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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if (test_bit(FLG_L2BLOCK, &st->l2.flag)) {
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if (st->l3.debug)
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l3_debug(st, "lc_release_req: l2 blocked");
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/* restart release timer */
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FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 51);
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} else {
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FsmChangeState(fi, ST_L3_LC_REL_WAIT);
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st->l3.l3l2(st, DL_RELEASE | REQUEST, NULL);
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}
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}
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static void
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lc_release_ind(struct FsmInst *fi, int event, void *arg)
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{
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struct PStack *st = fi->userdata;
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FsmDelTimer(&st->l3.l3m_timer, 52);
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FsmChangeState(fi, ST_L3_LC_REL);
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skb_queue_purge(&st->l3.squeue);
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l3ml3p(st, DL_RELEASE | INDICATION);
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}
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static void
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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);
|
|
}
|