cregit-Linux how code gets into the kernel

Release 4.7 drivers/isdn/hisax/isdnl3.c

/* $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); }

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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; }

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static void L3ExpireTimer(struct L3Timer *t) { t->pc->st->lli.l4l3(t->pc->st, t->event, t->pc); }

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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); }

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void L3DelTimer(struct L3Timer *t) { del_timer(&t->tl); }

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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; }

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void StopAllL3Timer(struct l3_process *pc) { L3DelTimer(&pc->timer); }

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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); }

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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); } }

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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); }

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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); }

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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); }

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;
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); }

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;
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; } }

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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; } }

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static void isdnl3_trans(struct PStack *st, int pr, void *arg) { st->l3.l3l2(st, pr, arg); }

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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); }

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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; }

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#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); }

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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); }

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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); }

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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); }

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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); }

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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); } }

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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); }

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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); }

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/* *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; } }

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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)); }

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void Isdnl3Free(void) { FsmFree(&l3fsm); }

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