Revision fc3501d411d34823fb9be248a95a0c44f945866f authored by Sven Wegener on 11 February 2009, 21:04:23 UTC, committed by Linus Torvalds on 11 February 2009, 22:25:35 UTC
We need to pass an unsigned long as the minimum, because it gets casted to an unsigned long in the sysctl handler. If we pass an int, we'll access four more bytes on 64bit arches, resulting in a random minimum value. [rientjes@google.com: fix type of `old_bytes'] Signed-off-by: Sven Wegener <sven.wegener@stealer.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 35887b1
tei.c
/* $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/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 allready asigned 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},
};
#define TEI_FN_COUNT (sizeof(TeiFnList)/sizeof(struct FsmNode))
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, TEI_FN_COUNT);
}
void
TeiFree(void)
{
FsmFree(&teifsm);
}
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