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isdnl2.c
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/* $Id: isdnl2.c,v 2.30.2.4 2004/02/11 13:21:34 keil Exp $
*
* Author Karsten Keil
* based on the teles driver from Jan den Ouden
* Copyright by Karsten Keil <[email protected]>
*
* 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/gfp.h>
#include "hisax.h"
#include "isdnl2.h"
const char *l2_revision = "$Revision: 2.30.2.4 $";
static void l2m_debug(struct FsmInst *fi, char *fmt, ...);
static struct Fsm l2fsm;
enum {
ST_L2_1,
ST_L2_2,
ST_L2_3,
ST_L2_4,
ST_L2_5,
ST_L2_6,
ST_L2_7,
ST_L2_8,
};
#define L2_STATE_COUNT (ST_L2_8 + 1)
static char *strL2State[] =
{
"ST_L2_1",
"ST_L2_2",
"ST_L2_3",
"ST_L2_4",
"ST_L2_5",
"ST_L2_6",
"ST_L2_7",
"ST_L2_8",
};
enum {
EV_L2_UI,
EV_L2_SABME,
EV_L2_DISC,
EV_L2_DM,
EV_L2_UA,
EV_L2_FRMR,
EV_L2_SUPER,
EV_L2_I,
EV_L2_DL_DATA,
EV_L2_ACK_PULL,
EV_L2_DL_UNIT_DATA,
EV_L2_DL_ESTABLISH_REQ,
EV_L2_DL_RELEASE_REQ,
EV_L2_MDL_ASSIGN,
EV_L2_MDL_REMOVE,
EV_L2_MDL_ERROR,
EV_L1_DEACTIVATE,
EV_L2_T200,
EV_L2_T203,
EV_L2_SET_OWN_BUSY,
EV_L2_CLEAR_OWN_BUSY,
EV_L2_FRAME_ERROR,
};
#define L2_EVENT_COUNT (EV_L2_FRAME_ERROR + 1)
static char *strL2Event[] =
{
"EV_L2_UI",
"EV_L2_SABME",
"EV_L2_DISC",
"EV_L2_DM",
"EV_L2_UA",
"EV_L2_FRMR",
"EV_L2_SUPER",
"EV_L2_I",
"EV_L2_DL_DATA",
"EV_L2_ACK_PULL",
"EV_L2_DL_UNIT_DATA",
"EV_L2_DL_ESTABLISH_REQ",
"EV_L2_DL_RELEASE_REQ",
"EV_L2_MDL_ASSIGN",
"EV_L2_MDL_REMOVE",
"EV_L2_MDL_ERROR",
"EV_L1_DEACTIVATE",
"EV_L2_T200",
"EV_L2_T203",
"EV_L2_SET_OWN_BUSY",
"EV_L2_CLEAR_OWN_BUSY",
"EV_L2_FRAME_ERROR",
};
static int l2addrsize(struct Layer2 *l2);
static void
set_peer_busy(struct Layer2 *l2) {
test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
if (!skb_queue_empty(&l2->i_queue) ||
!skb_queue_empty(&l2->ui_queue))
test_and_set_bit(FLG_L2BLOCK, &l2->flag);
}
static void
clear_peer_busy(struct Layer2 *l2) {
if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag))
test_and_clear_bit(FLG_L2BLOCK, &l2->flag);
}
static void
InitWin(struct Layer2 *l2)
{
int i;
for (i = 0; i < MAX_WINDOW; i++)
l2->windowar[i] = NULL;
}
static int
freewin1(struct Layer2 *l2)
{
int i, cnt = 0;
for (i = 0; i < MAX_WINDOW; i++) {
if (l2->windowar[i]) {
cnt++;
dev_kfree_skb(l2->windowar[i]);
l2->windowar[i] = NULL;
}
}
return cnt;
}
static inline void
freewin(struct PStack *st)
{
freewin1(&st->l2);
}
static void
ReleaseWin(struct Layer2 *l2)
{
int cnt;
if ((cnt = freewin1(l2)))
printk(KERN_WARNING "isdl2 freed %d skbuffs in release\n", cnt);
}
static inline unsigned int
cansend(struct PStack *st)
{
unsigned int p1;
if (test_bit(FLG_MOD128, &st->l2.flag))
p1 = (st->l2.vs - st->l2.va) % 128;
else
p1 = (st->l2.vs - st->l2.va) % 8;
return ((p1 < st->l2.window) && !test_bit(FLG_PEER_BUSY, &st->l2.flag));
}
static inline void
clear_exception(struct Layer2 *l2)
{
test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
test_and_clear_bit(FLG_REJEXC, &l2->flag);
test_and_clear_bit(FLG_OWN_BUSY, &l2->flag);
clear_peer_busy(l2);
}
static inline int
l2headersize(struct Layer2 *l2, int ui)
{
return (((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) +
(test_bit(FLG_LAPD, &l2->flag) ? 2 : 1));
}
inline int
l2addrsize(struct Layer2 *l2)
{
return (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1);
}
static int
sethdraddr(struct Layer2 *l2, u_char *header, int rsp)
{
u_char *ptr = header;
int crbit = rsp;
if (test_bit(FLG_LAPD, &l2->flag)) {
*ptr++ = (l2->sap << 2) | (rsp ? 2 : 0);
*ptr++ = (l2->tei << 1) | 1;
return (2);
} else {
if (test_bit(FLG_ORIG, &l2->flag))
crbit = !crbit;
if (crbit)
*ptr++ = 1;
else
*ptr++ = 3;
return (1);
}
}
static inline void
enqueue_super(struct PStack *st,
struct sk_buff *skb)
{
if (test_bit(FLG_LAPB, &st->l2.flag))
st->l1.bcs->tx_cnt += skb->len;
st->l2.l2l1(st, PH_DATA | REQUEST, skb);
}
#define enqueue_ui(a, b) enqueue_super(a, b)
static inline int
IsUI(u_char *data)
{
return ((data[0] & 0xef) == UI);
}
static inline int
IsUA(u_char *data)
{
return ((data[0] & 0xef) == UA);
}
static inline int
IsDM(u_char *data)
{
return ((data[0] & 0xef) == DM);
}
static inline int
IsDISC(u_char *data)
{
return ((data[0] & 0xef) == DISC);
}
static inline int
IsSFrame(u_char *data, struct PStack *st)
{
register u_char d = *data;
if (!test_bit(FLG_MOD128, &st->l2.flag))
d &= 0xf;
return (((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c));
}
static inline int
IsSABME(u_char *data, struct PStack *st)
{
u_char d = data[0] & ~0x10;
return (test_bit(FLG_MOD128, &st->l2.flag) ? d == SABME : d == SABM);
}
static inline int
IsREJ(u_char *data, struct PStack *st)
{
return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == REJ : (data[0] & 0xf) == REJ);
}
static inline int
IsFRMR(u_char *data)
{
return ((data[0] & 0xef) == FRMR);
}
static inline int
IsRNR(u_char *data, struct PStack *st)
{
return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == RNR : (data[0] & 0xf) == RNR);
}
static int
iframe_error(struct PStack *st, struct sk_buff *skb)
{
int i = l2addrsize(&st->l2) + (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1);
int rsp = *skb->data & 0x2;
if (test_bit(FLG_ORIG, &st->l2.flag))
rsp = !rsp;
if (rsp)
return 'L';
if (skb->len < i)
return 'N';
if ((skb->len - i) > st->l2.maxlen)
return 'O';
return 0;
}
static int
super_error(struct PStack *st, struct sk_buff *skb)
{
if (skb->len != l2addrsize(&st->l2) +
(test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1))
return 'N';
return 0;
}
static int
unnum_error(struct PStack *st, struct sk_buff *skb, int wantrsp)
{
int rsp = (*skb->data & 0x2) >> 1;
if (test_bit(FLG_ORIG, &st->l2.flag))
rsp = !rsp;
if (rsp != wantrsp)
return 'L';
if (skb->len != l2addrsize(&st->l2) + 1)
return 'N';
return 0;
}
static int
UI_error(struct PStack *st, struct sk_buff *skb)
{
int rsp = *skb->data & 0x2;
if (test_bit(FLG_ORIG, &st->l2.flag))
rsp = !rsp;
if (rsp)
return 'L';
if (skb->len > st->l2.maxlen + l2addrsize(&st->l2) + 1)
return 'O';
return 0;
}
static int
FRMR_error(struct PStack *st, struct sk_buff *skb)
{
int headers = l2addrsize(&st->l2) + 1;
u_char *datap = skb->data + headers;
int rsp = *skb->data & 0x2;
if (test_bit(FLG_ORIG, &st->l2.flag))
rsp = !rsp;
if (!rsp)
return 'L';
if (test_bit(FLG_MOD128, &st->l2.flag)) {
if (skb->len < headers + 5)
return 'N';
else
l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x %2x %2x",
datap[0], datap[1], datap[2],
datap[3], datap[4]);
} else {
if (skb->len < headers + 3)
return 'N';
else
l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x",
datap[0], datap[1], datap[2]);
}
return 0;
}
static unsigned int
legalnr(struct PStack *st, unsigned int nr)
{
struct Layer2 *l2 = &st->l2;
if (test_bit(FLG_MOD128, &l2->flag))
return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128);
else
return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8);
}
static void
setva(struct PStack *st, unsigned int nr)
{
struct Layer2 *l2 = &st->l2;
int len;
u_long flags;
spin_lock_irqsave(&l2->lock, flags);
while (l2->va != nr) {
(l2->va)++;
if (test_bit(FLG_MOD128, &l2->flag))
l2->va %= 128;
else
l2->va %= 8;
len = l2->windowar[l2->sow]->len;
if (PACKET_NOACK == l2->windowar[l2->sow]->pkt_type)
len = -1;
dev_kfree_skb(l2->windowar[l2->sow]);
l2->windowar[l2->sow] = NULL;
l2->sow = (l2->sow + 1) % l2->window;
spin_unlock_irqrestore(&l2->lock, flags);
if (test_bit(FLG_LLI_L2WAKEUP, &st->lli.flag) && (len >= 0))
lli_writewakeup(st, len);
spin_lock_irqsave(&l2->lock, flags);
}
spin_unlock_irqrestore(&l2->lock, flags);
}
static void
send_uframe(struct PStack *st, u_char cmd, u_char cr)
{
struct sk_buff *skb;
u_char tmp[MAX_HEADER_LEN];
int i;
i = sethdraddr(&st->l2, tmp, cr);
tmp[i++] = cmd;
if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
printk(KERN_WARNING "isdl2 can't alloc sbbuff for send_uframe\n");
return;
}
skb_put_data(skb, tmp, i);
enqueue_super(st, skb);
}
static inline u_char
get_PollFlag(struct PStack *st, struct sk_buff *skb)
{
return (skb->data[l2addrsize(&(st->l2))] & 0x10);
}
static inline u_char
get_PollFlagFree(struct PStack *st, struct sk_buff *skb)
{
u_char PF;
PF = get_PollFlag(st, skb);
dev_kfree_skb(skb);
return (PF);
}
static inline void
start_t200(struct PStack *st, int i)
{
FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
}
static inline void
restart_t200(struct PStack *st, int i)
{
FsmRestartTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
}
static inline void
stop_t200(struct PStack *st, int i)
{
if (test_and_clear_bit(FLG_T200_RUN, &st->l2.flag))
FsmDelTimer(&st->l2.t200, i);
}
static inline void
st5_dl_release_l2l3(struct PStack *st)
{
int pr;
if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
pr = DL_RELEASE | CONFIRM;
else
pr = DL_RELEASE | INDICATION;
st->l2.l2l3(st, pr, NULL);
}
static inline void
lapb_dl_release_l2l3(struct PStack *st, int f)
{
if (test_bit(FLG_LAPB, &st->l2.flag))
st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
st->l2.l2l3(st, DL_RELEASE | f, NULL);
}
static void
establishlink(struct FsmInst *fi)
{
struct PStack *st = fi->userdata;
u_char cmd;
clear_exception(&st->l2);
st->l2.rc = 0;
cmd = (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM) | 0x10;
send_uframe(st, cmd, CMD);
FsmDelTimer(&st->l2.t203, 1);
restart_t200(st, 1);
test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
freewin(st);
FsmChangeState(fi, ST_L2_5);
}
static void
l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct PStack *st = fi->userdata;
if (get_PollFlagFree(st, skb))
st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'C');
else
st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'D');
}
static void
l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct PStack *st = fi->userdata;
if (get_PollFlagFree(st, skb))
st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
else {
st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
establishlink(fi);
test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
}
}
static void
l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct PStack *st = fi->userdata;
if (get_PollFlagFree(st, skb))
st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
else {
st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
}
establishlink(fi);
test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
}
static void
l2_go_st3(struct FsmInst *fi, int event, void *arg)
{
FsmChangeState(fi, ST_L2_3);
}
static void
l2_mdl_assign(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
FsmChangeState(fi, ST_L2_3);
st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
}
static void
l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_tail(&st->l2.ui_queue, skb);
FsmChangeState(fi, ST_L2_2);
st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
}
static void
l2_queue_ui(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_tail(&st->l2.ui_queue, skb);
}
static void
tx_ui(struct PStack *st)
{
struct sk_buff *skb;
u_char header[MAX_HEADER_LEN];
int i;
i = sethdraddr(&(st->l2), header, CMD);
header[i++] = UI;
while ((skb = skb_dequeue(&st->l2.ui_queue))) {
memcpy(skb_push(skb, i), header, i);
enqueue_ui(st, skb);
}
}
static void
l2_send_ui(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_tail(&st->l2.ui_queue, skb);
tx_ui(st);
}
static void
l2_got_ui(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
skb_pull(skb, l2headersize(&st->l2, 1));
st->l2.l2l3(st, DL_UNIT_DATA | INDICATION, skb);
/* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
* in states 1-3 for broadcast
*/
}
static void
l2_establish(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
establishlink(fi);
test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
}
static void
l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
skb_queue_purge(&st->l2.i_queue);
test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
}
static void
l2_l3_reestablish(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
skb_queue_purge(&st->l2.i_queue);
establishlink(fi);
test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
}
static void
l2_release(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
}
static void
l2_pend_rel(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
test_and_set_bit(FLG_PEND_REL, &st->l2.flag);
}
static void
l2_disconnect(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
skb_queue_purge(&st->l2.i_queue);
freewin(st);
FsmChangeState(fi, ST_L2_6);
st->l2.rc = 0;
send_uframe(st, DISC | 0x10, CMD);
FsmDelTimer(&st->l2.t203, 1);
restart_t200(st, 2);
}
static void
l2_start_multi(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
clear_exception(&st->l2);
st->l2.vs = 0;
st->l2.va = 0;
st->l2.vr = 0;
st->l2.sow = 0;
FsmChangeState(fi, ST_L2_7);
FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
}
static void
l2_send_UA(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
}
static void
l2_send_DM(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
send_uframe(st, DM | get_PollFlagFree(st, skb), RSP);
}
static void
l2_restart_multi(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
int est = 0, state;
state = fi->state;
send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'F');
if (st->l2.vs != st->l2.va) {
skb_queue_purge(&st->l2.i_queue);
est = 1;
}
clear_exception(&st->l2);
st->l2.vs = 0;
st->l2.va = 0;
st->l2.vr = 0;
st->l2.sow = 0;
FsmChangeState(fi, ST_L2_7);
stop_t200(st, 3);
FsmRestartTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
if (est)
st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
if ((ST_L2_7 == state) || (ST_L2_8 == state))
if (!skb_queue_empty(&st->l2.i_queue) && cansend(st))
st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
}
static void
l2_stop_multi(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
FsmChangeState(fi, ST_L2_4);
FsmDelTimer(&st->l2.t203, 3);
stop_t200(st, 4);
send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
skb_queue_purge(&st->l2.i_queue);
freewin(st);
lapb_dl_release_l2l3(st, INDICATION);
}
static void
l2_connected(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
int pr = -1;
if (!get_PollFlag(st, skb)) {
l2_mdl_error_ua(fi, event, arg);
return;
}
dev_kfree_skb(skb);
if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
l2_disconnect(fi, event, arg);
if (test_and_clear_bit(FLG_L3_INIT, &st->l2.flag)) {
pr = DL_ESTABLISH | CONFIRM;
} else if (st->l2.vs != st->l2.va) {
skb_queue_purge(&st->l2.i_queue);
pr = DL_ESTABLISH | INDICATION;
}
stop_t200(st, 5);
st->l2.vr = 0;
st->l2.vs = 0;
st->l2.va = 0;
st->l2.sow = 0;
FsmChangeState(fi, ST_L2_7);
FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 4);
if (pr != -1)
st->l2.l2l3(st, pr, NULL);
if (!skb_queue_empty(&st->l2.i_queue) && cansend(st))
st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
}
static void
l2_released(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
if (!get_PollFlag(st, skb)) {
l2_mdl_error_ua(fi, event, arg);
return;
}
dev_kfree_skb(skb);
stop_t200(st, 6);
lapb_dl_release_l2l3(st, CONFIRM);
FsmChangeState(fi, ST_L2_4);
}
static void
l2_reestablish(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
if (!get_PollFlagFree(st, skb)) {
establishlink(fi);
test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
}
}
static void
l2_st5_dm_release(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
if (get_PollFlagFree(st, skb)) {
stop_t200(st, 7);
if (!test_bit(FLG_L3_INIT, &st->l2.flag))
skb_queue_purge(&st->l2.i_queue);
if (test_bit(FLG_LAPB, &st->l2.flag))
st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
st5_dl_release_l2l3(st);
FsmChangeState(fi, ST_L2_4);
}
}
static void
l2_st6_dm_release(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
if (get_PollFlagFree(st, skb)) {
stop_t200(st, 8);
lapb_dl_release_l2l3(st, CONFIRM);
FsmChangeState(fi, ST_L2_4);
}
}
static inline void
enquiry_cr(struct PStack *st, u_char typ, u_char cr, u_char pf)
{
struct sk_buff *skb;
struct Layer2 *l2;
u_char tmp[MAX_HEADER_LEN];
int i;
l2 = &st->l2;
i = sethdraddr(l2, tmp, cr);
if (test_bit(FLG_MOD128, &l2->flag)) {
tmp[i++] = typ;
tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0);
} else
tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0);
if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
printk(KERN_WARNING "isdl2 can't alloc sbbuff for enquiry_cr\n");
return;
}
skb_put_data(skb, tmp, i);
enqueue_super(st, skb);
}
static inline void
enquiry_response(struct PStack *st)
{
if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
enquiry_cr(st, RNR, RSP, 1);
else
enquiry_cr(st, RR, RSP, 1);
test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
}
static inline void
transmit_enquiry(struct PStack *st)
{
if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
enquiry_cr(st, RNR, CMD, 1);
else
enquiry_cr(st, RR, CMD, 1);
test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
start_t200(st, 9);
}
static void
nrerrorrecovery(struct FsmInst *fi)
{
struct PStack *st = fi->userdata;
st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'J');
establishlink(fi);
test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
}
static void
invoke_retransmission(struct PStack *st, unsigned int nr)
{
struct Layer2 *l2 = &st->l2;
u_int p1;
u_long flags;
spin_lock_irqsave(&l2->lock, flags);
if (l2->vs != nr) {
while (l2->vs != nr) {
(l2->vs)--;
if (test_bit(FLG_MOD128, &l2->flag)) {
l2->vs %= 128;
p1 = (l2->vs - l2->va) % 128;
} else {
l2->vs %= 8;
p1 = (l2->vs - l2->va) % 8;
}
p1 = (p1 + l2->sow) % l2->window;
if (test_bit(FLG_LAPB, &l2->flag))
st->l1.bcs->tx_cnt += l2->windowar[p1]->len + l2headersize(l2, 0);
skb_queue_head(&l2->i_queue, l2->windowar[p1]);
l2->windowar[p1] = NULL;
}
spin_unlock_irqrestore(&l2->lock, flags);
st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
return;
}
spin_unlock_irqrestore(&l2->lock, flags);
}
static void
l2_st7_got_super(struct FsmInst *fi, int event, void *arg)
{
struct PStack *st = fi->userdata;
struct sk_buff *skb = arg;
int PollFlag, rsp, typ = RR;
unsigned int nr;
struct Layer2 *l2 = &st->l2;
rsp = *skb->data & 0x2;
if (test_bit(FLG_ORIG, &l2->flag))
rsp = !rsp;
skb_pull(skb, l2addrsize(l2));
if (IsRNR(skb->data, st)) {
set_peer_busy(l2);
typ = RNR;
} else
clear_peer_busy(l2);
if (IsREJ(skb->data, st))
typ = REJ;
if (test_bit(FLG_MOD128, &l2->flag)) {
PollFlag = (skb->data[1] & 0x1) == 0x1;
nr = skb->data[1] >> 1;
} else {
PollFlag = (skb->data[0] & 0x10);
nr = (skb->data[0] >> 5) & 0x7;
}
dev_kfree_skb(skb);
if (PollFlag) {
if (rsp)
st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'A');
else
enquiry_response(st);
}