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layer2.c
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layer2.c
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/*
*
* Author Karsten Keil <[email protected]>
*
* Copyright 2008 by Karsten Keil <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/mISDNif.h>
#include <linux/slab.h>
#include "core.h"
#include "fsm.h"
#include "layer2.h"
static u_int *debug;
static
struct Fsm l2fsm = {NULL, 0, 0, NULL, NULL};
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_UNITDATA,
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_T200I,
EV_L2_T203I,
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_UNITDATA",
"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_T200I",
"EV_L2_T203I",
"EV_L2_SET_OWN_BUSY",
"EV_L2_CLEAR_OWN_BUSY",
"EV_L2_FRAME_ERROR",
};
static void
l2m_debug(struct FsmInst *fi, char *fmt, ...)
{
struct layer2 *l2 = fi->userdata;
struct va_format vaf;
va_list va;
if (!(*debug & DEBUG_L2_FSM))
return;
va_start(va, fmt);
vaf.fmt = fmt;
vaf.va = &va;
printk(KERN_DEBUG "%s l2 (sapi %d tei %d): %pV\n",
mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei, &vaf);
va_end(va);
}
inline u_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 u_int
l2addrsize(struct layer2 *l2)
{
return test_bit(FLG_LAPD, &l2->flag) ? 2 : 1;
}
static u_int
l2_newid(struct layer2 *l2)
{
u_int id;
id = l2->next_id++;
if (id == 0x7fff)
l2->next_id = 1;
id <<= 16;
id |= l2->tei << 8;
id |= l2->sapi;
return id;
}
static void
l2up(struct layer2 *l2, u_int prim, struct sk_buff *skb)
{
int err;
if (!l2->up)
return;
mISDN_HEAD_PRIM(skb) = prim;
mISDN_HEAD_ID(skb) = (l2->ch.nr << 16) | l2->ch.addr;
err = l2->up->send(l2->up, skb);
if (err) {
printk(KERN_WARNING "%s: dev %s err=%d\n", __func__,
mISDNDevName4ch(&l2->ch), err);
dev_kfree_skb(skb);
}
}
static void
l2up_create(struct layer2 *l2, u_int prim, int len, void *arg)
{
struct sk_buff *skb;
struct mISDNhead *hh;
int err;
if (!l2->up)
return;
skb = mI_alloc_skb(len, GFP_ATOMIC);
if (!skb)
return;
hh = mISDN_HEAD_P(skb);
hh->prim = prim;
hh->id = (l2->ch.nr << 16) | l2->ch.addr;
if (len)
memcpy(skb_put(skb, len), arg, len);
err = l2->up->send(l2->up, skb);
if (err) {
printk(KERN_WARNING "%s: dev %s err=%d\n", __func__,
mISDNDevName4ch(&l2->ch), err);
dev_kfree_skb(skb);
}
}
static int
l2down_skb(struct layer2 *l2, struct sk_buff *skb) {
int ret;
ret = l2->ch.recv(l2->ch.peer, skb);
if (ret && (*debug & DEBUG_L2_RECV))
printk(KERN_DEBUG "l2down_skb: dev %s ret(%d)\n",
mISDNDevName4ch(&l2->ch), ret);
return ret;
}
static int
l2down_raw(struct layer2 *l2, struct sk_buff *skb)
{
struct mISDNhead *hh = mISDN_HEAD_P(skb);
if (hh->prim == PH_DATA_REQ) {
if (test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) {
skb_queue_tail(&l2->down_queue, skb);
return 0;
}
l2->down_id = mISDN_HEAD_ID(skb);
}
return l2down_skb(l2, skb);
}
static int
l2down(struct layer2 *l2, u_int prim, u_int id, struct sk_buff *skb)
{
struct mISDNhead *hh = mISDN_HEAD_P(skb);
hh->prim = prim;
hh->id = id;
return l2down_raw(l2, skb);
}
static int
l2down_create(struct layer2 *l2, u_int prim, u_int id, int len, void *arg)
{
struct sk_buff *skb;
int err;
struct mISDNhead *hh;
skb = mI_alloc_skb(len, GFP_ATOMIC);
if (!skb)
return -ENOMEM;
hh = mISDN_HEAD_P(skb);
hh->prim = prim;
hh->id = id;
if (len)
memcpy(skb_put(skb, len), arg, len);
err = l2down_raw(l2, skb);
if (err)
dev_kfree_skb(skb);
return err;
}
static int
ph_data_confirm(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb) {
struct sk_buff *nskb = skb;
int ret = -EAGAIN;
if (test_bit(FLG_L1_NOTREADY, &l2->flag)) {
if (hh->id == l2->down_id) {
nskb = skb_dequeue(&l2->down_queue);
if (nskb) {
l2->down_id = mISDN_HEAD_ID(nskb);
if (l2down_skb(l2, nskb)) {
dev_kfree_skb(nskb);
l2->down_id = MISDN_ID_NONE;
}
} else
l2->down_id = MISDN_ID_NONE;
if (ret) {
dev_kfree_skb(skb);
ret = 0;
}
if (l2->down_id == MISDN_ID_NONE) {
test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL);
}
}
}
if (!test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) {
nskb = skb_dequeue(&l2->down_queue);
if (nskb) {
l2->down_id = mISDN_HEAD_ID(nskb);
if (l2down_skb(l2, nskb)) {
dev_kfree_skb(nskb);
l2->down_id = MISDN_ID_NONE;
test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
}
} else
test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
}
return ret;
}
static void
l2_timeout(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb;
struct mISDNhead *hh;
skb = mI_alloc_skb(0, GFP_ATOMIC);
if (!skb) {
printk(KERN_WARNING "%s: L2(%d,%d) nr:%x timer %s no skb\n",
mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei,
l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203");
return;
}
hh = mISDN_HEAD_P(skb);
hh->prim = event == EV_L2_T200 ? DL_TIMER200_IND : DL_TIMER203_IND;
hh->id = l2->ch.nr;
if (*debug & DEBUG_TIMER)
printk(KERN_DEBUG "%s: L2(%d,%d) nr:%x timer %s expired\n",
mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei,
l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203");
if (l2->ch.st)
l2->ch.st->own.recv(&l2->ch.st->own, skb);
}
static int
l2mgr(struct layer2 *l2, u_int prim, void *arg) {
long c = (long)arg;
printk(KERN_WARNING "l2mgr: dev %s addr:%x prim %x %c\n",
mISDNDevName4ch(&l2->ch), l2->id, prim, (char)c);
if (test_bit(FLG_LAPD, &l2->flag) &&
!test_bit(FLG_FIXED_TEI, &l2->flag)) {
switch (c) {
case 'C':
case 'D':
case 'G':
case 'H':
l2_tei(l2, prim, (u_long)arg);
break;
}
}
return 0;
}
static void
set_peer_busy(struct layer2 *l2) {
test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
if (skb_queue_len(&l2->i_queue) || skb_queue_len(&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
freewin(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 void
ReleaseWin(struct layer2 *l2)
{
int cnt = freewin(l2);
if (cnt)
printk(KERN_WARNING
"isdnl2 freed %d skbuffs in release\n", cnt);
}
inline unsigned int
cansend(struct layer2 *l2)
{
unsigned int p1;
if (test_bit(FLG_MOD128, &l2->flag))
p1 = (l2->vs - l2->va) % 128;
else
p1 = (l2->vs - l2->va) % 8;
return (p1 < l2->window) && !test_bit(FLG_PEER_BUSY, &l2->flag);
}
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 int
sethdraddr(struct layer2 *l2, u_char *header, int rsp)
{
u_char *ptr = header;
int crbit = rsp;
if (test_bit(FLG_LAPD, &l2->flag)) {
if (test_bit(FLG_LAPD_NET, &l2->flag))
crbit = !crbit;
*ptr++ = (l2->sapi << 2) | (crbit ? 2 : 0);
*ptr++ = (l2->tei << 1) | 1;
return 2;
} else {
if (test_bit(FLG_ORIG, &l2->flag))
crbit = !crbit;
if (crbit)
*ptr++ = l2->addr.B;
else
*ptr++ = l2->addr.A;
return 1;
}
}
static inline void
enqueue_super(struct layer2 *l2, struct sk_buff *skb)
{
if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb))
dev_kfree_skb(skb);
}
static inline void
enqueue_ui(struct layer2 *l2, struct sk_buff *skb)
{
if (l2->tm)
l2_tei(l2, MDL_STATUS_UI_IND, 0);
if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb))
dev_kfree_skb(skb);
}
inline int
IsUI(u_char *data)
{
return (data[0] & 0xef) == UI;
}
inline int
IsUA(u_char *data)
{
return (data[0] & 0xef) == UA;
}
inline int
IsDM(u_char *data)
{
return (data[0] & 0xef) == DM;
}
inline int
IsDISC(u_char *data)
{
return (data[0] & 0xef) == DISC;
}
inline int
IsRR(u_char *data, struct layer2 *l2)
{
if (test_bit(FLG_MOD128, &l2->flag))
return data[0] == RR;
else
return (data[0] & 0xf) == 1;
}
inline int
IsSFrame(u_char *data, struct layer2 *l2)
{
register u_char d = *data;
if (!test_bit(FLG_MOD128, &l2->flag))
d &= 0xf;
return ((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c);
}
inline int
IsSABME(u_char *data, struct layer2 *l2)
{
u_char d = data[0] & ~0x10;
return test_bit(FLG_MOD128, &l2->flag) ? d == SABME : d == SABM;
}
inline int
IsREJ(u_char *data, struct layer2 *l2)
{
return test_bit(FLG_MOD128, &l2->flag) ?
data[0] == REJ : (data[0] & 0xf) == REJ;
}
inline int
IsFRMR(u_char *data)
{
return (data[0] & 0xef) == FRMR;
}
inline int
IsRNR(u_char *data, struct layer2 *l2)
{
return test_bit(FLG_MOD128, &l2->flag) ?
data[0] == RNR : (data[0] & 0xf) == RNR;
}
static int
iframe_error(struct layer2 *l2, struct sk_buff *skb)
{
u_int i;
int rsp = *skb->data & 0x2;
i = l2addrsize(l2) + (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1);
if (test_bit(FLG_ORIG, &l2->flag))
rsp = !rsp;
if (rsp)
return 'L';
if (skb->len < i)
return 'N';
if ((skb->len - i) > l2->maxlen)
return 'O';
return 0;
}
static int
super_error(struct layer2 *l2, struct sk_buff *skb)
{
if (skb->len != l2addrsize(l2) +
(test_bit(FLG_MOD128, &l2->flag) ? 2 : 1))
return 'N';
return 0;
}
static int
unnum_error(struct layer2 *l2, struct sk_buff *skb, int wantrsp)
{
int rsp = (*skb->data & 0x2) >> 1;
if (test_bit(FLG_ORIG, &l2->flag))
rsp = !rsp;
if (rsp != wantrsp)
return 'L';
if (skb->len != l2addrsize(l2) + 1)
return 'N';
return 0;
}
static int
UI_error(struct layer2 *l2, struct sk_buff *skb)
{
int rsp = *skb->data & 0x2;
if (test_bit(FLG_ORIG, &l2->flag))
rsp = !rsp;
if (rsp)
return 'L';
if (skb->len > l2->maxlen + l2addrsize(l2) + 1)
return 'O';
return 0;
}
static int
FRMR_error(struct layer2 *l2, struct sk_buff *skb)
{
u_int headers = l2addrsize(l2) + 1;
u_char *datap = skb->data + headers;
int rsp = *skb->data & 0x2;
if (test_bit(FLG_ORIG, &l2->flag))
rsp = !rsp;
if (!rsp)
return 'L';
if (test_bit(FLG_MOD128, &l2->flag)) {
if (skb->len < headers + 5)
return 'N';
else if (*debug & DEBUG_L2)
l2m_debug(&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 if (*debug & DEBUG_L2)
l2m_debug(&l2->l2m,
"FRMR information %2x %2x %2x",
datap[0], datap[1], datap[2]);
}
return 0;
}
static unsigned int
legalnr(struct layer2 *l2, unsigned int nr)
{
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 layer2 *l2, unsigned int nr)
{
struct sk_buff *skb;
while (l2->va != nr) {
l2->va++;
if (test_bit(FLG_MOD128, &l2->flag))
l2->va %= 128;
else
l2->va %= 8;
if (l2->windowar[l2->sow]) {
skb_trim(l2->windowar[l2->sow], 0);
skb_queue_tail(&l2->tmp_queue, l2->windowar[l2->sow]);
l2->windowar[l2->sow] = NULL;
}
l2->sow = (l2->sow + 1) % l2->window;
}
skb = skb_dequeue(&l2->tmp_queue);
while (skb) {
dev_kfree_skb(skb);
skb = skb_dequeue(&l2->tmp_queue);
}
}
static void
send_uframe(struct layer2 *l2, struct sk_buff *skb, u_char cmd, u_char cr)
{
u_char tmp[MAX_L2HEADER_LEN];
int i;
i = sethdraddr(l2, tmp, cr);
tmp[i++] = cmd;
if (skb)
skb_trim(skb, 0);
else {
skb = mI_alloc_skb(i, GFP_ATOMIC);
if (!skb) {
printk(KERN_WARNING "%s: can't alloc skbuff in %s\n",
mISDNDevName4ch(&l2->ch), __func__);
return;
}
}
memcpy(skb_put(skb, i), tmp, i);
enqueue_super(l2, skb);
}
inline u_char
get_PollFlag(struct layer2 *l2, struct sk_buff *skb)
{
return skb->data[l2addrsize(l2)] & 0x10;
}
inline u_char
get_PollFlagFree(struct layer2 *l2, struct sk_buff *skb)
{
u_char PF;
PF = get_PollFlag(l2, skb);
dev_kfree_skb(skb);
return PF;
}
inline void
start_t200(struct layer2 *l2, int i)
{
mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i);
test_and_set_bit(FLG_T200_RUN, &l2->flag);
}
inline void
restart_t200(struct layer2 *l2, int i)
{
mISDN_FsmRestartTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i);
test_and_set_bit(FLG_T200_RUN, &l2->flag);
}
inline void
stop_t200(struct layer2 *l2, int i)
{
if (test_and_clear_bit(FLG_T200_RUN, &l2->flag))
mISDN_FsmDelTimer(&l2->t200, i);
}
inline void
st5_dl_release_l2l3(struct layer2 *l2)
{
int pr;
if (test_and_clear_bit(FLG_PEND_REL, &l2->flag))
pr = DL_RELEASE_CNF;
else
pr = DL_RELEASE_IND;
l2up_create(l2, pr, 0, NULL);
}
inline void
lapb_dl_release_l2l3(struct layer2 *l2, int f)
{
if (test_bit(FLG_LAPB, &l2->flag))
l2down_create(l2, PH_DEACTIVATE_REQ, l2_newid(l2), 0, NULL);
l2up_create(l2, f, 0, NULL);
}
static void
establishlink(struct FsmInst *fi)
{
struct layer2 *l2 = fi->userdata;
u_char cmd;
clear_exception(l2);
l2->rc = 0;
cmd = (test_bit(FLG_MOD128, &l2->flag) ? SABME : SABM) | 0x10;
send_uframe(l2, NULL, cmd, CMD);
mISDN_FsmDelTimer(&l2->t203, 1);
restart_t200(l2, 1);
test_and_clear_bit(FLG_PEND_REL, &l2->flag);
freewin(l2);
mISDN_FsmChangeState(fi, ST_L2_5);
}
static void
l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct layer2 *l2 = fi->userdata;
if (get_PollFlagFree(l2, skb))
l2mgr(l2, MDL_ERROR_IND, (void *) 'C');
else
l2mgr(l2, MDL_ERROR_IND, (void *) 'D');
}
static void
l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct layer2 *l2 = fi->userdata;
if (get_PollFlagFree(l2, skb))
l2mgr(l2, MDL_ERROR_IND, (void *) 'B');
else {
l2mgr(l2, MDL_ERROR_IND, (void *) 'E');
establishlink(fi);
test_and_clear_bit(FLG_L3_INIT, &l2->flag);
}
}
static void
l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct layer2 *l2 = fi->userdata;
if (get_PollFlagFree(l2, skb))
l2mgr(l2, MDL_ERROR_IND, (void *) 'B');
else
l2mgr(l2, MDL_ERROR_IND, (void *) 'E');
establishlink(fi);
test_and_clear_bit(FLG_L3_INIT, &l2->flag);
}
static void
l2_go_st3(struct FsmInst *fi, int event, void *arg)
{
dev_kfree_skb((struct sk_buff *)arg);
mISDN_FsmChangeState(fi, ST_L2_3);
}
static void
l2_mdl_assign(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
mISDN_FsmChangeState(fi, ST_L2_3);
dev_kfree_skb((struct sk_buff *)arg);
l2_tei(l2, MDL_ASSIGN_IND, 0);
}
static void
l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_tail(&l2->ui_queue, skb);
mISDN_FsmChangeState(fi, ST_L2_2);
l2_tei(l2, MDL_ASSIGN_IND, 0);
}
static void
l2_queue_ui(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_tail(&l2->ui_queue, skb);
}
static void
tx_ui(struct layer2 *l2)
{
struct sk_buff *skb;
u_char header[MAX_L2HEADER_LEN];
int i;
i = sethdraddr(l2, header, CMD);
if (test_bit(FLG_LAPD_NET, &l2->flag))
header[1] = 0xff; /* tei 127 */
header[i++] = UI;
while ((skb = skb_dequeue(&l2->ui_queue))) {
memcpy(skb_push(skb, i), header, i);
enqueue_ui(l2, skb);
}
}
static void
l2_send_ui(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_tail(&l2->ui_queue, skb);
tx_ui(l2);
}
static void
l2_got_ui(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_pull(skb, l2headersize(l2, 1));
/*
* in states 1-3 for broadcast
*/
if (l2->tm)
l2_tei(l2, MDL_STATUS_UI_IND, 0);
l2up(l2, DL_UNITDATA_IND, skb);
}
static void
l2_establish(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct layer2 *l2 = fi->userdata;
establishlink(fi);
test_and_set_bit(FLG_L3_INIT, &l2->flag);
dev_kfree_skb(skb);
}
static void
l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct layer2 *l2 = fi->userdata;
skb_queue_purge(&l2->i_queue);
test_and_set_bit(FLG_L3_INIT, &l2->flag);
test_and_clear_bit(FLG_PEND_REL, &l2->flag);
dev_kfree_skb(skb);
}
static void
l2_l3_reestablish(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct layer2 *l2 = fi->userdata;
skb_queue_purge(&l2->i_queue);
establishlink(fi);
test_and_set_bit(FLG_L3_INIT, &l2->flag);
dev_kfree_skb(skb);
}
static void
l2_release(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_trim(skb, 0);
l2up(l2, DL_RELEASE_CNF, skb);
}
static void
l2_pend_rel(struct FsmInst *fi, int event, void *arg)
{
struct sk_buff *skb = arg;
struct layer2 *l2 = fi->userdata;
test_and_set_bit(FLG_PEND_REL, &l2->flag);
dev_kfree_skb(skb);
}
static void
l2_disconnect(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_purge(&l2->i_queue);
freewin(l2);
mISDN_FsmChangeState(fi, ST_L2_6);
l2->rc = 0;
send_uframe(l2, NULL, DISC | 0x10, CMD);
mISDN_FsmDelTimer(&l2->t203, 1);
restart_t200(l2, 2);
if (skb)
dev_kfree_skb(skb);
}
static void
l2_start_multi(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
l2->vs = 0;
l2->va = 0;
l2->vr = 0;
l2->sow = 0;
clear_exception(l2);
send_uframe(l2, NULL, UA | get_PollFlag(l2, skb), RSP);
mISDN_FsmChangeState(fi, ST_L2_7);
mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3);
skb_trim(skb, 0);
l2up(l2, DL_ESTABLISH_IND, skb);
if (l2->tm)
l2_tei(l2, MDL_STATUS_UP_IND, 0);
}
static void
l2_send_UA(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP);
}
static void
l2_send_DM(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
send_uframe(l2, skb, DM | get_PollFlag(l2, skb), RSP);
}
static void
l2_restart_multi(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
int est = 0;
send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP);
l2mgr(l2, MDL_ERROR_IND, (void *) 'F');
if (l2->vs != l2->va) {
skb_queue_purge(&l2->i_queue);
est = 1;
}
clear_exception(l2);
l2->vs = 0;
l2->va = 0;
l2->vr = 0;
l2->sow = 0;
mISDN_FsmChangeState(fi, ST_L2_7);
stop_t200(l2, 3);
mISDN_FsmRestartTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3);
if (est)
l2up_create(l2, DL_ESTABLISH_IND, 0, NULL);
/* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST,
* MGR_SHORTSTATUS | INDICATION, SSTATUS_L2_ESTABLISHED,
* 0, NULL, 0);
*/
if (skb_queue_len(&l2->i_queue) && cansend(l2))
mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
}
static void
l2_stop_multi(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
mISDN_FsmChangeState(fi, ST_L2_4);
mISDN_FsmDelTimer(&l2->t203, 3);
stop_t200(l2, 4);
send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP);
skb_queue_purge(&l2->i_queue);