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linux_dsm_epyc7002/drivers/isdn/mISDN/layer2.c
Karsten Keil c96356a9ba mISDN: fix OOM condition for sending queued I-Frames 
The old code did not check the return value of skb_clone().
The extra skb_clone() is not needed at all, if using skb_realloc_headroom()
instead, which gives us a private copy with enough headroom as well.
We need to requeue the original skb if the call failed, because we cannot
inform upper layers about the data loss. Restructure the code to minimise
rollback effort if it happens.
This fix kernel bug #86091

Thanks to Insu Yun <wuninsu@gmail.com> to remind me on this issue.

Signed-off-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-10-22 07:23:19 -07:00

2268 lines
52 KiB
C
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/*
*
* Author Karsten Keil <kkeil@novell.com>
*
* Copyright 2008 by Karsten Keil <kkeil@novell.com>
*
* 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);
freewin(l2);
lapb_dl_release_l2l3(l2, DL_RELEASE_IND);
if (l2->tm)
l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
}
static void
l2_connected(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
int pr = -1;
if (!get_PollFlag(l2, skb)) {
l2_mdl_error_ua(fi, event, arg);
return;
}
dev_kfree_skb(skb);
if (test_and_clear_bit(FLG_PEND_REL, &l2->flag))
l2_disconnect(fi, event, NULL);
if (test_and_clear_bit(FLG_L3_INIT, &l2->flag)) {
pr = DL_ESTABLISH_CNF;
} else if (l2->vs != l2->va) {
skb_queue_purge(&l2->i_queue);
pr = DL_ESTABLISH_IND;
}
stop_t200(l2, 5);
l2->vr = 0;
l2->vs = 0;
l2->va = 0;
l2->sow = 0;
mISDN_FsmChangeState(fi, ST_L2_7);
mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 4);
if (pr != -1)
l2up_create(l2, pr, 0, NULL);
if (skb_queue_len(&l2->i_queue) && cansend(l2))
mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
if (l2->tm)
l2_tei(l2, MDL_STATUS_UP_IND, 0);
}
static void
l2_released(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
if (!get_PollFlag(l2, skb)) {
l2_mdl_error_ua(fi, event, arg);
return;
}
dev_kfree_skb(skb);
stop_t200(l2, 6);
lapb_dl_release_l2l3(l2, DL_RELEASE_CNF);
mISDN_FsmChangeState(fi, ST_L2_4);
if (l2->tm)
l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
}
static void
l2_reestablish(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
if (!get_PollFlagFree(l2, skb)) {
establishlink(fi);
test_and_set_bit(FLG_L3_INIT, &l2->flag);
}
}
static void
l2_st5_dm_release(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
if (get_PollFlagFree(l2, skb)) {
stop_t200(l2, 7);
if (!test_bit(FLG_L3_INIT, &l2->flag))
skb_queue_purge(&l2->i_queue);
if (test_bit(FLG_LAPB, &l2->flag))
l2down_create(l2, PH_DEACTIVATE_REQ,
l2_newid(l2), 0, NULL);
st5_dl_release_l2l3(l2);
mISDN_FsmChangeState(fi, ST_L2_4);
if (l2->tm)
l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
}
}
static void
l2_st6_dm_release(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
if (get_PollFlagFree(l2, skb)) {
stop_t200(l2, 8);
lapb_dl_release_l2l3(l2, DL_RELEASE_CNF);
mISDN_FsmChangeState(fi, ST_L2_4);
if (l2->tm)
l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
}
}
static void
enquiry_cr(struct layer2 *l2, u_char typ, u_char cr, u_char pf)
{
struct sk_buff *skb;
u_char tmp[MAX_L2HEADER_LEN];
int i;
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);
skb = mI_alloc_skb(i, GFP_ATOMIC);
if (!skb) {
printk(KERN_WARNING "%s: isdnl2 can't alloc sbbuff in %s\n",
mISDNDevName4ch(&l2->ch), __func__);
return;
}
memcpy(skb_put(skb, i), tmp, i);
enqueue_super(l2, skb);
}
inline void
enquiry_response(struct layer2 *l2)
{
if (test_bit(FLG_OWN_BUSY, &l2->flag))
enquiry_cr(l2, RNR, RSP, 1);
else
enquiry_cr(l2, RR, RSP, 1);
test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
}
inline void
transmit_enquiry(struct layer2 *l2)
{
if (test_bit(FLG_OWN_BUSY, &l2->flag))
enquiry_cr(l2, RNR, CMD, 1);
else
enquiry_cr(l2, RR, CMD, 1);
test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
start_t200(l2, 9);
}
static void
nrerrorrecovery(struct FsmInst *fi)
{
struct layer2 *l2 = fi->userdata;
l2mgr(l2, MDL_ERROR_IND, (void *) 'J');
establishlink(fi);
test_and_clear_bit(FLG_L3_INIT, &l2->flag);
}
static void
invoke_retransmission(struct layer2 *l2, unsigned int nr)
{
u_int p1;
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 (l2->windowar[p1])
skb_queue_head(&l2->i_queue, l2->windowar[p1]);
else
printk(KERN_WARNING
"%s: windowar[%d] is NULL\n",
mISDNDevName4ch(&l2->ch), p1);
l2->windowar[p1] = NULL;
}
mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL);
}
}
static void
l2_st7_got_super(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
int PollFlag, rsp, typ = RR;
unsigned int nr;
rsp = *skb->data & 0x2;
if (test_bit(FLG_ORIG, &l2->flag))
rsp = !rsp;
skb_pull(skb, l2addrsize(l2));
if (IsRNR(skb->data, l2)) {
set_peer_busy(l2);
typ = RNR;
} else
clear_peer_busy(l2);
if (IsREJ(skb->data, l2))
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)
l2mgr(l2, MDL_ERROR_IND, (void *) 'A');
else
enquiry_response(l2);
}
if (legalnr(l2, nr)) {
if (typ == REJ) {
setva(l2, nr);
invoke_retransmission(l2, nr);
stop_t200(l2, 10);
if (mISDN_FsmAddTimer(&l2->t203, l2->T203,
EV_L2_T203, NULL, 6))
l2m_debug(&l2->l2m, "Restart T203 ST7 REJ");
} else if ((nr == l2->vs) && (typ == RR)) {
setva(l2, nr);
stop_t200(l2, 11);
mISDN_FsmRestartTimer(&l2->t203, l2->T203,
EV_L2_T203, NULL, 7);
} else if ((l2->va != nr) || (typ == RNR)) {
setva(l2, nr);
if (typ != RR)
mISDN_FsmDelTimer(&l2->t203, 9);
restart_t200(l2, 12);
}
if (skb_queue_len(&l2->i_queue) && (typ == RR))
mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
} else
nrerrorrecovery(fi);
}
static void
l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
if (!test_bit(FLG_L3_INIT, &l2->flag))
skb_queue_tail(&l2->i_queue, skb);
else
dev_kfree_skb(skb);
}
static void
l2_feed_i_pull(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_tail(&l2->i_queue, skb);
mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
}
static void
l2_feed_iqueue(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_tail(&l2->i_queue, skb);
}
static void
l2_got_iframe(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
int PollFlag, i;
u_int ns, nr;
i = l2addrsize(l2);
if (test_bit(FLG_MOD128, &l2->flag)) {
PollFlag = ((skb->data[i + 1] & 0x1) == 0x1);
ns = skb->data[i] >> 1;
nr = (skb->data[i + 1] >> 1) & 0x7f;
} else {
PollFlag = (skb->data[i] & 0x10);
ns = (skb->data[i] >> 1) & 0x7;
nr = (skb->data[i] >> 5) & 0x7;
}
if (test_bit(FLG_OWN_BUSY, &l2->flag)) {
dev_kfree_skb(skb);
if (PollFlag)
enquiry_response(l2);
} else {
if (l2->vr == ns) {
l2->vr++;
if (test_bit(FLG_MOD128, &l2->flag))
l2->vr %= 128;
else
l2->vr %= 8;
test_and_clear_bit(FLG_REJEXC, &l2->flag);
if (PollFlag)
enquiry_response(l2);
else
test_and_set_bit(FLG_ACK_PEND, &l2->flag);
skb_pull(skb, l2headersize(l2, 0));
l2up(l2, DL_DATA_IND, skb);
} else {
/* n(s)!=v(r) */
dev_kfree_skb(skb);
if (test_and_set_bit(FLG_REJEXC, &l2->flag)) {
if (PollFlag)
enquiry_response(l2);
} else {
enquiry_cr(l2, REJ, RSP, PollFlag);
test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
}
}
}
if (legalnr(l2, nr)) {
if (!test_bit(FLG_PEER_BUSY, &l2->flag) &&
(fi->state == ST_L2_7)) {
if (nr == l2->vs) {
stop_t200(l2, 13);
mISDN_FsmRestartTimer(&l2->t203, l2->T203,
EV_L2_T203, NULL, 7);
} else if (nr != l2->va)
restart_t200(l2, 14);
}
setva(l2, nr);
} else {
nrerrorrecovery(fi);
return;
}
if (skb_queue_len(&l2->i_queue) && (fi->state == ST_L2_7))
mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
if (test_and_clear_bit(FLG_ACK_PEND, &l2->flag))
enquiry_cr(l2, RR, RSP, 0);
}
static void
l2_got_tei(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
u_int info;
l2->tei = (signed char)(long)arg;
set_channel_address(&l2->ch, l2->sapi, l2->tei);
info = DL_INFO_L2_CONNECT;
l2up_create(l2, DL_INFORMATION_IND, sizeof(info), &info);
if (fi->state == ST_L2_3) {
establishlink(fi);
test_and_set_bit(FLG_L3_INIT, &l2->flag);
} else
mISDN_FsmChangeState(fi, ST_L2_4);
if (skb_queue_len(&l2->ui_queue))
tx_ui(l2);
}
static void
l2_st5_tout_200(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
if (test_bit(FLG_LAPD, &l2->flag) &&
test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
} else if (l2->rc == l2->N200) {
mISDN_FsmChangeState(fi, ST_L2_4);
test_and_clear_bit(FLG_T200_RUN, &l2->flag);
skb_queue_purge(&l2->i_queue);
l2mgr(l2, MDL_ERROR_IND, (void *) 'G');
if (test_bit(FLG_LAPB, &l2->flag))
l2down_create(l2, PH_DEACTIVATE_REQ,
l2_newid(l2), 0, NULL);
st5_dl_release_l2l3(l2);
if (l2->tm)
l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
} else {
l2->rc++;
mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
send_uframe(l2, NULL, (test_bit(FLG_MOD128, &l2->flag) ?
SABME : SABM) | 0x10, CMD);
}
}
static void
l2_st6_tout_200(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
if (test_bit(FLG_LAPD, &l2->flag) &&
test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
} else if (l2->rc == l2->N200) {
mISDN_FsmChangeState(fi, ST_L2_4);
test_and_clear_bit(FLG_T200_RUN, &l2->flag);
l2mgr(l2, MDL_ERROR_IND, (void *) 'H');
lapb_dl_release_l2l3(l2, DL_RELEASE_CNF);
if (l2->tm)
l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
} else {
l2->rc++;
mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200,
NULL, 9);
send_uframe(l2, NULL, DISC | 0x10, CMD);
}
}
static void
l2_st7_tout_200(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
if (test_bit(FLG_LAPD, &l2->flag) &&
test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
return;
}
test_and_clear_bit(FLG_T200_RUN, &l2->flag);
l2->rc = 0;
mISDN_FsmChangeState(fi, ST_L2_8);
transmit_enquiry(l2);
l2->rc++;
}
static void
l2_st8_tout_200(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
if (test_bit(FLG_LAPD, &l2->flag) &&
test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
return;
}
test_and_clear_bit(FLG_T200_RUN, &l2->flag);
if (l2->rc == l2->N200) {
l2mgr(l2, MDL_ERROR_IND, (void *) 'I');
establishlink(fi);
test_and_clear_bit(FLG_L3_INIT, &l2->flag);
} else {
transmit_enquiry(l2);
l2->rc++;
}
}
static void
l2_st7_tout_203(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
if (test_bit(FLG_LAPD, &l2->flag) &&
test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 9);
return;
}
mISDN_FsmChangeState(fi, ST_L2_8);
transmit_enquiry(l2);
l2->rc = 0;
}
static void
l2_pull_iqueue(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb, *nskb;
u_char header[MAX_L2HEADER_LEN];
u_int i, p1;
if (!cansend(l2))
return;
skb = skb_dequeue(&l2->i_queue);
if (!skb)
return;
i = sethdraddr(l2, header, CMD);
if (test_bit(FLG_MOD128, &l2->flag)) {
header[i++] = l2->vs << 1;
header[i++] = l2->vr << 1;
} else
header[i++] = (l2->vr << 5) | (l2->vs << 1);
nskb = skb_realloc_headroom(skb, i);
if (!nskb) {
printk(KERN_WARNING "%s: no headroom(%d) copy for IFrame\n",
mISDNDevName4ch(&l2->ch), i);
skb_queue_head(&l2->i_queue, skb);
return;
}
if (test_bit(FLG_MOD128, &l2->flag)) {
p1 = (l2->vs - l2->va) % 128;
l2->vs = (l2->vs + 1) % 128;
} else {
p1 = (l2->vs - l2->va) % 8;
l2->vs = (l2->vs + 1) % 8;
}
p1 = (p1 + l2->sow) % l2->window;
if (l2->windowar[p1]) {
printk(KERN_WARNING "%s: l2 try overwrite ack queue entry %d\n",
mISDNDevName4ch(&l2->ch), p1);
dev_kfree_skb(l2->windowar[p1]);
}
l2->windowar[p1] = skb;
memcpy(skb_push(nskb, i), header, i);
l2down(l2, PH_DATA_REQ, l2_newid(l2), nskb);
test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
if (!test_and_set_bit(FLG_T200_RUN, &l2->flag)) {
mISDN_FsmDelTimer(&l2->t203, 13);
mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 11);
}
}
static void
l2_st8_got_super(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
int PollFlag, rsp, rnr = 0;
unsigned int nr;
rsp = *skb->data & 0x2;
if (test_bit(FLG_ORIG, &l2->flag))
rsp = !rsp;
skb_pull(skb, l2addrsize(l2));
if (IsRNR(skb->data, l2)) {
set_peer_busy(l2);
rnr = 1;
} else
clear_peer_busy(l2);
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 (rsp && PollFlag) {
if (legalnr(l2, nr)) {
if (rnr) {
restart_t200(l2, 15);
} else {
stop_t200(l2, 16);
mISDN_FsmAddTimer(&l2->t203, l2->T203,
EV_L2_T203, NULL, 5);
setva(l2, nr);
}
invoke_retransmission(l2, nr);
mISDN_FsmChangeState(fi, ST_L2_7);
if (skb_queue_len(&l2->i_queue) && cansend(l2))
mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
} else
nrerrorrecovery(fi);
} else {
if (!rsp && PollFlag)
enquiry_response(l2);
if (legalnr(l2, nr))
setva(l2, nr);
else
nrerrorrecovery(fi);
}
}
static void
l2_got_FRMR(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_pull(skb, l2addrsize(l2) + 1);
if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) || /* I or S */
(IsUA(skb->data) && (fi->state == ST_L2_7))) {
l2mgr(l2, MDL_ERROR_IND, (void *) 'K');
establishlink(fi);
test_and_clear_bit(FLG_L3_INIT, &l2->flag);
}
dev_kfree_skb(skb);
}
static void
l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
skb_queue_purge(&l2->ui_queue);
l2->tei = GROUP_TEI;
mISDN_FsmChangeState(fi, ST_L2_1);
}
static void
l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
skb_queue_purge(&l2->ui_queue);
l2->tei = GROUP_TEI;
l2up_create(l2, DL_RELEASE_IND, 0, NULL);
mISDN_FsmChangeState(fi, ST_L2_1);
}
static void
l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
skb_queue_purge(&l2->i_queue);
skb_queue_purge(&l2->ui_queue);
freewin(l2);
l2->tei = GROUP_TEI;
stop_t200(l2, 17);
st5_dl_release_l2l3(l2);
mISDN_FsmChangeState(fi, ST_L2_1);
}
static void
l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
skb_queue_purge(&l2->ui_queue);
l2->tei = GROUP_TEI;
stop_t200(l2, 18);
l2up_create(l2, DL_RELEASE_IND, 0, NULL);
mISDN_FsmChangeState(fi, ST_L2_1);
}
static void
l2_tei_remove(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
skb_queue_purge(&l2->i_queue);
skb_queue_purge(&l2->ui_queue);
freewin(l2);
l2->tei = GROUP_TEI;
stop_t200(l2, 17);
mISDN_FsmDelTimer(&l2->t203, 19);
l2up_create(l2, DL_RELEASE_IND, 0, NULL);
/* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST,
* MGR_SHORTSTATUS_IND, SSTATUS_L2_RELEASED,
* 0, NULL, 0);
*/
mISDN_FsmChangeState(fi, ST_L2_1);
}
static void
l2_st14_persistent_da(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_purge(&l2->i_queue);
skb_queue_purge(&l2->ui_queue);
if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag))
l2up(l2, DL_RELEASE_IND, skb);
else
dev_kfree_skb(skb);
}
static void
l2_st5_persistent_da(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_purge(&l2->i_queue);
skb_queue_purge(&l2->ui_queue);
freewin(l2);
stop_t200(l2, 19);
st5_dl_release_l2l3(l2);
mISDN_FsmChangeState(fi, ST_L2_4);
if (l2->tm)
l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
dev_kfree_skb(skb);
}
static void
l2_st6_persistent_da(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_purge(&l2->ui_queue);
stop_t200(l2, 20);
l2up(l2, DL_RELEASE_CNF, skb);
mISDN_FsmChangeState(fi, ST_L2_4);
if (l2->tm)
l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
}
static void
l2_persistent_da(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
skb_queue_purge(&l2->i_queue);
skb_queue_purge(&l2->ui_queue);
freewin(l2);
stop_t200(l2, 19);
mISDN_FsmDelTimer(&l2->t203, 19);
l2up(l2, DL_RELEASE_IND, skb);
mISDN_FsmChangeState(fi, ST_L2_4);
if (l2->tm)
l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
}
static void
l2_set_own_busy(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
if (!test_and_set_bit(FLG_OWN_BUSY, &l2->flag)) {
enquiry_cr(l2, RNR, RSP, 0);
test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
}
if (skb)
dev_kfree_skb(skb);
}
static void
l2_clear_own_busy(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
struct sk_buff *skb = arg;
if (!test_and_clear_bit(FLG_OWN_BUSY, &l2->flag)) {
enquiry_cr(l2, RR, RSP, 0);
test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
}
if (skb)
dev_kfree_skb(skb);
}
static void
l2_frame_error(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
l2mgr(l2, MDL_ERROR_IND, arg);
}
static void
l2_frame_error_reest(struct FsmInst *fi, int event, void *arg)
{
struct layer2 *l2 = fi->userdata;
l2mgr(l2, MDL_ERROR_IND, arg);
establishlink(fi);
test_and_clear_bit(FLG_L3_INIT, &l2->flag);
}
static struct FsmNode L2FnList[] =
{
{ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign},
{ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3},
{ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish},
{ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3},
{ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
{ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
{ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release},
{ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel},
{ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect},
{ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect},
{ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest},
{ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull},
{ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue},
{ST_L2_1, EV_L2_DL_UNITDATA, l2_queue_ui_assign},
{ST_L2_2, EV_L2_DL_UNITDATA, l2_queue_ui},
{ST_L2_3, EV_L2_DL_UNITDATA, l2_queue_ui},
{ST_L2_4, EV_L2_DL_UNITDATA, l2_send_ui},
{ST_L2_5, EV_L2_DL_UNITDATA, l2_send_ui},
{ST_L2_6, EV_L2_DL_UNITDATA, l2_send_ui},
{ST_L2_7, EV_L2_DL_UNITDATA, l2_send_ui},
{ST_L2_8, EV_L2_DL_UNITDATA, l2_send_ui},
{ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei},
{ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei},
{ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei},
{ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove},
{ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove},
{ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove},
{ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove},
{ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove},
{ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove},
{ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove},
{ST_L2_4, EV_L2_SABME, l2_start_multi},
{ST_L2_5, EV_L2_SABME, l2_send_UA},
{ST_L2_6, EV_L2_SABME, l2_send_DM},
{ST_L2_7, EV_L2_SABME, l2_restart_multi},
{ST_L2_8, EV_L2_SABME, l2_restart_multi},
{ST_L2_4, EV_L2_DISC, l2_send_DM},
{ST_L2_5, EV_L2_DISC, l2_send_DM},
{ST_L2_6, EV_L2_DISC, l2_send_UA},
{ST_L2_7, EV_L2_DISC, l2_stop_multi},
{ST_L2_8, EV_L2_DISC, l2_stop_multi},
{ST_L2_4, EV_L2_UA, l2_mdl_error_ua},
{ST_L2_5, EV_L2_UA, l2_connected},
{ST_L2_6, EV_L2_UA, l2_released},
{ST_L2_7, EV_L2_UA, l2_mdl_error_ua},
{ST_L2_8, EV_L2_UA, l2_mdl_error_ua},
{ST_L2_4, EV_L2_DM, l2_reestablish},
{ST_L2_5, EV_L2_DM, l2_st5_dm_release},
{ST_L2_6, EV_L2_DM, l2_st6_dm_release},
{ST_L2_7, EV_L2_DM, l2_mdl_error_dm},
{ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm},
{ST_L2_1, EV_L2_UI, l2_got_ui},
{ST_L2_2, EV_L2_UI, l2_got_ui},
{ST_L2_3, EV_L2_UI, l2_got_ui},
{ST_L2_4, EV_L2_UI, l2_got_ui},
{ST_L2_5, EV_L2_UI, l2_got_ui},
{ST_L2_6, EV_L2_UI, l2_got_ui},
{ST_L2_7, EV_L2_UI, l2_got_ui},
{ST_L2_8, EV_L2_UI, l2_got_ui},
{ST_L2_7, EV_L2_FRMR, l2_got_FRMR},
{ST_L2_8, EV_L2_FRMR, l2_got_FRMR},
{ST_L2_7, EV_L2_SUPER, l2_st7_got_super},
{ST_L2_8, EV_L2_SUPER, l2_st8_got_super},
{ST_L2_7, EV_L2_I, l2_got_iframe},
{ST_L2_8, EV_L2_I, l2_got_iframe},
{ST_L2_5, EV_L2_T200, l2_timeout},
{ST_L2_6, EV_L2_T200, l2_timeout},
{ST_L2_7, EV_L2_T200, l2_timeout},
{ST_L2_8, EV_L2_T200, l2_timeout},
{ST_L2_7, EV_L2_T203, l2_timeout},
{ST_L2_5, EV_L2_T200I, l2_st5_tout_200},
{ST_L2_6, EV_L2_T200I, l2_st6_tout_200},
{ST_L2_7, EV_L2_T200I, l2_st7_tout_200},
{ST_L2_8, EV_L2_T200I, l2_st8_tout_200},
{ST_L2_7, EV_L2_T203I, l2_st7_tout_203},
{ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
{ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
{ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
{ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
{ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
{ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error},
{ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error},
{ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error},
{ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest},
{ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest},
{ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistent_da},
{ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove},
{ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove},
{ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistent_da},
{ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistent_da},
{ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistent_da},
{ST_L2_7, EV_L1_DEACTIVATE, l2_persistent_da},
{ST_L2_8, EV_L1_DEACTIVATE, l2_persistent_da},
};
static int
ph_data_indication(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb)
{
u_char *datap = skb->data;
int ret = -EINVAL;
int psapi, ptei;
u_int l;
int c = 0;
l = l2addrsize(l2);
if (skb->len <= l) {
mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *) 'N');
return ret;
}
if (test_bit(FLG_LAPD, &l2->flag)) { /* Maybe not needed */
psapi = *datap++;
ptei = *datap++;
if ((psapi & 1) || !(ptei & 1)) {
printk(KERN_WARNING
"%s l2 D-channel frame wrong EA0/EA1\n",
mISDNDevName4ch(&l2->ch));
return ret;
}
psapi >>= 2;
ptei >>= 1;
if (psapi != l2->sapi) {
/* not our business */
if (*debug & DEBUG_L2)
printk(KERN_DEBUG "%s: sapi %d/%d mismatch\n",
mISDNDevName4ch(&l2->ch), psapi,
l2->sapi);
dev_kfree_skb(skb);
return 0;
}
if ((ptei != l2->tei) && (ptei != GROUP_TEI)) {
/* not our business */
if (*debug & DEBUG_L2)
printk(KERN_DEBUG "%s: tei %d/%d mismatch\n",
mISDNDevName4ch(&l2->ch), ptei, l2->tei);
dev_kfree_skb(skb);
return 0;
}
} else
datap += l;
if (!(*datap & 1)) { /* I-Frame */
c = iframe_error(l2, skb);
if (!c)
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_I, skb);
} else if (IsSFrame(datap, l2)) { /* S-Frame */
c = super_error(l2, skb);
if (!c)
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SUPER, skb);
} else if (IsUI(datap)) {
c = UI_error(l2, skb);
if (!c)
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UI, skb);
} else if (IsSABME(datap, l2)) {
c = unnum_error(l2, skb, CMD);
if (!c)
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SABME, skb);
} else if (IsUA(datap)) {
c = unnum_error(l2, skb, RSP);
if (!c)
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UA, skb);
} else if (IsDISC(datap)) {
c = unnum_error(l2, skb, CMD);
if (!c)
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DISC, skb);
} else if (IsDM(datap)) {
c = unnum_error(l2, skb, RSP);
if (!c)
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DM, skb);
} else if (IsFRMR(datap)) {
c = FRMR_error(l2, skb);
if (!c)
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_FRMR, skb);
} else
c = 'L';
if (c) {
printk(KERN_WARNING "%s:l2 D-channel frame error %c\n",
mISDNDevName4ch(&l2->ch), c);
mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *)(long)c);
}
return ret;
}
static int
l2_send(struct mISDNchannel *ch, struct sk_buff *skb)
{
struct layer2 *l2 = container_of(ch, struct layer2, ch);
struct mISDNhead *hh = mISDN_HEAD_P(skb);
int ret = -EINVAL;
if (*debug & DEBUG_L2_RECV)
printk(KERN_DEBUG "%s: %s prim(%x) id(%x) sapi(%d) tei(%d)\n",
__func__, mISDNDevName4ch(&l2->ch), hh->prim, hh->id,
l2->sapi, l2->tei);
if (hh->prim == DL_INTERN_MSG) {
struct mISDNhead *chh = hh + 1; /* saved copy */
*hh = *chh;
if (*debug & DEBUG_L2_RECV)
printk(KERN_DEBUG "%s: prim(%x) id(%x) internal msg\n",
mISDNDevName4ch(&l2->ch), hh->prim, hh->id);
}
switch (hh->prim) {
case PH_DATA_IND:
ret = ph_data_indication(l2, hh, skb);
break;
case PH_DATA_CNF:
ret = ph_data_confirm(l2, hh, skb);
break;
case PH_ACTIVATE_IND:
test_and_set_bit(FLG_L1_ACTIV, &l2->flag);
l2up_create(l2, MPH_ACTIVATE_IND, 0, NULL);
if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag))
ret = mISDN_FsmEvent(&l2->l2m,
EV_L2_DL_ESTABLISH_REQ, skb);
break;
case PH_DEACTIVATE_IND:
test_and_clear_bit(FLG_L1_ACTIV, &l2->flag);
l2up_create(l2, MPH_DEACTIVATE_IND, 0, NULL);
ret = mISDN_FsmEvent(&l2->l2m, EV_L1_DEACTIVATE, skb);
break;
case MPH_INFORMATION_IND:
if (!l2->up)
break;
ret = l2->up->send(l2->up, skb);
break;
case DL_DATA_REQ:
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_DATA, skb);
break;
case DL_UNITDATA_REQ:
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_UNITDATA, skb);
break;
case DL_ESTABLISH_REQ:
if (test_bit(FLG_LAPB, &l2->flag))
test_and_set_bit(FLG_ORIG, &l2->flag);
if (test_bit(FLG_L1_ACTIV, &l2->flag)) {
if (test_bit(FLG_LAPD, &l2->flag) ||
test_bit(FLG_ORIG, &l2->flag))
ret = mISDN_FsmEvent(&l2->l2m,
EV_L2_DL_ESTABLISH_REQ, skb);
} else {
if (test_bit(FLG_LAPD, &l2->flag) ||
test_bit(FLG_ORIG, &l2->flag)) {
test_and_set_bit(FLG_ESTAB_PEND,
&l2->flag);
}
ret = l2down(l2, PH_ACTIVATE_REQ, l2_newid(l2),
skb);
}
break;
case DL_RELEASE_REQ:
if (test_bit(FLG_LAPB, &l2->flag))
l2down_create(l2, PH_DEACTIVATE_REQ,
l2_newid(l2), 0, NULL);
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_RELEASE_REQ,
skb);
break;
case DL_TIMER200_IND:
mISDN_FsmEvent(&l2->l2m, EV_L2_T200I, NULL);
break;
case DL_TIMER203_IND:
mISDN_FsmEvent(&l2->l2m, EV_L2_T203I, NULL);
break;
default:
if (*debug & DEBUG_L2)
l2m_debug(&l2->l2m, "l2 unknown pr %04x",
hh->prim);
}
if (ret) {
dev_kfree_skb(skb);
ret = 0;
}
return ret;
}
int
tei_l2(struct layer2 *l2, u_int cmd, u_long arg)
{
int ret = -EINVAL;
if (*debug & DEBUG_L2_TEI)
printk(KERN_DEBUG "%s: cmd(%x) in %s\n",
mISDNDevName4ch(&l2->ch), cmd, __func__);
switch (cmd) {
case (MDL_ASSIGN_REQ):
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ASSIGN, (void *)arg);
break;
case (MDL_REMOVE_REQ):
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_REMOVE, NULL);
break;
case (MDL_ERROR_IND):
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL);
break;
case (MDL_ERROR_RSP):
/* ETS 300-125 5.3.2.1 Test: TC13010 */
printk(KERN_NOTICE "%s: MDL_ERROR|REQ (tei_l2)\n",
mISDNDevName4ch(&l2->ch));
ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL);
break;
}
return ret;
}
static void
release_l2(struct layer2 *l2)
{
mISDN_FsmDelTimer(&l2->t200, 21);
mISDN_FsmDelTimer(&l2->t203, 16);
skb_queue_purge(&l2->i_queue);
skb_queue_purge(&l2->ui_queue);
skb_queue_purge(&l2->down_queue);
ReleaseWin(l2);
if (test_bit(FLG_LAPD, &l2->flag)) {
TEIrelease(l2);
if (l2->ch.st)
l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D,
CLOSE_CHANNEL, NULL);
}
kfree(l2);
}
static int
l2_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
{
struct layer2 *l2 = container_of(ch, struct layer2, ch);
u_int info;
if (*debug & DEBUG_L2_CTRL)
printk(KERN_DEBUG "%s: %s cmd(%x)\n",
mISDNDevName4ch(ch), __func__, cmd);
switch (cmd) {
case OPEN_CHANNEL:
if (test_bit(FLG_LAPD, &l2->flag)) {
set_channel_address(&l2->ch, l2->sapi, l2->tei);
info = DL_INFO_L2_CONNECT;
l2up_create(l2, DL_INFORMATION_IND,
sizeof(info), &info);
}
break;
case CLOSE_CHANNEL:
if (l2->ch.peer)
l2->ch.peer->ctrl(l2->ch.peer, CLOSE_CHANNEL, NULL);
release_l2(l2);
break;
}
return 0;
}
struct layer2 *
create_l2(struct mISDNchannel *ch, u_int protocol, u_long options, int tei,
int sapi)
{
struct layer2 *l2;
struct channel_req rq;
l2 = kzalloc(sizeof(struct layer2), GFP_KERNEL);
if (!l2) {
printk(KERN_ERR "kzalloc layer2 failed\n");
return NULL;
}
l2->next_id = 1;
l2->down_id = MISDN_ID_NONE;
l2->up = ch;
l2->ch.st = ch->st;
l2->ch.send = l2_send;
l2->ch.ctrl = l2_ctrl;
switch (protocol) {
case ISDN_P_LAPD_NT:
test_and_set_bit(FLG_LAPD, &l2->flag);
test_and_set_bit(FLG_LAPD_NET, &l2->flag);
test_and_set_bit(FLG_MOD128, &l2->flag);
l2->sapi = sapi;
l2->maxlen = MAX_DFRAME_LEN;
if (test_bit(OPTION_L2_PMX, &options))
l2->window = 7;
else
l2->window = 1;
if (test_bit(OPTION_L2_PTP, &options))
test_and_set_bit(FLG_PTP, &l2->flag);
if (test_bit(OPTION_L2_FIXEDTEI, &options))
test_and_set_bit(FLG_FIXED_TEI, &l2->flag);
l2->tei = tei;
l2->T200 = 1000;
l2->N200 = 3;
l2->T203 = 10000;
if (test_bit(OPTION_L2_PMX, &options))
rq.protocol = ISDN_P_NT_E1;
else
rq.protocol = ISDN_P_NT_S0;
rq.adr.channel = 0;
l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq);
break;
case ISDN_P_LAPD_TE:
test_and_set_bit(FLG_LAPD, &l2->flag);
test_and_set_bit(FLG_MOD128, &l2->flag);
test_and_set_bit(FLG_ORIG, &l2->flag);
l2->sapi = sapi;
l2->maxlen = MAX_DFRAME_LEN;
if (test_bit(OPTION_L2_PMX, &options))
l2->window = 7;
else
l2->window = 1;
if (test_bit(OPTION_L2_PTP, &options))
test_and_set_bit(FLG_PTP, &l2->flag);
if (test_bit(OPTION_L2_FIXEDTEI, &options))
test_and_set_bit(FLG_FIXED_TEI, &l2->flag);
l2->tei = tei;
l2->T200 = 1000;
l2->N200 = 3;
l2->T203 = 10000;
if (test_bit(OPTION_L2_PMX, &options))
rq.protocol = ISDN_P_TE_E1;
else
rq.protocol = ISDN_P_TE_S0;
rq.adr.channel = 0;
l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq);
break;
case ISDN_P_B_X75SLP:
test_and_set_bit(FLG_LAPB, &l2->flag);
l2->window = 7;
l2->maxlen = MAX_DATA_SIZE;
l2->T200 = 1000;
l2->N200 = 4;
l2->T203 = 5000;
l2->addr.A = 3;
l2->addr.B = 1;
break;
default:
printk(KERN_ERR "layer2 create failed prt %x\n",
protocol);
kfree(l2);
return NULL;
}
skb_queue_head_init(&l2->i_queue);
skb_queue_head_init(&l2->ui_queue);
skb_queue_head_init(&l2->down_queue);
skb_queue_head_init(&l2->tmp_queue);
InitWin(l2);
l2->l2m.fsm = &l2fsm;
if (test_bit(FLG_LAPB, &l2->flag) ||
test_bit(FLG_FIXED_TEI, &l2->flag) ||
test_bit(FLG_LAPD_NET, &l2->flag))
l2->l2m.state = ST_L2_4;
else
l2->l2m.state = ST_L2_1;
l2->l2m.debug = *debug;
l2->l2m.userdata = l2;
l2->l2m.userint = 0;
l2->l2m.printdebug = l2m_debug;
mISDN_FsmInitTimer(&l2->l2m, &l2->t200);
mISDN_FsmInitTimer(&l2->l2m, &l2->t203);
return l2;
}
static int
x75create(struct channel_req *crq)
{
struct layer2 *l2;
if (crq->protocol != ISDN_P_B_X75SLP)
return -EPROTONOSUPPORT;
l2 = create_l2(crq->ch, crq->protocol, 0, 0, 0);
if (!l2)
return -ENOMEM;
crq->ch = &l2->ch;
crq->protocol = ISDN_P_B_HDLC;
return 0;
}
static struct Bprotocol X75SLP = {
.Bprotocols = (1 << (ISDN_P_B_X75SLP & ISDN_P_B_MASK)),
.name = "X75SLP",
.create = x75create
};
int
Isdnl2_Init(u_int *deb)
{
debug = deb;
mISDN_register_Bprotocol(&X75SLP);
l2fsm.state_count = L2_STATE_COUNT;
l2fsm.event_count = L2_EVENT_COUNT;
l2fsm.strEvent = strL2Event;
l2fsm.strState = strL2State;
mISDN_FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList));
TEIInit(deb);
return 0;
}
void
Isdnl2_cleanup(void)
{
mISDN_unregister_Bprotocol(&X75SLP);
TEIFree();
mISDN_FsmFree(&l2fsm);
}
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