/* a connection set up is indicated by lower layer
*/
static int isdn_x25iface_connect_ind(struct concap_proto *cprot)
{
struct sk_buff * skb;
enum wan_states *state_p
= &( ( (ix25_pdata_t*) (cprot->proto_data) ) -> state);
IX25DEBUG( "isdn_x25iface_connect_ind %s \n"
, MY_DEVNAME(cprot->net_dev) );
if( *state_p == WAN_UNCONFIGURED ){
printk(KERN_WARNING
"isdn_x25iface_connect_ind while unconfigured %s\n"
, MY_DEVNAME(cprot->net_dev) );
return -1;
}
*state_p = WAN_CONNECTED;
skb = dev_alloc_skb(1);
if( skb ){
*( skb_put(skb, 1) ) = 0x01;
skb->protocol = x25_type_trans(skb, cprot->net_dev);
netif_rx(skb);
return 0;
} else {
printk(KERN_WARNING "isdn_x25iface_connect_ind: "
" out of memory -- disconnecting\n");
cprot -> dops -> disconn_req(cprot);
return -1;
}
}
/* deliver a dl_data frame received from i4l HL driver to the network layer
*/
static int isdn_x25iface_receive(struct concap_proto *cprot, struct sk_buff *skb)
{
IX25DEBUG( "isdn_x25iface_receive %s \n", MY_DEVNAME(cprot->net_dev) );
if ( ( (ix25_pdata_t*) (cprot->proto_data) )
-> state == WAN_CONNECTED ){
if( skb_push(skb, 1)){
skb -> data[0]=0x00;
skb->protocol = x25_type_trans(skb, cprot->net_dev);
netif_rx(skb);
return 0;
}
}
printk(KERN_WARNING "isdn_x25iface_receive %s: not connected, skb dropped\n", MY_DEVNAME(cprot->net_dev) );
dev_kfree_skb(skb);
return -1;
}
/* a disconnect is indicated by lower layer
*/
int isdn_x25iface_disconn_ind(struct concap_proto *cprot)
{
struct sk_buff *skb;
enum wan_states *state_p
= &( ( (ix25_pdata_t*) (cprot->proto_data) ) -> state);
IX25DEBUG( "isdn_x25iface_disconn_ind %s \n", MY_DEVNAME(cprot -> net_dev) );
if( *state_p == WAN_UNCONFIGURED ){
printk(KERN_WARNING
"isdn_x25iface_disconn_ind while unconfigured\n");
return -1;
}
if(! cprot -> net_dev) return -1;
*state_p = WAN_DISCONNECTED;
skb = dev_alloc_skb(1);
if( skb ){
*( skb_put(skb, 1) ) = 0x02;
skb -> mac.raw = skb -> data;
skb -> dev = cprot -> net_dev;
skb -> protocol = htons(ETH_P_X25);
skb -> pkt_type = PACKET_HOST;
netif_rx(skb);
return 0;
} else {
printk(KERN_WARNING "isdn_x25iface_disconn_ind:"
" out of memory\n");
return -1;
}
}
/* (re-)initialize the data structures for x25iface encapsulation
*/
static int isdn_x25iface_proto_restart(struct concap_proto *cprot,
struct net_device *ndev,
struct concap_device_ops *dops)
{
ix25_pdata_t * pda = cprot -> proto_data ;
ulong flags;
IX25DEBUG( "isdn_x25iface_proto_restart %s \n", MY_DEVNAME(ndev) );
if ( pdata_is_bad( pda ) ) return -1;
if( !( dops && dops -> data_req && dops -> connect_req
&& dops -> disconn_req ) ){
printk( KERN_WARNING "isdn_x25iface_restart: required dops"
" missing\n" );
isdn_x25iface_proto_close(cprot);
return -1;
}
spin_lock_irqsave(&cprot->lock, flags);
cprot -> net_dev = ndev;
cprot -> pops = &ix25_pops;
cprot -> dops = dops;
pda -> state = WAN_DISCONNECTED;
spin_unlock_irqrestore(&cprot->lock, flags);
return 0;
}
/* (re-)initialize the data structures for x25iface encapsulation
*/
int isdn_x25iface_proto_restart(struct concap_proto *cprot,
struct net_device *ndev,
struct concap_device_ops *dops)
{
ix25_pdata_t * pda = cprot -> proto_data ;
ulong flags;
IX25DEBUG( "isdn_x25iface_proto_restart %s \n", MY_DEVNAME(ndev) );
if ( pdata_is_bad( pda ) ) return -1;
if( !( dops && dops -> data_req && dops -> connect_req
&& dops -> disconn_req ) ){
printk( KERN_WARNING "isdn_x25iface_restart: required dops"
" missing\n" );
isdn_x25iface_proto_close(cprot);
return -1;
}
save_flags(flags);
cli(); /* avoid races with incoming events calling pops methods while
cprot members are inconsistent */
cprot -> net_dev = ndev;
cprot -> pops = &ix25_pops;
cprot -> dops = dops;
pda -> state = WAN_DISCONNECTED;
restore_flags(flags);
return 0;
}
/* close the x25iface encapsulation protocol
*/
int isdn_x25iface_proto_close(struct concap_proto *cprot){
ix25_pdata_t *tmp;
int ret = 0;
ulong flags;
if( ! cprot ){
printk( KERN_ERR "isdn_x25iface_proto_close: "
"invalid concap_proto pointer\n" );
return -1;
}
IX25DEBUG( "isdn_x25iface_proto_close %s \n", MY_DEVNAME(cprot -> net_dev) );
save_flags(flags);
cli(); /* avoid races with incoming events calling pops methods while
cprot members are inconsistent */
cprot -> dops = NULL;
cprot -> net_dev = NULL;
tmp = cprot -> proto_data;
if( pdata_is_bad( tmp ) ){
ret = -1;
} else {
tmp -> state = WAN_UNCONFIGURED;
}
restore_flags(flags);
return ret;
}
static int isdn_x25iface_xmit(struct concap_proto *cprot, struct sk_buff *skb)
{
unsigned char firstbyte = skb->data[0];
enum wan_states *state = &((ix25_pdata_t *)cprot->proto_data)->state;
int ret = 0;
IX25DEBUG("isdn_x25iface_xmit: %s first=%x state=%d\n",
MY_DEVNAME(cprot->net_dev), firstbyte, *state);
switch (firstbyte) {
case X25_IFACE_DATA:
if (*state == WAN_CONNECTED) {
skb_pull(skb, 1);
cprot->net_dev->trans_start = jiffies;
ret = (cprot->dops->data_req(cprot, skb));
if (ret) skb_push(skb, 1);
return ret;
}
illegal_state_warn(*state, firstbyte);
break;
case X25_IFACE_CONNECT:
if (*state == WAN_DISCONNECTED) {
*state = WAN_CONNECTING;
ret = cprot->dops->connect_req(cprot);
if (ret) {
isdn_x25iface_disconn_ind(cprot);
}
} else {
illegal_state_warn(*state, firstbyte);
}
break;
case X25_IFACE_DISCONNECT:
switch (*state) {
case WAN_DISCONNECTED:
printk(KERN_WARNING "isdn_x25iface_xmit: disconnect "
" requested while disconnected\n");
isdn_x25iface_disconn_ind(cprot);
break;
case WAN_CONNECTING:
case WAN_CONNECTED:
*state = WAN_DISCONNECTED;
cprot->dops->disconn_req(cprot);
break;
default:
illegal_state_warn(*state, firstbyte);
}
break;
case X25_IFACE_PARAMS:
printk(KERN_WARNING "isdn_x25iface_xmit: setting of lapb"
" options not yet supported\n");
break;
default:
printk(KERN_WARNING "isdn_x25iface_xmit: frame with illegal"
" first byte %x ignored:\n", firstbyte);
}
dev_kfree_skb(skb);
return 0;
}
/* deliver a dl_data frame received from i4l HL driver to the network layer
*/
int isdn_x25iface_receive(struct concap_proto *cprot, struct sk_buff *skb)
{
IX25DEBUG( "isdn_x25iface_receive %s \n", MY_DEVNAME(cprot->net_dev) );
if ( ( (ix25_pdata_t*) (cprot->proto_data) )
-> state == WAN_CONNECTED ){
skb -> dev = cprot -> net_dev;
skb -> protocol = htons(ETH_P_X25);
skb -> pkt_type = PACKET_HOST;
if( skb_push(skb, 1)){
skb -> data[0]=0x00;
skb -> mac.raw = skb -> data;
netif_rx(skb);
return 0;
}
}
printk(KERN_WARNING "isdn_x25iface_receive %s: not connected, skb dropped\n", MY_DEVNAME(cprot->net_dev) );
dev_kfree_skb(skb);
return -1;
}
/* close the x25iface encapsulation protocol
*/
static int isdn_x25iface_proto_close(struct concap_proto *cprot){
ix25_pdata_t *tmp;
int ret = 0;
ulong flags;
if( ! cprot ){
printk( KERN_ERR "isdn_x25iface_proto_close: "
"invalid concap_proto pointer\n" );
return -1;
}
IX25DEBUG( "isdn_x25iface_proto_close %s \n", MY_DEVNAME(cprot -> net_dev) );
spin_lock_irqsave(&cprot->lock, flags);
cprot -> dops = NULL;
cprot -> net_dev = NULL;
tmp = cprot -> proto_data;
if( pdata_is_bad( tmp ) ){
ret = -1;
} else {
tmp -> state = WAN_UNCONFIGURED;
}
spin_unlock_irqrestore(&cprot->lock, flags);
return ret;
}
/* process a frame handed over to us from linux network layer. First byte
semantics as defined in Documentation/networking/x25-iface.txt
*/
static int isdn_x25iface_xmit(struct concap_proto *cprot, struct sk_buff *skb)
{
unsigned char firstbyte = skb->data[0];
enum wan_states *state = &((ix25_pdata_t*)cprot->proto_data)->state;
int ret = 0;
IX25DEBUG( "isdn_x25iface_xmit: %s first=%x state=%d \n", MY_DEVNAME(cprot -> net_dev), firstbyte, *state );
switch ( firstbyte ){
case 0x00: /* dl_data request */
if( *state == WAN_CONNECTED ){
skb_pull(skb, 1);
cprot -> net_dev -> trans_start = jiffies;
ret = ( cprot -> dops -> data_req(cprot, skb) );
/* prepare for future retransmissions */
if( ret ) skb_push(skb,1);
return ret;
}
illegal_state_warn( *state, firstbyte );
break;
case 0x01: /* dl_connect request */
if( *state == WAN_DISCONNECTED ){
*state = WAN_CONNECTING;
ret = cprot -> dops -> connect_req(cprot);
if(ret){
/* reset state and notify upper layer about
* immidiatly failed attempts */
isdn_x25iface_disconn_ind(cprot);
}
} else {
illegal_state_warn( *state, firstbyte );
}
break;
case 0x02: /* dl_disconnect request */
switch ( *state ){
case WAN_DISCONNECTED:
/* Should not happen. However, give upper layer a
chance to recover from inconstistency but don't
trust the lower layer sending the disconn_confirm
when already disconnected */
printk(KERN_WARNING "isdn_x25iface_xmit: disconnect "
" requested while disconnected\n" );
isdn_x25iface_disconn_ind(cprot);
break; /* prevent infinite loops */
case WAN_CONNECTING:
case WAN_CONNECTED:
*state = WAN_DISCONNECTED;
cprot -> dops -> disconn_req(cprot);
break;
default:
illegal_state_warn( *state, firstbyte );
}
break;
case 0x03: /* changing lapb parameters requested */
printk(KERN_WARNING "isdn_x25iface_xmit: setting of lapb"
" options not yet supported\n");
break;
default:
printk(KERN_WARNING "isdn_x25iface_xmit: frame with illegal"
" first byte %x ignored:\n", firstbyte);
}
dev_kfree_skb(skb);
return 0;
}
