/* 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; }