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; }
/* 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; }