/* transport.h: Rx transport management * * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _LINUX_RXRPC_TRANSPORT_H #define _LINUX_RXRPC_TRANSPORT_H #include <rxrpc/types.h> #include <rxrpc/krxiod.h> #include <rxrpc/rxrpc.h> #include <linux/skbuff.h> #include <linux/rwsem.h> typedef int (*rxrpc_newcall_fnx_t)(struct rxrpc_call *call); extern wait_queue_head_t rxrpc_krxiod_wq; /*****************************************************************************/ /* * Rx operation specification * - tables of these must be sorted by op ID so that they can be binary-chop searched */ struct rxrpc_operation { unsigned id; /* operation ID */ size_t asize; /* minimum size of argument block */ const char *name; /* name of operation */ void *user; /* initial user data */ }; /*****************************************************************************/ /* * Rx transport service record */ struct rxrpc_service { struct list_head link; /* link in services list on transport */ struct module *owner; /* owner module */ rxrpc_newcall_fnx_t new_call; /* new call handler function */ const char *name; /* name of service */ unsigned short service_id; /* Rx service ID */ rxrpc_call_attn_func_t attn_func; /* call requires attention callback */ rxrpc_call_error_func_t error_func; /* call error callback */ rxrpc_call_aemap_func_t aemap_func; /* abort -> errno mapping callback */ const struct rxrpc_operation *ops_begin; /* beginning of operations table */ const struct rxrpc_operation *ops_end; /* end of operations table */ }; /*****************************************************************************/ /* * Rx transport endpoint record */ struct rxrpc_transport { atomic_t usage; struct socket *socket; /* my UDP socket */ struct list_head services; /* services listening on this socket */ struct list_head link; /* link in transport list */ struct list_head proc_link; /* link in transport proc list */ struct list_head krxiodq_link; /* krxiod attention queue link */ spinlock_t lock; /* access lock */ struct list_head peer_active; /* active peers connected to over this socket */ struct list_head peer_graveyard; /* inactive peer list */ spinlock_t peer_gylock; /* peer graveyard lock */ wait_queue_head_t peer_gy_waitq; /* wait queue hit when peer graveyard is empty */ rwlock_t peer_lock; /* peer list access lock */ atomic_t peer_count; /* number of peers */ struct rxrpc_peer_ops *peer_ops; /* default peer operations */ unsigned short port; /* port upon which listening */ volatile char error_rcvd; /* T if received ICMP error outstanding */ }; extern int rxrpc_create_transport(unsigned short port, struct rxrpc_transport **_trans); static inline void rxrpc_get_transport(struct rxrpc_transport *trans) { BUG_ON(atomic_read(&trans->usage) <= 0); atomic_inc(&trans->usage); //printk("rxrpc_get_transport(%p{u=%d})\n", // trans, atomic_read(&trans->usage)); } extern void rxrpc_put_transport(struct rxrpc_transport *trans); extern int rxrpc_add_service(struct rxrpc_transport *trans, struct rxrpc_service *srv); extern void rxrpc_del_service(struct rxrpc_transport *trans, struct rxrpc_service *srv); extern void rxrpc_trans_receive_packet(struct rxrpc_transport *trans); extern int rxrpc_trans_immediate_abort(struct rxrpc_transport *trans, struct rxrpc_message *msg, int error); #endif /* _LINUX_RXRPC_TRANSPORT_H */