/* * net/tipc/port.h: Include file for TIPC port code * * Copyright (c) 1994-2006, Ericsson AB * Copyright (c) 2004-2005, Wind River Systems * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the names of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef _TIPC_PORT_H #define _TIPC_PORT_H #include "core.h" #include "ref.h" #include "net.h" #include "msg.h" #include "dbg.h" #include "node_subscr.h" /** * struct user_port - TIPC user port (used with native API) * @user_ref: id of user who created user port * @usr_handle: user-specified field * @ref: object reference to associated TIPC port * <various callback routines> * @uport_list: adjacent user ports in list of ports held by user */ struct user_port { u32 user_ref; void *usr_handle; u32 ref; tipc_msg_err_event err_cb; tipc_named_msg_err_event named_err_cb; tipc_conn_shutdown_event conn_err_cb; tipc_msg_event msg_cb; tipc_named_msg_event named_msg_cb; tipc_conn_msg_event conn_msg_cb; tipc_continue_event continue_event_cb; struct list_head uport_list; }; /** * struct port - TIPC port structure * @publ: TIPC port info available to privileged users * @port_list: adjacent ports in TIPC's global list of ports * @dispatcher: ptr to routine which handles received messages * @wakeup: ptr to routine to call when port is no longer congested * @user_port: ptr to user port associated with port (if any) * @wait_list: adjacent ports in list of ports waiting on link congestion * @congested_link: ptr to congested link port is waiting on * @waiting_pkts: * @sent: * @acked: * @publications: list of publications for port * @pub_count: total # of publications port has made during its lifetime * @max_pkt: maximum packet size "hint" used when building messages sent by port * @probing_state: * @probing_interval: * @last_in_seqno: * @timer_ref: * @subscription: "node down" subscription used to terminate failed connections */ struct port { struct tipc_port publ; struct list_head port_list; u32 (*dispatcher)(struct tipc_port *, struct sk_buff *); void (*wakeup)(struct tipc_port *); struct user_port *user_port; struct list_head wait_list; struct link *congested_link; u32 waiting_pkts; u32 sent; u32 acked; struct list_head publications; u32 pub_count; u32 max_pkt; u32 probing_state; u32 probing_interval; u32 last_in_seqno; struct timer_list timer; struct node_subscr subscription; }; extern spinlock_t tipc_port_list_lock; struct port_list; int tipc_port_recv_sections(struct port *p_ptr, u32 num_sect, struct iovec const *msg_sect); int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr, struct iovec const *msg_sect, u32 num_sect, int err); struct sk_buff *tipc_port_get_ports(void); struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space); void tipc_port_recv_proto_msg(struct sk_buff *buf); void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp); void tipc_port_reinit(void); /** * tipc_port_lock - lock port instance referred to and return its pointer */ static inline struct port *tipc_port_lock(u32 ref) { return (struct port *)tipc_ref_lock(ref); } /** * tipc_port_unlock - unlock a port instance * * Can use pointer instead of tipc_ref_unlock() since port is already locked. */ static inline void tipc_port_unlock(struct port *p_ptr) { spin_unlock_bh(p_ptr->publ.lock); } static inline struct port* tipc_port_deref(u32 ref) { return (struct port *)tipc_ref_deref(ref); } static inline u32 tipc_peer_port(struct port *p_ptr) { return msg_destport(&p_ptr->publ.phdr); } static inline u32 tipc_peer_node(struct port *p_ptr) { return msg_destnode(&p_ptr->publ.phdr); } static inline int tipc_port_congested(struct port *p_ptr) { return((p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2)); } /** * tipc_port_recv_msg - receive message from lower layer and deliver to port user */ static inline int tipc_port_recv_msg(struct sk_buff *buf) { struct port *p_ptr; struct tipc_msg *msg = buf_msg(buf); u32 destport = msg_destport(msg); u32 dsz = msg_data_sz(msg); u32 err; /* forward unresolved named message */ if (unlikely(!destport)) { tipc_net_route_msg(buf); return dsz; } /* validate destination & pass to port, otherwise reject message */ p_ptr = tipc_port_lock(destport); if (likely(p_ptr)) { if (likely(p_ptr->publ.connected)) { if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) || (unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) || (unlikely(!msg_connected(msg)))) { err = TIPC_ERR_NO_PORT; tipc_port_unlock(p_ptr); goto reject; } } err = p_ptr->dispatcher(&p_ptr->publ, buf); tipc_port_unlock(p_ptr); if (likely(!err)) return dsz; } else { err = TIPC_ERR_NO_PORT; } reject: dbg("port->rejecting, err = %x..\n",err); return tipc_reject_msg(buf, err); } #endif