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Diffstat (limited to 'net/tipc/port.h')
| -rw-r--r-- | net/tipc/port.h | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/net/tipc/port.h b/net/tipc/port.h new file mode 100644 index 00000000..8d1652aa --- /dev/null +++ b/net/tipc/port.h @@ -0,0 +1,205 @@ +/* + * net/tipc/port.h: Include file for TIPC port code + * + * Copyright (c) 1994-2007, Ericsson AB + * Copyright (c) 2004-2007, 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 + * @waiting_pkts: + * @sent: + * @acked: + * @publications: list of publications for port + * @pub_count: total # of publications port has made during its lifetime + * @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; + u32 waiting_pkts; + u32 sent; + u32 acked; + struct list_head publications; + u32 pub_count; + u32 probing_state; + u32 probing_interval; + u32 last_in_seqno; + struct timer_list timer; + struct tipc_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 |