net/tipc/port.h

   1 /*
   2  * net/tipc/port.h: Include file for TIPC port code
   3  *
   4  * Copyright (c) 1994-2007, Ericsson AB
   5  * Copyright (c) 2004-2007, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #ifndef _TIPC_PORT_H
  38 #define _TIPC_PORT_H
  39
  40 #include "core.h"
  41 #include "ref.h"
  42 #include "net.h"
  43 #include "msg.h"
  44 #include "dbg.h"
  45 #include "node_subscr.h"
  46
  47 /**
  48  * struct user_port - TIPC user port (used with native API)
  49  * @user_ref: id of user who created user port
  50  * @usr_handle: user-specified field
  51  * @ref: object reference to associated TIPC port
  52  * <various callback routines>
  53  * @uport_list: adjacent user ports in list of ports held by user
  54  */
  55
  56 struct user_port {
  57         u32 user_ref;
  58         void *usr_handle;
  59         u32 ref;
  60         tipc_msg_err_event err_cb;
  61         tipc_named_msg_err_event named_err_cb;
  62         tipc_conn_shutdown_event conn_err_cb;
  63         tipc_msg_event msg_cb;
  64         tipc_named_msg_event named_msg_cb;
  65         tipc_conn_msg_event conn_msg_cb;
  66         tipc_continue_event continue_event_cb;
  67         struct list_head uport_list;
  68 };
  69
  70 /**
  71  * struct port - TIPC port structure
  72  * @publ: TIPC port info available to privileged users
  73  * @port_list: adjacent ports in TIPC's global list of ports
  74  * @dispatcher: ptr to routine which handles received messages
  75  * @wakeup: ptr to routine to call when port is no longer congested
  76  * @user_port: ptr to user port associated with port (if any)
  77  * @wait_list: adjacent ports in list of ports waiting on link congestion
  78  * @waiting_pkts:
  79  * @sent:
  80  * @acked:
  81  * @publications: list of publications for port
  82  * @pub_count: total # of publications port has made during its lifetime
  83  * @probing_state:
  84  * @probing_interval:
  85  * @last_in_seqno:
  86  * @timer_ref:
  87  * @subscription: "node down" subscription used to terminate failed connections
  88  */
  89
  90 struct port {
  91         struct tipc_port publ;
  92         struct list_head port_list;
  93         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
  94         void (*wakeup)(struct tipc_port *);
  95         struct user_port *user_port;
  96         struct list_head wait_list;
  97         u32 waiting_pkts;
  98         u32 sent;
  99         u32 acked;
 100         struct list_head publications;
 101         u32 pub_count;
 102         u32 probing_state;
 103         u32 probing_interval;
 104         u32 last_in_seqno;
 105         struct timer_list timer;
 106         struct tipc_node_subscr subscription;
 107 };
 108
 109 extern spinlock_t tipc_port_list_lock;
 110 struct port_list;
 111
 112 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
 113                               struct iovec const *msg_sect, u32 num_sect,
 114                               int err);
 115 struct sk_buff *tipc_port_get_ports(void);
 116 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space);
 117 void tipc_port_recv_proto_msg(struct sk_buff *buf);
 118 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
 119 void tipc_port_reinit(void);
 120
 121 /**
 122  * tipc_port_lock - lock port instance referred to and return its pointer
 123  */
 124
 125 static inline struct port *tipc_port_lock(u32 ref)
 126 {
 127         return (struct port *)tipc_ref_lock(ref);
 128 }
 129
 130 /**
 131  * tipc_port_unlock - unlock a port instance
 132  *
 133  * Can use pointer instead of tipc_ref_unlock() since port is already locked.
 134  */
 135
 136 static inline void tipc_port_unlock(struct port *p_ptr)
 137 {
 138         spin_unlock_bh(p_ptr->publ.lock);
 139 }
 140
 141 static inline struct port* tipc_port_deref(u32 ref)
 142 {
 143         return (struct port *)tipc_ref_deref(ref);
 144 }
 145
 146 static inline u32 tipc_peer_port(struct port *p_ptr)
 147 {
 148         return msg_destport(&p_ptr->publ.phdr);
 149 }
 150
 151 static inline u32 tipc_peer_node(struct port *p_ptr)
 152 {
 153         return msg_destnode(&p_ptr->publ.phdr);
 154 }
 155
 156 static inline int tipc_port_congested(struct port *p_ptr)
 157 {
 158         return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
 159 }
 160
 161 /**
 162  * tipc_port_recv_msg - receive message from lower layer and deliver to port user
 163  */
 164
 165 static inline int tipc_port_recv_msg(struct sk_buff *buf)
 166 {
 167         struct port *p_ptr;
 168         struct tipc_msg *msg = buf_msg(buf);
 169         u32 destport = msg_destport(msg);
 170         u32 dsz = msg_data_sz(msg);
 171         u32 err;
 172
 173         /* forward unresolved named message */
 174         if (unlikely(!destport)) {
 175                 tipc_net_route_msg(buf);
 176                 return dsz;
 177         }
 178
 179         /* validate destination & pass to port, otherwise reject message */
 180         p_ptr = tipc_port_lock(destport);
 181         if (likely(p_ptr)) {
 182                 if (likely(p_ptr->publ.connected)) {
 183                         if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) ||
 184                             (unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) ||
 185                             (unlikely(!msg_connected(msg)))) {
 186                                 err = TIPC_ERR_NO_PORT;
 187                                 tipc_port_unlock(p_ptr);
 188                                 goto reject;
 189                         }
 190                 }
 191                 err = p_ptr->dispatcher(&p_ptr->publ, buf);
 192                 tipc_port_unlock(p_ptr);
 193                 if (likely(!err))
 194                         return dsz;
 195         } else {
 196                 err = TIPC_ERR_NO_PORT;
 197         }
 198 reject:
 199         dbg("port->rejecting, err = %x..\n",err);
 200         return tipc_reject_msg(buf, err);
 201 }
 202
 203 #endif