include/rxrpc/connection.h

   1 /* connection.h: Rx connection record
   2  *
   3  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef _LINUX_RXRPC_CONNECTION_H
  13 #define _LINUX_RXRPC_CONNECTION_H
  14
  15 #include <rxrpc/types.h>
  16 #include <rxrpc/krxtimod.h>
  17
  18 struct sk_buff;
  19
  20 /*****************************************************************************/
  21 /*
  22  * Rx connection
  23  * - connections are matched by (rmt_port,rmt_addr,service_id,conn_id,clientflag)
  24  * - connections only retain a refcount on the peer when they are active
  25  * - connections with refcount==0 are inactive and reside in the peer's graveyard
  26  */
  27 struct rxrpc_connection
  28 {
  29         atomic_t                usage;
  30         struct rxrpc_transport  *trans;         /* transport endpoint */
  31         struct rxrpc_peer       *peer;          /* peer from/to which connected */
  32         struct rxrpc_service    *service;       /* responsible service (inbound conns) */
  33         struct rxrpc_timer      timeout;        /* decaching timer */
  34         struct list_head        link;           /* link in peer's list */
  35         struct list_head        proc_link;      /* link in proc list */
  36         struct list_head        err_link;       /* link in ICMP error processing list */
  37         struct list_head        id_link;        /* link in ID grant list */
  38         struct sockaddr_in      addr;           /* remote address */
  39         struct rxrpc_call       *channels[4];   /* channels (active calls) */
  40         wait_queue_head_t       chanwait;       /* wait for channel to become available */
  41         spinlock_t              lock;           /* access lock */
  42         struct timeval          atime;          /* last access time */
  43         size_t                  mtu_size;       /* MTU size for outbound messages */
  44         unsigned                call_counter;   /* call ID counter */
  45         rxrpc_serial_t          serial_counter; /* packet serial number counter */
  46
  47         /* the following should all be in net order */
  48         __be32                  in_epoch;       /* peer's epoch */
  49         __be32                  out_epoch;      /* my epoch */
  50         __be32                  conn_id;        /* connection ID, appropriately shifted */
  51         __be16                  service_id;     /* service ID */
  52         uint8_t                 security_ix;    /* security ID */
  53         uint8_t                 in_clientflag;  /* RXRPC_CLIENT_INITIATED if we are server */
  54         uint8_t                 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
  55 };
  56
  57 extern int rxrpc_create_connection(struct rxrpc_transport *trans,
  58                                    __be16 port,
  59                                    __be32 addr,
  60                                    uint16_t service_id,
  61                                    void *security,
  62                                    struct rxrpc_connection **_conn);
  63
  64 extern int rxrpc_connection_lookup(struct rxrpc_peer *peer,
  65                                    struct rxrpc_message *msg,
  66                                    struct rxrpc_connection **_conn);
  67
  68 static inline void rxrpc_get_connection(struct rxrpc_connection *conn)
  69 {
  70         BUG_ON(atomic_read(&conn->usage)<0);
  71         atomic_inc(&conn->usage);
  72         //printk("rxrpc_get_conn(%p{u=%d})\n",conn,atomic_read(&conn->usage));
  73 }
  74
  75 extern void rxrpc_put_connection(struct rxrpc_connection *conn);
  76
  77 extern int rxrpc_conn_receive_call_packet(struct rxrpc_connection *conn,
  78                                           struct rxrpc_call *call,
  79                                           struct rxrpc_message *msg);
  80
  81 extern void rxrpc_conn_handle_error(struct rxrpc_connection *conn, int local, int errno);
  82
  83 #endif /* _LINUX_RXRPC_CONNECTION_H */