include/linux/connector.h

   1 /*
   2  *      connector.h
   3  *
   4  * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
   5  * All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #ifndef __CONNECTOR_H
  23 #define __CONNECTOR_H
  24
  25 #include <asm/types.h>
  26
  27 #define CN_IDX_CONNECTOR                0xffffffff
  28 #define CN_VAL_CONNECTOR                0xffffffff
  29
  30 #define CN_NETLINK_USERS                1
  31
  32 /*
  33  * Maximum connector's message size.
  34  */
  35 #define CONNECTOR_MAX_MSG_SIZE  1024
  36
  37 /*
  38  * idx and val are unique identifiers which
  39  * are used for message routing and
  40  * must be registered in connector.h for in-kernel usage.
  41  */
  42
  43 struct cb_id {
  44         __u32 idx;
  45         __u32 val;
  46 };
  47
  48 struct cn_msg {
  49         struct cb_id id;
  50
  51         __u32 seq;
  52         __u32 ack;
  53
  54         __u16 len;              /* Length of the following data */
  55         __u16 flags;
  56         __u8 data[0];
  57 };
  58
  59 /*
  60  * Notify structure - requests notification about
  61  * registering/unregistering idx/val in range [first, first+range].
  62  */
  63 struct cn_notify_req {
  64         __u32 first;
  65         __u32 range;
  66 };
  67
  68 /*
  69  * Main notification control message
  70  * *_notify_num         - number of appropriate cn_notify_req structures after
  71  *                              this struct.
  72  * group                - notification receiver's idx.
  73  * len                  - total length of the attached data.
  74  */
  75 struct cn_ctl_msg {
  76         __u32 idx_notify_num;
  77         __u32 val_notify_num;
  78         __u32 group;
  79         __u32 len;
  80         __u8 data[0];
  81 };
  82
  83 #ifdef __KERNEL__
  84
  85 #include <asm/atomic.h>
  86
  87 #include <linux/list.h>
  88 #include <linux/workqueue.h>
  89
  90 #include <net/sock.h>
  91
  92 #define CN_CBQ_NAMELEN          32
  93
  94 struct cn_queue_dev {
  95         atomic_t refcnt;
  96         unsigned char name[CN_CBQ_NAMELEN];
  97
  98         struct workqueue_struct *cn_queue;
  99
 100         struct list_head queue_list;
 101         spinlock_t queue_lock;
 102
 103         int netlink_groups;
 104         struct sock *nls;
 105 };
 106
 107 struct cn_callback {
 108         unsigned char name[CN_CBQ_NAMELEN];
 109
 110         struct cb_id id;
 111         void (*callback) (void *);
 112         void *priv;
 113 };
 114
 115 struct cn_callback_entry {
 116         struct list_head callback_entry;
 117         struct cn_callback *cb;
 118         struct work_struct work;
 119         struct cn_queue_dev *pdev;
 120
 121         void (*destruct_data) (void *);
 122         void *ddata;
 123
 124         int seq, group;
 125         struct sock *nls;
 126 };
 127
 128 struct cn_ctl_entry {
 129         struct list_head notify_entry;
 130         struct cn_ctl_msg *msg;
 131 };
 132
 133 struct cn_dev {
 134         struct cb_id id;
 135
 136         u32 seq, groups;
 137         struct sock *nls;
 138         void (*input) (struct sock * sk, int len);
 139
 140         struct cn_queue_dev *cbdev;
 141 };
 142
 143 int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
 144 void cn_del_callback(struct cb_id *);
 145 int cn_netlink_send(struct cn_msg *, u32, int);
 146
 147 int cn_queue_add_callback(struct cn_queue_dev *dev, struct cn_callback *cb);
 148 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
 149
 150 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
 151 void cn_queue_free_dev(struct cn_queue_dev *dev);
 152
 153 int cn_cb_equal(struct cb_id *, struct cb_id *);
 154
 155 extern int cn_already_initialized;
 156
 157 #endif                          /* __KERNEL__ */
 158 #endif                          /* __CONNECTOR_H */