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 /*
  31  * Process Events connector unique ids -- used for message routing
  32  */
  33 #define CN_IDX_PROC                     0x1
  34 #define CN_VAL_PROC                     0x1
  35 #define CN_IDX_CIFS                     0x2
  36 #define CN_VAL_CIFS                     0x1
  37
  38 #define CN_NETLINK_USERS                1
  39
  40 /*
  41  * Maximum connector's message size.
  42  */
  43 #define CONNECTOR_MAX_MSG_SIZE  1024
  44
  45 /*
  46  * idx and val are unique identifiers which
  47  * are used for message routing and
  48  * must be registered in connector.h for in-kernel usage.
  49  */
  50
  51 struct cb_id {
  52         __u32 idx;
  53         __u32 val;
  54 };
  55
  56 struct cn_msg {
  57         struct cb_id id;
  58
  59         __u32 seq;
  60         __u32 ack;
  61
  62         __u16 len;              /* Length of the following data */
  63         __u16 flags;
  64         __u8 data[0];
  65 };
  66
  67 /*
  68  * Notify structure - requests notification about
  69  * registering/unregistering idx/val in range [first, first+range].
  70  */
  71 struct cn_notify_req {
  72         __u32 first;
  73         __u32 range;
  74 };
  75
  76 /*
  77  * Main notification control message
  78  * *_notify_num         - number of appropriate cn_notify_req structures after
  79  *                              this struct.
  80  * group                - notification receiver's idx.
  81  * len                  - total length of the attached data.
  82  */
  83 struct cn_ctl_msg {
  84         __u32 idx_notify_num;
  85         __u32 val_notify_num;
  86         __u32 group;
  87         __u32 len;
  88         __u8 data[0];
  89 };
  90
  91 #ifdef __KERNEL__
  92
  93 #include <asm/atomic.h>
  94
  95 #include <linux/list.h>
  96 #include <linux/workqueue.h>
  97
  98 #include <net/sock.h>
  99
 100 #define CN_CBQ_NAMELEN          32
 101
 102 struct cn_queue_dev {
 103         atomic_t refcnt;
 104         unsigned char name[CN_CBQ_NAMELEN];
 105
 106         struct workqueue_struct *cn_queue;
 107
 108         struct list_head queue_list;
 109         spinlock_t queue_lock;
 110
 111         int netlink_groups;
 112         struct sock *nls;
 113 };
 114
 115 struct cn_callback_id {
 116         unsigned char name[CN_CBQ_NAMELEN];
 117         struct cb_id id;
 118 };
 119
 120 struct cn_callback_data {
 121         void (*destruct_data) (void *);
 122         void *ddata;
 123
 124         void *callback_priv;
 125         void (*callback) (void *);
 126
 127         void *free;
 128 };
 129
 130 struct cn_callback_entry {
 131         struct list_head callback_entry;
 132         struct cn_callback *cb;
 133         struct work_struct work;
 134         struct cn_queue_dev *pdev;
 135
 136         struct cn_callback_id id;
 137         struct cn_callback_data data;
 138
 139         int seq, group;
 140         struct sock *nls;
 141 };
 142
 143 struct cn_ctl_entry {
 144         struct list_head notify_entry;
 145         struct cn_ctl_msg *msg;
 146 };
 147
 148 struct cn_dev {
 149         struct cb_id id;
 150
 151         u32 seq, groups;
 152         struct sock *nls;
 153         void (*input) (struct sock * sk, int len);
 154
 155         struct cn_queue_dev *cbdev;
 156 };
 157
 158 int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
 159 void cn_del_callback(struct cb_id *);
 160 int cn_netlink_send(struct cn_msg *, u32, gfp_t);
 161
 162 int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));
 163 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
 164
 165 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
 166 void cn_queue_free_dev(struct cn_queue_dev *dev);
 167
 168 int cn_cb_equal(struct cb_id *, struct cb_id *);
 169
 170 void cn_queue_wrapper(void *data);
 171
 172 extern int cn_already_initialized;
 173
 174 #endif                          /* __KERNEL__ */
 175 #endif                          /* __CONNECTOR_H */