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 <linux/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 #define CN_W1_IDX                       0x3     /* w1 communication */
  38 #define CN_W1_VAL                       0x1
  39 #define CN_IDX_V86D                     0x4
  40 #define CN_VAL_V86D_UVESAFB             0x1
  41 #define CN_IDX_BB                       0x5     /* BlackBoard, from the TSP GPL sampling framework */
  42 #define CN_DST_IDX                      0x6
  43 #define CN_DST_VAL                      0x1
  44 #define CN_IDX_DM                       0x7     /* Device Mapper */
  45 #define CN_VAL_DM_USERSPACE_LOG         0x1
  46 #define CN_IDX_DRBD                     0x8
  47 #define CN_VAL_DRBD                     0x1
  48
  49 #define CN_NETLINK_USERS                8
  50
  51 /*
  52  * Maximum connector's message size.
  53  */
  54 #define CONNECTOR_MAX_MSG_SIZE          16384
  55
  56 /*
  57  * idx and val are unique identifiers which
  58  * are used for message routing and
  59  * must be registered in connector.h for in-kernel usage.
  60  */
  61
  62 struct cb_id {
  63         __u32 idx;
  64         __u32 val;
  65 };
  66
  67 struct cn_msg {
  68         struct cb_id id;
  69
  70         __u32 seq;
  71         __u32 ack;
  72
  73         __u16 len;              /* Length of the following data */
  74         __u16 flags;
  75         __u8 data[0];
  76 };
  77
  78 /*
  79  * Notify structure - requests notification about
  80  * registering/unregistering idx/val in range [first, first+range].
  81  */
  82 struct cn_notify_req {
  83         __u32 first;
  84         __u32 range;
  85 };
  86
  87 /*
  88  * Main notification control message
  89  * *_notify_num         - number of appropriate cn_notify_req structures after
  90  *                              this struct.
  91  * group                - notification receiver's idx.
  92  * len                  - total length of the attached data.
  93  */
  94 struct cn_ctl_msg {
  95         __u32 idx_notify_num;
  96         __u32 val_notify_num;
  97         __u32 group;
  98         __u32 len;
  99         __u8 data[0];
 100 };
 101
 102 #ifdef __KERNEL__
 103
 104 #include <asm/atomic.h>
 105
 106 #include <linux/list.h>
 107 #include <linux/workqueue.h>
 108
 109 #include <net/sock.h>
 110
 111 #define CN_CBQ_NAMELEN          32
 112
 113 struct cn_queue_dev {
 114         atomic_t refcnt;
 115         unsigned char name[CN_CBQ_NAMELEN];
 116
 117         struct workqueue_struct *cn_queue;
 118         /* Sent to kevent to create cn_queue only when needed */
 119         struct work_struct wq_creation;
 120         /* Tell if the wq_creation job is pending/completed */
 121         atomic_t wq_requested;
 122         /* Wait for cn_queue to be created */
 123         wait_queue_head_t wq_created;
 124
 125         struct list_head queue_list;
 126         spinlock_t queue_lock;
 127
 128         struct sock *nls;
 129 };
 130
 131 struct cn_callback_id {
 132         unsigned char name[CN_CBQ_NAMELEN];
 133         struct cb_id id;
 134 };
 135
 136 struct cn_callback_data {
 137         struct sk_buff *skb;
 138         void (*callback) (struct cn_msg *, struct netlink_skb_parms *);
 139
 140         void *free;
 141 };
 142
 143 struct cn_callback_entry {
 144         struct list_head callback_entry;
 145         struct work_struct work;
 146         struct cn_queue_dev *pdev;
 147
 148         struct cn_callback_id id;
 149         struct cn_callback_data data;
 150
 151         u32 seq, group;
 152 };
 153
 154 struct cn_ctl_entry {
 155         struct list_head notify_entry;
 156         struct cn_ctl_msg *msg;
 157 };
 158
 159 struct cn_dev {
 160         struct cb_id id;
 161
 162         u32 seq, groups;
 163         struct sock *nls;
 164         void (*input) (struct sk_buff *skb);
 165
 166         struct cn_queue_dev *cbdev;
 167 };
 168
 169 int cn_add_callback(struct cb_id *, char *, void (*callback) (struct cn_msg *, struct netlink_skb_parms *));
 170 void cn_del_callback(struct cb_id *);
 171 int cn_netlink_send(struct cn_msg *, u32, gfp_t);
 172
 173 int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
 174 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
 175
 176 int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work);
 177
 178 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
 179 void cn_queue_free_dev(struct cn_queue_dev *dev);
 180
 181 int cn_cb_equal(struct cb_id *, struct cb_id *);
 182
 183 void cn_queue_wrapper(struct work_struct *work);
 184
 185 #endif                          /* __KERNEL__ */
 186 #endif                          /* __CONNECTOR_H */