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 /*
  28  * Process Events connector unique ids -- used for message routing
  29  */
  30 #define CN_IDX_PROC                     0x1
  31 #define CN_VAL_PROC                     0x1
  32 #define CN_IDX_CIFS                     0x2
  33 #define CN_VAL_CIFS                     0x1
  34 #define CN_W1_IDX                       0x3     /* w1 communication */
  35 #define CN_W1_VAL                       0x1
  36 #define CN_IDX_V86D                     0x4
  37 #define CN_VAL_V86D_UVESAFB             0x1
  38 #define CN_IDX_BB                       0x5     /* BlackBoard, from the TSP GPL sampling framework */
  39 #define CN_DST_IDX                      0x6
  40 #define CN_DST_VAL                      0x1
  41 #define CN_IDX_DM                       0x7     /* Device Mapper */
  42 #define CN_VAL_DM_USERSPACE_LOG         0x1
  43 #define CN_IDX_DRBD                     0x8
  44 #define CN_VAL_DRBD                     0x1
  45
  46 #define CN_NETLINK_USERS                8
  47
  48 /*
  49  * Maximum connector's message size.
  50  */
  51 #define CONNECTOR_MAX_MSG_SIZE          16384
  52
  53 /*
  54  * idx and val are unique identifiers which
  55  * are used for message routing and
  56  * must be registered in connector.h for in-kernel usage.
  57  */
  58
  59 struct cb_id {
  60         __u32 idx;
  61         __u32 val;
  62 };
  63
  64 struct cn_msg {
  65         struct cb_id id;
  66
  67         __u32 seq;
  68         __u32 ack;
  69
  70         __u16 len;              /* Length of the following data */
  71         __u16 flags;
  72         __u8 data[0];
  73 };
  74
  75 #ifdef __KERNEL__
  76
  77 #include <asm/atomic.h>
  78
  79 #include <linux/list.h>
  80 #include <linux/workqueue.h>
  81
  82 #include <net/sock.h>
  83
  84 #define CN_CBQ_NAMELEN          32
  85
  86 struct cn_queue_dev {
  87         atomic_t refcnt;
  88         unsigned char name[CN_CBQ_NAMELEN];
  89
  90         struct workqueue_struct *cn_queue;
  91         /* Sent to kevent to create cn_queue only when needed */
  92         struct work_struct wq_creation;
  93         /* Tell if the wq_creation job is pending/completed */
  94         atomic_t wq_requested;
  95         /* Wait for cn_queue to be created */
  96         wait_queue_head_t wq_created;
  97
  98         struct list_head queue_list;
  99         spinlock_t queue_lock;
 100
 101         struct sock *nls;
 102 };
 103
 104 struct cn_callback_id {
 105         unsigned char name[CN_CBQ_NAMELEN];
 106         struct cb_id id;
 107 };
 108
 109 struct cn_callback_data {
 110         struct sk_buff *skb;
 111         void (*callback) (struct cn_msg *, struct netlink_skb_parms *);
 112
 113         void *free;
 114 };
 115
 116 struct cn_callback_entry {
 117         struct list_head callback_entry;
 118         struct work_struct work;
 119         struct cn_queue_dev *pdev;
 120
 121         struct cn_callback_id id;
 122         struct cn_callback_data data;
 123
 124         u32 seq, group;
 125 };
 126
 127 struct cn_dev {
 128         struct cb_id id;
 129
 130         u32 seq, groups;
 131         struct sock *nls;
 132         void (*input) (struct sk_buff *skb);
 133
 134         struct cn_queue_dev *cbdev;
 135 };
 136
 137 int cn_add_callback(struct cb_id *, char *, void (*callback) (struct cn_msg *, struct netlink_skb_parms *));
 138 void cn_del_callback(struct cb_id *);
 139 int cn_netlink_send(struct cn_msg *, u32, gfp_t);
 140
 141 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 *));
 142 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
 143
 144 int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work);
 145
 146 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
 147 void cn_queue_free_dev(struct cn_queue_dev *dev);
 148
 149 int cn_cb_equal(struct cb_id *, struct cb_id *);
 150
 151 void cn_queue_wrapper(struct work_struct *work);
 152
 153 #endif                          /* __KERNEL__ */
 154 #endif                          /* __CONNECTOR_H */