include/linux/connector.h

   1 /*
   2  *      connector.h
   3  *
   4  * 2004-2005 Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
   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 #define CN_KVP_IDX                      0x9     /* HyperV KVP */
  46 #define CN_KVP_VAL                      0x1     /* queries from the kernel */
  47
  48 #define CN_NETLINK_USERS                10      /* Highest index + 1 */
  49
  50 /*
  51  * Maximum connector's message size.
  52  */
  53 #define CONNECTOR_MAX_MSG_SIZE          16384
  54
  55 /*
  56  * idx and val are unique identifiers which
  57  * are used for message routing and
  58  * must be registered in connector.h for in-kernel usage.
  59  */
  60
  61 struct cb_id {
  62         __u32 idx;
  63         __u32 val;
  64 };
  65
  66 struct cn_msg {
  67         struct cb_id id;
  68
  69         __u32 seq;
  70         __u32 ack;
  71
  72         __u16 len;              /* Length of the following data */
  73         __u16 flags;
  74         __u8 data[0];
  75 };
  76
  77 #ifdef __KERNEL__
  78
  79 #include <linux/atomic.h>
  80
  81 #include <linux/list.h>
  82 #include <linux/workqueue.h>
  83
  84 #include <net/sock.h>
  85
  86 #define CN_CBQ_NAMELEN          32
  87
  88 struct cn_queue_dev {
  89         atomic_t refcnt;
  90         unsigned char name[CN_CBQ_NAMELEN];
  91
  92         struct list_head queue_list;
  93         spinlock_t queue_lock;
  94
  95         struct sock *nls;
  96 };
  97
  98 struct cn_callback_id {
  99         unsigned char name[CN_CBQ_NAMELEN];
 100         struct cb_id id;
 101 };
 102
 103 struct cn_callback_entry {
 104         struct list_head callback_entry;
 105         atomic_t refcnt;
 106         struct cn_queue_dev *pdev;
 107
 108         struct cn_callback_id id;
 109         void (*callback) (struct cn_msg *, struct netlink_skb_parms *);
 110
 111         u32 seq, group;
 112 };
 113
 114 struct cn_dev {
 115         struct cb_id id;
 116
 117         u32 seq, groups;
 118         struct sock *nls;
 119         void (*input) (struct sk_buff *skb);
 120
 121         struct cn_queue_dev *cbdev;
 122 };
 123
 124 int cn_add_callback(struct cb_id *id, const char *name,
 125                     void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
 126 void cn_del_callback(struct cb_id *);
 127 int cn_netlink_send(struct cn_msg *, u32, gfp_t);
 128
 129 int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name,
 130                           struct cb_id *id,
 131                           void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
 132 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
 133 void cn_queue_release_callback(struct cn_callback_entry *);
 134
 135 struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *);
 136 void cn_queue_free_dev(struct cn_queue_dev *dev);
 137
 138 int cn_cb_equal(struct cb_id *, struct cb_id *);
 139
 140 #endif                          /* __KERNEL__ */
 141 #endif                          /* __CONNECTOR_H */