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