linux/include/linux/connector.h
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   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
  61struct cb_id {
  62        __u32 idx;
  63        __u32 val;
  64};
  65
  66struct 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
  88struct 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
  98struct cn_callback_id {
  99        unsigned char name[CN_CBQ_NAMELEN];
 100        struct cb_id id;
 101};
 102
 103struct 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
 114struct 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
 124int cn_add_callback(struct cb_id *id, const char *name,
 125                    void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
 126void cn_del_callback(struct cb_id *);
 127int cn_netlink_send(struct cn_msg *, u32, gfp_t);
 128
 129int 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 *));
 132void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
 133void cn_queue_release_callback(struct cn_callback_entry *);
 134
 135struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *);
 136void cn_queue_free_dev(struct cn_queue_dev *dev);
 137
 138int cn_cb_equal(struct cb_id *, struct cb_id *);
 139
 140#endif                          /* __KERNEL__ */
 141#endif                          /* __CONNECTOR_H */
 142
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