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