LXR linux/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 <asm/types.h>
  26
  27#define CN_IDX_CONNECTOR                0xffffffff
  28#define CN_VAL_CONNECTOR                0xffffffff
  29
  30/*
  31 * Process Events connector unique ids -- used for message routing
  32 */
  33#define CN_IDX_PROC                     0x1
  34#define CN_VAL_PROC                     0x1
  35#define CN_IDX_CIFS                     0x2
  36#define CN_VAL_CIFS                     0x1
  37
  38#define CN_NETLINK_USERS                1
  39
  40/*
  41 * Maximum connector's message size.
  42 */
  43#define CONNECTOR_MAX_MSG_SIZE  1024
  44
  45/*
  46 * idx and val are unique identifiers which 
  47 * are used for message routing and 
  48 * must be registered in connector.h for in-kernel usage.
  49 */
  50
  51struct cb_id {
  52        __u32 idx;
  53        __u32 val;
  54};
  55
  56struct cn_msg {
  57        struct cb_id id;
  58
  59        __u32 seq;
  60        __u32 ack;
  61
  62        __u16 len;              /* Length of the following data */
  63        __u16 flags;
  64        __u8 data[0];
  65};
  66
  67/*
  68 * Notify structure - requests notification about
  69 * registering/unregistering idx/val in range [first, first+range].
  70 */
  71struct cn_notify_req {
  72        __u32 first;
  73        __u32 range;
  74};
  75
  76/*
  77 * Main notification control message
  78 * *_notify_num         - number of appropriate cn_notify_req structures after 
  79 *                              this struct.
  80 * group                - notification receiver's idx.
  81 * len                  - total length of the attached data.
  82 */
  83struct cn_ctl_msg {
  84        __u32 idx_notify_num;
  85        __u32 val_notify_num;
  86        __u32 group;
  87        __u32 len;
  88        __u8 data[0];
  89};
  90
  91#ifdef __KERNEL__
  92
  93#include <asm/atomic.h>
  94
  95#include <linux/list.h>
  96#include <linux/workqueue.h>
  97
  98#include <net/sock.h>
  99
 100#define CN_CBQ_NAMELEN          32
 101
 102struct cn_queue_dev {
 103        atomic_t refcnt;
 104        unsigned char name[CN_CBQ_NAMELEN];
 105
 106        struct workqueue_struct *cn_queue;
 107
 108        struct list_head queue_list;
 109        spinlock_t queue_lock;
 110
 111        int netlink_groups;
 112        struct sock *nls;
 113};
 114
 115struct cn_callback_id {
 116        unsigned char name[CN_CBQ_NAMELEN];
 117        struct cb_id id;
 118};
 119
 120struct cn_callback_data {
 121        void (*destruct_data) (void *);
 122        void *ddata;
 123        
 124        void *callback_priv;
 125        void (*callback) (void *);
 126
 127        void *free;
 128};
 129
 130struct cn_callback_entry {
 131        struct list_head callback_entry;
 132        struct cn_callback *cb;
 133        struct work_struct work;
 134        struct cn_queue_dev *pdev;
 135
 136        struct cn_callback_id id;
 137        struct cn_callback_data data;
 138
 139        int seq, group;
 140        struct sock *nls;
 141};
 142
 143struct cn_ctl_entry {
 144        struct list_head notify_entry;
 145        struct cn_ctl_msg *msg;
 146};
 147
 148struct cn_dev {
 149        struct cb_id id;
 150
 151        u32 seq, groups;
 152        struct sock *nls;
 153        void (*input) (struct sock * sk, int len);
 154
 155        struct cn_queue_dev *cbdev;
 156};
 157
 158int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
 159void cn_del_callback(struct cb_id *);
 160int cn_netlink_send(struct cn_msg *, u32, gfp_t);
 161
 162int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));
 163void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
 164
 165struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
 166void cn_queue_free_dev(struct cn_queue_dev *dev);
 167
 168int cn_cb_equal(struct cb_id *, struct cb_id *);
 169
 170void cn_queue_wrapper(void *data);
 171
 172extern int cn_already_initialized;
 173
 174#endif                          /* __KERNEL__ */
 175#endif                          /* __CONNECTOR_H */
 176