1 /* 2 * connector.h 3 * 4 * 2004-2005 Copyright (c) Evgeniy Polyakov <[email protected]> 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 #define CN_W1_IDX 0x3 /* w1 communication */ 38 #define CN_W1_VAL 0x1 39 40 41 #define CN_NETLINK_USERS 4 42 43 /* 44 * Maximum connector's message size. 45 */ 46 #define CONNECTOR_MAX_MSG_SIZE 1024 47 48 /* 49 * idx and val are unique identifiers which 50 * are used for message routing and 51 * must be registered in connector.h for in-kernel usage. 52 */ 53 54 struct cb_id { 55 __u32 idx; 56 __u32 val; 57 }; 58 59 struct cn_msg { 60 struct cb_id id; 61 62 __u32 seq; 63 __u32 ack; 64 65 __u16 len; /* Length of the following data */ 66 __u16 flags; 67 __u8 data[0]; 68 }; 69 70 /* 71 * Notify structure - requests notification about 72 * registering/unregistering idx/val in range [first, first+range]. 73 */ 74 struct cn_notify_req { 75 __u32 first; 76 __u32 range; 77 }; 78 79 /* 80 * Main notification control message 81 * *_notify_num - number of appropriate cn_notify_req structures after 82 * this struct. 83 * group - notification receiver's idx. 84 * len - total length of the attached data. 85 */ 86 struct cn_ctl_msg { 87 __u32 idx_notify_num; 88 __u32 val_notify_num; 89 __u32 group; 90 __u32 len; 91 __u8 data[0]; 92 }; 93 94 #ifdef __KERNEL__ 95 96 #include <asm/atomic.h> 97 98 #include <linux/list.h> 99 #include <linux/workqueue.h> 100 101 #include <net/sock.h> 102 103 #define CN_CBQ_NAMELEN 32 104 105 struct cn_queue_dev { 106 atomic_t refcnt; 107 unsigned char name[CN_CBQ_NAMELEN]; 108 109 struct workqueue_struct *cn_queue; 110 111 struct list_head queue_list; 112 spinlock_t queue_lock; 113 114 int netlink_groups; 115 struct sock *nls; 116 }; 117 118 struct cn_callback_id { 119 unsigned char name[CN_CBQ_NAMELEN]; 120 struct cb_id id; 121 }; 122 123 struct cn_callback_data { 124 void (*destruct_data) (void *); 125 void *ddata; 126 127 void *callback_priv; 128 void (*callback) (void *); 129 130 void *free; 131 }; 132 133 struct cn_callback_entry { 134 struct list_head callback_entry; 135 struct cn_callback *cb; 136 struct work_struct work; 137 struct cn_queue_dev *pdev; 138 139 struct cn_callback_id id; 140 struct cn_callback_data data; 141 142 int seq, group; 143 struct sock *nls; 144 }; 145 146 struct cn_ctl_entry { 147 struct list_head notify_entry; 148 struct cn_ctl_msg *msg; 149 }; 150 151 struct cn_dev { 152 struct cb_id id; 153 154 u32 seq, groups; 155 struct sock *nls; 156 void (*input) (struct sock * sk, int len); 157 158 struct cn_queue_dev *cbdev; 159 }; 160 161 int cn_add_callback(struct cb_id *, char *, void (*callback) (void *)); 162 void cn_del_callback(struct cb_id *); 163 int cn_netlink_send(struct cn_msg *, u32, gfp_t); 164 165 int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *)); 166 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); 167 168 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *); 169 void cn_queue_free_dev(struct cn_queue_dev *dev); 170 171 int cn_cb_equal(struct cb_id *, struct cb_id *); 172 173 void cn_queue_wrapper(struct work_struct *work); 174 175 extern int cn_already_initialized; 176 177 #endif /* __KERNEL__ */ 178 #endif /* __CONNECTOR_H */ 179