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 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 51 struct cb_id { 52 __u32 idx; 53 __u32 val; 54 }; 55 56 struct 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 */ 71 struct 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 */ 83 struct 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 32 101 102 struct 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 }; 114 115 struct cn_callback_id { 116 unsigned char name[CN_CBQ_NAMELEN]; 117 struct cb_id id; 118 }; 119 120 struct 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 }; 129 130 struct 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 }; 142 143 struct cn_ctl_entry { 144 struct list_head notify_entry; 145 struct cn_ctl_msg *msg; 146 }; 147 148 struct 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 }; 157 158 int cn_add_callback(struct cb_id *, char *, void (*callback) (void *)); 159 void cn_del_callback(struct cb_id *); 160 int cn_netlink_send(struct cn_msg *, u32, gfp_t); 161 162 int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *)); 163 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); 164 165 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *); 166 void cn_queue_free_dev(struct cn_queue_dev *dev); 167 168 int cn_cb_equal(struct cb_id *, struct cb_id *); 169 170 void cn_queue_wrapper(void *data); 171 172 extern int cn_already_initialized; 173 174 #endif /* __KERNEL__ */ 175 #endif /* __CONNECTOR_H */ 176