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 <linux/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 #define CN_IDX_V86D 0x4 40 #define CN_VAL_V86D_UVESAFB 0x1 41 #define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */ 42 #define CN_DST_IDX 0x6 43 #define CN_DST_VAL 0x1 44 #define CN_IDX_DM 0x7 /* Device Mapper */ 45 #define CN_VAL_DM_USERSPACE_LOG 0x1 46 47 #define CN_NETLINK_USERS 8 48 49 /* 50 * Maximum connector's message size. 51 */ 52 #define CONNECTOR_MAX_MSG_SIZE 16384 53 54 /* 55 * idx and val are unique identifiers which 56 * are used for message routing and 57 * must be registered in connector.h for in-kernel usage. 58 */ 59 60 struct cb_id { 61 __u32 idx; 62 __u32 val; 63 }; 64 65 struct cn_msg { 66 struct cb_id id; 67 68 __u32 seq; 69 __u32 ack; 70 71 __u16 len; /* Length of the following data */ 72 __u16 flags; 73 __u8 data[0]; 74 }; 75 76 /* 77 * Notify structure - requests notification about 78 * registering/unregistering idx/val in range [first, first+range]. 79 */ 80 struct cn_notify_req { 81 __u32 first; 82 __u32 range; 83 }; 84 85 /* 86 * Main notification control message 87 * *_notify_num - number of appropriate cn_notify_req structures after 88 * this struct. 89 * group - notification receiver's idx. 90 * len - total length of the attached data. 91 */ 92 struct cn_ctl_msg { 93 __u32 idx_notify_num; 94 __u32 val_notify_num; 95 __u32 group; 96 __u32 len; 97 __u8 data[0]; 98 }; 99 100 #ifdef __KERNEL__ 101 102 #include <asm/atomic.h> 103 104 #include <linux/list.h> 105 #include <linux/workqueue.h> 106 107 #include <net/sock.h> 108 109 #define CN_CBQ_NAMELEN 32 110 111 struct cn_queue_dev { 112 atomic_t refcnt; 113 unsigned char name[CN_CBQ_NAMELEN]; 114 115 struct workqueue_struct *cn_queue; 116 /* Sent to kevent to create cn_queue only when needed */ 117 struct work_struct wq_creation; 118 /* Tell if the wq_creation job is pending/completed */ 119 atomic_t wq_requested; 120 /* Wait for cn_queue to be created */ 121 wait_queue_head_t wq_created; 122 123 struct list_head queue_list; 124 spinlock_t queue_lock; 125 126 struct sock *nls; 127 }; 128 129 struct cn_callback_id { 130 unsigned char name[CN_CBQ_NAMELEN]; 131 struct cb_id id; 132 }; 133 134 struct cn_callback_data { 135 void (*destruct_data) (void *); 136 void *ddata; 137 138 struct sk_buff *skb; 139 void (*callback) (struct cn_msg *); 140 141 void *free; 142 }; 143 144 struct cn_callback_entry { 145 struct list_head callback_entry; 146 struct work_struct work; 147 struct cn_queue_dev *pdev; 148 149 struct cn_callback_id id; 150 struct cn_callback_data data; 151 152 u32 seq, group; 153 }; 154 155 struct cn_ctl_entry { 156 struct list_head notify_entry; 157 struct cn_ctl_msg *msg; 158 }; 159 160 struct cn_dev { 161 struct cb_id id; 162 163 u32 seq, groups; 164 struct sock *nls; 165 void (*input) (struct sk_buff *skb); 166 167 struct cn_queue_dev *cbdev; 168 }; 169 170 int cn_add_callback(struct cb_id *, char *, void (*callback) (struct cn_msg *)); 171 void cn_del_callback(struct cb_id *); 172 int cn_netlink_send(struct cn_msg *, u32, gfp_t); 173 174 int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(struct cn_msg *)); 175 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); 176 177 int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work); 178 179 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *); 180 void cn_queue_free_dev(struct cn_queue_dev *dev); 181 182 int cn_cb_equal(struct cb_id *, struct cb_id *); 183 184 void cn_queue_wrapper(struct work_struct *work); 185 186 #endif /* __KERNEL__ */ 187 #endif /* __CONNECTOR_H */ 188