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 43 #define CN_NETLINK_USERS 6 44 45 /* 46 * Maximum connector's message size. 47 */ 48 #define CONNECTOR_MAX_MSG_SIZE 16384 49 50 /* 51 * idx and val are unique identifiers which 52 * are used for message routing and 53 * must be registered in connector.h for in-kernel usage. 54 */ 55 56 struct cb_id { 57 __u32 idx; 58 __u32 val; 59 }; 60 61 struct cn_msg { 62 struct cb_id id; 63 64 __u32 seq; 65 __u32 ack; 66 67 __u16 len; /* Length of the following data */ 68 __u16 flags; 69 __u8 data[0]; 70 }; 71 72 /* 73 * Notify structure - requests notification about 74 * registering/unregistering idx/val in range [first, first+range]. 75 */ 76 struct cn_notify_req { 77 __u32 first; 78 __u32 range; 79 }; 80 81 /* 82 * Main notification control message 83 * *_notify_num - number of appropriate cn_notify_req structures after 84 * this struct. 85 * group - notification receiver's idx. 86 * len - total length of the attached data. 87 */ 88 struct cn_ctl_msg { 89 __u32 idx_notify_num; 90 __u32 val_notify_num; 91 __u32 group; 92 __u32 len; 93 __u8 data[0]; 94 }; 95 96 #ifdef __KERNEL__ 97 98 #include <asm/atomic.h> 99 100 #include <linux/list.h> 101 #include <linux/workqueue.h> 102 103 #include <net/sock.h> 104 105 #define CN_CBQ_NAMELEN 32 106 107 struct cn_queue_dev { 108 atomic_t refcnt; 109 unsigned char name[CN_CBQ_NAMELEN]; 110 111 struct workqueue_struct *cn_queue; 112 /* Sent to kevent to create cn_queue only when needed */ 113 struct work_struct wq_creation; 114 /* Tell if the wq_creation job is pending/completed */ 115 atomic_t wq_requested; 116 /* Wait for cn_queue to be created */ 117 wait_queue_head_t wq_created; 118 119 struct list_head queue_list; 120 spinlock_t queue_lock; 121 122 struct sock *nls; 123 }; 124 125 struct cn_callback_id { 126 unsigned char name[CN_CBQ_NAMELEN]; 127 struct cb_id id; 128 }; 129 130 struct cn_callback_data { 131 void (*destruct_data) (void *); 132 void *ddata; 133 134 void *callback_priv; 135 void (*callback) (void *); 136 137 void *free; 138 }; 139 140 struct cn_callback_entry { 141 struct list_head callback_entry; 142 struct work_struct work; 143 struct cn_queue_dev *pdev; 144 145 struct cn_callback_id id; 146 struct cn_callback_data data; 147 148 u32 seq, group; 149 }; 150 151 struct cn_ctl_entry { 152 struct list_head notify_entry; 153 struct cn_ctl_msg *msg; 154 }; 155 156 struct cn_dev { 157 struct cb_id id; 158 159 u32 seq, groups; 160 struct sock *nls; 161 void (*input) (struct sk_buff *skb); 162 163 struct cn_queue_dev *cbdev; 164 }; 165 166 int cn_add_callback(struct cb_id *, char *, void (*callback) (void *)); 167 void cn_del_callback(struct cb_id *); 168 int cn_netlink_send(struct cn_msg *, u32, gfp_t); 169 170 int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *)); 171 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); 172 173 int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work); 174 175 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *); 176 void cn_queue_free_dev(struct cn_queue_dev *dev); 177 178 int cn_cb_equal(struct cb_id *, struct cb_id *); 179 180 void cn_queue_wrapper(struct work_struct *work); 181 182 #endif /* __KERNEL__ */ 183 #endif /* __CONNECTOR_H */ 184