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 45 #define CN_NETLINK_USERS 7 46 47 /* 48 * Maximum connector's message size. 49 */ 50 #define CONNECTOR_MAX_MSG_SIZE 16384 51 52 /* 53 * idx and val are unique identifiers which 54 * are used for message routing and 55 * must be registered in connector.h for in-kernel usage. 56 */ 57 58 struct cb_id { 59 __u32 idx; 60 __u32 val; 61 }; 62 63 struct cn_msg { 64 struct cb_id id; 65 66 __u32 seq; 67 __u32 ack; 68 69 __u16 len; /* Length of the following data */ 70 __u16 flags; 71 __u8 data[0]; 72 }; 73 74 /* 75 * Notify structure - requests notification about 76 * registering/unregistering idx/val in range [first, first+range]. 77 */ 78 struct cn_notify_req { 79 __u32 first; 80 __u32 range; 81 }; 82 83 /* 84 * Main notification control message 85 * *_notify_num - number of appropriate cn_notify_req structures after 86 * this struct. 87 * group - notification receiver's idx. 88 * len - total length of the attached data. 89 */ 90 struct cn_ctl_msg { 91 __u32 idx_notify_num; 92 __u32 val_notify_num; 93 __u32 group; 94 __u32 len; 95 __u8 data[0]; 96 }; 97 98 #ifdef __KERNEL__ 99 100 #include <asm/atomic.h> 101 102 #include <linux/list.h> 103 #include <linux/workqueue.h> 104 105 #include <net/sock.h> 106 107 #define CN_CBQ_NAMELEN 32 108 109 struct cn_queue_dev { 110 atomic_t refcnt; 111 unsigned char name[CN_CBQ_NAMELEN]; 112 113 struct workqueue_struct *cn_queue; 114 /* Sent to kevent to create cn_queue only when needed */ 115 struct work_struct wq_creation; 116 /* Tell if the wq_creation job is pending/completed */ 117 atomic_t wq_requested; 118 /* Wait for cn_queue to be created */ 119 wait_queue_head_t wq_created; 120 121 struct list_head queue_list; 122 spinlock_t queue_lock; 123 124 struct sock *nls; 125 }; 126 127 struct cn_callback_id { 128 unsigned char name[CN_CBQ_NAMELEN]; 129 struct cb_id id; 130 }; 131 132 struct cn_callback_data { 133 void (*destruct_data) (void *); 134 void *ddata; 135 136 void *callback_priv; 137 void (*callback) (void *); 138 139 void *free; 140 }; 141 142 struct cn_callback_entry { 143 struct list_head callback_entry; 144 struct work_struct work; 145 struct cn_queue_dev *pdev; 146 147 struct cn_callback_id id; 148 struct cn_callback_data data; 149 150 u32 seq, group; 151 }; 152 153 struct cn_ctl_entry { 154 struct list_head notify_entry; 155 struct cn_ctl_msg *msg; 156 }; 157 158 struct cn_dev { 159 struct cb_id id; 160 161 u32 seq, groups; 162 struct sock *nls; 163 void (*input) (struct sk_buff *skb); 164 165 struct cn_queue_dev *cbdev; 166 }; 167 168 int cn_add_callback(struct cb_id *, char *, void (*callback) (void *)); 169 void cn_del_callback(struct cb_id *); 170 int cn_netlink_send(struct cn_msg *, u32, gfp_t); 171 172 int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *)); 173 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); 174 175 int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work); 176 177 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *); 178 void cn_queue_free_dev(struct cn_queue_dev *dev); 179 180 int cn_cb_equal(struct cb_id *, struct cb_id *); 181 182 void cn_queue_wrapper(struct work_struct *work); 183 184 #endif /* __KERNEL__ */ 185 #endif /* __CONNECTOR_H */ 186