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 #define CN_IDX_DRBD 0x8 47 #define CN_VAL_DRBD 0x1 48 49 #define CN_NETLINK_USERS 8 50 51 /* 52 * Maximum connector's message size. 53 */ 54 #define CONNECTOR_MAX_MSG_SIZE 16384 55 56 /* 57 * idx and val are unique identifiers which 58 * are used for message routing and 59 * must be registered in connector.h for in-kernel usage. 60 */ 61 62 struct cb_id { 63 __u32 idx; 64 __u32 val; 65 }; 66 67 struct cn_msg { 68 struct cb_id id; 69 70 __u32 seq; 71 __u32 ack; 72 73 __u16 len; /* Length of the following data */ 74 __u16 flags; 75 __u8 data[0]; 76 }; 77 78 /* 79 * Notify structure - requests notification about 80 * registering/unregistering idx/val in range [first, first+range]. 81 */ 82 struct cn_notify_req { 83 __u32 first; 84 __u32 range; 85 }; 86 87 /* 88 * Main notification control message 89 * *_notify_num - number of appropriate cn_notify_req structures after 90 * this struct. 91 * group - notification receiver's idx. 92 * len - total length of the attached data. 93 */ 94 struct cn_ctl_msg { 95 __u32 idx_notify_num; 96 __u32 val_notify_num; 97 __u32 group; 98 __u32 len; 99 __u8 data[0]; 100 }; 101 102 #ifdef __KERNEL__ 103 104 #include <asm/atomic.h> 105 106 #include <linux/list.h> 107 #include <linux/workqueue.h> 108 109 #include <net/sock.h> 110 111 #define CN_CBQ_NAMELEN 32 112 113 struct cn_queue_dev { 114 atomic_t refcnt; 115 unsigned char name[CN_CBQ_NAMELEN]; 116 117 struct workqueue_struct *cn_queue; 118 /* Sent to kevent to create cn_queue only when needed */ 119 struct work_struct wq_creation; 120 /* Tell if the wq_creation job is pending/completed */ 121 atomic_t wq_requested; 122 /* Wait for cn_queue to be created */ 123 wait_queue_head_t wq_created; 124 125 struct list_head queue_list; 126 spinlock_t queue_lock; 127 128 struct sock *nls; 129 }; 130 131 struct cn_callback_id { 132 unsigned char name[CN_CBQ_NAMELEN]; 133 struct cb_id id; 134 }; 135 136 struct cn_callback_data { 137 struct sk_buff *skb; 138 void (*callback) (struct cn_msg *, struct netlink_skb_parms *); 139 140 void *free; 141 }; 142 143 struct cn_callback_entry { 144 struct list_head callback_entry; 145 struct work_struct work; 146 struct cn_queue_dev *pdev; 147 148 struct cn_callback_id id; 149 struct cn_callback_data data; 150 151 u32 seq, group; 152 }; 153 154 struct cn_ctl_entry { 155 struct list_head notify_entry; 156 struct cn_ctl_msg *msg; 157 }; 158 159 struct cn_dev { 160 struct cb_id id; 161 162 u32 seq, groups; 163 struct sock *nls; 164 void (*input) (struct sk_buff *skb); 165 166 struct cn_queue_dev *cbdev; 167 }; 168 169 int cn_add_callback(struct cb_id *, char *, void (*callback) (struct cn_msg *, struct netlink_skb_parms *)); 170 void cn_del_callback(struct cb_id *); 171 int cn_netlink_send(struct cn_msg *, u32, gfp_t); 172 173 int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); 174 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); 175 176 int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work); 177 178 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *); 179 void cn_queue_free_dev(struct cn_queue_dev *dev); 180 181 int cn_cb_equal(struct cb_id *, struct cb_id *); 182 183 void cn_queue_wrapper(struct work_struct *work); 184 185 #endif /* __KERNEL__ */ 186 #endif /* __CONNECTOR_H */ 187