1 /* 2 * connector.h 3 * 4 * 2004-2005 Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> 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 /* 28 * Process Events connector unique ids -- used for message routing 29 */ 30 #define CN_IDX_PROC 0x1 31 #define CN_VAL_PROC 0x1 32 #define CN_IDX_CIFS 0x2 33 #define CN_VAL_CIFS 0x1 34 #define CN_W1_IDX 0x3 /* w1 communication */ 35 #define CN_W1_VAL 0x1 36 #define CN_IDX_V86D 0x4 37 #define CN_VAL_V86D_UVESAFB 0x1 38 #define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */ 39 #define CN_DST_IDX 0x6 40 #define CN_DST_VAL 0x1 41 #define CN_IDX_DM 0x7 /* Device Mapper */ 42 #define CN_VAL_DM_USERSPACE_LOG 0x1 43 #define CN_IDX_DRBD 0x8 44 #define CN_VAL_DRBD 0x1 45 #define CN_KVP_IDX 0x9 /* HyperV KVP */ 46 #define CN_KVP_VAL 0x1 /* queries from the kernel */ 47 48 #define CN_NETLINK_USERS 10 /* Highest index + 1 */ 49 50 /* 51 * Maximum connector's message size. 52 */ 53 #define CONNECTOR_MAX_MSG_SIZE 16384 54 55 /* 56 * idx and val are unique identifiers which 57 * are used for message routing and 58 * must be registered in connector.h for in-kernel usage. 59 */ 60 61 struct cb_id { 62 __u32 idx; 63 __u32 val; 64 }; 65 66 struct cn_msg { 67 struct cb_id id; 68 69 __u32 seq; 70 __u32 ack; 71 72 __u16 len; /* Length of the following data */ 73 __u16 flags; 74 __u8 data[0]; 75 }; 76 77 #ifdef __KERNEL__ 78 79 #include <linux/atomic.h> 80 81 #include <linux/list.h> 82 #include <linux/workqueue.h> 83 84 #include <net/sock.h> 85 86 #define CN_CBQ_NAMELEN 32 87 88 struct cn_queue_dev { 89 atomic_t refcnt; 90 unsigned char name[CN_CBQ_NAMELEN]; 91 92 struct list_head queue_list; 93 spinlock_t queue_lock; 94 95 struct sock *nls; 96 }; 97 98 struct cn_callback_id { 99 unsigned char name[CN_CBQ_NAMELEN]; 100 struct cb_id id; 101 }; 102 103 struct cn_callback_entry { 104 struct list_head callback_entry; 105 atomic_t refcnt; 106 struct cn_queue_dev *pdev; 107 108 struct cn_callback_id id; 109 void (*callback) (struct cn_msg *, struct netlink_skb_parms *); 110 111 u32 seq, group; 112 }; 113 114 struct cn_dev { 115 struct cb_id id; 116 117 u32 seq, groups; 118 struct sock *nls; 119 void (*input) (struct sk_buff *skb); 120 121 struct cn_queue_dev *cbdev; 122 }; 123 124 int cn_add_callback(struct cb_id *id, const char *name, 125 void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); 126 void cn_del_callback(struct cb_id *); 127 int cn_netlink_send(struct cn_msg *, u32, gfp_t); 128 129 int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name, 130 struct cb_id *id, 131 void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); 132 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); 133 void cn_queue_release_callback(struct cn_callback_entry *); 134 135 struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *); 136 void cn_queue_free_dev(struct cn_queue_dev *dev); 137 138 int cn_cb_equal(struct cb_id *, struct cb_id *); 139 140 #endif /* __KERNEL__ */ 141 #endif /* __CONNECTOR_H */ 142