1 /* 2 * connector.h 3 * 4 * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru> 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 47 #define CN_NETLINK_USERS 9 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 #ifdef __KERNEL__ 77 78 #include <asm/atomic.h> 79 80 #include <linux/list.h> 81 #include <linux/workqueue.h> 82 83 #include <net/sock.h> 84 85 #define CN_CBQ_NAMELEN 32 86 87 struct cn_queue_dev { 88 atomic_t refcnt; 89 unsigned char name[CN_CBQ_NAMELEN]; 90 91 struct list_head queue_list; 92 spinlock_t queue_lock; 93 94 struct sock *nls; 95 }; 96 97 struct cn_callback_id { 98 unsigned char name[CN_CBQ_NAMELEN]; 99 struct cb_id id; 100 }; 101 102 struct cn_callback_entry { 103 struct list_head callback_entry; 104 atomic_t refcnt; 105 struct cn_queue_dev *pdev; 106 107 struct cn_callback_id id; 108 void (*callback) (struct cn_msg *, struct netlink_skb_parms *); 109 110 u32 seq, group; 111 }; 112 113 struct cn_dev { 114 struct cb_id id; 115 116 u32 seq, groups; 117 struct sock *nls; 118 void (*input) (struct sk_buff *skb); 119 120 struct cn_queue_dev *cbdev; 121 }; 122 123 int cn_add_callback(struct cb_id *id, const char *name, 124 void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); 125 void cn_del_callback(struct cb_id *); 126 int cn_netlink_send(struct cn_msg *, u32, gfp_t); 127 128 int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name, 129 struct cb_id *id, 130 void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); 131 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); 132 void cn_queue_release_callback(struct cn_callback_entry *); 133 134 struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *); 135 void cn_queue_free_dev(struct cn_queue_dev *dev); 136 137 int cn_cb_equal(struct cb_id *, struct cb_id *); 138 139 #endif /* __KERNEL__ */ 140 #endif /* __CONNECTOR_H */ 141