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 46#define CN_NETLINK_USERS 8 47 48/* 49 * Maximum connector's message size. 50 */ 51#define CONNECTOR_MAX_MSG_SIZE 16384 52 53/* 54 * idx and val are unique identifiers which 55 * are used for message routing and 56 * must be registered in connector.h for in-kernel usage. 57 */ 58 59struct cb_id { 60 __u32 idx; 61 __u32 val; 62}; 63 64struct cn_msg { 65 struct cb_id id; 66 67 __u32 seq; 68 __u32 ack; 69 70 __u16 len; /* Length of the following data */ 71 __u16 flags; 72 __u8 data[0]; 73}; 74 75#ifdef __KERNEL__ 76 77#include <asm/atomic.h> 78 79#include <linux/list.h> 80#include <linux/workqueue.h> 81 82#include <net/sock.h> 83 84#define CN_CBQ_NAMELEN 32 85 86struct cn_queue_dev { 87 atomic_t refcnt; 88 unsigned char name[CN_CBQ_NAMELEN]; 89 90 struct workqueue_struct *cn_queue; 91 /* Sent to kevent to create cn_queue only when needed */ 92 struct work_struct wq_creation; 93 /* Tell if the wq_creation job is pending/completed */ 94 atomic_t wq_requested; 95 /* Wait for cn_queue to be created */ 96 wait_queue_head_t wq_created; 97 98 struct list_head queue_list; 99 spinlock_t queue_lock; 100 101 struct sock *nls; 102}; 103 104struct cn_callback_id { 105 unsigned char name[CN_CBQ_NAMELEN]; 106 struct cb_id id; 107}; 108 109struct cn_callback_data { 110 struct sk_buff *skb; 111 void (*callback) (struct cn_msg *, struct netlink_skb_parms *); 112 113 void *free; 114}; 115 116struct cn_callback_entry { 117 struct list_head callback_entry; 118 struct work_struct work; 119 struct cn_queue_dev *pdev; 120 121 struct cn_callback_id id; 122 struct cn_callback_data data; 123 124 u32 seq, group; 125}; 126 127struct cn_dev { 128 struct cb_id id; 129 130 u32 seq, groups; 131 struct sock *nls; 132 void (*input) (struct sk_buff *skb); 133 134 struct cn_queue_dev *cbdev; 135}; 136 137int cn_add_callback(struct cb_id *, char *, void (*callback) (struct cn_msg *, struct netlink_skb_parms *)); 138void cn_del_callback(struct cb_id *); 139int cn_netlink_send(struct cn_msg *, u32, gfp_t); 140 141int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); 142void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); 143 144int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work); 145 146struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *); 147void cn_queue_free_dev(struct cn_queue_dev *dev); 148 149int cn_cb_equal(struct cb_id *, struct cb_id *); 150 151void cn_queue_wrapper(struct work_struct *work); 152 153#endif /* __KERNEL__ */ 154#endif /* __CONNECTOR_H */ 155