0741241c6b
The connector documentation states that the argument to the callback function is always a pointer to a struct cn_msg, but rather than encode it in the API itself, it uses a void pointer everywhere. This doesn't make much sense to encode the pointer in documentation as it prevents proper C type checking from occurring and can easily allow people to use the wrong pointer type. So convert the argument type to an explicit struct cn_msg pointer. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: David S. Miller <davem@davemloft.net>
188 lines
4.3 KiB
C
188 lines
4.3 KiB
C
/*
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* connector.h
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*
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* 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __CONNECTOR_H
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#define __CONNECTOR_H
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#include <linux/types.h>
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#define CN_IDX_CONNECTOR 0xffffffff
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#define CN_VAL_CONNECTOR 0xffffffff
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/*
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* Process Events connector unique ids -- used for message routing
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*/
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#define CN_IDX_PROC 0x1
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#define CN_VAL_PROC 0x1
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#define CN_IDX_CIFS 0x2
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#define CN_VAL_CIFS 0x1
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#define CN_W1_IDX 0x3 /* w1 communication */
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#define CN_W1_VAL 0x1
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#define CN_IDX_V86D 0x4
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#define CN_VAL_V86D_UVESAFB 0x1
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#define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */
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#define CN_DST_IDX 0x6
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#define CN_DST_VAL 0x1
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#define CN_IDX_DM 0x7 /* Device Mapper */
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#define CN_VAL_DM_USERSPACE_LOG 0x1
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#define CN_NETLINK_USERS 8
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/*
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* Maximum connector's message size.
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*/
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#define CONNECTOR_MAX_MSG_SIZE 16384
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/*
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* idx and val are unique identifiers which
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* are used for message routing and
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* must be registered in connector.h for in-kernel usage.
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*/
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struct cb_id {
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__u32 idx;
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__u32 val;
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};
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struct cn_msg {
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struct cb_id id;
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__u32 seq;
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__u32 ack;
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__u16 len; /* Length of the following data */
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__u16 flags;
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__u8 data[0];
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};
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/*
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* Notify structure - requests notification about
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* registering/unregistering idx/val in range [first, first+range].
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*/
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struct cn_notify_req {
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__u32 first;
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__u32 range;
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};
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/*
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* Main notification control message
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* *_notify_num - number of appropriate cn_notify_req structures after
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* this struct.
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* group - notification receiver's idx.
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* len - total length of the attached data.
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*/
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struct cn_ctl_msg {
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__u32 idx_notify_num;
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__u32 val_notify_num;
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__u32 group;
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__u32 len;
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__u8 data[0];
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};
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#ifdef __KERNEL__
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#include <asm/atomic.h>
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#include <linux/list.h>
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#include <linux/workqueue.h>
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#include <net/sock.h>
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#define CN_CBQ_NAMELEN 32
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struct cn_queue_dev {
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atomic_t refcnt;
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unsigned char name[CN_CBQ_NAMELEN];
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struct workqueue_struct *cn_queue;
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/* Sent to kevent to create cn_queue only when needed */
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struct work_struct wq_creation;
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/* Tell if the wq_creation job is pending/completed */
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atomic_t wq_requested;
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/* Wait for cn_queue to be created */
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wait_queue_head_t wq_created;
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struct list_head queue_list;
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spinlock_t queue_lock;
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struct sock *nls;
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};
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struct cn_callback_id {
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unsigned char name[CN_CBQ_NAMELEN];
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struct cb_id id;
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};
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struct cn_callback_data {
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void (*destruct_data) (void *);
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void *ddata;
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void *callback_priv;
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void (*callback) (struct cn_msg *);
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void *free;
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};
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struct cn_callback_entry {
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struct list_head callback_entry;
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struct work_struct work;
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struct cn_queue_dev *pdev;
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struct cn_callback_id id;
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struct cn_callback_data data;
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u32 seq, group;
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};
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struct cn_ctl_entry {
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struct list_head notify_entry;
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struct cn_ctl_msg *msg;
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};
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struct cn_dev {
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struct cb_id id;
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u32 seq, groups;
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struct sock *nls;
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void (*input) (struct sk_buff *skb);
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struct cn_queue_dev *cbdev;
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};
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int cn_add_callback(struct cb_id *, char *, void (*callback) (struct cn_msg *));
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void cn_del_callback(struct cb_id *);
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int cn_netlink_send(struct cn_msg *, u32, gfp_t);
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int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(struct cn_msg *));
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void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
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int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work);
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struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
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void cn_queue_free_dev(struct cn_queue_dev *dev);
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int cn_cb_equal(struct cb_id *, struct cb_id *);
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void cn_queue_wrapper(struct work_struct *work);
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#endif /* __KERNEL__ */
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#endif /* __CONNECTOR_H */
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