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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 #ifndef __CONNECTOR_H
22 #define __CONNECTOR_H
23 
24 
25 #include <linux/atomic.h>
26 
27 #include <linux/list.h>
28 #include <linux/workqueue.h>
29 
30 #include <net/sock.h>
31 #include <uapi/linux/connector.h>
32 
33 #define CN_CBQ_NAMELEN		32
34 
35 struct cn_queue_dev {
36 	atomic_t refcnt;
37 	unsigned char name[CN_CBQ_NAMELEN];
38 
39 	struct list_head queue_list;
40 	spinlock_t queue_lock;
41 
42 	struct sock *nls;
43 };
44 
45 struct cn_callback_id {
46 	unsigned char name[CN_CBQ_NAMELEN];
47 	struct cb_id id;
48 };
49 
50 struct cn_callback_entry {
51 	struct list_head callback_entry;
52 	atomic_t refcnt;
53 	struct cn_queue_dev *pdev;
54 
55 	struct cn_callback_id id;
56 	void (*callback) (struct cn_msg *, struct netlink_skb_parms *);
57 
58 	u32 seq, group;
59 };
60 
61 struct cn_dev {
62 	struct cb_id id;
63 
64 	u32 seq, groups;
65 	struct sock *nls;
66 	void (*input) (struct sk_buff *skb);
67 
68 	struct cn_queue_dev *cbdev;
69 };
70 
71 int cn_add_callback(struct cb_id *id, const char *name,
72 		    void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
73 void cn_del_callback(struct cb_id *);
74 int cn_netlink_send_mult(struct cn_msg *msg, u16 len, u32 portid, u32 group, gfp_t gfp_mask);
75 int cn_netlink_send(struct cn_msg *msg, u32 portid, u32 group, gfp_t gfp_mask);
76 
77 int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name,
78 			  struct cb_id *id,
79 			  void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
80 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
81 void cn_queue_release_callback(struct cn_callback_entry *);
82 
83 struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *);
84 void cn_queue_free_dev(struct cn_queue_dev *dev);
85 
86 int cn_cb_equal(struct cb_id *, struct cb_id *);
87 
88 #endif				/* __CONNECTOR_H */
89