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135 lines
3.8 KiB
135 lines
3.8 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* connector.h |
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* |
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* 2004-2005 Copyright (c) Evgeniy Polyakov <[email protected]> |
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* All rights reserved. |
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*/ |
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#ifndef __CONNECTOR_H |
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#define __CONNECTOR_H |
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#include <linux/refcount.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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#include <uapi/linux/connector.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 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_entry { |
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struct list_head callback_entry; |
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refcount_t refcnt; |
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struct cn_queue_dev *pdev; |
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struct cn_callback_id id; |
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void (*callback) (struct cn_msg *, struct netlink_skb_parms *); |
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u32 seq, group; |
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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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struct cn_queue_dev *cbdev; |
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}; |
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/** |
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* cn_add_callback() - Registers new callback with connector core. |
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* |
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* @id: unique connector's user identifier. |
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* It must be registered in connector.h for legal |
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* in-kernel users. |
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* @name: connector's callback symbolic name. |
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* @callback: connector's callback. |
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* parameters are %cn_msg and the sender's credentials |
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*/ |
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int cn_add_callback(const struct cb_id *id, const char *name, |
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void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); |
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/** |
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* cn_del_callback() - Unregisters new callback with connector core. |
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* |
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* @id: unique connector's user identifier. |
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*/ |
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void cn_del_callback(const struct cb_id *id); |
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/** |
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* cn_netlink_send_mult - Sends message to the specified groups. |
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* |
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* @msg: message header(with attached data). |
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* @len: Number of @msg to be sent. |
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* @portid: destination port. |
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* If non-zero the message will be sent to the given port, |
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* which should be set to the original sender. |
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* @group: destination group. |
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* If @portid and @group is zero, then appropriate group will |
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* be searched through all registered connector users, and |
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* message will be delivered to the group which was created |
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* for user with the same ID as in @msg. |
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* If @group is not zero, then message will be delivered |
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* to the specified group. |
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* @gfp_mask: GFP mask. |
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* |
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* It can be safely called from softirq context, but may silently |
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* fail under strong memory pressure. |
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* |
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* If there are no listeners for given group %-ESRCH can be returned. |
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*/ |
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int cn_netlink_send_mult(struct cn_msg *msg, u16 len, u32 portid, u32 group, gfp_t gfp_mask); |
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/** |
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* cn_netlink_send - Sends message to the specified groups. |
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* |
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* @msg: message header(with attached data). |
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* @portid: destination port. |
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* If non-zero the message will be sent to the given port, |
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* which should be set to the original sender. |
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* @group: destination group. |
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* If @portid and @group is zero, then appropriate group will |
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* be searched through all registered connector users, and |
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* message will be delivered to the group which was created |
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* for user with the same ID as in @msg. |
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* If @group is not zero, then message will be delivered |
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* to the specified group. |
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* @gfp_mask: GFP mask. |
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* |
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* It can be safely called from softirq context, but may silently |
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* fail under strong memory pressure. |
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* |
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* If there are no listeners for given group %-ESRCH can be returned. |
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*/ |
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int cn_netlink_send(struct cn_msg *msg, u32 portid, u32 group, gfp_t gfp_mask); |
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int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name, |
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const struct cb_id *id, |
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void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); |
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void cn_queue_del_callback(struct cn_queue_dev *dev, const struct cb_id *id); |
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void cn_queue_release_callback(struct cn_callback_entry *); |
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struct cn_queue_dev *cn_queue_alloc_dev(const 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(const struct cb_id *, const struct cb_id *); |
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#endif /* __CONNECTOR_H */
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