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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141/* SPDX-License-Identifier: GPL-2.0-or-later *//* * connector.h * * 2004-2005 Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> * All rights reserved. */#ifndef __CONNECTOR_H#define __CONNECTOR_H
#include <linux/refcount.h>
#include <linux/list.h>#include <linux/workqueue.h>
#include <net/sock.h>#include <uapi/linux/connector.h>
#define CN_CBQ_NAMELEN 32
struct cn_queue_dev { atomic_t refcnt; unsigned char name[CN_CBQ_NAMELEN];
struct list_head queue_list; spinlock_t queue_lock;
struct sock *nls;};
struct cn_callback_id { unsigned char name[CN_CBQ_NAMELEN]; struct cb_id id;};
struct cn_callback_entry { struct list_head callback_entry; refcount_t refcnt; struct cn_queue_dev *pdev;
struct cn_callback_id id; void (*callback) (struct cn_msg *, struct netlink_skb_parms *);
u32 seq, group;};
struct cn_dev { struct cb_id id;
u32 seq, groups; struct sock *nls;
struct cn_queue_dev *cbdev;};
/** * cn_add_callback() - Registers new callback with connector core. * * @id: unique connector's user identifier. * It must be registered in connector.h for legal * in-kernel users. * @name: connector's callback symbolic name. * @callback: connector's callback. * parameters are %cn_msg and the sender's credentials */int cn_add_callback(const struct cb_id *id, const char *name, void (*callback)(struct cn_msg *, struct netlink_skb_parms *));/** * cn_del_callback() - Unregisters new callback with connector core. * * @id: unique connector's user identifier. */void cn_del_callback(const struct cb_id *id);
/** * cn_netlink_send_mult - Sends message to the specified groups. * * @msg: message header(with attached data). * @len: Number of @msg to be sent. * @portid: destination port. * If non-zero the message will be sent to the given port, * which should be set to the original sender. * @group: destination group. * If @portid and @group is zero, then appropriate group will * be searched through all registered connector users, and * message will be delivered to the group which was created * for user with the same ID as in @msg. * If @group is not zero, then message will be delivered * to the specified group. * @gfp_mask: GFP mask. * @filter: Filter function to be used at netlink layer. * @filter_data:Filter data to be supplied to the filter function * * It can be safely called from softirq context, but may silently * fail under strong memory pressure. * * If there are no listeners for given group %-ESRCH can be returned. */int cn_netlink_send_mult(struct cn_msg *msg, u16 len, u32 portid, u32 group, gfp_t gfp_mask, netlink_filter_fn filter, void *filter_data);
/** * cn_netlink_send - Sends message to the specified groups. * * @msg: message header(with attached data). * @portid: destination port. * If non-zero the message will be sent to the given port, * which should be set to the original sender. * @group: destination group. * If @portid and @group is zero, then appropriate group will * be searched through all registered connector users, and * message will be delivered to the group which was created * for user with the same ID as in @msg. * If @group is not zero, then message will be delivered * to the specified group. * @gfp_mask: GFP mask. * * It can be safely called from softirq context, but may silently * fail under strong memory pressure. * * If there are no listeners for given group %-ESRCH can be returned. */int cn_netlink_send(struct cn_msg *msg, u32 portid, u32 group, gfp_t gfp_mask);
int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name, const struct cb_id *id, void (*callback)(struct cn_msg *, struct netlink_skb_parms *));void cn_queue_del_callback(struct cn_queue_dev *dev, const struct cb_id *id);void cn_queue_release_callback(struct cn_callback_entry *);
struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *);void cn_queue_free_dev(struct cn_queue_dev *dev);
int cn_cb_equal(const struct cb_id *, const struct cb_id *);
#endif /* __CONNECTOR_H */