cregit-Linux how code gets into the kernel

Release 4.7 include/uapi/linux/phonet.h

/**
 * file phonet.h
 *
 * Phonet sockets kernel interface
 *
 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#ifndef _UAPILINUX_PHONET_H

#define _UAPILINUX_PHONET_H

#include <linux/types.h>
#include <linux/socket.h>

/* Automatic protocol selection */

#define PN_PROTO_TRANSPORT	0
/* Phonet datagram socket */

#define PN_PROTO_PHONET		1
/* Phonet pipe */

#define PN_PROTO_PIPE		2

#define PHONET_NPROTO		3

/* Socket options for SOL_PNPIPE level */

#define PNPIPE_ENCAP		1

#define PNPIPE_IFINDEX		2

#define PNPIPE_HANDLE		3

#define PNPIPE_INITSTATE	4


#define PNADDR_ANY		0

#define PNADDR_BROADCAST	0xFC

#define PNPORT_RESOURCE_ROUTING	0

/* Values for PNPIPE_ENCAP option */

#define PNPIPE_ENCAP_NONE	0

#define PNPIPE_ENCAP_IP		1

/* ioctls */

#define SIOCPNGETOBJECT		(SIOCPROTOPRIVATE + 0)

#define SIOCPNENABLEPIPE	(SIOCPROTOPRIVATE + 13)

#define SIOCPNADDRESOURCE	(SIOCPROTOPRIVATE + 14)

#define SIOCPNDELRESOURCE	(SIOCPROTOPRIVATE + 15)

/* Phonet protocol header */

struct phonethdr {
	
__u8	pn_rdev;
	
__u8	pn_sdev;
	
__u8	pn_res;
	
__be16	pn_length;
	
__u8	pn_robj;
	
__u8	pn_sobj;
} __attribute__((packed));

/* Common Phonet payload header */

struct phonetmsg {
	
__u8	pn_trans_id;	/* transaction ID */
	
__u8	pn_msg_id;	/* message type */
	union {
		struct {
			
__u8	pn_submsg_id;	/* message subtype */
			
__u8	pn_data[5];
		} 
base;
		struct {
			
__u16	pn_e_res_id;	/* extended resource ID */
			
__u8	pn_e_submsg_id;	/* message subtype */
			
__u8	pn_e_data[3];
		} 
ext;
	} 
pn_msg_u;
};

#define PN_COMMON_MESSAGE	0xF0

#define PN_COMMGR		0x10

#define PN_PREFIX		0xE0 
/* resource for extended messages */

#define pn_submsg_id		pn_msg_u.base.pn_submsg_id

#define pn_e_submsg_id		pn_msg_u.ext.pn_e_submsg_id

#define pn_e_res_id		pn_msg_u.ext.pn_e_res_id

#define pn_data			pn_msg_u.base.pn_data

#define pn_e_data		pn_msg_u.ext.pn_e_data

/* data for unreachable errors */

#define PN_COMM_SERVICE_NOT_IDENTIFIED_RESP	0x01

#define PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP	0x14

#define pn_orig_msg_id		pn_data[0]

#define pn_status		pn_data[1]

#define pn_e_orig_msg_id	pn_e_data[0]

#define pn_e_status		pn_e_data[1]

/* Phonet socket address structure */

struct sockaddr_pn {
	
__kernel_sa_family_t spn_family;
	
__u8 spn_obj;
	
__u8 spn_dev;
	
__u8 spn_resource;
	
__u8 spn_zero[sizeof(struct sockaddr) - sizeof(__kernel_sa_family_t) - 3];
} __attribute__((packed));

/* Well known address */

#define PN_DEV_PC	0x10


static inline __u16 pn_object(__u8 addr, __u16 port) { return (addr << 8) | (port & 0x3ff); }

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static inline __u8 pn_obj(__u16 handle) { return handle & 0xff; }

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static inline __u8 pn_dev(__u16 handle) { return handle >> 8; }

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static inline __u16 pn_port(__u16 handle) { return handle & 0x3ff; }

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static inline __u8 pn_addr(__u16 handle) { return (handle >> 8) & 0xfc; }

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static inline void pn_sockaddr_set_addr(struct sockaddr_pn *spn, __u8 addr) { spn->spn_dev &= 0x03; spn->spn_dev |= addr & 0xfc; }

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static inline void pn_sockaddr_set_port(struct sockaddr_pn *spn, __u16 port) { spn->spn_dev &= 0xfc; spn->spn_dev |= (port >> 8) & 0x03; spn->spn_obj = port & 0xff; }

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static inline void pn_sockaddr_set_object(struct sockaddr_pn *spn, __u16 handle) { spn->spn_dev = pn_dev(handle); spn->spn_obj = pn_obj(handle); }

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static inline void pn_sockaddr_set_resource(struct sockaddr_pn *spn, __u8 resource) { spn->spn_resource = resource; }

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static inline __u8 pn_sockaddr_get_addr(const struct sockaddr_pn *spn) { return spn->spn_dev & 0xfc; }

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static inline __u16 pn_sockaddr_get_port(const struct sockaddr_pn *spn) { return ((spn->spn_dev & 0x03) << 8) | spn->spn_obj; }

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static inline __u16 pn_sockaddr_get_object(const struct sockaddr_pn *spn) { return pn_object(spn->spn_dev, spn->spn_obj); }

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static inline __u8 pn_sockaddr_get_resource(const struct sockaddr_pn *spn) { return spn->spn_resource; }

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/* Phonet device ioctl requests */ #endif /* _UAPILINUX_PHONET_H */

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