include/linux/netlink.h - kernel/msm-4.9 - Gitiles

 #ifndef __LINUX_NETLINK_H
 #define __LINUX_NETLINK_H

 #include <linux/socket.h> /* for sa_family_t */
 #include <linux/types.h>

 #define NETLINK_ROUTE		0	/* Routing/device hook				*/
 #define NETLINK_UNUSED		1	/* Unused number				*/
 #define NETLINK_USERSOCK	2	/* Reserved for user mode socket protocols 	*/
 #define NETLINK_FIREWALL	3	/* Firewalling hook				*/
 #define NETLINK_INET_DIAG	4	/* INET socket monitoring			*/
 #define NETLINK_NFLOG		5	/* netfilter/iptables ULOG */
 #define NETLINK_XFRM		6	/* ipsec */
 #define NETLINK_SELINUX		7	/* SELinux event notifications */
 #define NETLINK_ISCSI		8	/* Open-iSCSI */
 #define NETLINK_AUDIT		9	/* auditing */
 #define NETLINK_FIB_LOOKUP	10
 #define NETLINK_CONNECTOR	11
 #define NETLINK_NETFILTER	12	/* netfilter subsystem */
 #define NETLINK_IP6_FW		13
 #define NETLINK_DNRTMSG		14	/* DECnet routing messages */
 #define NETLINK_KOBJECT_UEVENT	15	/* Kernel messages to userspace */
 #define NETLINK_GENERIC		16
 /* leave room for NETLINK_DM (DM Events) */
 #define NETLINK_SCSITRANSPORT	18	/* SCSI Transports */
 #define NETLINK_ECRYPTFS	19

 #define MAX_LINKS 32

 struct net;

 struct sockaddr_nl
 {
 	sa_family_t	nl_family;	/* AF_NETLINK	*/
 	unsigned short	nl_pad;		/* zero		*/
 	__u32		nl_pid;		/* port ID	*/
        	__u32		nl_groups;	/* multicast groups mask */
 };

 struct nlmsghdr
 {
 	__u32		nlmsg_len;	/* Length of message including header */
 	__u16		nlmsg_type;	/* Message content */
 	__u16		nlmsg_flags;	/* Additional flags */
 	__u32		nlmsg_seq;	/* Sequence number */
 	__u32		nlmsg_pid;	/* Sending process port ID */
 };

 /* Flags values */

 #define NLM_F_REQUEST		1	/* It is request message. 	*/
 #define NLM_F_MULTI		2	/* Multipart message, terminated by NLMSG_DONE */
 #define NLM_F_ACK		4	/* Reply with ack, with zero or error code */
 #define NLM_F_ECHO		8	/* Echo this request 		*/

 /* Modifiers to GET request */
 #define NLM_F_ROOT	0x100	/* specify tree	root	*/
 #define NLM_F_MATCH	0x200	/* return all matching	*/
 #define NLM_F_ATOMIC	0x400	/* atomic GET		*/
 #define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)

 /* Modifiers to NEW request */
 #define NLM_F_REPLACE	0x100	/* Override existing		*/
 #define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
 #define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
 #define NLM_F_APPEND	0x800	/* Add to end of list		*/

 /*
    4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
    4.4BSD CHANGE	NLM_F_REPLACE

    True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
    Append		NLM_F_CREATE
    Check		NLM_F_EXCL
  */

 #define NLMSG_ALIGNTO	4
 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
 #define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
 #define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
 #define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
 				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
 			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
 			   (nlh)->nlmsg_len <= (len))
 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))

 #define NLMSG_NOOP		0x1	/* Nothing.		*/
 #define NLMSG_ERROR		0x2	/* Error		*/
 #define NLMSG_DONE		0x3	/* End of a dump	*/
 #define NLMSG_OVERRUN		0x4	/* Data lost		*/

 #define NLMSG_MIN_TYPE		0x10	/* < 0x10: reserved control messages */

 struct nlmsgerr
 {
 	int		error;
 	struct nlmsghdr msg;
 };

 #define NETLINK_ADD_MEMBERSHIP	1
 #define NETLINK_DROP_MEMBERSHIP	2
 #define NETLINK_PKTINFO		3
 #define NETLINK_BROADCAST_ERROR	4
 #define NETLINK_NO_ENOBUFS	5

 struct nl_pktinfo
 {
 	__u32	group;
 };

 #define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/

 enum {
 	NETLINK_UNCONNECTED = 0,
 	NETLINK_CONNECTED,
 };

 /*
  *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
  * +---------------------+- - -+- - - - - - - - - -+- - -+
  * |        Header       | Pad |     Payload       | Pad |
  * |   (struct nlattr)   | ing |                   | ing |
  * +---------------------+- - -+- - - - - - - - - -+- - -+
  *  <-------------- nlattr->nla_len -------------->
  */

 struct nlattr
 {
 	__u16           nla_len;
 	__u16           nla_type;
 };

 /*
  * nla_type (16 bits)
  * +---+---+-------------------------------+
  * | N | O | Attribute Type                |
  * +---+---+-------------------------------+
  * N := Carries nested attributes
  * O := Payload stored in network byte order
  *
  * Note: The N and O flag are mutually exclusive.
  */
 #define NLA_F_NESTED		(1 << 15)
 #define NLA_F_NET_BYTEORDER	(1 << 14)
 #define NLA_TYPE_MASK		~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)

 #define NLA_ALIGNTO		4
 #define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
 #define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))

 #ifdef __KERNEL__

 #include <linux/capability.h>
 #include <linux/skbuff.h>

 static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
 {
 	return (struct nlmsghdr *)skb->data;
 }

 struct netlink_skb_parms
 {
 	struct ucred		creds;		/* Skb credentials	*/
 	__u32			pid;
 	__u32			dst_group;
 	kernel_cap_t		eff_cap;
 	__u32			loginuid;	/* Login (audit) uid */
 	__u32			sessionid;	/* Session id (audit) */
 	__u32			sid;		/* SELinux security id */
 };

 #define NETLINK_CB(skb)		(*(struct netlink_skb_parms*)&((skb)->cb))
 #define NETLINK_CREDS(skb)	(&NETLINK_CB((skb)).creds)


 extern void netlink_table_grab(void);
 extern void netlink_table_ungrab(void);

 extern struct sock *netlink_kernel_create(struct net *net,
 					  int unit,unsigned int groups,
 					  void (*input)(struct sk_buff *skb),
 					  struct mutex *cb_mutex,
 					  struct module *module);
 extern void netlink_kernel_release(struct sock *sk);
 extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
 extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
 extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group);
 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
 extern int netlink_has_listeners(struct sock *sk, unsigned int group);
 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
 			     __u32 group, gfp_t allocation);
 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
 extern int netlink_register_notifier(struct notifier_block *nb);
 extern int netlink_unregister_notifier(struct notifier_block *nb);

 /* finegrained unicast helpers: */
 struct sock *netlink_getsockbyfilp(struct file *filp);
 int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
 		      long *timeo, struct sock *ssk);
 void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
 int netlink_sendskb(struct sock *sk, struct sk_buff *skb);

 /*
  *	skb should fit one page. This choice is good for headerless malloc.
  *	But we should limit to 8K so that userspace does not have to
  *	use enormous buffer sizes on recvmsg() calls just to avoid
  *	MSG_TRUNC when PAGE_SIZE is very large.
  */
 #if PAGE_SIZE < 8192UL
 #define NLMSG_GOODSIZE	SKB_WITH_OVERHEAD(PAGE_SIZE)
 #else
 #define NLMSG_GOODSIZE	SKB_WITH_OVERHEAD(8192UL)
 #endif

 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)


 struct netlink_callback
 {
 	struct sk_buff		*skb;
 	const struct nlmsghdr	*nlh;
 	int			(*dump)(struct sk_buff * skb,
 					struct netlink_callback *cb);
 	int			(*done)(struct netlink_callback *cb);
 	int			family;
 	long			args[6];
 };

 struct netlink_notify
 {
 	struct net *net;
 	int pid;
 	int protocol;
 };

 static __inline__ struct nlmsghdr *
 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
 {
 	struct nlmsghdr *nlh;
 	int size = NLMSG_LENGTH(len);

 	nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
 	nlh->nlmsg_type = type;
 	nlh->nlmsg_len = size;
 	nlh->nlmsg_flags = flags;
 	nlh->nlmsg_pid = pid;
 	nlh->nlmsg_seq = seq;
 	if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0)
 		memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
 	return nlh;
 }

 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \
 ({	if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \
 		goto nlmsg_failure; \
 	__nlmsg_put(skb, pid, seq, type, len, flags); })

 #define NLMSG_PUT(skb, pid, seq, type, len) \
 	NLMSG_NEW(skb, pid, seq, type, len, 0)

 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
 			      const struct nlmsghdr *nlh,
 			      int (*dump)(struct sk_buff *skb, struct netlink_callback*),
 			      int (*done)(struct netlink_callback*));


 #define NL_NONROOT_RECV 0x1
 #define NL_NONROOT_SEND 0x2
 extern void netlink_set_nonroot(int protocol, unsigned flag);

 #endif /* __KERNEL__ */

 #endif	/* __LINUX_NETLINK_H */
	#ifndef __LINUX_NETLINK_H
	#define __LINUX_NETLINK_H

	#include <linux/socket.h> /* for sa_family_t */
	#include <linux/types.h>

	#define NETLINK_ROUTE 0 /* Routing/device hook */
	#define NETLINK_UNUSED 1 /* Unused number */
	#define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
	#define NETLINK_FIREWALL 3 /* Firewalling hook */
	#define NETLINK_INET_DIAG 4 /* INET socket monitoring */
	#define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */
	#define NETLINK_XFRM 6 /* ipsec */
	#define NETLINK_SELINUX 7 /* SELinux event notifications */
	#define NETLINK_ISCSI 8 /* Open-iSCSI */
	#define NETLINK_AUDIT 9 /* auditing */
	#define NETLINK_FIB_LOOKUP 10
	#define NETLINK_CONNECTOR 11
	#define NETLINK_NETFILTER 12 /* netfilter subsystem */
	#define NETLINK_IP6_FW 13
	#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
	#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
	#define NETLINK_GENERIC 16
	/* leave room for NETLINK_DM (DM Events) */
	#define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */
	#define NETLINK_ECRYPTFS 19

	#define MAX_LINKS 32

	struct net;

	struct sockaddr_nl
	{
	sa_family_t nl_family; /* AF_NETLINK */
	unsigned short nl_pad; /* zero */
	__u32 nl_pid; /* port ID */
	__u32 nl_groups; /* multicast groups mask */
	};

	struct nlmsghdr
	{
	__u32 nlmsg_len; /* Length of message including header */
	__u16 nlmsg_type; /* Message content */
	__u16 nlmsg_flags; /* Additional flags */
	__u32 nlmsg_seq; /* Sequence number */
	__u32 nlmsg_pid; /* Sending process port ID */
	};

	/* Flags values */

	#define NLM_F_REQUEST 1 /* It is request message. */
	#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
	#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
	#define NLM_F_ECHO 8 /* Echo this request */

	/* Modifiers to GET request */
	#define NLM_F_ROOT 0x100 /* specify tree root */
	#define NLM_F_MATCH 0x200 /* return all matching */
	#define NLM_F_ATOMIC 0x400 /* atomic GET */
	#define NLM_F_DUMP (NLM_F_ROOT\|NLM_F_MATCH)

	/* Modifiers to NEW request */
	#define NLM_F_REPLACE 0x100 /* Override existing */
	#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
	#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
	#define NLM_F_APPEND 0x800 /* Add to end of list */

	/*
	4.4BSD ADD NLM_F_CREATE\|NLM_F_EXCL
	4.4BSD CHANGE NLM_F_REPLACE

	True CHANGE NLM_F_CREATE\|NLM_F_REPLACE
	Append NLM_F_CREATE
	Check NLM_F_EXCL
	*/

	#define NLMSG_ALIGNTO 4
	#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
	#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
	#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
	#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
	#define NLMSG_DATA(nlh) ((void)(((char)nlh) + NLMSG_LENGTH(0)))
	#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
	(struct nlmsghdr)(((char)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
	#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
	(nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
	(nlh)->nlmsg_len <= (len))
	#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))

	#define NLMSG_NOOP 0x1 /* Nothing. */
	#define NLMSG_ERROR 0x2 /* Error */
	#define NLMSG_DONE 0x3 /* End of a dump */
	#define NLMSG_OVERRUN 0x4 /* Data lost */

	#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */

	struct nlmsgerr
	{
	int error;
	struct nlmsghdr msg;
	};

	#define NETLINK_ADD_MEMBERSHIP 1
	#define NETLINK_DROP_MEMBERSHIP 2
	#define NETLINK_PKTINFO 3
	#define NETLINK_BROADCAST_ERROR 4
	#define NETLINK_NO_ENOBUFS 5

	struct nl_pktinfo
	{
	__u32 group;
	};

	#define NET_MAJOR 36 /* Major 36 is reserved for networking */

	enum {
	NETLINK_UNCONNECTED = 0,
	NETLINK_CONNECTED,
	};

	/*
	* <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
	* +---------------------+- - -+- - - - - - - - - -+- - -+
	* \| Header \| Pad \| Payload \| Pad \|
	* \| (struct nlattr) \| ing \| \| ing \|
	* +---------------------+- - -+- - - - - - - - - -+- - -+
	* <-------------- nlattr->nla_len -------------->
	*/

	struct nlattr
	{
	__u16 nla_len;
	__u16 nla_type;
	};

	/*
	* nla_type (16 bits)
	* +---+---+-------------------------------+
	* \| N \| O \| Attribute Type \|
	* +---+---+-------------------------------+
	* N := Carries nested attributes
	* O := Payload stored in network byte order
	*
	* Note: The N and O flag are mutually exclusive.
	*/
	#define NLA_F_NESTED (1 << 15)
	#define NLA_F_NET_BYTEORDER (1 << 14)
	#define NLA_TYPE_MASK ~(NLA_F_NESTED \| NLA_F_NET_BYTEORDER)

	#define NLA_ALIGNTO 4
	#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
	#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))

	#ifdef __KERNEL__

	#include <linux/capability.h>
	#include <linux/skbuff.h>

	static inline struct nlmsghdr nlmsg_hdr(const struct sk_buff skb)
	{
	return (struct nlmsghdr *)skb->data;
	}

	struct netlink_skb_parms
	{
	struct ucred creds; /* Skb credentials */
	__u32 pid;
	__u32 dst_group;
	kernel_cap_t eff_cap;
	__u32 loginuid; /* Login (audit) uid */
	__u32 sessionid; /* Session id (audit) */
	__u32 sid; /* SELinux security id */
	};

	#define NETLINK_CB(skb) ((struct netlink_skb_parms)&((skb)->cb))
	#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)


	extern void netlink_table_grab(void);
	extern void netlink_table_ungrab(void);

	extern struct sock netlink_kernel_create(struct net net,
	int unit,unsigned int groups,
	void (input)(struct sk_buff skb),
	struct mutex *cb_mutex,
	struct module *module);
	extern void netlink_kernel_release(struct sock *sk);
	extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
	extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
	extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group);
	extern void netlink_ack(struct sk_buff in_skb, struct nlmsghdr nlh, int err);
	extern int netlink_has_listeners(struct sock *sk, unsigned int group);
	extern int netlink_unicast(struct sock ssk, struct sk_buff skb, __u32 pid, int nonblock);
	extern int netlink_broadcast(struct sock ssk, struct sk_buff skb, __u32 pid,
	__u32 group, gfp_t allocation);
	extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
	extern int netlink_register_notifier(struct notifier_block *nb);
	extern int netlink_unregister_notifier(struct notifier_block *nb);

	/* finegrained unicast helpers: */
	struct sock netlink_getsockbyfilp(struct file filp);
	int netlink_attachskb(struct sock sk, struct sk_buff skb,
	long timeo, struct sock ssk);
	void netlink_detachskb(struct sock sk, struct sk_buff skb);
	int netlink_sendskb(struct sock sk, struct sk_buff skb);

	/*
	* skb should fit one page. This choice is good for headerless malloc.
	* But we should limit to 8K so that userspace does not have to
	* use enormous buffer sizes on recvmsg() calls just to avoid
	* MSG_TRUNC when PAGE_SIZE is very large.
	*/
	#if PAGE_SIZE < 8192UL
	#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
	#else
	#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
	#endif

	#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)


	struct netlink_callback
	{
	struct sk_buff *skb;
	const struct nlmsghdr *nlh;
	int (dump)(struct sk_buff skb,
	struct netlink_callback *cb);
	int (done)(struct netlink_callback cb);
	int family;
	long args[6];
	};

	struct netlink_notify
	{
	struct net *net;
	int pid;
	int protocol;
	};

	static __inline__ struct nlmsghdr *
	__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
	{
	struct nlmsghdr *nlh;
	int size = NLMSG_LENGTH(len);

	nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
	nlh->nlmsg_type = type;
	nlh->nlmsg_len = size;
	nlh->nlmsg_flags = flags;
	nlh->nlmsg_pid = pid;
	nlh->nlmsg_seq = seq;
	if (!__builtin_constant_p(size) \|\| NLMSG_ALIGN(size) - size != 0)
	memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
	return nlh;
	}

	#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
	({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \
	goto nlmsg_failure; \
	__nlmsg_put(skb, pid, seq, type, len, flags); })

	#define NLMSG_PUT(skb, pid, seq, type, len) \
	NLMSG_NEW(skb, pid, seq, type, len, 0)

	extern int netlink_dump_start(struct sock ssk, struct sk_buff skb,
	const struct nlmsghdr *nlh,
	int (dump)(struct sk_buff skb, struct netlink_callback*),
	int (done)(struct netlink_callback));


	#define NL_NONROOT_RECV 0x1
	#define NL_NONROOT_SEND 0x2
	extern void netlink_set_nonroot(int protocol, unsigned flag);

	#endif /* __KERNEL__ */

	#endif /* __LINUX_NETLINK_H */