[mirror_ubuntu-bionic-kernel.git] / include / 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_W1		1	/* 1-wire subsystem				*/
#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_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 MAX_LINKS 32		

struct sockaddr_nl
{
	sa_family_t	nl_family;	/* AF_NETLINK	*/
	unsigned short	nl_pad;		/* zero		*/
	__u32		nl_pid;		/* process pid	*/
       	__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 PID */
};

/* 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_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
#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		*/

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

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

enum {
	NETLINK_UNCONNECTED = 0,
	NETLINK_CONNECTED,
};

#ifdef __KERNEL__

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

struct netlink_skb_parms
{
	struct ucred		creds;		/* Skb credentials	*/
	__u32			pid;
	__u32			dst_pid;
	__u32			dst_groups;
	kernel_cap_t		eff_cap;
	__u32			loginuid;	/* Login (audit) uid */
};

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


extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len), struct module *module);
extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
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, int 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, int nonblock, long timeo);
void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);

/*
 *	skb should fit one page. This choice is good for headerless malloc.
 */
#define NLMSG_GOODORDER 0
#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))


struct netlink_callback
{
	struct sk_buff	*skb;
	struct nlmsghdr	*nlh;
	int		(*dump)(struct sk_buff * skb, struct netlink_callback *cb);
	int		(*done)(struct netlink_callback *cb);
	int		family;
	long		args[5];
};

struct netlink_notify
{
	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;
	memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
	return nlh;
}

#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
({	if (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)

#define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
	NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
		  (cb)->nlh->nlmsg_seq, type, len, flags)

#define NLMSG_END(skb, nlh) \
({	(nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
	(skb)->len; })

#define NLMSG_CANCEL(skb, nlh) \
({	skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
	-1; })

extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
			      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 */
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_NETLINK_H
	2	#define __LINUX_NETLINK_H
	3
	4	#include <linux/socket.h> /* for sa_family_t */
	5	#include <linux/types.h>
	6
	7	#define NETLINK_ROUTE 0 /* Routing/device hook */
48647fee	8	#define NETLINK_W1 1 /* 1-wire subsystem */
1da177e4 LT	9	#define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
1da177e4 LT	10	#define NETLINK_FIREWALL 3 /* Firewalling hook */
73c1f4a0	11	#define NETLINK_INET_DIAG 4 /* INET socket monitoring */
1da177e4 LT	12	#define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */
	13	#define NETLINK_XFRM 6 /* ipsec */
	14	#define NETLINK_SELINUX 7 /* SELinux event notifications */
4d479e40	15	#define NETLINK_ISCSI 8 /* Open-iSCSI */
1da177e4	16	#define NETLINK_AUDIT 9 /* auditing */
246955fe	17	#define NETLINK_FIB_LOOKUP 10
63522f7f	18	#define NETLINK_NETFILTER 12 /* netfilter subsystem */
1da177e4 LT	19	#define NETLINK_IP6_FW 13
	20	#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
	21	#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
1da177e4 LT	22
	23	#define MAX_LINKS 32
	24
	25	struct sockaddr_nl
	26	{
	27	sa_family_t nl_family; /* AF_NETLINK */
	28	unsigned short nl_pad; /* zero */
	29	__u32 nl_pid; /* process pid */
	30	__u32 nl_groups; /* multicast groups mask */
	31	};
	32
	33	struct nlmsghdr
	34	{
	35	__u32 nlmsg_len; /* Length of message including header */
	36	__u16 nlmsg_type; /* Message content */
	37	__u16 nlmsg_flags; /* Additional flags */
	38	__u32 nlmsg_seq; /* Sequence number */
	39	__u32 nlmsg_pid; /* Sending process PID */
	40	};
	41
	42	/* Flags values */
	43
	44	#define NLM_F_REQUEST 1 /* It is request message. */
	45	#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
	46	#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
	47	#define NLM_F_ECHO 8 /* Echo this request */
	48
	49	/* Modifiers to GET request */
	50	#define NLM_F_ROOT 0x100 /* specify tree root */
	51	#define NLM_F_MATCH 0x200 /* return all matching */
	52	#define NLM_F_ATOMIC 0x400 /* atomic GET */
	53	#define NLM_F_DUMP (NLM_F_ROOT\|NLM_F_MATCH)
	54
	55	/* Modifiers to NEW request */
	56	#define NLM_F_REPLACE 0x100 /* Override existing */
	57	#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
	58	#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
	59	#define NLM_F_APPEND 0x800 /* Add to end of list */
	60
	61	/*
	62	4.4BSD ADD NLM_F_CREATE\|NLM_F_EXCL
	63	4.4BSD CHANGE NLM_F_REPLACE
	64
	65	True CHANGE NLM_F_CREATE\|NLM_F_REPLACE
	66	Append NLM_F_CREATE
	67	Check NLM_F_EXCL
	68	*/
	69
	70	#define NLMSG_ALIGNTO 4
	71	#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
	72	#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
	73	#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
	74	#define NLMSG_DATA(nlh) ((void)(((char)nlh) + NLMSG_LENGTH(0)))
	75	#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
	76	(struct nlmsghdr)(((char)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
	77	#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
	78	(nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
	79	(nlh)->nlmsg_len <= (len))
	80	#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
	81
	82	#define NLMSG_NOOP 0x1 /* Nothing. */
	83	#define NLMSG_ERROR 0x2 /* Error */
	84	#define NLMSG_DONE 0x3 /* End of a dump */
	85	#define NLMSG_OVERRUN 0x4 /* Data lost */
86
87	struct nlmsgerr
88	{
89	int error;
90	struct nlmsghdr msg;
91	};
92
93	#define NET_MAJOR 36 /* Major 36 is reserved for networking */
94
95	enum {
96	NETLINK_UNCONNECTED = 0,
97	NETLINK_CONNECTED,
98	};
99
100	#ifdef __KERNEL__
101
102	#include <linux/capability.h>
103	#include <linux/skbuff.h>
104
105	struct netlink_skb_parms
106	{
107	struct ucred creds; /* Skb credentials */
108	__u32 pid;
1da177e4 LT	109	__u32 dst_pid;
	110	__u32 dst_groups;
	111	kernel_cap_t eff_cap;
c94c257c	112	__u32 loginuid; /* Login (audit) uid */
1da177e4 LT	113	};
	114
	115	#define NETLINK_CB(skb) ((struct netlink_skb_parms)&((skb)->cb))
	116	#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
	117
	118
4fdb3bb7	119	extern struct sock netlink_kernel_create(int unit, void (input)(struct sock sk, int len), struct module module);
1da177e4 LT	120	extern void netlink_ack(struct sk_buff in_skb, struct nlmsghdr nlh, int err);
	121	extern int netlink_unicast(struct sock ssk, struct sk_buff skb, __u32 pid, int nonblock);
	122	extern int netlink_broadcast(struct sock ssk, struct sk_buff skb, __u32 pid,
	123	__u32 group, int allocation);
	124	extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
	125	extern int netlink_register_notifier(struct notifier_block *nb);
	126	extern int netlink_unregister_notifier(struct notifier_block *nb);
	127
	128	/* finegrained unicast helpers: */
	129	struct sock netlink_getsockbyfilp(struct file filp);
	130	int netlink_attachskb(struct sock sk, struct sk_buff skb, int nonblock, long timeo);
	131	void netlink_detachskb(struct sock sk, struct sk_buff skb);
	132	int netlink_sendskb(struct sock sk, struct sk_buff skb, int protocol);
	133
	134	/*
	135	* skb should fit one page. This choice is good for headerless malloc.
	136	*/
	137	#define NLMSG_GOODORDER 0
	138	#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
	139
	140
	141	struct netlink_callback
	142	{
	143	struct sk_buff *skb;
	144	struct nlmsghdr *nlh;
	145	int (dump)(struct sk_buff skb, struct netlink_callback *cb);
	146	int (done)(struct netlink_callback cb);
	147	int family;
18b504e2	148	long args[5];
1da177e4 LT	149	};
	150
	151	struct netlink_notify
	152	{
	153	int pid;
	154	int protocol;
	155	};
	156
	157	static __inline__ struct nlmsghdr *
1797754e	158	__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
1da177e4 LT	159	{
	160	struct nlmsghdr *nlh;
	161	int size = NLMSG_LENGTH(len);
	162
	163	nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
	164	nlh->nlmsg_type = type;
	165	nlh->nlmsg_len = size;
1797754e	166	nlh->nlmsg_flags = flags;
1da177e4 LT	167	nlh->nlmsg_pid = pid;
1da177e4 LT	168	nlh->nlmsg_seq = seq;
b3563c4f	169	memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
1da177e4 LT	170	return nlh;
	171	}
	172
1797754e	173	#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
f88a10d6 TG	174	({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
f88a10d6 TG	175	goto nlmsg_failure; \
1797754e TG	176	__nlmsg_put(skb, pid, seq, type, len, flags); })
	177
	178	#define NLMSG_PUT(skb, pid, seq, type, len) \
	179	NLMSG_NEW(skb, pid, seq, type, len, 0)
f88a10d6	180
1797754e TG	181	#define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
	182	NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
	183	(cb)->nlh->nlmsg_seq, type, len, flags)
f88a10d6 TG	184
	185	#define NLMSG_END(skb, nlh) \
	186	({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
	187	(skb)->len; })
	188
	189	#define NLMSG_CANCEL(skb, nlh) \
	190	({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
	191	-1; })
1da177e4 LT	192
	193	extern int netlink_dump_start(struct sock ssk, struct sk_buff skb,
	194	struct nlmsghdr *nlh,
	195	int (dump)(struct sk_buff skb, struct netlink_callback*),
	196	int (done)(struct netlink_callback));
	197
	198
	199	#define NL_NONROOT_RECV 0x1
	200	#define NL_NONROOT_SEND 0x2
	201	extern void netlink_set_nonroot(int protocol, unsigned flag);
	202
	203	#endif /* __KERNEL__ */
	204
	205	#endif /* __LINUX_NETLINK_H */