[linux.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_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 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_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

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;
};

#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>

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			sid;		/* SELinux security id */
};

#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, unsigned int groups, 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_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, int nonblock,
		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, 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))
#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)


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 */
bb5427b5	8	#define NETLINK_UNUSED 1 /* Unused number */
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
7672d0b5	18	#define NETLINK_CONNECTOR 11
63522f7f	19	#define NETLINK_NETFILTER 12 /* netfilter subsystem */
1da177e4 LT	20	#define NETLINK_IP6_FW 13
	21	#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
	22	#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
20ae975d	23	#define NETLINK_GENERIC 16
84314fd4 JS	24	/* leave room for NETLINK_DM (DM Events) */
84314fd4 JS	25	#define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */
1da177e4 LT	26
	27	#define MAX_LINKS 32
	28
	29	struct sockaddr_nl
	30	{
	31	sa_family_t nl_family; /* AF_NETLINK */
	32	unsigned short nl_pad; /* zero */
	33	__u32 nl_pid; /* process pid */
	34	__u32 nl_groups; /* multicast groups mask */
	35	};
	36
	37	struct nlmsghdr
	38	{
	39	__u32 nlmsg_len; /* Length of message including header */
	40	__u16 nlmsg_type; /* Message content */
	41	__u16 nlmsg_flags; /* Additional flags */
	42	__u32 nlmsg_seq; /* Sequence number */
	43	__u32 nlmsg_pid; /* Sending process PID */
	44	};
	45
	46	/* Flags values */
	47
	48	#define NLM_F_REQUEST 1 /* It is request message. */
	49	#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
	50	#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
	51	#define NLM_F_ECHO 8 /* Echo this request */
	52
	53	/* Modifiers to GET request */
	54	#define NLM_F_ROOT 0x100 /* specify tree root */
	55	#define NLM_F_MATCH 0x200 /* return all matching */
	56	#define NLM_F_ATOMIC 0x400 /* atomic GET */
	57	#define NLM_F_DUMP (NLM_F_ROOT\|NLM_F_MATCH)
	58
	59	/* Modifiers to NEW request */
	60	#define NLM_F_REPLACE 0x100 /* Override existing */
	61	#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
	62	#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
	63	#define NLM_F_APPEND 0x800 /* Add to end of list */
	64
	65	/*
	66	4.4BSD ADD NLM_F_CREATE\|NLM_F_EXCL
	67	4.4BSD CHANGE NLM_F_REPLACE
	68
	69	True CHANGE NLM_F_CREATE\|NLM_F_REPLACE
	70	Append NLM_F_CREATE
	71	Check NLM_F_EXCL
	72	*/
	73
	74	#define NLMSG_ALIGNTO 4
	75	#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
bfa83a9e TG	76	#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
bfa83a9e TG	77	#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
1da177e4 LT	78	#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
	79	#define NLMSG_DATA(nlh) ((void)(((char)nlh) + NLMSG_LENGTH(0)))
	80	#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
	81	(struct nlmsghdr)(((char)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
	82	#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
	83	(nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
	84	(nlh)->nlmsg_len <= (len))
	85	#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
	86
	87	#define NLMSG_NOOP 0x1 /* Nothing. */
	88	#define NLMSG_ERROR 0x2 /* Error */
	89	#define NLMSG_DONE 0x3 /* End of a dump */
	90	#define NLMSG_OVERRUN 0x4 /* Data lost */
	91
bfa83a9e TG	92	#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
bfa83a9e TG	93
1da177e4 LT	94	struct nlmsgerr
	95	{
	96	int error;
	97	struct nlmsghdr msg;
	98	};
	99
9a4595bc PM	100	#define NETLINK_ADD_MEMBERSHIP 1
	101	#define NETLINK_DROP_MEMBERSHIP 2
	102	#define NETLINK_PKTINFO 3
	103
	104	struct nl_pktinfo
	105	{
	106	__u32 group;
	107	};
	108
1da177e4 LT	109	#define NET_MAJOR 36 /* Major 36 is reserved for networking */
	110
	111	enum {
	112	NETLINK_UNCONNECTED = 0,
	113	NETLINK_CONNECTED,
	114	};
	115
bfa83a9e TG	116	/*
	117	* <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
	118	* +---------------------+- - -+- - - - - - - - - -+- - -+
	119	* \| Header \| Pad \| Payload \| Pad \|
	120	* \| (struct nlattr) \| ing \| \| ing \|
	121	* +---------------------+- - -+- - - - - - - - - -+- - -+
	122	* <-------------- nlattr->nla_len -------------->
	123	*/
	124
	125	struct nlattr
	126	{
	127	__u16 nla_len;
	128	__u16 nla_type;
	129	};
	130
	131	#define NLA_ALIGNTO 4
	132	#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
	133	#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
	134
1da177e4 LT	135	#ifdef __KERNEL__
	136
	137	#include <linux/capability.h>
	138	#include <linux/skbuff.h>
	139
	140	struct netlink_skb_parms
	141	{
	142	struct ucred creds; /* Skb credentials */
	143	__u32 pid;
d629b836	144	__u32 dst_group;
1da177e4	145	kernel_cap_t eff_cap;
c94c257c	146	__u32 loginuid; /* Login (audit) uid */
e7c34970	147	__u32 sid; /* SELinux security id */
1da177e4 LT	148	};
	149
	150	#define NETLINK_CB(skb) ((struct netlink_skb_parms)&((skb)->cb))
	151	#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
	152
	153
06628607	154	extern struct sock netlink_kernel_create(int unit, unsigned int groups, void (input)(struct sock sk, int len), struct module module);
1da177e4	155	extern void netlink_ack(struct sk_buff in_skb, struct nlmsghdr nlh, int err);
4277a083	156	extern int netlink_has_listeners(struct sock *sk, unsigned int group);
1da177e4 LT	157	extern int netlink_unicast(struct sock ssk, struct sk_buff skb, __u32 pid, int nonblock);
1da177e4 LT	158	extern int netlink_broadcast(struct sock ssk, struct sk_buff skb, __u32 pid,
dd0fc66f	159	__u32 group, gfp_t allocation);
1da177e4 LT	160	extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
	161	extern int netlink_register_notifier(struct notifier_block *nb);
	162	extern int netlink_unregister_notifier(struct notifier_block *nb);
	163
	164	/* finegrained unicast helpers: */
	165	struct sock netlink_getsockbyfilp(struct file filp);
a70ea994 AK	166	int netlink_attachskb(struct sock sk, struct sk_buff skb, int nonblock,
a70ea994 AK	167	long timeo, struct sock *ssk);
1da177e4 LT	168	void netlink_detachskb(struct sock sk, struct sk_buff skb);
	169	int netlink_sendskb(struct sock sk, struct sk_buff skb, int protocol);
	170
	171	/*
	172	* skb should fit one page. This choice is good for headerless malloc.
	173	*/
	174	#define NLMSG_GOODORDER 0
	175	#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
339bf98f	176	#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
1da177e4 LT	177
	178
	179	struct netlink_callback
	180	{
	181	struct sk_buff *skb;
	182	struct nlmsghdr *nlh;
	183	int (dump)(struct sk_buff skb, struct netlink_callback *cb);
	184	int (done)(struct netlink_callback cb);
	185	int family;
18b504e2	186	long args[5];
1da177e4 LT	187	};
	188
	189	struct netlink_notify
	190	{
	191	int pid;
	192	int protocol;
	193	};
	194
	195	static __inline__ struct nlmsghdr *
1797754e	196	__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
1da177e4 LT	197	{
	198	struct nlmsghdr *nlh;
	199	int size = NLMSG_LENGTH(len);
	200
	201	nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
	202	nlh->nlmsg_type = type;
	203	nlh->nlmsg_len = size;
1797754e	204	nlh->nlmsg_flags = flags;
1da177e4 LT	205	nlh->nlmsg_pid = pid;
1da177e4 LT	206	nlh->nlmsg_seq = seq;
b3563c4f	207	memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
1da177e4 LT	208	return nlh;
	209	}
	210
1797754e	211	#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
f88a10d6 TG	212	({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
f88a10d6 TG	213	goto nlmsg_failure; \
1797754e TG	214	__nlmsg_put(skb, pid, seq, type, len, flags); })
	215
	216	#define NLMSG_PUT(skb, pid, seq, type, len) \
	217	NLMSG_NEW(skb, pid, seq, type, len, 0)
f88a10d6	218
1797754e TG	219	#define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
	220	NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
	221	(cb)->nlh->nlmsg_seq, type, len, flags)
f88a10d6 TG	222
	223	#define NLMSG_END(skb, nlh) \
	224	({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
	225	(skb)->len; })
	226
	227	#define NLMSG_CANCEL(skb, nlh) \
	228	({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
	229	-1; })
1da177e4 LT	230
	231	extern int netlink_dump_start(struct sock ssk, struct sk_buff skb,
	232	struct nlmsghdr *nlh,
	233	int (dump)(struct sk_buff skb, struct netlink_callback*),
	234	int (done)(struct netlink_callback));
	235
	236
	237	#define NL_NONROOT_RECV 0x1
	238	#define NL_NONROOT_SEND 0x2
	239	extern void netlink_set_nonroot(int protocol, unsigned flag);
	240
	241	#endif /* __KERNEL__ */
	242
	243	#endif /* __LINUX_NETLINK_H */