[net-next-2.6.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 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

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 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 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;
	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,
			      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 */
88b4a07e	26	#define NETLINK_ECRYPTFS 19
1da177e4 LT	27
	28	#define MAX_LINKS 32
	29
b4b51029 EB	30	struct net;
b4b51029 EB	31
1da177e4 LT	32	struct sockaddr_nl
	33	{
	34	sa_family_t nl_family; /* AF_NETLINK */
	35	unsigned short nl_pad; /* zero */
cf130cb1	36	__u32 nl_pid; /* port ID */
1da177e4 LT	37	__u32 nl_groups; /* multicast groups mask */
	38	};
	39
	40	struct nlmsghdr
	41	{
	42	__u32 nlmsg_len; /* Length of message including header */
	43	__u16 nlmsg_type; /* Message content */
	44	__u16 nlmsg_flags; /* Additional flags */
	45	__u32 nlmsg_seq; /* Sequence number */
cf130cb1	46	__u32 nlmsg_pid; /* Sending process port ID */
1da177e4 LT	47	};
	48
	49	/* Flags values */
	50
	51	#define NLM_F_REQUEST 1 /* It is request message. */
	52	#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
	53	#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
	54	#define NLM_F_ECHO 8 /* Echo this request */
	55
	56	/* Modifiers to GET request */
	57	#define NLM_F_ROOT 0x100 /* specify tree root */
	58	#define NLM_F_MATCH 0x200 /* return all matching */
	59	#define NLM_F_ATOMIC 0x400 /* atomic GET */
	60	#define NLM_F_DUMP (NLM_F_ROOT\|NLM_F_MATCH)
	61
	62	/* Modifiers to NEW request */
	63	#define NLM_F_REPLACE 0x100 /* Override existing */
	64	#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
	65	#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
	66	#define NLM_F_APPEND 0x800 /* Add to end of list */
	67
	68	/*
	69	4.4BSD ADD NLM_F_CREATE\|NLM_F_EXCL
	70	4.4BSD CHANGE NLM_F_REPLACE
	71
	72	True CHANGE NLM_F_CREATE\|NLM_F_REPLACE
	73	Append NLM_F_CREATE
	74	Check NLM_F_EXCL
	75	*/
	76
	77	#define NLMSG_ALIGNTO 4
	78	#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
bfa83a9e TG	79	#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
bfa83a9e TG	80	#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
1da177e4 LT	81	#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
	82	#define NLMSG_DATA(nlh) ((void)(((char)nlh) + NLMSG_LENGTH(0)))
	83	#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
	84	(struct nlmsghdr)(((char)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
	85	#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
	86	(nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
	87	(nlh)->nlmsg_len <= (len))
	88	#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
	89
	90	#define NLMSG_NOOP 0x1 /* Nothing. */
	91	#define NLMSG_ERROR 0x2 /* Error */
	92	#define NLMSG_DONE 0x3 /* End of a dump */
	93	#define NLMSG_OVERRUN 0x4 /* Data lost */
	94
bfa83a9e TG	95	#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
bfa83a9e TG	96
1da177e4 LT	97	struct nlmsgerr
	98	{
	99	int error;
	100	struct nlmsghdr msg;
	101	};
	102
9a4595bc PM	103	#define NETLINK_ADD_MEMBERSHIP 1
	104	#define NETLINK_DROP_MEMBERSHIP 2
	105	#define NETLINK_PKTINFO 3
	106
	107	struct nl_pktinfo
	108	{
	109	__u32 group;
	110	};
	111
1da177e4 LT	112	#define NET_MAJOR 36 /* Major 36 is reserved for networking */
	113
	114	enum {
	115	NETLINK_UNCONNECTED = 0,
	116	NETLINK_CONNECTED,
	117	};
	118
bfa83a9e TG	119	/*
	120	* <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
	121	* +---------------------+- - -+- - - - - - - - - -+- - -+
	122	* \| Header \| Pad \| Payload \| Pad \|
	123	* \| (struct nlattr) \| ing \| \| ing \|
	124	* +---------------------+- - -+- - - - - - - - - -+- - -+
	125	* <-------------- nlattr->nla_len -------------->
	126	*/
	127
	128	struct nlattr
	129	{
	130	__u16 nla_len;
	131	__u16 nla_type;
	132	};
	133
8f4c1f9b TG	134	/*
	135	* nla_type (16 bits)
	136	* +---+---+-------------------------------+
	137	* \| N \| O \| Attribute Type \|
	138	* +---+---+-------------------------------+
	139	* N := Carries nested attributes
	140	* O := Payload stored in network byte order
	141	*
	142	* Note: The N and O flag are mutually exclusive.
	143	*/
	144	#define NLA_F_NESTED (1 << 15)
	145	#define NLA_F_NET_BYTEORDER (1 << 14)
	146	#define NLA_TYPE_MASK ~(NLA_F_NESTED \| NLA_F_NET_BYTEORDER)
	147
bfa83a9e TG	148	#define NLA_ALIGNTO 4
	149	#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
	150	#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
	151
1da177e4 LT	152	#ifdef __KERNEL__
	153
	154	#include <linux/capability.h>
	155	#include <linux/skbuff.h>
	156
b529ccf2 ACM	157	static inline struct nlmsghdr nlmsg_hdr(const struct sk_buff skb)
	158	{
	159	return (struct nlmsghdr *)skb->data;
	160	}
	161
1da177e4 LT	162	struct netlink_skb_parms
	163	{
	164	struct ucred creds; /* Skb credentials */
	165	__u32 pid;
d629b836	166	__u32 dst_group;
1da177e4	167	kernel_cap_t eff_cap;
c94c257c	168	__u32 loginuid; /* Login (audit) uid */
2532386f	169	__u32 sessionid; /* Session id (audit) */
e7c34970	170	__u32 sid; /* SELinux security id */
1da177e4 LT	171	};
	172
	173	#define NETLINK_CB(skb) ((struct netlink_skb_parms)&((skb)->cb))
	174	#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
	175
	176
b4b51029 EB	177	extern struct sock netlink_kernel_create(struct net net,
b4b51029 EB	178	int unit,unsigned int groups,
cd40b7d3	179	void (input)(struct sk_buff skb),
af65bdfc PM	180	struct mutex *cb_mutex,
af65bdfc PM	181	struct module *module);
b7c6ba6e	182	extern void netlink_kernel_release(struct sock *sk);
b4ff4f04	183	extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
84659eb5	184	extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group);
1da177e4	185	extern void netlink_ack(struct sk_buff in_skb, struct nlmsghdr nlh, int err);
4277a083	186	extern int netlink_has_listeners(struct sock *sk, unsigned int group);
1da177e4 LT	187	extern int netlink_unicast(struct sock ssk, struct sk_buff skb, __u32 pid, int nonblock);
1da177e4 LT	188	extern int netlink_broadcast(struct sock ssk, struct sk_buff skb, __u32 pid,
dd0fc66f	189	__u32 group, gfp_t allocation);
1da177e4 LT	190	extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
	191	extern int netlink_register_notifier(struct notifier_block *nb);
	192	extern int netlink_unregister_notifier(struct notifier_block *nb);
	193
	194	/* finegrained unicast helpers: */
	195	struct sock netlink_getsockbyfilp(struct file filp);
9457afee	196	int netlink_attachskb(struct sock sk, struct sk_buff skb,
c3d8d1e3	197	long timeo, struct sock ssk);
1da177e4	198	void netlink_detachskb(struct sock sk, struct sk_buff skb);
7ee015e0	199	int netlink_sendskb(struct sock sk, struct sk_buff skb);
1da177e4 LT	200
	201	/*
	202	* skb should fit one page. This choice is good for headerless malloc.
fc910a27 DM	203	* But we should limit to 8K so that userspace does not have to
	204	* use enormous buffer sizes on recvmsg() calls just to avoid
	205	* MSG_TRUNC when PAGE_SIZE is very large.
1da177e4	206	*/
fc910a27 DM	207	#if PAGE_SIZE < 8192UL
	208	#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
	209	#else
	210	#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
	211	#endif
	212
339bf98f	213	#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
1da177e4 LT	214
	215
	216	struct netlink_callback
	217	{
	218	struct sk_buff *skb;
	219	struct nlmsghdr *nlh;
	220	int (dump)(struct sk_buff skb, struct netlink_callback *cb);
	221	int (done)(struct netlink_callback cb);
	222	int family;
71d67e66	223	long args[6];
1da177e4 LT	224	};
	225
	226	struct netlink_notify
	227	{
b4b51029	228	struct net *net;
1da177e4 LT	229	int pid;
	230	int protocol;
	231	};
	232
	233	static __inline__ struct nlmsghdr *
1797754e	234	__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
1da177e4 LT	235	{
	236	struct nlmsghdr *nlh;
	237	int size = NLMSG_LENGTH(len);
	238
	239	nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
	240	nlh->nlmsg_type = type;
	241	nlh->nlmsg_len = size;
1797754e	242	nlh->nlmsg_flags = flags;
1da177e4 LT	243	nlh->nlmsg_pid = pid;
1da177e4 LT	244	nlh->nlmsg_seq = seq;
0c19b0ad PM	245	if (!__builtin_constant_p(size) \|\| NLMSG_ALIGN(size) - size != 0)
0c19b0ad PM	246	memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
1da177e4 LT	247	return nlh;
	248	}
	249
1797754e	250	#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
f4d900a2	251	({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \
f88a10d6	252	goto nlmsg_failure; \
1797754e TG	253	__nlmsg_put(skb, pid, seq, type, len, flags); })
	254
	255	#define NLMSG_PUT(skb, pid, seq, type, len) \
	256	NLMSG_NEW(skb, pid, seq, type, len, 0)
f88a10d6	257
1da177e4 LT	258	extern int netlink_dump_start(struct sock ssk, struct sk_buff skb,
	259	struct nlmsghdr *nlh,
	260	int (dump)(struct sk_buff skb, struct netlink_callback*),
	261	int (done)(struct netlink_callback));
	262
	263
	264	#define NL_NONROOT_RECV 0x1
	265	#define NL_NONROOT_SEND 0x2
	266	extern void netlink_set_nonroot(int protocol, unsigned flag);
	267
	268	#endif /* __KERNEL__ */
	269
	270	#endif /* __LINUX_NETLINK_H */