netlink.h revision 0633baa17231b777e75b813439c237e3de380cc8 
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				*/
8#define NETLINK_SKIP		1	/* Reserved for ENskip  			*/
9#define NETLINK_USERSOCK	2	/* Reserved for user mode socket protocols 	*/
10#define NETLINK_FIREWALL	3	/* Firewalling hook				*/
11#define NETLINK_TCPDIAG		4	/* TCP socket monitoring			*/
12#define NETLINK_NFLOG		5	/* netfilter/iptables ULOG */
13#define NETLINK_XFRM		6	/* ipsec */
14#define NETLINK_SELINUX		7	/* SELinux event notifications */
15#define NETLINK_ARPD		8
16#define NETLINK_AUDIT		9	/* auditing */
17#define NETLINK_ROUTE6		11	/* af_inet6 route comm channel */
18#define NETLINK_IP6_FW		13
19#define NETLINK_DNRTMSG		14	/* DECnet routing messages */
20#define NETLINK_TAPBASE		16	/* 16 to 31 are ethertap */
21
22#define MAX_LINKS 32
23
24struct sockaddr_nl
25{
26	sa_family_t	nl_family;	/* AF_NETLINK	*/
27	unsigned short	nl_pad;		/* zero		*/
28	__u32		nl_pid;		/* process pid	*/
29       	__u32		nl_groups;	/* multicast groups mask */
30};
31
32struct nlmsghdr
33{
34	__u32		nlmsg_len;	/* Length of message including header */
35	__u16		nlmsg_type;	/* Message content */
36	__u16		nlmsg_flags;	/* Additional flags */
37	__u32		nlmsg_seq;	/* Sequence number */
38	__u32		nlmsg_pid;	/* Sending process PID */
39};
40
41/* Flags values */
42
43#define NLM_F_REQUEST		1	/* It is request message. 	*/
44#define NLM_F_MULTI		2	/* Multipart message, terminated by NLMSG_DONE */
45#define NLM_F_ACK		4	/* Reply with ack, with zero or error code */
46#define NLM_F_ECHO		8	/* Echo this request 		*/
47
48/* Modifiers to GET request */
49#define NLM_F_ROOT	0x100	/* specify tree	root	*/
50#define NLM_F_MATCH	0x200	/* return all matching	*/
51#define NLM_F_ATOMIC	0x400	/* atomic GET		*/
52#define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)
53
54/* Modifiers to NEW request */
55#define NLM_F_REPLACE	0x100	/* Override existing		*/
56#define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
57#define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
58#define NLM_F_APPEND	0x800	/* Add to end of list		*/
59
60/*
61   4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
62   4.4BSD CHANGE	NLM_F_REPLACE
63
64   True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
65   Append		NLM_F_CREATE
66   Check		NLM_F_EXCL
67 */
68
69#define NLMSG_ALIGNTO	4
70#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
71#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
72#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
73#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
74#define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
75				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
76#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
77			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
78			   (nlh)->nlmsg_len <= (len))
79#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
80
81#define NLMSG_NOOP		0x1	/* Nothing.		*/
82#define NLMSG_ERROR		0x2	/* Error		*/
83#define NLMSG_DONE		0x3	/* End of a dump	*/
84#define NLMSG_OVERRUN		0x4	/* Data lost		*/
85
86struct nlmsgerr
87{
88	int		error;
89	struct nlmsghdr msg;
90};
91
92#define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
93
94enum {
95	NETLINK_UNCONNECTED = 0,
96	NETLINK_CONNECTED,
97};
98
99
100#endif	/* __LINUX_NETLINK_H */
101