netlink.h revision 09954dc61adc3051cbb2127e2bfcf692502c8306 
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_W1		1	/* 1-wire subsystem				*/
9#define NETLINK_USERSOCK	2	/* Reserved for user mode socket protocols 	*/
10#define NETLINK_FIREWALL	3	/* Firewalling hook				*/
11#define NETLINK_INET_DIAG	4	/* INET 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_ISCSI		8	/* Open-iSCSI */
16#define NETLINK_AUDIT		9	/* auditing */
17#define NETLINK_FIB_LOOKUP	10
18#define NETLINK_CONNECTOR	11
19#define NETLINK_NETFILTER	12	/* netfilter subsystem */
20#define NETLINK_IP6_FW		13
21#define NETLINK_DNRTMSG		14	/* DECnet routing messages */
22#define NETLINK_KOBJECT_UEVENT	15	/* Kernel messages to userspace */
23#define NETLINK_GENERIC		16
24
25#define MAX_LINKS 32
26
27struct sockaddr_nl
28{
29	sa_family_t	nl_family;	/* AF_NETLINK	*/
30	unsigned short	nl_pad;		/* zero		*/
31	__u32		nl_pid;		/* process pid	*/
32       	__u32		nl_groups;	/* multicast groups mask */
33};
34
35struct nlmsghdr
36{
37	__u32		nlmsg_len;	/* Length of message including header */
38	__u16		nlmsg_type;	/* Message content */
39	__u16		nlmsg_flags;	/* Additional flags */
40	__u32		nlmsg_seq;	/* Sequence number */
41	__u32		nlmsg_pid;	/* Sending process PID */
42};
43
44/* Flags values */
45
46#define NLM_F_REQUEST		1	/* It is request message. 	*/
47#define NLM_F_MULTI		2	/* Multipart message, terminated by NLMSG_DONE */
48#define NLM_F_ACK		4	/* Reply with ack, with zero or error code */
49#define NLM_F_ECHO		8	/* Echo this request 		*/
50
51/* Modifiers to GET request */
52#define NLM_F_ROOT	0x100	/* specify tree	root	*/
53#define NLM_F_MATCH	0x200	/* return all matching	*/
54#define NLM_F_ATOMIC	0x400	/* atomic GET		*/
55#define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)
56
57/* Modifiers to NEW request */
58#define NLM_F_REPLACE	0x100	/* Override existing		*/
59#define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
60#define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
61#define NLM_F_APPEND	0x800	/* Add to end of list		*/
62
63/*
64   4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
65   4.4BSD CHANGE	NLM_F_REPLACE
66
67   True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
68   Append		NLM_F_CREATE
69   Check		NLM_F_EXCL
70 */
71
72#define NLMSG_ALIGNTO	4
73#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
74#define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
75#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
76#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
77#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
78#define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
79				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
80#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
81			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
82			   (nlh)->nlmsg_len <= (len))
83#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
84
85#define NLMSG_NOOP		0x1	/* Nothing.		*/
86#define NLMSG_ERROR		0x2	/* Error		*/
87#define NLMSG_DONE		0x3	/* End of a dump	*/
88#define NLMSG_OVERRUN		0x4	/* Data lost		*/
89
90#define NLMSG_MIN_TYPE		0x10	/* < 0x10: reserved control messages */
91
92struct nlmsgerr
93{
94	int		error;
95	struct nlmsghdr msg;
96};
97
98#define NETLINK_ADD_MEMBERSHIP	1
99#define NETLINK_DROP_MEMBERSHIP	2
100#define NETLINK_PKTINFO		3
101
102struct nl_pktinfo
103{
104	__u32	group;
105};
106
107#define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
108
109enum {
110	NETLINK_UNCONNECTED = 0,
111	NETLINK_CONNECTED,
112};
113
114/*
115 *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
116 * +---------------------+- - -+- - - - - - - - - -+- - -+
117 * |        Header       | Pad |     Payload       | Pad |
118 * |   (struct nlattr)   | ing |                   | ing |
119 * +---------------------+- - -+- - - - - - - - - -+- - -+
120 *  <-------------- nlattr->nla_len -------------->
121 */
122
123struct nlattr
124{
125	__u16           nla_len;
126	__u16           nla_type;
127};
128
129#define NLA_ALIGNTO		4
130#define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
131#define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))
132
133
134#endif	/* __LINUX_NETLINK_H */
135