netlink.h revision 8552b387df5ff1c1df2b0a8e6585b53928838471 
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_UNUSED		1	/* Unused number				*/
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/* leave room for NETLINK_DM (DM Events) */
25#define NETLINK_SCSITRANSPORT	18	/* SCSI Transports */
26#define NETLINK_ECRYPTFS	19
27
28#define MAX_LINKS 32
29
30struct sockaddr_nl {
31	sa_family_t	nl_family;	/* AF_NETLINK	*/
32	unsigned short	nl_pad;		/* zero		*/
33	__u32		nl_pid;		/* port ID	*/
34       	__u32		nl_groups;	/* multicast groups mask */
35};
36
37struct nlmsghdr {
38	__u32		nlmsg_len;	/* Length of message including header */
39	__u16		nlmsg_type;	/* Message content */
40	__u16		nlmsg_flags;	/* Additional flags */
41	__u32		nlmsg_seq;	/* Sequence number */
42	__u32		nlmsg_pid;	/* Sending process port ID */
43};
44
45/* Flags values */
46
47#define NLM_F_REQUEST		1	/* It is request message. 	*/
48#define NLM_F_MULTI		2	/* Multipart message, terminated by NLMSG_DONE */
49#define NLM_F_ACK		4	/* Reply with ack, with zero or error code */
50#define NLM_F_ECHO		8	/* Echo this request 		*/
51
52/* Modifiers to GET request */
53#define NLM_F_ROOT	0x100	/* specify tree	root	*/
54#define NLM_F_MATCH	0x200	/* return all matching	*/
55#define NLM_F_ATOMIC	0x400	/* atomic GET		*/
56#define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)
57
58/* Modifiers to NEW request */
59#define NLM_F_REPLACE	0x100	/* Override existing		*/
60#define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
61#define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
62#define NLM_F_APPEND	0x800	/* Add to end of list		*/
63
64/*
65   4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
66   4.4BSD CHANGE	NLM_F_REPLACE
67
68   True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
69   Append		NLM_F_CREATE
70   Check		NLM_F_EXCL
71 */
72
73#define NLMSG_ALIGNTO	4U
74#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
75#define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
76#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
77#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
78#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
79#define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
80				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
81#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
82			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
83			   (nlh)->nlmsg_len <= (len))
84#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
85
86#define NLMSG_NOOP		0x1	/* Nothing.		*/
87#define NLMSG_ERROR		0x2	/* Error		*/
88#define NLMSG_DONE		0x3	/* End of a dump	*/
89#define NLMSG_OVERRUN		0x4	/* Data lost		*/
90
91#define NLMSG_MIN_TYPE		0x10	/* < 0x10: reserved control messages */
92
93struct nlmsgerr {
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#define NETLINK_BROADCAST_ERROR	4
102#define NETLINK_NO_ENOBUFS	5
103
104struct nl_pktinfo {
105	__u32	group;
106};
107
108#define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
109
110enum {
111	NETLINK_UNCONNECTED = 0,
112	NETLINK_CONNECTED,
113};
114
115/*
116 *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
117 * +---------------------+- - -+- - - - - - - - - -+- - -+
118 * |        Header       | Pad |     Payload       | Pad |
119 * |   (struct nlattr)   | ing |                   | ing |
120 * +---------------------+- - -+- - - - - - - - - -+- - -+
121 *  <-------------- nlattr->nla_len -------------->
122 */
123
124struct nlattr {
125	__u16           nla_len;
126	__u16           nla_type;
127};
128
129/*
130 * nla_type (16 bits)
131 * +---+---+-------------------------------+
132 * | N | O | Attribute Type                |
133 * +---+---+-------------------------------+
134 * N := Carries nested attributes
135 * O := Payload stored in network byte order
136 *
137 * Note: The N and O flag are mutually exclusive.
138 */
139#define NLA_F_NESTED		(1 << 15)
140#define NLA_F_NET_BYTEORDER	(1 << 14)
141#define NLA_TYPE_MASK		~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
142
143#define NLA_ALIGNTO		4
144#define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
145#define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))
146
147
148#endif	/* __LINUX_NETLINK_H */
149