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Allan Zhang4d7e3ad2015-01-21 17:08:13 -08001#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 net;
31
32struct sockaddr_nl
33{
34 sa_family_t nl_family; /* AF_NETLINK */
35 unsigned short nl_pad; /* zero */
36 __u32 nl_pid; /* port ID */
37 __u32 nl_groups; /* multicast groups mask */
38};
39
40struct 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 */
46 __u32 nlmsg_pid; /* Sending process port ID */
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) )
79#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
80#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
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
95#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
96
97struct nlmsgerr
98{
99 int error;
100 struct nlmsghdr msg;
101};
102
103#define NETLINK_ADD_MEMBERSHIP 1
104#define NETLINK_DROP_MEMBERSHIP 2
105#define NETLINK_PKTINFO 3
106#define NETLINK_BROADCAST_ERROR 4
107#define NETLINK_NO_ENOBUFS 5
108
109struct nl_pktinfo
110{
111 __u32 group;
112};
113
114#define NET_MAJOR 36 /* Major 36 is reserved for networking */
115
116enum {
117 NETLINK_UNCONNECTED = 0,
118 NETLINK_CONNECTED,
119};
120
121/*
122 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
123 * +---------------------+- - -+- - - - - - - - - -+- - -+
124 * | Header | Pad | Payload | Pad |
125 * | (struct nlattr) | ing | | ing |
126 * +---------------------+- - -+- - - - - - - - - -+- - -+
127 * <-------------- nlattr->nla_len -------------->
128 */
129
130struct nlattr
131{
132 __u16 nla_len;
133 __u16 nla_type;
134};
135
136/*
137 * nla_type (16 bits)
138 * +---+---+-------------------------------+
139 * | N | O | Attribute Type |
140 * +---+---+-------------------------------+
141 * N := Carries nested attributes
142 * O := Payload stored in network byte order
143 *
144 * Note: The N and O flag are mutually exclusive.
145 */
146#define NLA_F_NESTED (1 << 15)
147#define NLA_F_NET_BYTEORDER (1 << 14)
148#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
149
150#define NLA_ALIGNTO 4
151#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
152#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
153
154
155#endif /* __LINUX_NETLINK_H */