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1 #ifndef __LINUX_NETLINK_H
2 #define __LINUX_NETLINK_H
3 
4 #include <linux/kernel.h>
5 #include <linux/socket.h> /* for __kernel_sa_family_t */
6 #include <linux/types.h>
7 
8 #define NETLINK_ROUTE		0	/* Routing/device hook				*/
9 #define NETLINK_UNUSED		1	/* Unused number				*/
10 #define NETLINK_USERSOCK	2	/* Reserved for user mode socket protocols 	*/
11 #define NETLINK_FIREWALL	3	/* Unused number, formerly ip_queue		*/
12 #define NETLINK_SOCK_DIAG	4	/* socket monitoring				*/
13 #define NETLINK_NFLOG		5	/* netfilter/iptables ULOG */
14 #define NETLINK_XFRM		6	/* ipsec */
15 #define NETLINK_SELINUX		7	/* SELinux event notifications */
16 #define NETLINK_ISCSI		8	/* Open-iSCSI */
17 #define NETLINK_AUDIT		9	/* auditing */
18 #define NETLINK_FIB_LOOKUP	10
19 #define NETLINK_CONNECTOR	11
20 #define NETLINK_NETFILTER	12	/* netfilter subsystem */
21 #define NETLINK_IP6_FW		13
22 #define NETLINK_DNRTMSG		14	/* DECnet routing messages */
23 #define NETLINK_KOBJECT_UEVENT	15	/* Kernel messages to userspace */
24 #define NETLINK_GENERIC		16
25 /* leave room for NETLINK_DM (DM Events) */
26 #define NETLINK_SCSITRANSPORT	18	/* SCSI Transports */
27 #define NETLINK_ECRYPTFS	19
28 #define NETLINK_RDMA		20
29 #define NETLINK_CRYPTO		21	/* Crypto layer */
30 
31 #define NETLINK_INET_DIAG	NETLINK_SOCK_DIAG
32 
33 #define MAX_LINKS 32
34 
35 struct sockaddr_nl {
36 	__kernel_sa_family_t	nl_family;	/* AF_NETLINK	*/
37 	unsigned short	nl_pad;		/* zero		*/
38 	__u32		nl_pid;		/* port ID	*/
39        	__u32		nl_groups;	/* multicast groups mask */
40 };
41 
42 struct nlmsghdr {
43 	__u32		nlmsg_len;	/* Length of message including header */
44 	__u16		nlmsg_type;	/* Message content */
45 	__u16		nlmsg_flags;	/* Additional flags */
46 	__u32		nlmsg_seq;	/* Sequence number */
47 	__u32		nlmsg_pid;	/* Sending process port ID */
48 };
49 
50 /* Flags values */
51 
52 #define NLM_F_REQUEST		1	/* It is request message. 	*/
53 #define NLM_F_MULTI		2	/* Multipart message, terminated by NLMSG_DONE */
54 #define NLM_F_ACK		4	/* Reply with ack, with zero or error code */
55 #define NLM_F_ECHO		8	/* Echo this request 		*/
56 #define NLM_F_DUMP_INTR		16	/* Dump was inconsistent due to sequence change */
57 #define NLM_F_DUMP_FILTERED	32	/* Dump was filtered as requested */
58 
59 /* Modifiers to GET request */
60 #define NLM_F_ROOT	0x100	/* specify tree	root	*/
61 #define NLM_F_MATCH	0x200	/* return all matching	*/
62 #define NLM_F_ATOMIC	0x400	/* atomic GET		*/
63 #define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)
64 
65 /* Modifiers to NEW request */
66 #define NLM_F_REPLACE	0x100	/* Override existing		*/
67 #define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
68 #define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
69 #define NLM_F_APPEND	0x800	/* Add to end of list		*/
70 
71 /*
72    4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
73    4.4BSD CHANGE	NLM_F_REPLACE
74 
75    True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
76    Append		NLM_F_CREATE
77    Check		NLM_F_EXCL
78  */
79 
80 #define NLMSG_ALIGNTO	4U
81 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
82 #define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
83 #define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN)
84 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
85 #define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
86 #define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
87 				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
88 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
89 			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
90 			   (nlh)->nlmsg_len <= (len))
91 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
92 
93 #define NLMSG_NOOP		0x1	/* Nothing.		*/
94 #define NLMSG_ERROR		0x2	/* Error		*/
95 #define NLMSG_DONE		0x3	/* End of a dump	*/
96 #define NLMSG_OVERRUN		0x4	/* Data lost		*/
97 
98 #define NLMSG_MIN_TYPE		0x10	/* < 0x10: reserved control messages */
99 
100 struct nlmsgerr {
101 	int		error;
102 	struct nlmsghdr msg;
103 };
104 
105 #define NETLINK_ADD_MEMBERSHIP		1
106 #define NETLINK_DROP_MEMBERSHIP		2
107 #define NETLINK_PKTINFO			3
108 #define NETLINK_BROADCAST_ERROR		4
109 #define NETLINK_NO_ENOBUFS		5
110 #define NETLINK_RX_RING			6
111 #define NETLINK_TX_RING			7
112 #define NETLINK_LISTEN_ALL_NSID		8
113 #define NETLINK_LIST_MEMBERSHIPS	9
114 #define NETLINK_CAP_ACK			10
115 
116 struct nl_pktinfo {
117 	__u32	group;
118 };
119 
120 struct nl_mmap_req {
121 	unsigned int	nm_block_size;
122 	unsigned int	nm_block_nr;
123 	unsigned int	nm_frame_size;
124 	unsigned int	nm_frame_nr;
125 };
126 
127 struct nl_mmap_hdr {
128 	unsigned int	nm_status;
129 	unsigned int	nm_len;
130 	__u32		nm_group;
131 	/* credentials */
132 	__u32		nm_pid;
133 	__u32		nm_uid;
134 	__u32		nm_gid;
135 };
136 
137 enum nl_mmap_status {
138 	NL_MMAP_STATUS_UNUSED,
139 	NL_MMAP_STATUS_RESERVED,
140 	NL_MMAP_STATUS_VALID,
141 	NL_MMAP_STATUS_COPY,
142 	NL_MMAP_STATUS_SKIP,
143 };
144 
145 #define NL_MMAP_MSG_ALIGNMENT		NLMSG_ALIGNTO
146 #define NL_MMAP_MSG_ALIGN(sz)		__ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT)
147 #define NL_MMAP_HDRLEN			NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr))
148 
149 #define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
150 
151 enum {
152 	NETLINK_UNCONNECTED = 0,
153 	NETLINK_CONNECTED,
154 };
155 
156 /*
157  *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
158  * +---------------------+- - -+- - - - - - - - - -+- - -+
159  * |        Header       | Pad |     Payload       | Pad |
160  * |   (struct nlattr)   | ing |                   | ing |
161  * +---------------------+- - -+- - - - - - - - - -+- - -+
162  *  <-------------- nlattr->nla_len -------------->
163  */
164 
165 struct nlattr {
166 	__u16           nla_len;
167 	__u16           nla_type;
168 };
169 
170 /*
171  * nla_type (16 bits)
172  * +---+---+-------------------------------+
173  * | N | O | Attribute Type                |
174  * +---+---+-------------------------------+
175  * N := Carries nested attributes
176  * O := Payload stored in network byte order
177  *
178  * Note: The N and O flag are mutually exclusive.
179  */
180 #define NLA_F_NESTED		(1 << 15)
181 #define NLA_F_NET_BYTEORDER	(1 << 14)
182 #define NLA_TYPE_MASK		~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
183 
184 #define NLA_ALIGNTO		4
185 #define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
186 #define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))
187 
188 
189 #endif /* __LINUX_NETLINK_H */
190