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      1 #ifndef _UAPI__LINUX_NETLINK_H
      2 #define _UAPI__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 
     58 /* Modifiers to GET request */
     59 #define NLM_F_ROOT	0x100	/* specify tree	root	*/
     60 #define NLM_F_MATCH	0x200	/* return all matching	*/
     61 #define NLM_F_ATOMIC	0x400	/* atomic GET		*/
     62 #define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)
     63 
     64 /* Modifiers to NEW request */
     65 #define NLM_F_REPLACE	0x100	/* Override existing		*/
     66 #define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
     67 #define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
     68 #define NLM_F_APPEND	0x800	/* Add to end of list		*/
     69 
     70 /*
     71    4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
     72    4.4BSD CHANGE	NLM_F_REPLACE
     73 
     74    True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
     75    Append		NLM_F_CREATE
     76    Check		NLM_F_EXCL
     77  */
     78 
     79 #define NLMSG_ALIGNTO	4U
     80 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
     81 #define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
     82 #define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN)
     83 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
     84 #define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
     85 #define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
     86 				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
     87 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
     88 			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
     89 			   (nlh)->nlmsg_len <= (len))
     90 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
     91 
     92 #define NLMSG_NOOP		0x1	/* Nothing.		*/
     93 #define NLMSG_ERROR		0x2	/* Error		*/
     94 #define NLMSG_DONE		0x3	/* End of a dump	*/
     95 #define NLMSG_OVERRUN		0x4	/* Data lost		*/
     96 
     97 #define NLMSG_MIN_TYPE		0x10	/* < 0x10: reserved control messages */
     98 
     99 struct nlmsgerr {
    100 	int		error;
    101 	struct nlmsghdr msg;
    102 };
    103 
    104 #define NETLINK_ADD_MEMBERSHIP	1
    105 #define NETLINK_DROP_MEMBERSHIP	2
    106 #define NETLINK_PKTINFO		3
    107 #define NETLINK_BROADCAST_ERROR	4
    108 #define NETLINK_NO_ENOBUFS	5
    109 #define NETLINK_RX_RING		6
    110 #define NETLINK_TX_RING		7
    111 
    112 struct nl_pktinfo {
    113 	__u32	group;
    114 };
    115 
    116 struct nl_mmap_req {
    117 	unsigned int	nm_block_size;
    118 	unsigned int	nm_block_nr;
    119 	unsigned int	nm_frame_size;
    120 	unsigned int	nm_frame_nr;
    121 };
    122 
    123 struct nl_mmap_hdr {
    124 	unsigned int	nm_status;
    125 	unsigned int	nm_len;
    126 	__u32		nm_group;
    127 	/* credentials */
    128 	__u32		nm_pid;
    129 	__u32		nm_uid;
    130 	__u32		nm_gid;
    131 };
    132 
    133 enum nl_mmap_status {
    134 	NL_MMAP_STATUS_UNUSED,
    135 	NL_MMAP_STATUS_RESERVED,
    136 	NL_MMAP_STATUS_VALID,
    137 	NL_MMAP_STATUS_COPY,
    138 	NL_MMAP_STATUS_SKIP,
    139 };
    140 
    141 #define NL_MMAP_MSG_ALIGNMENT		NLMSG_ALIGNTO
    142 #define NL_MMAP_MSG_ALIGN(sz)		__ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT)
    143 #define NL_MMAP_HDRLEN			NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr))
    144 
    145 #define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
    146 
    147 enum {
    148 	NETLINK_UNCONNECTED = 0,
    149 	NETLINK_CONNECTED,
    150 };
    151 
    152 /*
    153  *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
    154  * +---------------------+- - -+- - - - - - - - - -+- - -+
    155  * |        Header       | Pad |     Payload       | Pad |
    156  * |   (struct nlattr)   | ing |                   | ing |
    157  * +---------------------+- - -+- - - - - - - - - -+- - -+
    158  *  <-------------- nlattr->nla_len -------------->
    159  */
    160 
    161 struct nlattr {
    162 	__u16           nla_len;
    163 	__u16           nla_type;
    164 };
    165 
    166 /*
    167  * nla_type (16 bits)
    168  * +---+---+-------------------------------+
    169  * | N | O | Attribute Type                |
    170  * +---+---+-------------------------------+
    171  * N := Carries nested attributes
    172  * O := Payload stored in network byte order
    173  *
    174  * Note: The N and O flag are mutually exclusive.
    175  */
    176 #define NLA_F_NESTED		(1 << 15)
    177 #define NLA_F_NET_BYTEORDER	(1 << 14)
    178 #define NLA_TYPE_MASK		~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
    179 
    180 #define NLA_ALIGNTO		4
    181 #define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
    182 #define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))
    183 
    184 
    185 #endif /* _UAPI__LINUX_NETLINK_H */
    186