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      1 #ifndef __LINUX_NETLINK_H
      2 #define __LINUX_NETLINK_H
      3 
      4 #include <linux/socket.h> /* for __kernel_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_SOCK_DIAG	4	/* 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 #define NETLINK_RDMA		20
     28 #define NETLINK_CRYPTO		21	/* Crypto layer */
     29 
     30 #define NETLINK_INET_DIAG	NETLINK_SOCK_DIAG
     31 
     32 #define MAX_LINKS 32
     33 
     34 struct sockaddr_nl {
     35 	__kernel_sa_family_t	nl_family;	/* AF_NETLINK	*/
     36 	unsigned short	nl_pad;		/* zero		*/
     37 	__u32		nl_pid;		/* port ID	*/
     38        	__u32		nl_groups;	/* multicast groups mask */
     39 };
     40 
     41 struct nlmsghdr {
     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 #define NLM_F_DUMP_INTR		16	/* Dump was inconsistent due to sequence change */
     56 
     57 /* Modifiers to GET request */
     58 #define NLM_F_ROOT	0x100	/* specify tree	root	*/
     59 #define NLM_F_MATCH	0x200	/* return all matching	*/
     60 #define NLM_F_ATOMIC	0x400	/* atomic GET		*/
     61 #define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)
     62 
     63 /* Modifiers to NEW request */
     64 #define NLM_F_REPLACE	0x100	/* Override existing		*/
     65 #define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
     66 #define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
     67 #define NLM_F_APPEND	0x800	/* Add to end of list		*/
     68 
     69 /*
     70    4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
     71    4.4BSD CHANGE	NLM_F_REPLACE
     72 
     73    True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
     74    Append		NLM_F_CREATE
     75    Check		NLM_F_EXCL
     76  */
     77 
     78 #define NLMSG_ALIGNTO	4U
     79 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
     80 #define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
     81 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
     82 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
     83 #define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
     84 #define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
     85 				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
     86 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
     87 			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
     88 			   (nlh)->nlmsg_len <= (len))
     89 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
     90 
     91 #define NLMSG_NOOP		0x1	/* Nothing.		*/
     92 #define NLMSG_ERROR		0x2	/* Error		*/
     93 #define NLMSG_DONE		0x3	/* End of a dump	*/
     94 #define NLMSG_OVERRUN		0x4	/* Data lost		*/
     95 
     96 #define NLMSG_MIN_TYPE		0x10	/* < 0x10: reserved control messages */
     97 
     98 struct nlmsgerr {
     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 
    109 struct nl_pktinfo {
    110 	__u32	group;
    111 };
    112 
    113 #define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
    114 
    115 enum {
    116 	NETLINK_UNCONNECTED = 0,
    117 	NETLINK_CONNECTED,
    118 };
    119 
    120 /*
    121  *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
    122  * +---------------------+- - -+- - - - - - - - - -+- - -+
    123  * |        Header       | Pad |     Payload       | Pad |
    124  * |   (struct nlattr)   | ing |                   | ing |
    125  * +---------------------+- - -+- - - - - - - - - -+- - -+
    126  *  <-------------- nlattr->nla_len -------------->
    127  */
    128 
    129 struct nlattr {
    130 	__u16           nla_len;
    131 	__u16           nla_type;
    132 };
    133 
    134 /*
    135  * nla_type (16 bits)
    136  * +---+---+-------------------------------+
    137  * | N | O | Attribute Type                |
    138  * +---+---+-------------------------------+
    139  * N := Carries nested attributes
    140  * O := Payload stored in network byte order
    141  *
    142  * Note: The N and O flag are mutually exclusive.
    143  */
    144 #define NLA_F_NESTED		(1 << 15)
    145 #define NLA_F_NET_BYTEORDER	(1 << 14)
    146 #define NLA_TYPE_MASK		~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
    147 
    148 #define NLA_ALIGNTO		4
    149 #define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
    150 #define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))
    151 
    152 
    153 #endif	/* __LINUX_NETLINK_H */
    154