netlink.h revision e760a19a437997820f16846636c0db23faa6d3ba
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#define NETLINK_RDMA 20 28 29#define MAX_LINKS 32 30 31struct sockaddr_nl { 32 sa_family_t nl_family; /* AF_NETLINK */ 33 unsigned short nl_pad; /* zero */ 34 __u32 nl_pid; /* port ID */ 35 __u32 nl_groups; /* multicast groups mask */ 36}; 37 38struct nlmsghdr { 39 __u32 nlmsg_len; /* Length of message including header */ 40 __u16 nlmsg_type; /* Message content */ 41 __u16 nlmsg_flags; /* Additional flags */ 42 __u32 nlmsg_seq; /* Sequence number */ 43 __u32 nlmsg_pid; /* Sending process port ID */ 44}; 45 46/* Flags values */ 47 48#define NLM_F_REQUEST 1 /* It is request message. */ 49#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ 50#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ 51#define NLM_F_ECHO 8 /* Echo this request */ 52 53/* Modifiers to GET request */ 54#define NLM_F_ROOT 0x100 /* specify tree root */ 55#define NLM_F_MATCH 0x200 /* return all matching */ 56#define NLM_F_ATOMIC 0x400 /* atomic GET */ 57#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 58 59/* Modifiers to NEW request */ 60#define NLM_F_REPLACE 0x100 /* Override existing */ 61#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 62#define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 63#define NLM_F_APPEND 0x800 /* Add to end of list */ 64 65/* 66 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 67 4.4BSD CHANGE NLM_F_REPLACE 68 69 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 70 Append NLM_F_CREATE 71 Check NLM_F_EXCL 72 */ 73 74#define NLMSG_ALIGNTO 4U 75#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 76#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) 77#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) 78#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 79#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 80#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 81 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 82#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ 83 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 84 (nlh)->nlmsg_len <= (len)) 85#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 86 87#define NLMSG_NOOP 0x1 /* Nothing. */ 88#define NLMSG_ERROR 0x2 /* Error */ 89#define NLMSG_DONE 0x3 /* End of a dump */ 90#define NLMSG_OVERRUN 0x4 /* Data lost */ 91 92#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ 93 94struct nlmsgerr { 95 int error; 96 struct nlmsghdr msg; 97}; 98 99#define NETLINK_ADD_MEMBERSHIP 1 100#define NETLINK_DROP_MEMBERSHIP 2 101#define NETLINK_PKTINFO 3 102#define NETLINK_BROADCAST_ERROR 4 103#define NETLINK_NO_ENOBUFS 5 104 105struct nl_pktinfo { 106 __u32 group; 107}; 108 109#define NET_MAJOR 36 /* Major 36 is reserved for networking */ 110 111enum { 112 NETLINK_UNCONNECTED = 0, 113 NETLINK_CONNECTED, 114}; 115 116/* 117 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> 118 * +---------------------+- - -+- - - - - - - - - -+- - -+ 119 * | Header | Pad | Payload | Pad | 120 * | (struct nlattr) | ing | | ing | 121 * +---------------------+- - -+- - - - - - - - - -+- - -+ 122 * <-------------- nlattr->nla_len --------------> 123 */ 124 125struct nlattr { 126 __u16 nla_len; 127 __u16 nla_type; 128}; 129 130/* 131 * nla_type (16 bits) 132 * +---+---+-------------------------------+ 133 * | N | O | Attribute Type | 134 * +---+---+-------------------------------+ 135 * N := Carries nested attributes 136 * O := Payload stored in network byte order 137 * 138 * Note: The N and O flag are mutually exclusive. 139 */ 140#define NLA_F_NESTED (1 << 15) 141#define NLA_F_NET_BYTEORDER (1 << 14) 142#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) 143 144#define NLA_ALIGNTO 4 145#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) 146#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) 147 148 149#endif /* __LINUX_NETLINK_H */ 150