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