1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _UAPI__LINUX_NETLINK_H 3 #define _UAPI__LINUX_NETLINK_H 4 5 #include <linux/const.h> 6 #include <linux/socket.h> /* for __kernel_sa_family_t */ 7 #include <linux/types.h> 8 9 #define NETLINK_ROUTE 0 /* Routing/device hook */ 10 #define NETLINK_UNUSED 1 /* Unused number */ 11 #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ 12 #define NETLINK_FIREWALL 3 /* Unused number, formerly ip_queue */ 13 #define NETLINK_SOCK_DIAG 4 /* socket monitoring */ 14 #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ 15 #define NETLINK_XFRM 6 /* ipsec */ 16 #define NETLINK_SELINUX 7 /* SELinux event notifications */ 17 #define NETLINK_ISCSI 8 /* Open-iSCSI */ 18 #define NETLINK_AUDIT 9 /* auditing */ 19 #define NETLINK_FIB_LOOKUP 10 20 #define NETLINK_CONNECTOR 11 21 #define NETLINK_NETFILTER 12 /* netfilter subsystem */ 22 #define NETLINK_IP6_FW 13 23 #define NETLINK_DNRTMSG 14 /* DECnet routing messages (obsolete) */ 24 #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ 25 #define NETLINK_GENERIC 16 26 /* leave room for NETLINK_DM (DM Events) */ 27 #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ 28 #define NETLINK_ECRYPTFS 19 29 #define NETLINK_RDMA 20 30 #define NETLINK_CRYPTO 21 /* Crypto layer */ 31 #define NETLINK_SMC 22 /* SMC monitoring */ 32 33 #define NETLINK_INET_DIAG NETLINK_SOCK_DIAG 34 35 #define MAX_LINKS 32 36 37 struct sockaddr_nl { 38 __kernel_sa_family_t nl_family; /* AF_NETLINK */ 39 unsigned short nl_pad; /* zero */ 40 __u32 nl_pid; /* port ID */ 41 __u32 nl_groups; /* multicast groups mask */ 42 }; 43 44 struct nlmsghdr { 45 __u32 nlmsg_len; /* Length of message including header */ 46 __u16 nlmsg_type; /* Message content */ 47 __u16 nlmsg_flags; /* Additional flags */ 48 __u32 nlmsg_seq; /* Sequence number */ 49 __u32 nlmsg_pid; /* Sending process port ID */ 50 }; 51 52 /* Flags values */ 53 54 #define NLM_F_REQUEST 0x01 /* It is request message. */ 55 #define NLM_F_MULTI 0x02 /* Multipart message, terminated by NLMSG_DONE */ 56 #define NLM_F_ACK 0x04 /* Reply with ack, with zero or error code */ 57 #define NLM_F_ECHO 0x08 /* Echo this request */ 58 #define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */ 59 #define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */ 60 61 /* Modifiers to GET request */ 62 #define NLM_F_ROOT 0x100 /* specify tree root */ 63 #define NLM_F_MATCH 0x200 /* return all matching */ 64 #define NLM_F_ATOMIC 0x400 /* atomic GET */ 65 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 66 67 /* Modifiers to NEW request */ 68 #define NLM_F_REPLACE 0x100 /* Override existing */ 69 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 70 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 71 #define NLM_F_APPEND 0x800 /* Add to end of list */ 72 73 /* Modifiers to DELETE request */ 74 #define NLM_F_NONREC 0x100 /* Do not delete recursively */ 75 76 /* Flags for ACK message */ 77 #define NLM_F_CAPPED 0x100 /* request was capped */ 78 #define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */ 79 80 /* 81 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 82 4.4BSD CHANGE NLM_F_REPLACE 83 84 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 85 Append NLM_F_CREATE 86 Check NLM_F_EXCL 87 */ 88 89 #define NLMSG_ALIGNTO 4U 90 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 91 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) 92 #define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN) 93 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 94 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 95 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 96 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 97 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ 98 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 99 (nlh)->nlmsg_len <= (len)) 100 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 101 102 #define NLMSG_NOOP 0x1 /* Nothing. */ 103 #define NLMSG_ERROR 0x2 /* Error */ 104 #define NLMSG_DONE 0x3 /* End of a dump */ 105 #define NLMSG_OVERRUN 0x4 /* Data lost */ 106 107 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ 108 109 struct nlmsgerr { 110 int error; 111 struct nlmsghdr msg; 112 /* 113 * followed by the message contents unless NETLINK_CAP_ACK was set 114 * or the ACK indicates success (error == 0) 115 * message length is aligned with NLMSG_ALIGN() 116 */ 117 /* 118 * followed by TLVs defined in enum nlmsgerr_attrs 119 * if NETLINK_EXT_ACK was set 120 */ 121 }; 122 123 /** 124 * enum nlmsgerr_attrs - nlmsgerr attributes 125 * @NLMSGERR_ATTR_UNUSED: unused 126 * @NLMSGERR_ATTR_MSG: error message string (string) 127 * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original 128 * message, counting from the beginning of the header (u32) 129 * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to 130 * be used - in the success case - to identify a created 131 * object or operation or similar (binary) 132 * @__NLMSGERR_ATTR_MAX: number of attributes 133 * @NLMSGERR_ATTR_MAX: highest attribute number 134 */ 135 enum nlmsgerr_attrs { 136 NLMSGERR_ATTR_UNUSED, 137 NLMSGERR_ATTR_MSG, 138 NLMSGERR_ATTR_OFFS, 139 NLMSGERR_ATTR_COOKIE, 140 141 __NLMSGERR_ATTR_MAX, 142 NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1 143 }; 144 145 #define NETLINK_ADD_MEMBERSHIP 1 146 #define NETLINK_DROP_MEMBERSHIP 2 147 #define NETLINK_PKTINFO 3 148 #define NETLINK_BROADCAST_ERROR 4 149 #define NETLINK_NO_ENOBUFS 5 150 #ifndef __KERNEL__ 151 #define NETLINK_RX_RING 6 152 #define NETLINK_TX_RING 7 153 #endif 154 #define NETLINK_LISTEN_ALL_NSID 8 155 #define NETLINK_LIST_MEMBERSHIPS 9 156 #define NETLINK_CAP_ACK 10 157 #define NETLINK_EXT_ACK 11 158 159 struct nl_pktinfo { 160 __u32 group; 161 }; 162 163 struct nl_mmap_req { 164 unsigned int nm_block_size; 165 unsigned int nm_block_nr; 166 unsigned int nm_frame_size; 167 unsigned int nm_frame_nr; 168 }; 169 170 struct nl_mmap_hdr { 171 unsigned int nm_status; 172 unsigned int nm_len; 173 __u32 nm_group; 174 /* credentials */ 175 __u32 nm_pid; 176 __u32 nm_uid; 177 __u32 nm_gid; 178 }; 179 180 #ifndef __KERNEL__ 181 enum nl_mmap_status { 182 NL_MMAP_STATUS_UNUSED, 183 NL_MMAP_STATUS_RESERVED, 184 NL_MMAP_STATUS_VALID, 185 NL_MMAP_STATUS_COPY, 186 NL_MMAP_STATUS_SKIP, 187 }; 188 189 #define NL_MMAP_MSG_ALIGNMENT NLMSG_ALIGNTO 190 #define NL_MMAP_MSG_ALIGN(sz) __ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT) 191 #define NL_MMAP_HDRLEN NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr)) 192 #endif 193 194 #define NET_MAJOR 36 /* Major 36 is reserved for networking */ 195 196 enum { 197 NETLINK_UNCONNECTED = 0, 198 NETLINK_CONNECTED, 199 }; 200 201 /* 202 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> 203 * +---------------------+- - -+- - - - - - - - - -+- - -+ 204 * | Header | Pad | Payload | Pad | 205 * | (struct nlattr) | ing | | ing | 206 * +---------------------+- - -+- - - - - - - - - -+- - -+ 207 * <-------------- nlattr->nla_len --------------> 208 */ 209 210 struct nlattr { 211 __u16 nla_len; 212 __u16 nla_type; 213 }; 214 215 /* 216 * nla_type (16 bits) 217 * +---+---+-------------------------------+ 218 * | N | O | Attribute Type | 219 * +---+---+-------------------------------+ 220 * N := Carries nested attributes 221 * O := Payload stored in network byte order 222 * 223 * Note: The N and O flag are mutually exclusive. 224 */ 225 #define NLA_F_NESTED (1 << 15) 226 #define NLA_F_NET_BYTEORDER (1 << 14) 227 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) 228 229 #define NLA_ALIGNTO 4 230 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) 231 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) 232 233 /* Generic 32 bitflags attribute content sent to the kernel. 234 * 235 * The value is a bitmap that defines the values being set 236 * The selector is a bitmask that defines which value is legit 237 * 238 * Examples: 239 * value = 0x0, and selector = 0x1 240 * implies we are selecting bit 1 and we want to set its value to 0. 241 * 242 * value = 0x2, and selector = 0x2 243 * implies we are selecting bit 2 and we want to set its value to 1. 244 * 245 */ 246 struct nla_bitfield32 { 247 __u32 value; 248 __u32 selector; 249 }; 250 251 #endif /* _UAPI__LINUX_NETLINK_H */ 252