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/* AF_NETLINK */ unsigned short nl_pad; /* zero */ __u32 nl_pid; /* port ID */ __u32 nl_groups; /* multicast groups mask */ }; struct nlmsghdr { __u32 nlmsg_len; /* Length of message including header */ __u16 nlmsg_type; /* Message content */ __u16 nlmsg_flags; /* Additional flags */ __u32 nlmsg_seq; /* Sequence number */ __u32 nlmsg_pid; /* Sending process port ID */ }; /* Flags values */ #define NLM_F_REQUEST 0x01 /* It is request message. */ #define NLM_F_MULTI 0x02 /* Multipart message, terminated by NLMSG_DONE */ #define NLM_F_ACK 0x04 /* Reply with ack, with zero or error code */ #define NLM_F_ECHO 0x08 /* Echo this request */ #define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */ #define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */ /* Modifiers to GET request */ #define NLM_F_ROOT 0x100 /* specify tree root */ #define NLM_F_MATCH 0x200 /* return all matching */ #define NLM_F_ATOMIC 0x400 /* atomic GET */ #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) /* Modifiers to NEW request */ #define NLM_F_REPLACE 0x100 /* Override existing */ #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ #define NLM_F_APPEND 0x800 /* Add to end of list */ /* Modifiers to DELETE request */ #define NLM_F_NONREC 0x100 /* Do not delete recursively */ /* Flags for ACK message */ #define NLM_F_CAPPED 0x100 /* request was capped */ #define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */ /* 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 4.4BSD CHANGE NLM_F_REPLACE True CHANGE NLM_F_CREATE|NLM_F_REPLACE Append NLM_F_CREATE Check NLM_F_EXCL */ #define NLMSG_ALIGNTO 4U #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) #define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN) #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ (nlh)->nlmsg_len <= (len)) #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) #define NLMSG_NOOP 0x1 /* Nothing. */ #define NLMSG_ERROR 0x2 /* Error */ #define NLMSG_DONE 0x3 /* End of a dump */ #define NLMSG_OVERRUN 0x4 /* Data lost */ #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ struct nlmsgerr { int error; struct nlmsghdr msg; /* * followed by the message contents unless NETLINK_CAP_ACK was set * or the ACK indicates success (error == 0) * message length is aligned with NLMSG_ALIGN() */ /* * followed by TLVs defined in enum nlmsgerr_attrs * if NETLINK_EXT_ACK was set */ }; /** * enum nlmsgerr_attrs - nlmsgerr attributes * @NLMSGERR_ATTR_UNUSED: unused * @NLMSGERR_ATTR_MSG: error message string (string) * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original * message, counting from the beginning of the header (u32) * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to * be used - in the success case - to identify a created * object or operation or similar (binary) * @__NLMSGERR_ATTR_MAX: number of attributes * @NLMSGERR_ATTR_MAX: highest attribute number */ enum nlmsgerr_attrs { NLMSGERR_ATTR_UNUSED, NLMSGERR_ATTR_MSG, NLMSGERR_ATTR_OFFS, NLMSGERR_ATTR_COOKIE, __NLMSGERR_ATTR_MAX, NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1 }; #define NETLINK_ADD_MEMBERSHIP 1 #define NETLINK_DROP_MEMBERSHIP 2 #define NETLINK_PKTINFO 3 #define NETLINK_BROADCAST_ERROR 4 #define NETLINK_NO_ENOBUFS 5 #define NETLINK_RX_RING 6 #define NETLINK_TX_RING 7 #define NETLINK_LISTEN_ALL_NSID 8 #define NETLINK_LIST_MEMBERSHIPS 9 #define NETLINK_CAP_ACK 10 #define NETLINK_EXT_ACK 11 #define NETLINK_GET_STRICT_CHK 12 struct nl_pktinfo { __u32 group; }; struct nl_mmap_req { unsigned int nm_block_size; unsigned int nm_block_nr; unsigned int nm_frame_size; unsigned int nm_frame_nr; }; struct nl_mmap_hdr { unsigned int nm_status; unsigned int nm_len; __u32 nm_group; /* credentials */ __u32 nm_pid; __u32 nm_uid; __u32 nm_gid; }; enum nl_mmap_status { NL_MMAP_STATUS_UNUSED, NL_MMAP_STATUS_RESERVED, NL_MMAP_STATUS_VALID, NL_MMAP_STATUS_COPY, NL_MMAP_STATUS_SKIP, }; #define NL_MMAP_MSG_ALIGNMENT NLMSG_ALIGNTO #define NL_MMAP_MSG_ALIGN(sz) __ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT) #define NL_MMAP_HDRLEN NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr)) #define NET_MAJOR 36 /* Major 36 is reserved for networking */ enum { NETLINK_UNCONNECTED = 0, NETLINK_CONNECTED, }; /* * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> * +---------------------+- - -+- - - - - - - - - -+- - -+ * | Header | Pad | Payload | Pad | * | (struct nlattr) | ing | | ing | * +---------------------+- - -+- - - - - - - - - -+- - -+ * <-------------- nlattr->nla_len --------------> */ struct nlattr { __u16 nla_len; __u16 nla_type; }; /* * nla_type (16 bits) * +---+---+-------------------------------+ * | N | O | Attribute Type | * +---+---+-------------------------------+ * N := Carries nested attributes * O := Payload stored in network byte order * * Note: The N and O flag are mutually exclusive. */ #define NLA_F_NESTED (1 << 15) #define NLA_F_NET_BYTEORDER (1 << 14) #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) #define NLA_ALIGNTO 4 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) /* Generic 32 bitflags attribute content sent to the kernel. * * The value is a bitmap that defines the values being set * The selector is a bitmask that defines which value is legit * * Examples: * value = 0x0, and selector = 0x1 * implies we are selecting bit 1 and we want to set its value to 0. * * value = 0x2, and selector = 0x2 * implies we are selecting bit 2 and we want to set its value to 1. * */ struct nla_bitfield32 { __u32 value; __u32 selector; }; #endif /* __LINUX_NETLINK_H */