253 lines · c
1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2#ifndef _UAPI__LINUX_NETLINK_H3#define _UAPI__LINUX_NETLINK_H4 5#include <linux/kernel.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 1121#define NETLINK_NETFILTER 12 /* netfilter subsystem */22#define NETLINK_IP6_FW 1323#define NETLINK_DNRTMSG 14 /* DECnet routing messages */24#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */25#define NETLINK_GENERIC 1626/* leave room for NETLINK_DM (DM Events) */27#define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */28#define NETLINK_ECRYPTFS 1929#define NETLINK_RDMA 2030#define NETLINK_CRYPTO 21 /* Crypto layer */31#define NETLINK_SMC 22 /* SMC monitoring */32 33#define NETLINK_INET_DIAG NETLINK_SOCK_DIAG34 35#define MAX_LINKS 32 36 37struct 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 44struct 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_EXCL82 4.4BSD CHANGE NLM_F_REPLACE83 84 True CHANGE NLM_F_CREATE|NLM_F_REPLACE85 Append NLM_F_CREATE86 Check NLM_F_EXCL87 */88 89#define NLMSG_ALIGNTO 4U90#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 109struct nlmsgerr {110 int error;111 struct nlmsghdr msg;112 /*113 * followed by the message contents unless NETLINK_CAP_ACK was set114 * 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_attrs119 * if NETLINK_EXT_ACK was set120 */121};122 123/**124 * enum nlmsgerr_attrs - nlmsgerr attributes125 * @NLMSGERR_ATTR_UNUSED: unused126 * @NLMSGERR_ATTR_MSG: error message string (string)127 * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original128 * message, counting from the beginning of the header (u32)129 * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to130 * be used - in the success case - to identify a created131 * object or operation or similar (binary)132 * @__NLMSGERR_ATTR_MAX: number of attributes133 * @NLMSGERR_ATTR_MAX: highest attribute number134 */135enum 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 - 1143};144 145#define NETLINK_ADD_MEMBERSHIP 1146#define NETLINK_DROP_MEMBERSHIP 2147#define NETLINK_PKTINFO 3148#define NETLINK_BROADCAST_ERROR 4149#define NETLINK_NO_ENOBUFS 5150#ifndef __KERNEL__151#define NETLINK_RX_RING 6152#define NETLINK_TX_RING 7153#endif154#define NETLINK_LISTEN_ALL_NSID 8155#define NETLINK_LIST_MEMBERSHIPS 9156#define NETLINK_CAP_ACK 10157#define NETLINK_EXT_ACK 11158#define NETLINK_GET_STRICT_CHK 12159 160struct nl_pktinfo {161 __u32 group;162};163 164struct nl_mmap_req {165 unsigned int nm_block_size;166 unsigned int nm_block_nr;167 unsigned int nm_frame_size;168 unsigned int nm_frame_nr;169};170 171struct nl_mmap_hdr {172 unsigned int nm_status;173 unsigned int nm_len;174 __u32 nm_group;175 /* credentials */176 __u32 nm_pid;177 __u32 nm_uid;178 __u32 nm_gid;179};180 181#ifndef __KERNEL__182enum nl_mmap_status {183 NL_MMAP_STATUS_UNUSED,184 NL_MMAP_STATUS_RESERVED,185 NL_MMAP_STATUS_VALID,186 NL_MMAP_STATUS_COPY,187 NL_MMAP_STATUS_SKIP,188};189 190#define NL_MMAP_MSG_ALIGNMENT NLMSG_ALIGNTO191#define NL_MMAP_MSG_ALIGN(sz) __ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT)192#define NL_MMAP_HDRLEN NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr))193#endif194 195#define NET_MAJOR 36 /* Major 36 is reserved for networking */196 197enum {198 NETLINK_UNCONNECTED = 0,199 NETLINK_CONNECTED,200};201 202/*203 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->204 * +---------------------+- - -+- - - - - - - - - -+- - -+205 * | Header | Pad | Payload | Pad |206 * | (struct nlattr) | ing | | ing |207 * +---------------------+- - -+- - - - - - - - - -+- - -+208 * <-------------- nlattr->nla_len -------------->209 */210 211struct nlattr {212 __u16 nla_len;213 __u16 nla_type;214};215 216/*217 * nla_type (16 bits)218 * +---+---+-------------------------------+219 * | N | O | Attribute Type |220 * +---+---+-------------------------------+221 * N := Carries nested attributes222 * O := Payload stored in network byte order223 *224 * Note: The N and O flag are mutually exclusive.225 */226#define NLA_F_NESTED (1 << 15)227#define NLA_F_NET_BYTEORDER (1 << 14)228#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)229 230#define NLA_ALIGNTO 4231#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))232#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))233 234/* Generic 32 bitflags attribute content sent to the kernel.235 *236 * The value is a bitmap that defines the values being set237 * The selector is a bitmask that defines which value is legit238 *239 * Examples:240 * value = 0x0, and selector = 0x1241 * implies we are selecting bit 1 and we want to set its value to 0.242 *243 * value = 0x2, and selector = 0x2244 * implies we are selecting bit 2 and we want to set its value to 1.245 *246 */247struct nla_bitfield32 {248 __u32 value;249 __u32 selector;250};251 252#endif /* _UAPI__LINUX_NETLINK_H */253