LXR linux/include/uapi/linux/netlink.h

   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/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       11
  21#define NETLINK_NETFILTER       12      /* netfilter subsystem */
  22#define NETLINK_IP6_FW          13
  23#define NETLINK_DNRTMSG         14      /* DECnet routing messages */
  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
  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_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
 109struct 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 */
 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 - 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#define NETLINK_GET_STRICT_CHK          12
 159
 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_ALIGNTO
 191#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#endif
 194
 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 attributes
 222 * O := Payload stored in network byte order
 223 *
 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             4
 231#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 set
 237 * The selector is a bitmask that defines which value is legit
 238 *
 239 * Examples:
 240 *  value = 0x0, and selector = 0x1
 241 *  implies we are selecting bit 1 and we want to set its value to 0.
 242 *
 243 *  value = 0x2, and selector = 0x2
 244 *  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