include/uapi/linux/netlink.h

   1 #ifndef _UAPI__LINUX_NETLINK_H
   2 #define _UAPI__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
  58 /* Modifiers to GET request */
  59 #define NLM_F_ROOT      0x100   /* specify tree root    */
  60 #define NLM_F_MATCH     0x200   /* return all matching  */
  61 #define NLM_F_ATOMIC    0x400   /* atomic GET           */
  62 #define NLM_F_DUMP      (NLM_F_ROOT|NLM_F_MATCH)
  63
  64 /* Modifiers to NEW request */
  65 #define NLM_F_REPLACE   0x100   /* Override existing            */
  66 #define NLM_F_EXCL      0x200   /* Do not touch, if it exists   */
  67 #define NLM_F_CREATE    0x400   /* Create, if it does not exist */
  68 #define NLM_F_APPEND    0x800   /* Add to end of list           */
  69
  70 /*
  71    4.4BSD ADD           NLM_F_CREATE|NLM_F_EXCL
  72    4.4BSD CHANGE        NLM_F_REPLACE
  73
  74    True CHANGE          NLM_F_CREATE|NLM_F_REPLACE
  75    Append               NLM_F_CREATE
  76    Check                NLM_F_EXCL
  77  */
  78
  79 #define NLMSG_ALIGNTO   4U
  80 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
  81 #define NLMSG_HDRLEN     ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
  82 #define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN)
  83 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
  84 #define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
  85 #define NLMSG_NEXT(nlh,len)      ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
  86                                   (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
  87 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
  88                            (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
  89                            (nlh)->nlmsg_len <= (len))
  90 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
  91
  92 #define NLMSG_NOOP              0x1     /* Nothing.             */
  93 #define NLMSG_ERROR             0x2     /* Error                */
  94 #define NLMSG_DONE              0x3     /* End of a dump        */
  95 #define NLMSG_OVERRUN           0x4     /* Data lost            */
  96
  97 #define NLMSG_MIN_TYPE          0x10    /* < 0x10: reserved control messages */
  98
  99 struct nlmsgerr {
 100         int             error;
 101         struct nlmsghdr msg;
 102 };
 103
 104 #define NETLINK_ADD_MEMBERSHIP  1
 105 #define NETLINK_DROP_MEMBERSHIP 2
 106 #define NETLINK_PKTINFO         3
 107 #define NETLINK_BROADCAST_ERROR 4
 108 #define NETLINK_NO_ENOBUFS      5
 109 #define NETLINK_RX_RING         6
 110 #define NETLINK_TX_RING         7
 111 #define NETLINK_LISTEN_ALL_NSID 8
 112
 113 struct nl_pktinfo {
 114         __u32   group;
 115 };
 116
 117 struct nl_mmap_req {
 118         unsigned int    nm_block_size;
 119         unsigned int    nm_block_nr;
 120         unsigned int    nm_frame_size;
 121         unsigned int    nm_frame_nr;
 122 };
 123
 124 struct nl_mmap_hdr {
 125         unsigned int    nm_status;
 126         unsigned int    nm_len;
 127         __u32           nm_group;
 128         /* credentials */
 129         __u32           nm_pid;
 130         __u32           nm_uid;
 131         __u32           nm_gid;
 132 };
 133
 134 enum nl_mmap_status {
 135         NL_MMAP_STATUS_UNUSED,
 136         NL_MMAP_STATUS_RESERVED,
 137         NL_MMAP_STATUS_VALID,
 138         NL_MMAP_STATUS_COPY,
 139         NL_MMAP_STATUS_SKIP,
 140 };
 141
 142 #define NL_MMAP_MSG_ALIGNMENT           NLMSG_ALIGNTO
 143 #define NL_MMAP_MSG_ALIGN(sz)           __ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT)
 144 #define NL_MMAP_HDRLEN                  NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr))
 145
 146 #define NET_MAJOR 36            /* Major 36 is reserved for networking                                          */
 147
 148 enum {
 149         NETLINK_UNCONNECTED = 0,
 150         NETLINK_CONNECTED,
 151 };
 152
 153 /*
 154  *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
 155  * +---------------------+- - -+- - - - - - - - - -+- - -+
 156  * |        Header       | Pad |     Payload       | Pad |
 157  * |   (struct nlattr)   | ing |                   | ing |
 158  * +---------------------+- - -+- - - - - - - - - -+- - -+
 159  *  <-------------- nlattr->nla_len -------------->
 160  */
 161
 162 struct nlattr {
 163         __u16           nla_len;
 164         __u16           nla_type;
 165 };
 166
 167 /*
 168  * nla_type (16 bits)
 169  * +---+---+-------------------------------+
 170  * | N | O | Attribute Type                |
 171  * +---+---+-------------------------------+
 172  * N := Carries nested attributes
 173  * O := Payload stored in network byte order
 174  *
 175  * Note: The N and O flag are mutually exclusive.
 176  */
 177 #define NLA_F_NESTED            (1 << 15)
 178 #define NLA_F_NET_BYTEORDER     (1 << 14)
 179 #define NLA_TYPE_MASK           ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
 180
 181 #define NLA_ALIGNTO             4
 182 #define NLA_ALIGN(len)          (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
 183 #define NLA_HDRLEN              ((int) NLA_ALIGN(sizeof(struct nlattr)))
 184
 185
 186 #endif /* _UAPI__LINUX_NETLINK_H */