LXR linux/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
  35struct 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
  42struct 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
  99struct 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
 112struct nl_pktinfo {
 113        __u32   group;
 114};
 115
 116struct nl_mmap_req {
 117        unsigned int    nm_block_size;
 118        unsigned int    nm_block_nr;
 119        unsigned int    nm_frame_size;
 120        unsigned int    nm_frame_nr;
 121};
 122
 123struct nl_mmap_hdr {
 124        unsigned int    nm_status;
 125        unsigned int    nm_len;
 126        __u32           nm_group;
 127        /* credentials */
 128        __u32           nm_pid;
 129        __u32           nm_uid;
 130        __u32           nm_gid;
 131};
 132
 133enum nl_mmap_status {
 134        NL_MMAP_STATUS_UNUSED,
 135        NL_MMAP_STATUS_RESERVED,
 136        NL_MMAP_STATUS_VALID,
 137        NL_MMAP_STATUS_COPY,
 138        NL_MMAP_STATUS_SKIP,
 139};
 140
 141#define NL_MMAP_MSG_ALIGNMENT           NLMSG_ALIGNTO
 142#define NL_MMAP_MSG_ALIGN(sz)           __ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT)
 143#define NL_MMAP_HDRLEN                  NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr))
 144
 145#define NET_MAJOR 36            /* Major 36 is reserved for networking                                          */
 146
 147enum {
 148        NETLINK_UNCONNECTED = 0,
 149        NETLINK_CONNECTED,
 150};
 151
 152/*
 153 *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
 154 * +---------------------+- - -+- - - - - - - - - -+- - -+
 155 * |        Header       | Pad |     Payload       | Pad |
 156 * |   (struct nlattr)   | ing |                   | ing |
 157 * +---------------------+- - -+- - - - - - - - - -+- - -+
 158 *  <-------------- nlattr->nla_len -------------->
 159 */
 160
 161struct nlattr {
 162        __u16           nla_len;
 163        __u16           nla_type;
 164};
 165
 166/*
 167 * nla_type (16 bits)
 168 * +---+---+-------------------------------+
 169 * | N | O | Attribute Type                |
 170 * +---+---+-------------------------------+
 171 * N := Carries nested attributes
 172 * O := Payload stored in network byte order
 173 *
 174 * Note: The N and O flag are mutually exclusive.
 175 */
 176#define NLA_F_NESTED            (1 << 15)
 177#define NLA_F_NET_BYTEORDER     (1 << 14)
 178#define NLA_TYPE_MASK           ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
 179
 180#define NLA_ALIGNTO             4
 181#define NLA_ALIGN(len)          (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
 182#define NLA_HDRLEN              ((int) NLA_ALIGN(sizeof(struct nlattr)))
 183
 184
 185#endif /* _UAPI__LINUX_NETLINK_H */
 186