LXR linux/include/linux/netlink.h

   1#ifndef __LINUX_NETLINK_H
   2#define __LINUX_NETLINK_H
   3
   4#include <linux/socket.h> /* for sa_family_t */
   5#include <linux/types.h>
   6
   7#define NETLINK_ROUTE           0       /* Routing/device hook                          */
   8#define NETLINK_UNUSED          1       /* Unused number                                */
   9#define NETLINK_USERSOCK        2       /* Reserved for user mode socket protocols      */
  10#define NETLINK_FIREWALL        3       /* Firewalling hook                             */
  11#define NETLINK_INET_DIAG       4       /* INET socket monitoring                       */
  12#define NETLINK_NFLOG           5       /* netfilter/iptables ULOG */
  13#define NETLINK_XFRM            6       /* ipsec */
  14#define NETLINK_SELINUX         7       /* SELinux event notifications */
  15#define NETLINK_ISCSI           8       /* Open-iSCSI */
  16#define NETLINK_AUDIT           9       /* auditing */
  17#define NETLINK_FIB_LOOKUP      10      
  18#define NETLINK_CONNECTOR       11
  19#define NETLINK_NETFILTER       12      /* netfilter subsystem */
  20#define NETLINK_IP6_FW          13
  21#define NETLINK_DNRTMSG         14      /* DECnet routing messages */
  22#define NETLINK_KOBJECT_UEVENT  15      /* Kernel messages to userspace */
  23#define NETLINK_GENERIC         16
  24
  25#define MAX_LINKS 32            
  26
  27struct sockaddr_nl
  28{
  29        sa_family_t     nl_family;      /* AF_NETLINK   */
  30        unsigned short  nl_pad;         /* zero         */
  31        __u32           nl_pid;         /* process pid  */
  32        __u32           nl_groups;      /* multicast groups mask */
  33};
  34
  35struct nlmsghdr
  36{
  37        __u32           nlmsg_len;      /* Length of message including header */
  38        __u16           nlmsg_type;     /* Message content */
  39        __u16           nlmsg_flags;    /* Additional flags */
  40        __u32           nlmsg_seq;      /* Sequence number */
  41        __u32           nlmsg_pid;      /* Sending process PID */
  42};
  43
  44/* Flags values */
  45
  46#define NLM_F_REQUEST           1       /* It is request message.       */
  47#define NLM_F_MULTI             2       /* Multipart message, terminated by NLMSG_DONE */
  48#define NLM_F_ACK               4       /* Reply with ack, with zero or error code */
  49#define NLM_F_ECHO              8       /* Echo this request            */
  50
  51/* Modifiers to GET request */
  52#define NLM_F_ROOT      0x100   /* specify tree root    */
  53#define NLM_F_MATCH     0x200   /* return all matching  */
  54#define NLM_F_ATOMIC    0x400   /* atomic GET           */
  55#define NLM_F_DUMP      (NLM_F_ROOT|NLM_F_MATCH)
  56
  57/* Modifiers to NEW request */
  58#define NLM_F_REPLACE   0x100   /* Override existing            */
  59#define NLM_F_EXCL      0x200   /* Do not touch, if it exists   */
  60#define NLM_F_CREATE    0x400   /* Create, if it does not exist */
  61#define NLM_F_APPEND    0x800   /* Add to end of list           */
  62
  63/*
  64   4.4BSD ADD           NLM_F_CREATE|NLM_F_EXCL
  65   4.4BSD CHANGE        NLM_F_REPLACE
  66
  67   True CHANGE          NLM_F_CREATE|NLM_F_REPLACE
  68   Append               NLM_F_CREATE
  69   Check                NLM_F_EXCL
  70 */
  71
  72#define NLMSG_ALIGNTO   4
  73#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
  74#define NLMSG_HDRLEN     ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
  75#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
  76#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
  77#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
  78#define NLMSG_NEXT(nlh,len)      ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
  79                                  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
  80#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
  81                           (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
  82                           (nlh)->nlmsg_len <= (len))
  83#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
  84
  85#define NLMSG_NOOP              0x1     /* Nothing.             */
  86#define NLMSG_ERROR             0x2     /* Error                */
  87#define NLMSG_DONE              0x3     /* End of a dump        */
  88#define NLMSG_OVERRUN           0x4     /* Data lost            */
  89
  90#define NLMSG_MIN_TYPE          0x10    /* < 0x10: reserved control messages */
  91
  92struct nlmsgerr
  93{
  94        int             error;
  95        struct nlmsghdr msg;
  96};
  97
  98#define NETLINK_ADD_MEMBERSHIP  1
  99#define NETLINK_DROP_MEMBERSHIP 2
 100#define NETLINK_PKTINFO         3
 101
 102struct nl_pktinfo
 103{
 104        __u32   group;
 105};
 106
 107#define NET_MAJOR 36            /* Major 36 is reserved for networking                                          */
 108
 109enum {
 110        NETLINK_UNCONNECTED = 0,
 111        NETLINK_CONNECTED,
 112};
 113
 114/*
 115 *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
 116 * +---------------------+- - -+- - - - - - - - - -+- - -+
 117 * |        Header       | Pad |     Payload       | Pad |
 118 * |   (struct nlattr)   | ing |                   | ing |
 119 * +---------------------+- - -+- - - - - - - - - -+- - -+
 120 *  <-------------- nlattr->nla_len -------------->
 121 */
 122
 123struct nlattr
 124{
 125        __u16           nla_len;
 126        __u16           nla_type;
 127};
 128
 129#define NLA_ALIGNTO             4
 130#define NLA_ALIGN(len)          (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
 131#define NLA_HDRLEN              ((int) NLA_ALIGN(sizeof(struct nlattr)))
 132
 133#ifdef __KERNEL__
 134
 135#include <linux/capability.h>
 136#include <linux/skbuff.h>
 137
 138struct netlink_skb_parms
 139{
 140        struct ucred            creds;          /* Skb credentials      */
 141        __u32                   pid;
 142        __u32                   dst_pid;
 143        __u32                   dst_group;
 144        kernel_cap_t            eff_cap;
 145        __u32                   loginuid;       /* Login (audit) uid */
 146        __u32                   sid;            /* SELinux security id */
 147};
 148
 149#define NETLINK_CB(skb)         (*(struct netlink_skb_parms*)&((skb)->cb))
 150#define NETLINK_CREDS(skb)      (&NETLINK_CB((skb)).creds)
 151
 152
 153extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module);
 154extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
 155extern int netlink_has_listeners(struct sock *sk, unsigned int group);
 156extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
 157extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
 158                             __u32 group, gfp_t allocation);
 159extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
 160extern int netlink_register_notifier(struct notifier_block *nb);
 161extern int netlink_unregister_notifier(struct notifier_block *nb);
 162
 163/* finegrained unicast helpers: */
 164struct sock *netlink_getsockbyfilp(struct file *filp);
 165int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
 166                long timeo, struct sock *ssk);
 167void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
 168int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
 169
 170/*
 171 *      skb should fit one page. This choice is good for headerless malloc.
 172 */
 173#define NLMSG_GOODORDER 0
 174#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
 175
 176
 177struct netlink_callback
 178{
 179        struct sk_buff  *skb;
 180        struct nlmsghdr *nlh;
 181        int             (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
 182        int             (*done)(struct netlink_callback *cb);
 183        int             family;
 184        long            args[5];
 185};
 186
 187struct netlink_notify
 188{
 189        int pid;
 190        int protocol;
 191};
 192
 193static __inline__ struct nlmsghdr *
 194__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
 195{
 196        struct nlmsghdr *nlh;
 197        int size = NLMSG_LENGTH(len);
 198
 199        nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
 200        nlh->nlmsg_type = type;
 201        nlh->nlmsg_len = size;
 202        nlh->nlmsg_flags = flags;
 203        nlh->nlmsg_pid = pid;
 204        nlh->nlmsg_seq = seq;
 205        memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
 206        return nlh;
 207}
 208
 209#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
 210({      if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
 211                goto nlmsg_failure; \
 212        __nlmsg_put(skb, pid, seq, type, len, flags); })
 213
 214#define NLMSG_PUT(skb, pid, seq, type, len) \
 215        NLMSG_NEW(skb, pid, seq, type, len, 0)
 216
 217#define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
 218        NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
 219                  (cb)->nlh->nlmsg_seq, type, len, flags)
 220
 221#define NLMSG_END(skb, nlh) \
 222({      (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
 223        (skb)->len; })
 224
 225#define NLMSG_CANCEL(skb, nlh) \
 226({      skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
 227        -1; })
 228
 229extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
 230                              struct nlmsghdr *nlh,
 231                              int (*dump)(struct sk_buff *skb, struct netlink_callback*),
 232                              int (*done)(struct netlink_callback*));
 233
 234
 235#define NL_NONROOT_RECV 0x1
 236#define NL_NONROOT_SEND 0x2
 237extern void netlink_set_nonroot(int protocol, unsigned flag);
 238
 239#endif /* __KERNEL__ */
 240
 241#endif  /* __LINUX_NETLINK_H */
 242