LCOV - code coverage report
Current view: top level - include/linux - netlink.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 1 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       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             : /* leave room for NETLINK_DM (DM Events) */
      25             : #define NETLINK_SCSITRANSPORT   18      /* SCSI Transports */
      26             : #define NETLINK_ECRYPTFS        19
      27             : 
      28             : #define MAX_LINKS 32            
      29             : 
      30             : struct net;
      31             : 
      32             : struct sockaddr_nl {
      33             :         sa_family_t     nl_family;      /* AF_NETLINK   */
      34             :         unsigned short  nl_pad;         /* zero         */
      35             :         __u32           nl_pid;         /* port ID      */
      36             :         __u32           nl_groups;      /* multicast groups mask */
      37             : };
      38             : 
      39             : struct nlmsghdr {
      40             :         __u32           nlmsg_len;      /* Length of message including header */
      41             :         __u16           nlmsg_type;     /* Message content */
      42             :         __u16           nlmsg_flags;    /* Additional flags */
      43             :         __u32           nlmsg_seq;      /* Sequence number */
      44             :         __u32           nlmsg_pid;      /* Sending process port ID */
      45             : };
      46             : 
      47             : /* Flags values */
      48             : 
      49             : #define NLM_F_REQUEST           1       /* It is request message.       */
      50             : #define NLM_F_MULTI             2       /* Multipart message, terminated by NLMSG_DONE */
      51             : #define NLM_F_ACK               4       /* Reply with ack, with zero or error code */
      52             : #define NLM_F_ECHO              8       /* Echo this request            */
      53             : 
      54             : /* Modifiers to GET request */
      55             : #define NLM_F_ROOT      0x100   /* specify tree root    */
      56             : #define NLM_F_MATCH     0x200   /* return all matching  */
      57             : #define NLM_F_ATOMIC    0x400   /* atomic GET           */
      58             : #define NLM_F_DUMP      (NLM_F_ROOT|NLM_F_MATCH)
      59             : 
      60             : /* Modifiers to NEW request */
      61             : #define NLM_F_REPLACE   0x100   /* Override existing            */
      62             : #define NLM_F_EXCL      0x200   /* Do not touch, if it exists   */
      63             : #define NLM_F_CREATE    0x400   /* Create, if it does not exist */
      64             : #define NLM_F_APPEND    0x800   /* Add to end of list           */
      65             : 
      66             : /*
      67             :    4.4BSD ADD           NLM_F_CREATE|NLM_F_EXCL
      68             :    4.4BSD CHANGE        NLM_F_REPLACE
      69             : 
      70             :    True CHANGE          NLM_F_CREATE|NLM_F_REPLACE
      71             :    Append               NLM_F_CREATE
      72             :    Check                NLM_F_EXCL
      73             :  */
      74             : 
      75             : #define NLMSG_ALIGNTO   4
      76             : #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
      77             : #define NLMSG_HDRLEN     ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
      78             : #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
      79             : #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
      80             : #define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
      81             : #define NLMSG_NEXT(nlh,len)      ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
      82             :                                   (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
      83             : #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
      84             :                            (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
      85             :                            (nlh)->nlmsg_len <= (len))
      86             : #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
      87             : 
      88             : #define NLMSG_NOOP              0x1     /* Nothing.             */
      89             : #define NLMSG_ERROR             0x2     /* Error                */
      90             : #define NLMSG_DONE              0x3     /* End of a dump        */
      91             : #define NLMSG_OVERRUN           0x4     /* Data lost            */
      92             : 
      93             : #define NLMSG_MIN_TYPE          0x10    /* < 0x10: reserved control messages */
      94             : 
      95             : struct nlmsgerr {
      96             :         int             error;
      97             :         struct nlmsghdr msg;
      98             : };
      99             : 
     100             : #define NETLINK_ADD_MEMBERSHIP  1
     101             : #define NETLINK_DROP_MEMBERSHIP 2
     102             : #define NETLINK_PKTINFO         3
     103             : #define NETLINK_BROADCAST_ERROR 4
     104             : #define NETLINK_NO_ENOBUFS      5
     105             : 
     106             : struct nl_pktinfo {
     107             :         __u32   group;
     108             : };
     109             : 
     110             : #define NET_MAJOR 36            /* Major 36 is reserved for networking                                          */
     111             : 
     112             : enum {
     113             :         NETLINK_UNCONNECTED = 0,
     114           1 :         NETLINK_CONNECTED,
     115             : };
     116             : 
     117             : /*
     118             :  *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
     119             :  * +---------------------+- - -+- - - - - - - - - -+- - -+
     120             :  * |        Header       | Pad |     Payload       | Pad |
     121             :  * |   (struct nlattr)   | ing |                   | ing |
     122             :  * +---------------------+- - -+- - - - - - - - - -+- - -+
     123             :  *  <-------------- nlattr->nla_len -------------->
     124             :  */
     125             : 
     126             : struct nlattr {
     127             :         __u16           nla_len;
     128             :         __u16           nla_type;
     129             : };
     130             : 
     131             : /*
     132             :  * nla_type (16 bits)
     133             :  * +---+---+-------------------------------+
     134             :  * | N | O | Attribute Type                |
     135             :  * +---+---+-------------------------------+
     136             :  * N := Carries nested attributes
     137             :  * O := Payload stored in network byte order
     138             :  *
     139             :  * Note: The N and O flag are mutually exclusive.
     140             :  */
     141             : #define NLA_F_NESTED            (1 << 15)
     142             : #define NLA_F_NET_BYTEORDER     (1 << 14)
     143             : #define NLA_TYPE_MASK           ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
     144             : 
     145             : #define NLA_ALIGNTO             4
     146             : #define NLA_ALIGN(len)          (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
     147             : #define NLA_HDRLEN              ((int) NLA_ALIGN(sizeof(struct nlattr)))
     148             : 
     149             : #ifdef __KERNEL__
     150             : 
     151             : #include <linux/capability.h>
     152             : #include <linux/skbuff.h>
     153             : 
     154             : static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
     155             : {
     156             :         return (struct nlmsghdr *)skb->data;
     157             : }
     158             : 
     159             : struct netlink_skb_parms {
     160             :         struct ucred            creds;          /* Skb credentials      */
     161             :         __u32                   pid;
     162             :         __u32                   dst_group;
     163             :         kernel_cap_t            eff_cap;
     164             :         __u32                   loginuid;       /* Login (audit) uid */
     165             :         __u32                   sessionid;      /* Session id (audit) */
     166             :         __u32                   sid;            /* SELinux security id */
     167             : };
     168             : 
     169             : #define NETLINK_CB(skb)         (*(struct netlink_skb_parms*)&((skb)->cb))
     170             : #define NETLINK_CREDS(skb)      (&NETLINK_CB((skb)).creds)
     171             : 
     172             : 
     173             : extern void netlink_table_grab(void);
     174             : extern void netlink_table_ungrab(void);
     175             : 
     176             : extern struct sock *netlink_kernel_create(struct net *net,
     177             :                                           int unit,unsigned int groups,
     178             :                                           void (*input)(struct sk_buff *skb),
     179             :                                           struct mutex *cb_mutex,
     180             :                                           struct module *module);
     181             : extern void netlink_kernel_release(struct sock *sk);
     182             : extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
     183             : extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
     184             : extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
     185             : extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group);
     186             : extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
     187             : extern int netlink_has_listeners(struct sock *sk, unsigned int group);
     188             : extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
     189             : extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
     190             :                              __u32 group, gfp_t allocation);
     191             : extern int netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
     192             : extern int netlink_register_notifier(struct notifier_block *nb);
     193             : extern int netlink_unregister_notifier(struct notifier_block *nb);
     194             : 
     195             : /* finegrained unicast helpers: */
     196             : struct sock *netlink_getsockbyfilp(struct file *filp);
     197             : int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
     198             :                       long *timeo, struct sock *ssk);
     199             : void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
     200             : int netlink_sendskb(struct sock *sk, struct sk_buff *skb);
     201             : 
     202             : /*
     203             :  *      skb should fit one page. This choice is good for headerless malloc.
     204             :  *      But we should limit to 8K so that userspace does not have to
     205             :  *      use enormous buffer sizes on recvmsg() calls just to avoid
     206             :  *      MSG_TRUNC when PAGE_SIZE is very large.
     207             :  */
     208             : #if PAGE_SIZE < 8192UL
     209             : #define NLMSG_GOODSIZE  SKB_WITH_OVERHEAD(PAGE_SIZE)
     210             : #else
     211             : #define NLMSG_GOODSIZE  SKB_WITH_OVERHEAD(8192UL)
     212             : #endif
     213             : 
     214             : #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
     215             : 
     216             : 
     217             : struct netlink_callback {
     218             :         struct sk_buff          *skb;
     219             :         const struct nlmsghdr   *nlh;
     220             :         int                     (*dump)(struct sk_buff * skb,
     221             :                                         struct netlink_callback *cb);
     222             :         int                     (*done)(struct netlink_callback *cb);
     223             :         int                     family;
     224             :         long                    args[6];
     225             : };
     226             : 
     227             : struct netlink_notify {
     228             :         struct net *net;
     229             :         int pid;
     230             :         int protocol;
     231             : };
     232             : 
     233             : static __inline__ struct nlmsghdr *
     234             : __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
     235             : {
     236             :         struct nlmsghdr *nlh;
     237             :         int size = NLMSG_LENGTH(len);
     238             : 
     239             :         nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
     240             :         nlh->nlmsg_type = type;
     241             :         nlh->nlmsg_len = size;
     242             :         nlh->nlmsg_flags = flags;
     243             :         nlh->nlmsg_pid = pid;
     244             :         nlh->nlmsg_seq = seq;
     245             :         if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0)
     246             :                 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
     247             :         return nlh;
     248             : }
     249             : 
     250             : #define NLMSG_NEW(skb, pid, seq, type, len, flags) \
     251             : ({      if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \
     252             :                 goto nlmsg_failure; \
     253             :         __nlmsg_put(skb, pid, seq, type, len, flags); })
     254             : 
     255             : #define NLMSG_PUT(skb, pid, seq, type, len) \
     256             :         NLMSG_NEW(skb, pid, seq, type, len, 0)
     257             : 
     258             : extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
     259             :                               const struct nlmsghdr *nlh,
     260             :                               int (*dump)(struct sk_buff *skb, struct netlink_callback*),
     261             :                               int (*done)(struct netlink_callback*));
     262             : 
     263             : 
     264             : #define NL_NONROOT_RECV 0x1
     265             : #define NL_NONROOT_SEND 0x2
     266             : extern void netlink_set_nonroot(int protocol, unsigned flag);
     267             : 
     268             : #endif /* __KERNEL__ */
     269             : 
     270             : #endif  /* __LINUX_NETLINK_H */

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