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netlink.h

#ifndef __LINUX_NETLINK_H
#define __LINUX_NETLINK_H

#include <linux/socket.h> /* for sa_family_t */

#define NETLINK_ROUTE         0     /* Routing/device hook                    */
#define NETLINK_SKIP          1     /* Reserved for ENskip                    */
#define NETLINK_USERSOCK      2     /* Reserved for user mode socket protocols      */
#define NETLINK_FIREWALL      3     /* Firewalling hook                       */
#define NETLINK_TCPDIAG       4     /* TCP socket monitoring                  */
#define NETLINK_NFLOG         5     /* netfilter/iptables ULOG */
#define NETLINK_XFRM          6     /* ipsec */
#define NETLINK_ARPD          8
#define NETLINK_ROUTE6        11    /* af_inet6 route comm channel */
#define NETLINK_IP6_FW        13
#define NETLINK_DNRTMSG       14    /* DECnet routing messages */
#define NETLINK_TAPBASE       16    /* 16 to 31 are ethertap */

#define MAX_LINKS 32          

struct sockaddr_nl
{
      sa_family_t nl_family;  /* AF_NETLINK     */
      unsigned short    nl_pad;           /* zero           */
      __u32       nl_pid;           /* process pid    */
            __u32       nl_groups;  /* multicast groups mask */
};

struct nlmsghdr
{
      __u32       nlmsg_len;  /* Length of message including header */
      __u16       nlmsg_type; /* Message content */
      __u16       nlmsg_flags;      /* Additional flags */
      __u32       nlmsg_seq;  /* Sequence number */
      __u32       nlmsg_pid;  /* Sending process PID */
};

/* Flags values */

#define NLM_F_REQUEST         1     /* It is request message.     */
#define NLM_F_MULTI           2     /* Multipart message, terminated by NLMSG_DONE */
#define NLM_F_ACK       4     /* Reply with ack, with zero or error code */
#define NLM_F_ECHO            8     /* Echo this request          */

/* Modifiers to GET request */
#define NLM_F_ROOT      0x100 /* specify tree   root  */
#define NLM_F_MATCH     0x200 /* return all matching  */
#define NLM_F_ATOMIC    0x400 /* atomic GET           */
#define NLM_F_DUMP      (NLM_F_ROOT|NLM_F_MATCH)

/* Modifiers to NEW request */
#define NLM_F_REPLACE   0x100 /* Override existing          */
#define NLM_F_EXCL      0x200 /* Do not touch, if it exists */
#define NLM_F_CREATE    0x400 /* Create, if it does not exist     */
#define NLM_F_APPEND    0x800 /* Add to end of list         */

/*
   4.4BSD ADD           NLM_F_CREATE|NLM_F_EXCL
   4.4BSD CHANGE  NLM_F_REPLACE

   True CHANGE          NLM_F_CREATE|NLM_F_REPLACE
   Append         NLM_F_CREATE
   Check          NLM_F_EXCL
 */

#define NLMSG_ALIGNTO   4
#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
#define NLMSG_NEXT(nlh,len)    ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
                          (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
#define NLMSG_OK(nlh,len) ((len) > 0 && (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
                     (nlh)->nlmsg_len <= (len))
#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))

#define NLMSG_NOOP            0x1   /* Nothing.       */
#define NLMSG_ERROR           0x2   /* Error          */
#define NLMSG_DONE            0x3   /* End of a dump  */
#define NLMSG_OVERRUN         0x4   /* Data lost            */

struct nlmsgerr
{
      int         error;
      struct nlmsghdr msg;
};

#define NET_MAJOR 36          /* Major 36 is reserved for networking                                  */

#ifdef __KERNEL__

#include <linux/capability.h>
#include <linux/skbuff.h>

struct netlink_skb_parms
{
      struct ucred            creds;            /* Skb credentials      */
      __u32             pid;
      __u32             groups;
      __u32             dst_pid;
      __u32             dst_groups;
      kernel_cap_t            eff_cap;
};

#define NETLINK_CB(skb)       (*(struct netlink_skb_parms*)&((skb)->cb))
#define NETLINK_CREDS(skb)    (&NETLINK_CB((skb)).creds)


extern int netlink_attach(int unit, int (*function)(int,struct sk_buff *skb));
extern void netlink_detach(int unit);
extern int netlink_post(int unit, struct sk_buff *skb);
extern int init_netlink(void);
extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len));
extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
                       __u32 group, int allocation);
extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
extern int netlink_register_notifier(struct notifier_block *nb);
extern int netlink_unregister_notifier(struct notifier_block *nb);

/*
 *    skb should fit one page. This choice is good for headerless malloc.
 *
 *      FIXME: What is the best size for SLAB???? --ANK
 */
#define NLMSG_GOODSIZE (PAGE_SIZE - ((sizeof(struct sk_buff)+0xF)&~0xF))


struct netlink_callback
{
      struct sk_buff    *skb;
      struct nlmsghdr   *nlh;
      int         (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
      int         (*done)(struct netlink_callback *cb);
      int         family;
      long        args[4];
};

struct netlink_notify
{
      int pid;
      int protocol;
};

static __inline__ struct nlmsghdr *
__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len)
{
      struct nlmsghdr *nlh;
      int size = NLMSG_LENGTH(len);

      nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
      nlh->nlmsg_type = type;
      nlh->nlmsg_len = size;
      nlh->nlmsg_flags = 0;
      nlh->nlmsg_pid = pid;
      nlh->nlmsg_seq = seq;
      return nlh;
}

#define NLMSG_PUT(skb, pid, seq, type, len) \
({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) goto nlmsg_failure; \
   __nlmsg_put(skb, pid, seq, type, len); })

extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
                        struct nlmsghdr *nlh,
                        int (*dump)(struct sk_buff *skb, struct netlink_callback*),
                        int (*done)(struct netlink_callback*));

#define NL_NONROOT_RECV 0x1
#define NL_NONROOT_SEND 0x2
extern void netlink_set_nonroot(int protocol, unsigned flag);


#endif /* __KERNEL__ */

#endif      /* __LINUX_NETLINK_H */

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