#ifndef __NET_GENERIC_NETLINK_H#define __NET_GENERIC_NETLINK_H #include <linux/genetlink.h>#include <net/netlink.h> /** * struct genl_family - generic netlink family * @id: protocol family idenfitier * @hdrsize: length of user specific header in bytes * @name: name of family * @version: protocol version * @maxattr: maximum number of attributes supported * @attrbuf: buffer to store parsed attributes * @ops_list: list of all assigned operations * @family_list: family list */struct genl_family{	unsigned int		id;	unsigned int		hdrsize;	char			name[GENL_NAMSIZ];	unsigned int		version;	unsigned int		maxattr;	struct nlattr **	attrbuf;	/* private */	struct list_head	ops_list;	/* private */	struct list_head	family_list;	/* private */}; /** * struct genl_info - receiving information * @snd_seq: sending sequence number * @snd_pid: netlink pid of sender * @nlhdr: netlink message header * @genlhdr: generic netlink message header * @userhdr: user specific header * @attrs: netlink attributes */struct genl_info{	u32			snd_seq;	u32			snd_pid;	struct nlmsghdr *	nlhdr;	struct genlmsghdr *	genlhdr;	void *			userhdr;	struct nlattr **	attrs;}; /** * struct genl_ops - generic netlink operations * @cmd: command identifier * @flags: flags * @policy: attribute validation policy * @doit: standard command callback * @dumpit: callback for dumpers * @done: completion callback for dumps * @ops_list: operations list */struct genl_ops{	u8			cmd;	unsigned int		flags;	struct nla_policy	*policy;	int		       (*doit)(struct sk_buff *skb,				       struct genl_info *info);	int		       (*dumpit)(struct sk_buff *skb,					 struct netlink_callback *cb);	int		       (*done)(struct netlink_callback *cb);	struct list_head	ops_list;}; extern int genl_register_family(struct genl_family *family);extern int genl_unregister_family(struct genl_family *family);extern int genl_register_ops(struct genl_family *, struct genl_ops *ops);extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops); extern struct sock *genl_sock; /** * genlmsg_put - Add generic netlink header to netlink message * @skb: socket buffer holding the message * @pid: netlink pid the message is addressed to * @seq: sequence number (usually the one of the sender) * @family: generic netlink family * @flags netlink message flags * @cmd: generic netlink command * * Returns pointer to user specific header */static inline void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq,				struct genl_family *family, int flags, u8 cmd){	struct nlmsghdr *nlh;	struct genlmsghdr *hdr; 	nlh = nlmsg_put(skb, pid, seq, family->id, GENL_HDRLEN +			family->hdrsize, flags);	if (nlh == NULL)		return NULL; 	hdr = nlmsg_data(nlh);	hdr->cmd = cmd;	hdr->version = family->version;	hdr->reserved = 0; 	return (char *) hdr + GENL_HDRLEN;} /** * genlmsg_put_reply - Add generic netlink header to a reply message * @skb: socket buffer holding the message * @info: receiver info * @family: generic netlink family * @flags: netlink message flags * @cmd: generic netlink command * * Returns pointer to user specific header */static inline void *genlmsg_put_reply(struct sk_buff *skb,				      struct genl_info *info,				      struct genl_family *family,				      int flags, u8 cmd){	return genlmsg_put(skb, info->snd_pid, info->snd_seq, family,			   flags, cmd);} /** * genlmsg_end - Finalize a generic netlink message * @skb: socket buffer the message is stored in * @hdr: user specific header */static inline int genlmsg_end(struct sk_buff *skb, void *hdr){	return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);} /** * genlmsg_cancel - Cancel construction of a generic netlink message * @skb: socket buffer the message is stored in * @hdr: generic netlink message header */static inline int genlmsg_cancel(struct sk_buff *skb, void *hdr){	return nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);} /** * genlmsg_multicast - multicast a netlink message * @skb: netlink message as socket buffer * @pid: own netlink pid to avoid sending to yourself * @group: multicast group id * @flags: allocation flags */static inline int genlmsg_multicast(struct sk_buff *skb, u32 pid,				    unsigned int group, gfp_t flags){	return nlmsg_multicast(genl_sock, skb, pid, group, flags);} /** * genlmsg_unicast - unicast a netlink message * @skb: netlink message as socket buffer * @pid: netlink pid of the destination socket */static inline int genlmsg_unicast(struct sk_buff *skb, u32 pid){	return nlmsg_unicast(genl_sock, skb, pid);} /** * genlmsg_reply - reply to a request * @skb: netlink message to be sent back * @info: receiver information */static inline int genlmsg_reply(struct sk_buff *skb, struct genl_info *info){	return genlmsg_unicast(skb, info->snd_pid);} /** * gennlmsg_data - head of message payload * @gnlh: genetlink messsage header */static inline void *genlmsg_data(const struct genlmsghdr *gnlh){	return ((unsigned char *) gnlh + GENL_HDRLEN);} /** * genlmsg_len - length of message payload * @gnlh: genetlink message header */static inline int genlmsg_len(const struct genlmsghdr *gnlh){	struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh -							NLMSG_HDRLEN);	return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);} /** * genlmsg_msg_size - length of genetlink message not including padding * @payload: length of message payload */static inline int genlmsg_msg_size(int payload){	return GENL_HDRLEN + payload;} /** * genlmsg_total_size - length of genetlink message including padding * @payload: length of message payload */static inline int genlmsg_total_size(int payload){	return NLMSG_ALIGN(genlmsg_msg_size(payload));} /** * genlmsg_new - Allocate a new generic netlink message * @payload: size of the message payload * @flags: the type of memory to allocate. */static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags){	return nlmsg_new(genlmsg_total_size(payload), flags);}  #endif	/* __NET_GENERIC_NETLINK_H */