#ifndef __NET_GENERIC_NETLINK_H#define __NET_GENERIC_NETLINK_H #include <linux/genetlink.h>#include <net/netlink.h>#include <net/net_namespace.h> /** * struct genl_multicast_group - generic netlink multicast group * @name: name of the multicast group, names are per-family * @id: multicast group ID, assigned by the core, to use with *      genlmsg_multicast(). * @list: list entry for linking * @family: pointer to family, need not be set before registering */struct genl_multicast_group {	struct genl_family	*family;	/* private */	struct list_head	list;		/* private */	char			name[GENL_NAMSIZ];	u32			id;}; struct genl_ops;struct genl_info; /** * 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 * @netnsok: set to true if the family can handle network *	namespaces and should be presented in all of them * @pre_doit: called before an operation's doit callback, it may *	do additional, common, filtering and return an error * @post_doit: called after an operation's doit callback, it may *	undo operations done by pre_doit, for example release locks * @attrbuf: buffer to store parsed attributes * @ops_list: list of all assigned operations * @family_list: family list * @mcast_groups: multicast groups list */struct genl_family {	unsigned int		id;	unsigned int		hdrsize;	char			name[GENL_NAMSIZ];	unsigned int		version;	unsigned int		maxattr;	bool			netnsok;	int			(*pre_doit)(struct genl_ops *ops,					    struct sk_buff *skb,					    struct genl_info *info);	void			(*post_doit)(struct genl_ops *ops,					     struct sk_buff *skb,					     struct genl_info *info);	struct nlattr **	attrbuf;	/* private */	struct list_head	ops_list;	/* private */	struct list_head	family_list;	/* private */	struct list_head	mcast_groups;	/* 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 * @_net: network namespace * @user_ptr: user pointers */struct genl_info {	u32			snd_seq;	u32			snd_pid;	struct nlmsghdr *	nlhdr;	struct genlmsghdr *	genlhdr;	void *			userhdr;	struct nlattr **	attrs;#ifdef CONFIG_NET_NS	struct net *		_net;#endif	void *			user_ptr[2];}; static inline struct net *genl_info_net(struct genl_info *info){	return read_pnet(&info->_net);} static inline void genl_info_net_set(struct genl_info *info, struct net *net){	write_pnet(&info->_net, net);} /** * struct genl_ops - generic netlink operations * @cmd: command identifier * @internal_flags: flags used by the family * @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;	u8			internal_flags;	unsigned int		flags;	const 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_register_family_with_ops(struct genl_family *family,	struct genl_ops *ops, size_t n_ops);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 int genl_register_mc_group(struct genl_family *family,				  struct genl_multicast_group *grp);extern void genl_unregister_mc_group(struct genl_family *family,				     struct genl_multicast_group *grp);extern void genl_notify(struct sk_buff *skb, struct net *net, u32 pid,			u32 group, struct nlmsghdr *nlh, gfp_t flags); void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq,				struct genl_family *family, int flags, u8 cmd); /** * genlmsg_nlhdr - Obtain netlink header from user specified header * @user_hdr: user header as returned from genlmsg_put() * @family: generic netlink family * * Returns pointer to netlink header. */static inline struct nlmsghdr *genlmsg_nlhdr(void *user_hdr,					     struct genl_family *family){	return (struct nlmsghdr *)((char *)user_hdr -				   family->hdrsize -				   GENL_HDRLEN -				   NLMSG_HDRLEN);} /** * genl_dump_check_consistent - check if sequence is consistent and advertise if not * @cb: netlink callback structure that stores the sequence number * @user_hdr: user header as returned from genlmsg_put() * @family: generic netlink family * * Cf. nl_dump_check_consistent(), this just provides a wrapper to make it * simpler to use with generic netlink. */static inline void genl_dump_check_consistent(struct netlink_callback *cb,					      void *user_hdr,					      struct genl_family *family){	nl_dump_check_consistent(cb, genlmsg_nlhdr(user_hdr, family));} /** * 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 void genlmsg_cancel(struct sk_buff *skb, void *hdr){	if (hdr)		nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);} /** * genlmsg_multicast_netns - multicast a netlink message to a specific netns * @net: the net namespace * @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_netns(struct net *net, struct sk_buff *skb,					  u32 pid, unsigned int group, gfp_t flags){	return nlmsg_multicast(net->genl_sock, skb, pid, group, flags);} /** * genlmsg_multicast - multicast a netlink message to the default netns * @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 genlmsg_multicast_netns(&init_net, skb, pid, group, flags);} /** * genlmsg_multicast_allns - multicast a netlink message to all net namespaces * @skb: netlink message as socket buffer * @pid: own netlink pid to avoid sending to yourself * @group: multicast group id * @flags: allocation flags * * This function must hold the RTNL or rcu_read_lock(). */int genlmsg_multicast_allns(struct sk_buff *skb, u32 pid,			    unsigned int group, gfp_t 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 net *net, struct sk_buff *skb, u32 pid){	return nlmsg_unicast(net->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(genl_info_net(info), skb, info->snd_pid);} /** * gennlmsg_data - head of message payload * @gnlh: genetlink message 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 */