mirror of https://gitee.com/openkylin/linux.git
154 lines
4.0 KiB
C
154 lines
4.0 KiB
C
#ifndef __NET_GENERIC_NETLINK_H
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#define __NET_GENERIC_NETLINK_H
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#include <linux/genetlink.h>
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#include <net/netlink.h>
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/**
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* struct genl_family - generic netlink family
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* @id: protocol family idenfitier
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* @hdrsize: length of user specific header in bytes
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* @name: name of family
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* @version: protocol version
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* @maxattr: maximum number of attributes supported
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* @attrbuf: buffer to store parsed attributes
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* @ops_list: list of all assigned operations
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* @family_list: family list
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*/
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struct genl_family
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{
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unsigned int id;
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unsigned int hdrsize;
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char name[GENL_NAMSIZ];
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unsigned int version;
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unsigned int maxattr;
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struct nlattr ** attrbuf; /* private */
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struct list_head ops_list; /* private */
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struct list_head family_list; /* private */
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};
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#define GENL_ADMIN_PERM 0x01
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/**
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* struct genl_info - receiving information
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* @snd_seq: sending sequence number
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* @snd_pid: netlink pid of sender
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* @nlhdr: netlink message header
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* @genlhdr: generic netlink message header
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* @userhdr: user specific header
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* @attrs: netlink attributes
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*/
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struct genl_info
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{
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u32 snd_seq;
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u32 snd_pid;
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struct nlmsghdr * nlhdr;
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struct genlmsghdr * genlhdr;
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void * userhdr;
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struct nlattr ** attrs;
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};
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/**
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* struct genl_ops - generic netlink operations
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* @cmd: command identifier
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* @flags: flags
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* @policy: attribute validation policy
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* @doit: standard command callback
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* @dumpit: callback for dumpers
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* @ops_list: operations list
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*/
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struct genl_ops
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{
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u8 cmd;
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unsigned int flags;
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struct nla_policy *policy;
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int (*doit)(struct sk_buff *skb,
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struct genl_info *info);
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int (*dumpit)(struct sk_buff *skb,
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struct netlink_callback *cb);
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struct list_head ops_list;
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};
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extern int genl_register_family(struct genl_family *family);
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extern int genl_unregister_family(struct genl_family *family);
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extern int genl_register_ops(struct genl_family *, struct genl_ops *ops);
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extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops);
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extern struct sock *genl_sock;
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/**
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* genlmsg_put - Add generic netlink header to netlink message
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* @skb: socket buffer holding the message
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* @pid: netlink pid the message is addressed to
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* @seq: sequence number (usually the one of the sender)
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* @type: netlink message type
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* @hdrlen: length of the user specific header
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* @flags netlink message flags
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* @cmd: generic netlink command
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* @version: version
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*
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* Returns pointer to user specific header
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*/
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static inline void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq,
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int type, int hdrlen, int flags,
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u8 cmd, u8 version)
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{
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struct nlmsghdr *nlh;
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struct genlmsghdr *hdr;
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nlh = nlmsg_put(skb, pid, seq, type, GENL_HDRLEN + hdrlen, flags);
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if (nlh == NULL)
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return NULL;
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hdr = nlmsg_data(nlh);
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hdr->cmd = cmd;
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hdr->version = version;
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hdr->reserved = 0;
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return (char *) hdr + GENL_HDRLEN;
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}
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/**
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* genlmsg_end - Finalize a generic netlink message
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* @skb: socket buffer the message is stored in
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* @hdr: user specific header
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*/
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static inline int genlmsg_end(struct sk_buff *skb, void *hdr)
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{
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return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
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}
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/**
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* genlmsg_cancel - Cancel construction of a generic netlink message
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* @skb: socket buffer the message is stored in
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* @hdr: generic netlink message header
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*/
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static inline int genlmsg_cancel(struct sk_buff *skb, void *hdr)
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{
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return nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
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}
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/**
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* genlmsg_multicast - multicast a netlink message
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* @skb: netlink message as socket buffer
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* @pid: own netlink pid to avoid sending to yourself
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* @group: multicast group id
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*/
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static inline int genlmsg_multicast(struct sk_buff *skb, u32 pid,
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unsigned int group)
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{
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return nlmsg_multicast(genl_sock, skb, pid, group);
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}
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/**
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* genlmsg_unicast - unicast a netlink message
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* @skb: netlink message as socket buffer
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* @pid: netlink pid of the destination socket
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*/
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static inline int genlmsg_unicast(struct sk_buff *skb, u32 pid)
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{
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return nlmsg_unicast(genl_sock, skb, pid);
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}
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#endif /* __NET_GENERIC_NETLINK_H */
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