ff2b94d2c3
There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
336 lines
9.7 KiB
C
336 lines
9.7 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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#include <net/net_namespace.h>
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#define GENLMSG_DEFAULT_SIZE (NLMSG_DEFAULT_SIZE - GENL_HDRLEN)
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/**
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* struct genl_multicast_group - generic netlink multicast group
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* @name: name of the multicast group, names are per-family
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* @id: multicast group ID, assigned by the core, to use with
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* genlmsg_multicast().
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* @list: list entry for linking
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* @family: pointer to family, need not be set before registering
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*/
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struct genl_multicast_group {
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struct genl_family *family; /* private */
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struct list_head list; /* private */
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char name[GENL_NAMSIZ];
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u32 id;
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};
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struct genl_ops;
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struct genl_info;
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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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* @netnsok: set to true if the family can handle network
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* namespaces and should be presented in all of them
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* @pre_doit: called before an operation's doit callback, it may
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* do additional, common, filtering and return an error
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* @post_doit: called after an operation's doit callback, it may
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* undo operations done by pre_doit, for example release locks
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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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* @mcast_groups: multicast groups list
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*/
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struct genl_family {
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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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bool netnsok;
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bool parallel_ops;
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int (*pre_doit)(struct genl_ops *ops,
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struct sk_buff *skb,
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struct genl_info *info);
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void (*post_doit)(struct genl_ops *ops,
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struct sk_buff *skb,
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struct genl_info *info);
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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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struct list_head mcast_groups; /* private */
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struct module *module;
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};
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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_portid: netlink portid 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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* @_net: network namespace
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* @user_ptr: user pointers
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*/
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struct genl_info {
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u32 snd_seq;
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u32 snd_portid;
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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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#ifdef CONFIG_NET_NS
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struct net * _net;
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#endif
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void * user_ptr[2];
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};
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static inline struct net *genl_info_net(struct genl_info *info)
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{
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return read_pnet(&info->_net);
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}
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static inline void genl_info_net_set(struct genl_info *info, struct net *net)
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{
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write_pnet(&info->_net, net);
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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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* @internal_flags: flags used by the family
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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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* @done: completion callback for dumps
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* @ops_list: operations list
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*/
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struct genl_ops {
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u8 cmd;
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u8 internal_flags;
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unsigned int flags;
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const 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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int (*done)(struct netlink_callback *cb);
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struct list_head ops_list;
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};
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int __genl_register_family(struct genl_family *family);
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static inline int genl_register_family(struct genl_family *family)
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{
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family->module = THIS_MODULE;
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return __genl_register_family(family);
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}
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int __genl_register_family_with_ops(struct genl_family *family,
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struct genl_ops *ops, size_t n_ops);
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static inline int genl_register_family_with_ops(struct genl_family *family,
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struct genl_ops *ops, size_t n_ops)
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{
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family->module = THIS_MODULE;
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return __genl_register_family_with_ops(family, ops, n_ops);
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}
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int genl_unregister_family(struct genl_family *family);
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int genl_register_ops(struct genl_family *, struct genl_ops *ops);
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int genl_unregister_ops(struct genl_family *, struct genl_ops *ops);
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int genl_register_mc_group(struct genl_family *family,
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struct genl_multicast_group *grp);
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void genl_unregister_mc_group(struct genl_family *family,
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struct genl_multicast_group *grp);
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void genl_notify(struct sk_buff *skb, struct net *net, u32 portid,
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u32 group, struct nlmsghdr *nlh, gfp_t flags);
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void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
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struct genl_family *family, int flags, u8 cmd);
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/**
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* genlmsg_nlhdr - Obtain netlink header from user specified header
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* @user_hdr: user header as returned from genlmsg_put()
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* @family: generic netlink family
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*
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* Returns pointer to netlink header.
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*/
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static inline struct nlmsghdr *genlmsg_nlhdr(void *user_hdr,
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struct genl_family *family)
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{
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return (struct nlmsghdr *)((char *)user_hdr -
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family->hdrsize -
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GENL_HDRLEN -
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NLMSG_HDRLEN);
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}
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/**
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* genl_dump_check_consistent - check if sequence is consistent and advertise if not
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* @cb: netlink callback structure that stores the sequence number
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* @user_hdr: user header as returned from genlmsg_put()
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* @family: generic netlink family
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*
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* Cf. nl_dump_check_consistent(), this just provides a wrapper to make it
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* simpler to use with generic netlink.
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*/
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static inline void genl_dump_check_consistent(struct netlink_callback *cb,
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void *user_hdr,
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struct genl_family *family)
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{
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nl_dump_check_consistent(cb, genlmsg_nlhdr(user_hdr, family));
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}
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/**
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* genlmsg_put_reply - Add generic netlink header to a reply message
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* @skb: socket buffer holding the message
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* @info: receiver info
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* @family: generic netlink family
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* @flags: netlink message flags
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* @cmd: generic netlink command
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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_reply(struct sk_buff *skb,
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struct genl_info *info,
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struct genl_family *family,
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int flags, u8 cmd)
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{
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return genlmsg_put(skb, info->snd_portid, info->snd_seq, family,
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flags, cmd);
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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 void genlmsg_cancel(struct sk_buff *skb, void *hdr)
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{
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if (hdr)
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nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
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}
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/**
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* genlmsg_multicast_netns - multicast a netlink message to a specific netns
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* @net: the net namespace
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* @skb: netlink message as socket buffer
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* @portid: own netlink portid to avoid sending to yourself
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* @group: multicast group id
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* @flags: allocation flags
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*/
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static inline int genlmsg_multicast_netns(struct net *net, struct sk_buff *skb,
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u32 portid, unsigned int group, gfp_t flags)
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{
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return nlmsg_multicast(net->genl_sock, skb, portid, group, flags);
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}
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/**
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* genlmsg_multicast - multicast a netlink message to the default netns
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* @skb: netlink message as socket buffer
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* @portid: own netlink portid to avoid sending to yourself
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* @group: multicast group id
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* @flags: allocation flags
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*/
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static inline int genlmsg_multicast(struct sk_buff *skb, u32 portid,
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unsigned int group, gfp_t flags)
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{
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return genlmsg_multicast_netns(&init_net, skb, portid, group, flags);
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}
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/**
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* genlmsg_multicast_allns - multicast a netlink message to all net namespaces
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* @skb: netlink message as socket buffer
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* @portid: own netlink portid to avoid sending to yourself
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* @group: multicast group id
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* @flags: allocation flags
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*
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* This function must hold the RTNL or rcu_read_lock().
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*/
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int genlmsg_multicast_allns(struct sk_buff *skb, u32 portid,
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unsigned int group, gfp_t flags);
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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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* @portid: netlink portid of the destination socket
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*/
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static inline int genlmsg_unicast(struct net *net, struct sk_buff *skb, u32 portid)
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{
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return nlmsg_unicast(net->genl_sock, skb, portid);
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}
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/**
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* genlmsg_reply - reply to a request
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* @skb: netlink message to be sent back
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* @info: receiver information
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*/
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static inline int genlmsg_reply(struct sk_buff *skb, struct genl_info *info)
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{
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return genlmsg_unicast(genl_info_net(info), skb, info->snd_portid);
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}
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/**
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* gennlmsg_data - head of message payload
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* @gnlh: genetlink message header
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*/
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static inline void *genlmsg_data(const struct genlmsghdr *gnlh)
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{
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return ((unsigned char *) gnlh + GENL_HDRLEN);
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}
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/**
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* genlmsg_len - length of message payload
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* @gnlh: genetlink message header
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*/
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static inline int genlmsg_len(const struct genlmsghdr *gnlh)
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{
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struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh -
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NLMSG_HDRLEN);
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return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);
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}
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/**
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* genlmsg_msg_size - length of genetlink message not including padding
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* @payload: length of message payload
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*/
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static inline int genlmsg_msg_size(int payload)
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{
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return GENL_HDRLEN + payload;
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}
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/**
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* genlmsg_total_size - length of genetlink message including padding
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* @payload: length of message payload
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*/
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static inline int genlmsg_total_size(int payload)
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{
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return NLMSG_ALIGN(genlmsg_msg_size(payload));
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}
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/**
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* genlmsg_new - Allocate a new generic netlink message
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* @payload: size of the message payload
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* @flags: the type of memory to allocate.
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*/
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static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags)
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{
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return nlmsg_new(genlmsg_total_size(payload), flags);
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}
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#endif /* __NET_GENERIC_NETLINK_H */
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