303 lines
8.3 KiB
C
303 lines
8.3 KiB
C
#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_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
|
|
* @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;
|
|
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
|
|
*/
|
|
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
|
|
};
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
static inline struct net *genl_info_net(struct genl_info *info)
|
|
{
|
|
return info->_net;
|
|
}
|
|
|
|
static inline void genl_info_net_set(struct genl_info *info, struct net *net)
|
|
{
|
|
info->_net = net;
|
|
}
|
|
#else
|
|
static inline struct net *genl_info_net(struct genl_info *info)
|
|
{
|
|
return &init_net;
|
|
}
|
|
|
|
static inline void genl_info_net_set(struct genl_info *info, struct net *net)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* 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;
|
|
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);
|
|
|
|
/**
|
|
* 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 void genlmsg_cancel(struct sk_buff *skb, void *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 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 */
|