#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
* @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
-{
+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 */
};
/**
* @userhdr: user specific header
* @attrs: netlink attributes
*/
-struct genl_info
-{
+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
* @policy: attribute validation policy
* @doit: standard command callback
* @dumpit: callback for dumpers
+ * @done: completion callback for dumps
* @ops_list: operations list
*/
-struct genl_ops
-{
+struct genl_ops {
u8 cmd;
unsigned int flags;
- struct nla_policy *policy;
+ 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 struct sock *genl_sock;
+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)
- * @type: netlink message type
- * @hdrlen: length of the user specific header
+ * @family: generic netlink family
* @flags netlink message flags
* @cmd: generic netlink command
- * @version: version
*
* Returns pointer to user specific header
*/
static inline void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq,
- int type, int hdrlen, int flags,
- u8 cmd, u8 version)
+ struct genl_family *family, int flags, u8 cmd)
{
struct nlmsghdr *nlh;
struct genlmsghdr *hdr;
- nlh = nlmsg_put(skb, pid, seq, type, GENL_HDRLEN + hdrlen, flags);
+ 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 = version;
+ 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
* @skb: socket buffer the message is stored in
* @hdr: generic netlink message header
*/
-static inline int genlmsg_cancel(struct sk_buff *skb, void *hdr)
+static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr)
{
- return nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
+ nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
}
/**
- * genlmsg_multicast - multicast a netlink message
+ * 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
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);
+ 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 sk_buff *skb, u32 pid)
+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 nlmsg_unicast(genl_sock, skb, pid);
+ return genlmsg_unicast(genl_info_net(info), skb, info->snd_pid);
}
/**
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff