1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/rhashtable.h>
6 #include <linux/atomic.h>
7 #include <linux/workqueue.h>
11 #define NETLINK_F_KERNEL_SOCKET 0x1
12 #define NETLINK_F_RECV_PKTINFO 0x2
13 #define NETLINK_F_BROADCAST_SEND_ERROR 0x4
14 #define NETLINK_F_RECV_NO_ENOBUFS 0x8
15 #define NETLINK_F_LISTEN_ALL_NSID 0x10
16 #define NETLINK_F_CAP_ACK 0x20
17 #define NETLINK_F_EXT_ACK 0x40
19 #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
20 #define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
23 /* struct sock has to be the first member of netlink_sock */
31 unsigned long *groups;
33 size_t max_recvmsg_len;
34 wait_queue_head_t wait;
37 struct netlink_callback cb;
38 struct mutex *cb_mutex;
39 struct mutex cb_def_mutex;
40 void (*netlink_rcv)(struct sk_buff *skb);
41 int (*netlink_bind)(struct net *net, int group);
42 void (*netlink_unbind)(struct net *net, int group);
43 struct module *module;
45 struct rhash_head node;
47 struct work_struct work;
50 static inline struct netlink_sock *nlk_sk(struct sock *sk)
52 return container_of(sk, struct netlink_sock, sk);
55 struct netlink_table {
56 struct rhashtable hash;
57 struct hlist_head mc_list;
58 struct listeners __rcu *listeners;
61 struct mutex *cb_mutex;
62 struct module *module;
63 int (*bind)(struct net *net, int group);
64 void (*unbind)(struct net *net, int group);
65 bool (*compare)(struct net *net, struct sock *sock);
69 extern struct netlink_table *nl_table;
70 extern rwlock_t nl_table_lock;