1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _AF_NETLINK_H
3 #define _AF_NETLINK_H
4
5 #include <linux/rhashtable.h>
6 #include <linux/atomic.h>
7 #include <linux/workqueue.h>
8 #include <net/sock.h>
9
10 /* flags */
11 enum {
12 NETLINK_F_KERNEL_SOCKET,
13 NETLINK_F_RECV_PKTINFO,
14 NETLINK_F_BROADCAST_SEND_ERROR,
15 NETLINK_F_RECV_NO_ENOBUFS,
16 NETLINK_F_LISTEN_ALL_NSID,
17 NETLINK_F_CAP_ACK,
18 NETLINK_F_EXT_ACK,
19 NETLINK_F_STRICT_CHK,
20 };
21
22 #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
23 #define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
24
25 struct netlink_sock {
26 /* struct sock has to be the first member of netlink_sock */
27 struct sock sk;
28 unsigned long flags;
29 u32 portid;
30 u32 dst_portid;
31 u32 dst_group;
32 u32 subscriptions;
33 u32 ngroups;
34 unsigned long *groups;
35 unsigned long state;
36 size_t max_recvmsg_len;
37 wait_queue_head_t wait;
38 bool bound;
39 bool cb_running;
40 int dump_done_errno;
41 struct netlink_callback cb;
42 struct mutex *cb_mutex;
43 struct mutex cb_def_mutex;
44 void (*netlink_rcv)(struct sk_buff *skb);
45 int (*netlink_bind)(struct net *net, int group);
46 void (*netlink_unbind)(struct net *net, int group);
47 void (*netlink_release)(struct sock *sk,
48 unsigned long *groups);
49 struct module *module;
50
51 struct rhash_head node;
52 struct rcu_head rcu;
53 struct work_struct work;
54 };
55
nlk_sk(struct sock * sk)56 static inline struct netlink_sock *nlk_sk(struct sock *sk)
57 {
58 return container_of(sk, struct netlink_sock, sk);
59 }
60
61 #define nlk_test_bit(nr, sk) test_bit(NETLINK_F_##nr, &nlk_sk(sk)->flags)
62
63 struct netlink_table {
64 struct rhashtable hash;
65 struct hlist_head mc_list;
66 struct listeners __rcu *listeners;
67 unsigned int flags;
68 unsigned int groups;
69 struct mutex *cb_mutex;
70 struct module *module;
71 int (*bind)(struct net *net, int group);
72 void (*unbind)(struct net *net, int group);
73 void (*release)(struct sock *sk,
74 unsigned long *groups);
75 int registered;
76 };
77
78 extern struct netlink_table *nl_table;
79 extern rwlock_t nl_table_lock;
80
81 #endif
82
