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 nl_cb_mutex;
43
44 struct mutex *dump_cb_mutex;
45 void (*netlink_rcv)(struct sk_buff *skb);
46 int (*netlink_bind)(struct net *net, int group);
47 void (*netlink_unbind)(struct net *net, int group);
48 void (*netlink_release)(struct sock *sk,
49 unsigned long *groups);
50 struct module *module;
51
52 struct rhash_head node;
53 struct rcu_head rcu;
54 struct work_struct work;
55 };
56
57 static inline struct netlink_sock *nlk_sk(struct sock *sk)
58 {
59 return container_of(sk, struct netlink_sock, sk);
60 }
61
62 #define nlk_test_bit(nr, sk) test_bit(NETLINK_F_##nr, &nlk_sk(sk)->flags)
63
64 struct netlink_table {
65 struct rhashtable hash;
66 struct hlist_head mc_list;
67 struct listeners __rcu *listeners;
68 unsigned int flags;
69 unsigned int groups;
70 struct mutex *cb_mutex;
71 struct module *module;
72 int (*bind)(struct net *net, int group);
73 void (*unbind)(struct net *net, int group);
74 void (*release)(struct sock *sk,
75 unsigned long *groups);
76 int registered;
77 };
78
79 extern struct netlink_table *nl_table;
80 extern rwlock_t nl_table_lock;
81
82 #endif
83
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.