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 | |
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 | |