1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _AF_NETLINK_H 2 #ifndef _AF_NETLINK_H
3 #define _AF_NETLINK_H 3 #define _AF_NETLINK_H
4 4
5 #include <linux/rhashtable.h> 5 #include <linux/rhashtable.h>
6 #include <linux/atomic.h> 6 #include <linux/atomic.h>
7 #include <linux/workqueue.h> 7 #include <linux/workqueue.h>
8 #include <net/sock.h> 8 #include <net/sock.h>
9 9
10 /* flags */ 10 /* flags */
11 enum { 11 enum {
12 NETLINK_F_KERNEL_SOCKET, 12 NETLINK_F_KERNEL_SOCKET,
13 NETLINK_F_RECV_PKTINFO, 13 NETLINK_F_RECV_PKTINFO,
14 NETLINK_F_BROADCAST_SEND_ERROR, 14 NETLINK_F_BROADCAST_SEND_ERROR,
15 NETLINK_F_RECV_NO_ENOBUFS, 15 NETLINK_F_RECV_NO_ENOBUFS,
16 NETLINK_F_LISTEN_ALL_NSID, 16 NETLINK_F_LISTEN_ALL_NSID,
17 NETLINK_F_CAP_ACK, 17 NETLINK_F_CAP_ACK,
18 NETLINK_F_EXT_ACK, 18 NETLINK_F_EXT_ACK,
19 NETLINK_F_STRICT_CHK, 19 NETLINK_F_STRICT_CHK,
20 }; 20 };
21 21
22 #define NLGRPSZ(x) (ALIGN(x, sizeof(unsig 22 #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
23 #define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(uns 23 #define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
24 24
25 struct netlink_sock { 25 struct netlink_sock {
26 /* struct sock has to be the first mem 26 /* struct sock has to be the first member of netlink_sock */
27 struct sock sk; 27 struct sock sk;
28 unsigned long flags; 28 unsigned long flags;
29 u32 portid; 29 u32 portid;
30 u32 dst_portid; 30 u32 dst_portid;
31 u32 dst_group; 31 u32 dst_group;
32 u32 subscriptions; 32 u32 subscriptions;
33 u32 ngroups; 33 u32 ngroups;
34 unsigned long *groups; 34 unsigned long *groups;
35 unsigned long state; 35 unsigned long state;
36 size_t max_recvmsg_le 36 size_t max_recvmsg_len;
37 wait_queue_head_t wait; 37 wait_queue_head_t wait;
38 bool bound; 38 bool bound;
39 bool cb_running; 39 bool cb_running;
40 int dump_done_errn 40 int dump_done_errno;
41 struct netlink_callback cb; 41 struct netlink_callback cb;
42 struct mutex nl_cb_mutex; 42 struct mutex nl_cb_mutex;
43 43
44 struct mutex *dump_cb_mutex 44 struct mutex *dump_cb_mutex;
45 void (*netlink_rcv) 45 void (*netlink_rcv)(struct sk_buff *skb);
46 int (*netlink_bind 46 int (*netlink_bind)(struct net *net, int group);
47 void (*netlink_unbi 47 void (*netlink_unbind)(struct net *net, int group);
48 void (*netlink_rele 48 void (*netlink_release)(struct sock *sk,
49 49 unsigned long *groups);
50 struct module *module; 50 struct module *module;
51 51
52 struct rhash_head node; 52 struct rhash_head node;
53 struct rcu_head rcu; 53 struct rcu_head rcu;
54 struct work_struct work; 54 struct work_struct work;
55 }; 55 };
56 56
57 static inline struct netlink_sock *nlk_sk(stru 57 static inline struct netlink_sock *nlk_sk(struct sock *sk)
58 { 58 {
59 return container_of(sk, struct netlink 59 return container_of(sk, struct netlink_sock, sk);
60 } 60 }
61 61
62 #define nlk_test_bit(nr, sk) test_bit(NETLINK_ 62 #define nlk_test_bit(nr, sk) test_bit(NETLINK_F_##nr, &nlk_sk(sk)->flags)
63 63
64 struct netlink_table { 64 struct netlink_table {
65 struct rhashtable hash; 65 struct rhashtable hash;
66 struct hlist_head mc_list; 66 struct hlist_head mc_list;
67 struct listeners __rcu *listeners; 67 struct listeners __rcu *listeners;
68 unsigned int flags; 68 unsigned int flags;
69 unsigned int groups; 69 unsigned int groups;
70 struct mutex *cb_mutex; 70 struct mutex *cb_mutex;
71 struct module *module; 71 struct module *module;
72 int (*bind)(struct 72 int (*bind)(struct net *net, int group);
73 void (*unbind)(stru 73 void (*unbind)(struct net *net, int group);
74 void (*release)(str 74 void (*release)(struct sock *sk,
75 uns 75 unsigned long *groups);
76 int registered; 76 int registered;
77 }; 77 };
78 78
79 extern struct netlink_table *nl_table; 79 extern struct netlink_table *nl_table;
80 extern rwlock_t nl_table_lock; 80 extern rwlock_t nl_table_lock;
81 81
82 #endif 82 #endif
83 83
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