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 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