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