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 #define NETLINK_F_KERNEL_SOCKET 0x1 12 #define NETLINK_F_RECV_PKTINFO 0x2 13 #define NETLINK_F_BROADCAST_SEND_ERROR 0x4 14 #define NETLINK_F_RECV_NO_ENOBUFS 0x8 15 #define NETLINK_F_LISTEN_ALL_NSID 0x10 16 #define NETLINK_F_CAP_ACK 0x20 17 #define NETLINK_F_EXT_ACK 0x40 18 #define NETLINK_F_STRICT_CHK 0x80 19 20 #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8) 21 #define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long)) 22 23 struct netlink_sock { 24 /* struct sock has to be the first member of netlink_sock */ 25 struct sock sk; 26 u32 portid; 27 u32 dst_portid; 28 u32 dst_group; 29 u32 flags; 30 u32 subscriptions; 31 u32 ngroups; 32 unsigned long *groups; 33 unsigned long state; 34 size_t max_recvmsg_len; 35 wait_queue_head_t wait; 36 bool bound; 37 bool cb_running; 38 int dump_done_errno; 39 struct netlink_callback cb; 40 struct mutex *cb_mutex; 41 struct mutex cb_def_mutex; 42 void (*netlink_rcv)(struct sk_buff *skb); 43 int (*netlink_bind)(struct net *net, int group); 44 void (*netlink_unbind)(struct net *net, int group); 45 struct module *module; 46 47 struct rhash_head node; 48 struct rcu_head rcu; 49 struct work_struct work; 50 }; 51 52 static inline struct netlink_sock *nlk_sk(struct sock *sk) 53 { 54 return container_of(sk, struct netlink_sock, sk); 55 } 56 57 struct netlink_table { 58 struct rhashtable hash; 59 struct hlist_head mc_list; 60 struct listeners __rcu *listeners; 61 unsigned int flags; 62 unsigned int groups; 63 struct mutex *cb_mutex; 64 struct module *module; 65 int (*bind)(struct net *net, int group); 66 void (*unbind)(struct net *net, int group); 67 bool (*compare)(struct net *net, struct sock *sock); 68 int registered; 69 }; 70 71 extern struct netlink_table *nl_table; 72 extern rwlock_t nl_table_lock; 73 74 #endif 75