1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _AF_NETLINK_H 3*4882a593Smuzhiyun #define _AF_NETLINK_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/rhashtable.h> 6*4882a593Smuzhiyun #include <linux/atomic.h> 7*4882a593Smuzhiyun #include <linux/workqueue.h> 8*4882a593Smuzhiyun #include <net/sock.h> 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun /* flags */ 11*4882a593Smuzhiyun #define NETLINK_F_KERNEL_SOCKET 0x1 12*4882a593Smuzhiyun #define NETLINK_F_RECV_PKTINFO 0x2 13*4882a593Smuzhiyun #define NETLINK_F_BROADCAST_SEND_ERROR 0x4 14*4882a593Smuzhiyun #define NETLINK_F_RECV_NO_ENOBUFS 0x8 15*4882a593Smuzhiyun #define NETLINK_F_LISTEN_ALL_NSID 0x10 16*4882a593Smuzhiyun #define NETLINK_F_CAP_ACK 0x20 17*4882a593Smuzhiyun #define NETLINK_F_EXT_ACK 0x40 18*4882a593Smuzhiyun #define NETLINK_F_STRICT_CHK 0x80 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8) 21*4882a593Smuzhiyun #define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long)) 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun struct netlink_sock { 24*4882a593Smuzhiyun /* struct sock has to be the first member of netlink_sock */ 25*4882a593Smuzhiyun struct sock sk; 26*4882a593Smuzhiyun u32 portid; 27*4882a593Smuzhiyun u32 dst_portid; 28*4882a593Smuzhiyun u32 dst_group; 29*4882a593Smuzhiyun u32 flags; 30*4882a593Smuzhiyun u32 subscriptions; 31*4882a593Smuzhiyun u32 ngroups; 32*4882a593Smuzhiyun unsigned long *groups; 33*4882a593Smuzhiyun unsigned long state; 34*4882a593Smuzhiyun size_t max_recvmsg_len; 35*4882a593Smuzhiyun wait_queue_head_t wait; 36*4882a593Smuzhiyun bool bound; 37*4882a593Smuzhiyun bool cb_running; 38*4882a593Smuzhiyun int dump_done_errno; 39*4882a593Smuzhiyun struct netlink_callback cb; 40*4882a593Smuzhiyun struct mutex *cb_mutex; 41*4882a593Smuzhiyun struct mutex cb_def_mutex; 42*4882a593Smuzhiyun void (*netlink_rcv)(struct sk_buff *skb); 43*4882a593Smuzhiyun int (*netlink_bind)(struct net *net, int group); 44*4882a593Smuzhiyun void (*netlink_unbind)(struct net *net, int group); 45*4882a593Smuzhiyun struct module *module; 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun struct rhash_head node; 48*4882a593Smuzhiyun struct rcu_head rcu; 49*4882a593Smuzhiyun struct work_struct work; 50*4882a593Smuzhiyun }; 51*4882a593Smuzhiyun nlk_sk(struct sock * sk)52*4882a593Smuzhiyunstatic inline struct netlink_sock *nlk_sk(struct sock *sk) 53*4882a593Smuzhiyun { 54*4882a593Smuzhiyun return container_of(sk, struct netlink_sock, sk); 55*4882a593Smuzhiyun } 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun struct netlink_table { 58*4882a593Smuzhiyun struct rhashtable hash; 59*4882a593Smuzhiyun struct hlist_head mc_list; 60*4882a593Smuzhiyun struct listeners __rcu *listeners; 61*4882a593Smuzhiyun unsigned int flags; 62*4882a593Smuzhiyun unsigned int groups; 63*4882a593Smuzhiyun struct mutex *cb_mutex; 64*4882a593Smuzhiyun struct module *module; 65*4882a593Smuzhiyun int (*bind)(struct net *net, int group); 66*4882a593Smuzhiyun void (*unbind)(struct net *net, int group); 67*4882a593Smuzhiyun bool (*compare)(struct net *net, struct sock *sock); 68*4882a593Smuzhiyun int registered; 69*4882a593Smuzhiyun }; 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun extern struct netlink_table *nl_table; 72*4882a593Smuzhiyun extern rwlock_t nl_table_lock; 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun #endif 75