| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | #define NETLINK_F_KERNEL_SOCKET 0x1 |
| 11 | #define NETLINK_F_RECV_PKTINFO 0x2 |
| 12 | #define NETLINK_F_BROADCAST_SEND_ERROR 0x4 |
| 13 | #define NETLINK_F_RECV_NO_ENOBUFS 0x8 |
| 14 | #define NETLINK_F_LISTEN_ALL_NSID 0x10 |
| 15 | #define NETLINK_F_CAP_ACK 0x20 |
| 16 | #define NETLINK_F_EXT_ACK 0x40 |
| 17 | #define NETLINK_F_STRICT_CHK 0x80 |
| 18 | |
| 19 | #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8) |
| 20 | #define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long)) |
| 21 | |
| 22 | struct netlink_sock { |
| 23 | /* struct sock has to be the first member of netlink_sock */ |
| 24 | struct sock sk; |
| 25 | u32 portid; |
| 26 | u32 dst_portid; |
| 27 | u32 dst_group; |
| 28 | u32 flags; |
| 29 | u32 subscriptions; |
| 30 | u32 ngroups; |
| 31 | unsigned long *groups; |
| 32 | unsigned long state; |
| 33 | size_t max_recvmsg_len; |
| 34 | wait_queue_head_t wait; |
| 35 | bool bound; |
| 36 | bool cb_running; |
| 37 | int dump_done_errno; |
| 38 | struct netlink_callback cb; |
| 39 | struct mutex *cb_mutex; |
| 40 | struct mutex cb_def_mutex; |
| 41 | void (*netlink_rcv)(struct sk_buff *skb); |
| 42 | int (*netlink_bind)(struct net *net, int group); |
| 43 | void (*netlink_unbind)(struct net *net, int group); |
| 44 | struct module *module; |
| 45 | |
| 46 | struct rhash_head node; |
| 47 | struct rcu_head rcu; |
| 48 | }; |
| 49 | |
| 50 | static inline struct netlink_sock *nlk_sk(struct sock *sk) |
| 51 | { |
| 52 | return container_of(sk, struct netlink_sock, sk); |
| 53 | } |
| 54 | |
| 55 | struct netlink_table { |
| 56 | struct rhashtable hash; |
| 57 | struct hlist_head mc_list; |
| 58 | struct listeners __rcu *listeners; |
| 59 | unsigned int flags; |
| 60 | unsigned int groups; |
| 61 | struct mutex *cb_mutex; |
| 62 | struct module *module; |
| 63 | int (*bind)(struct net *net, int group); |
| 64 | void (*unbind)(struct net *net, int group); |
| 65 | bool (*compare)(struct net *net, struct sock *sock); |
| 66 | int registered; |
| 67 | }; |
| 68 | |
| 69 | extern struct netlink_table *nl_table; |
| 70 | extern rwlock_t nl_table_lock; |
| 71 | |
| 72 | #endif |