net/netlink/af_netlink.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _AF_NETLINK_H
0003 #define _AF_NETLINK_H
0004
0005 #include <linux/rhashtable.h>
0006 #include <linux/atomic.h>
0007 #include <linux/workqueue.h>
0008 #include <net/sock.h>
0009
0010 /* flags */
0011 #define NETLINK_F_KERNEL_SOCKET     0x1
0012 #define NETLINK_F_RECV_PKTINFO      0x2
0013 #define NETLINK_F_BROADCAST_SEND_ERROR  0x4
0014 #define NETLINK_F_RECV_NO_ENOBUFS   0x8
0015 #define NETLINK_F_LISTEN_ALL_NSID   0x10
0016 #define NETLINK_F_CAP_ACK       0x20
0017 #define NETLINK_F_EXT_ACK       0x40
0018 #define NETLINK_F_STRICT_CHK        0x80
0019
0020 #define NLGRPSZ(x)  (ALIGN(x, sizeof(unsigned long) * 8) / 8)
0021 #define NLGRPLONGS(x)   (NLGRPSZ(x)/sizeof(unsigned long))
0022
0023 struct netlink_sock {
0024     /* struct sock has to be the first member of netlink_sock */
0025     struct sock     sk;
0026     u32         portid;
0027     u32         dst_portid;
0028     u32         dst_group;
0029     u32         flags;
0030     u32         subscriptions;
0031     u32         ngroups;
0032     unsigned long       *groups;
0033     unsigned long       state;
0034     size_t          max_recvmsg_len;
0035     wait_queue_head_t   wait;
0036     bool            bound;
0037     bool            cb_running;
0038     int         dump_done_errno;
0039     struct netlink_callback cb;
0040     struct mutex        *cb_mutex;
0041     struct mutex        cb_def_mutex;
0042     void            (*netlink_rcv)(struct sk_buff *skb);
0043     int         (*netlink_bind)(struct net *net, int group);
0044     void            (*netlink_unbind)(struct net *net, int group);
0045     struct module       *module;
0046
0047     struct rhash_head   node;
0048     struct rcu_head     rcu;
0049     struct work_struct  work;
0050 };
0051
0052 static inline struct netlink_sock *nlk_sk(struct sock *sk)
0053 {
0054     return container_of(sk, struct netlink_sock, sk);
0055 }
0056
0057 struct netlink_table {
0058     struct rhashtable   hash;
0059     struct hlist_head   mc_list;
0060     struct listeners __rcu  *listeners;
0061     unsigned int        flags;
0062     unsigned int        groups;
0063     struct mutex        *cb_mutex;
0064     struct module       *module;
0065     int         (*bind)(struct net *net, int group);
0066     void            (*unbind)(struct net *net, int group);
0067     bool            (*compare)(struct net *net, struct sock *sock);
0068     int         registered;
0069 };
0070
0071 extern struct netlink_table *nl_table;
0072 extern rwlock_t nl_table_lock;
0073
0074 #endif