net/netlink/af_netlink.h

   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
  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         struct work_struct      work;
  49 };
  50
  51 static inline struct netlink_sock *nlk_sk(struct sock *sk)
  52 {
  53         return container_of(sk, struct netlink_sock, sk);
  54 }
  55
  56 struct netlink_table {
  57         struct rhashtable       hash;
  58         struct hlist_head       mc_list;
  59         struct listeners __rcu  *listeners;
  60         unsigned int            flags;
  61         unsigned int            groups;
  62         struct mutex            *cb_mutex;
  63         struct module           *module;
  64         int                     (*bind)(struct net *net, int group);
  65         void                    (*unbind)(struct net *net, int group);
  66         bool                    (*compare)(struct net *net, struct sock *sock);
  67         int                     registered;
  68 };
  69
  70 extern struct netlink_table *nl_table;
  71 extern rwlock_t nl_table_lock;
  72
  73 #endif