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 #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