LXR linux/net/netlink/af

   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
  23struct 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
  52static inline struct netlink_sock *nlk_sk(struct sock *sk)
  53{
  54        return container_of(sk, struct netlink_sock, sk);
  55}
  56
  57struct 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
  71extern struct netlink_table *nl_table;
  72extern rwlock_t nl_table_lock;
  73
  74#endif
  75