LXR linux/include/linux/genetlink.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __LINUX_GENERIC_NETLINK_H
   3#define __LINUX_GENERIC_NETLINK_H
   4
   5#include <uapi/linux/genetlink.h>
   6
   7
   8/* All generic netlink requests are serialized by a global lock.  */
   9extern void genl_lock(void);
  10extern void genl_unlock(void);
  11#ifdef CONFIG_LOCKDEP
  12extern bool lockdep_genl_is_held(void);
  13#endif
  14
  15/* for synchronisation between af_netlink and genetlink */
  16extern atomic_t genl_sk_destructing_cnt;
  17extern wait_queue_head_t genl_sk_destructing_waitq;
  18
  19/**
  20 * rcu_dereference_genl - rcu_dereference with debug checking
  21 * @p: The pointer to read, prior to dereferencing
  22 *
  23 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
  24 * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
  25 */
  26#define rcu_dereference_genl(p)                                 \
  27        rcu_dereference_check(p, lockdep_genl_is_held())
  28
  29/**
  30 * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
  31 * @p: The pointer to read, prior to dereferencing
  32 *
  33 * Return the value of the specified RCU-protected pointer, but omit
  34 * the READ_ONCE(), because caller holds genl mutex.
  35 */
  36#define genl_dereference(p)                                     \
  37        rcu_dereference_protected(p, lockdep_genl_is_held())
  38
  39#define MODULE_ALIAS_GENL_FAMILY(family)\
  40 MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family)
  41
  42#endif  /* __LINUX_GENERIC_NETLINK_H */
  43