LXR linux/include/linux/rtnetlink.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __LINUX_RTNETLINK_H
   3#define __LINUX_RTNETLINK_H
   4
   5
   6#include <linux/mutex.h>
   7#include <linux/netdevice.h>
   8#include <linux/wait.h>
   9#include <uapi/linux/rtnetlink.h>
  10
  11extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
  12extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid);
  13extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid,
  14                        u32 group, struct nlmsghdr *nlh, gfp_t flags);
  15extern void rtnl_set_sk_err(struct net *net, u32 group, int error);
  16extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
  17extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
  18                              u32 id, long expires, u32 error);
  19
  20void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change, gfp_t flags);
  21void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
  22                         gfp_t flags, int *new_nsid, int new_ifindex);
  23struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
  24                                       unsigned change, u32 event,
  25                                       gfp_t flags, int *new_nsid,
  26                                       int new_ifindex);
  27void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev,
  28                       gfp_t flags);
  29
  30
  31/* RTNL is used as a global lock for all changes to network configuration  */
  32extern void rtnl_lock(void);
  33extern void rtnl_unlock(void);
  34extern int rtnl_trylock(void);
  35extern int rtnl_is_locked(void);
  36extern int rtnl_lock_killable(void);
  37
  38extern wait_queue_head_t netdev_unregistering_wq;
  39extern struct rw_semaphore pernet_ops_rwsem;
  40extern struct rw_semaphore net_rwsem;
  41
  42#ifdef CONFIG_PROVE_LOCKING
  43extern bool lockdep_rtnl_is_held(void);
  44#else
  45static inline bool lockdep_rtnl_is_held(void)
  46{
  47        return true;
  48}
  49#endif /* #ifdef CONFIG_PROVE_LOCKING */
  50
  51/**
  52 * rcu_dereference_rtnl - rcu_dereference with debug checking
  53 * @p: The pointer to read, prior to dereferencing
  54 *
  55 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
  56 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
  57 */
  58#define rcu_dereference_rtnl(p)                                 \
  59        rcu_dereference_check(p, lockdep_rtnl_is_held())
  60
  61/**
  62 * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking
  63 * @p: The pointer to read, prior to dereference
  64 *
  65 * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh()
  66 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh()
  67 */
  68#define rcu_dereference_bh_rtnl(p)                              \
  69        rcu_dereference_bh_check(p, lockdep_rtnl_is_held())
  70
  71/**
  72 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
  73 * @p: The pointer to read, prior to dereferencing
  74 *
  75 * Return the value of the specified RCU-protected pointer, but omit
  76 * the READ_ONCE(), because caller holds RTNL.
  77 */
  78#define rtnl_dereference(p)                                     \
  79        rcu_dereference_protected(p, lockdep_rtnl_is_held())
  80
  81static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
  82{
  83        return rtnl_dereference(dev->ingress_queue);
  84}
  85
  86struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
  87
  88#ifdef CONFIG_NET_INGRESS
  89void net_inc_ingress_queue(void);
  90void net_dec_ingress_queue(void);
  91#endif
  92
  93#ifdef CONFIG_NET_EGRESS
  94void net_inc_egress_queue(void);
  95void net_dec_egress_queue(void);
  96#endif
  97
  98void rtnetlink_init(void);
  99void __rtnl_unlock(void);
 100void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail);
 101
 102#define ASSERT_RTNL() \
 103        WARN_ONCE(!rtnl_is_locked(), \
 104                  "RTNL: assertion failed at %s (%d)\n", __FILE__,  __LINE__)
 105
 106extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
 107                             struct netlink_callback *cb,
 108                             struct net_device *dev,
 109                             struct net_device *filter_dev,
 110                             int *idx);
 111extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
 112                            struct nlattr *tb[],
 113                            struct net_device *dev,
 114                            const unsigned char *addr,
 115                            u16 vid,
 116                            u16 flags);
 117extern int ndo_dflt_fdb_del(struct ndmsg *ndm,
 118                            struct nlattr *tb[],
 119                            struct net_device *dev,
 120                            const unsigned char *addr,
 121                            u16 vid);
 122
 123extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 124                                   struct net_device *dev, u16 mode,
 125                                   u32 flags, u32 mask, int nlflags,
 126                                   u32 filter_mask,
 127                                   int (*vlan_fill)(struct sk_buff *skb,
 128                                                    struct net_device *dev,
 129                                                    u32 filter_mask));
 130#endif  /* __LINUX_RTNETLINK_H */
 131