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 <linux/refcount.h> 10 #include <uapi/linux/rtnetlink.h> 11 12 extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo); 13 14 static inline int rtnetlink_maybe_send(struct sk_buff *skb, struct net *net, 15 u32 pid, u32 group, int echo) 16 { 17 return !skb ? 0 : rtnetlink_send(skb, net, pid, group, echo); 18 } 19 20 extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid); 21 extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, 22 u32 group, const struct nlmsghdr *nlh, gfp_t flags); 23 extern void rtnl_set_sk_err(struct net *net, u32 group, int error); 24 extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics); 25 extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, 26 u32 id, long expires, u32 error); 27 28 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, gfp_t flags, 29 u32 portid, const struct nlmsghdr *nlh); 30 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 31 gfp_t flags, int *new_nsid, int new_ifindex); 32 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 33 unsigned change, u32 event, 34 gfp_t flags, int *new_nsid, 35 int new_ifindex, u32 portid, 36 const struct nlmsghdr *nlh); 37 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, 38 gfp_t flags, u32 portid, const struct nlmsghdr *nlh); 39 40 41 /* RTNL is used as a global lock for all changes to network configuration */ 42 extern void rtnl_lock(void); 43 extern void rtnl_unlock(void); 44 extern int rtnl_trylock(void); 45 extern int rtnl_is_locked(void); 46 extern int rtnl_lock_killable(void); 47 extern bool refcount_dec_and_rtnl_lock(refcount_t *r); 48 49 extern wait_queue_head_t netdev_unregistering_wq; 50 extern atomic_t dev_unreg_count; 51 extern struct rw_semaphore pernet_ops_rwsem; 52 extern struct rw_semaphore net_rwsem; 53 54 #ifdef CONFIG_PROVE_LOCKING 55 extern bool lockdep_rtnl_is_held(void); 56 #else 57 static inline bool lockdep_rtnl_is_held(void) 58 { 59 return true; 60 } 61 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 62 63 /** 64 * rcu_dereference_rtnl - rcu_dereference with debug checking 65 * @p: The pointer to read, prior to dereferencing 66 * 67 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock() 68 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference() 69 */ 70 #define rcu_dereference_rtnl(p) \ 71 rcu_dereference_check(p, lockdep_rtnl_is_held()) 72 73 /** 74 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL 75 * @p: The pointer to read, prior to dereferencing 76 * 77 * Return the value of the specified RCU-protected pointer, but omit 78 * the READ_ONCE(), because caller holds RTNL. 79 */ 80 #define rtnl_dereference(p) \ 81 rcu_dereference_protected(p, lockdep_rtnl_is_held()) 82 83 /** 84 * rcu_replace_pointer_rtnl - replace an RCU pointer under rtnl_lock, returning 85 * its old value 86 * @rp: RCU pointer, whose value is returned 87 * @p: regular pointer 88 * 89 * Perform a replacement under rtnl_lock, where @rp is an RCU-annotated 90 * pointer. The old value of @rp is returned, and @rp is set to @p 91 */ 92 #define rcu_replace_pointer_rtnl(rp, p) \ 93 rcu_replace_pointer(rp, p, lockdep_rtnl_is_held()) 94 95 #ifdef CONFIG_DEBUG_NET_SMALL_RTNL 96 void __rtnl_net_lock(struct net *net); 97 void __rtnl_net_unlock(struct net *net); 98 void rtnl_net_lock(struct net *net); 99 void rtnl_net_unlock(struct net *net); 100 int rtnl_net_lock_cmp_fn(const struct lockdep_map *a, const struct lockdep_map *b); 101 #else 102 static inline void __rtnl_net_lock(struct net *net) {} 103 static inline void __rtnl_net_unlock(struct net *net) {} 104 105 static inline void rtnl_net_lock(struct net *net) 106 { 107 rtnl_lock(); 108 } 109 110 static inline void rtnl_net_unlock(struct net *net) 111 { 112 rtnl_unlock(); 113 } 114 #endif 115 116 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev) 117 { 118 return rtnl_dereference(dev->ingress_queue); 119 } 120 121 static inline struct netdev_queue *dev_ingress_queue_rcu(struct net_device *dev) 122 { 123 return rcu_dereference(dev->ingress_queue); 124 } 125 126 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev); 127 128 #ifdef CONFIG_NET_INGRESS 129 void net_inc_ingress_queue(void); 130 void net_dec_ingress_queue(void); 131 #endif 132 133 #ifdef CONFIG_NET_EGRESS 134 void net_inc_egress_queue(void); 135 void net_dec_egress_queue(void); 136 void netdev_xmit_skip_txqueue(bool skip); 137 #endif 138 139 void rtnetlink_init(void); 140 void __rtnl_unlock(void); 141 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail); 142 143 #define ASSERT_RTNL() \ 144 WARN_ONCE(!rtnl_is_locked(), \ 145 "RTNL: assertion failed at %s (%d)\n", __FILE__, __LINE__) 146 147 extern int ndo_dflt_fdb_dump(struct sk_buff *skb, 148 struct netlink_callback *cb, 149 struct net_device *dev, 150 struct net_device *filter_dev, 151 int *idx); 152 extern int ndo_dflt_fdb_add(struct ndmsg *ndm, 153 struct nlattr *tb[], 154 struct net_device *dev, 155 const unsigned char *addr, 156 u16 vid, 157 u16 flags); 158 extern int ndo_dflt_fdb_del(struct ndmsg *ndm, 159 struct nlattr *tb[], 160 struct net_device *dev, 161 const unsigned char *addr, 162 u16 vid); 163 164 extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 165 struct net_device *dev, u16 mode, 166 u32 flags, u32 mask, int nlflags, 167 u32 filter_mask, 168 int (*vlan_fill)(struct sk_buff *skb, 169 struct net_device *dev, 170 u32 filter_mask)); 171 172 extern void rtnl_offload_xstats_notify(struct net_device *dev); 173 174 static inline int rtnl_has_listeners(const struct net *net, u32 group) 175 { 176 struct sock *rtnl = net->rtnl; 177 178 return netlink_has_listeners(rtnl, group); 179 } 180 181 /** 182 * rtnl_notify_needed - check if notification is needed 183 * @net: Pointer to the net namespace 184 * @nlflags: netlink ingress message flags 185 * @group: rtnl group 186 * 187 * Based on the ingress message flags and rtnl group, returns true 188 * if a notification is needed, false otherwise. 189 */ 190 static inline bool 191 rtnl_notify_needed(const struct net *net, u16 nlflags, u32 group) 192 { 193 return (nlflags & NLM_F_ECHO) || rtnl_has_listeners(net, group); 194 } 195 196 void netdev_set_operstate(struct net_device *dev, int newstate); 197 198 #endif /* __LINUX_RTNETLINK_H */ 199