projects/linux·blob assoc-array-fixes · refs

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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
12extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
13
14static 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
20extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid);
21extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid,
22 u32 group, const struct nlmsghdr *nlh, gfp_t flags);
23extern void rtnl_set_sk_err(struct net *net, u32 group, int error);
24extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
25extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
26 u32 id, long expires, u32 error);
27
28void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, gfp_t flags,
29 u32 portid, const struct nlmsghdr *nlh);
30void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
31 gfp_t flags, int *new_nsid, int new_ifindex);
32struct 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);
37void 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 */
42extern void rtnl_lock(void);
43extern void rtnl_unlock(void);
44extern int rtnl_trylock(void);
45extern int rtnl_is_locked(void);
46extern int rtnl_lock_interruptible(void);
47extern int rtnl_lock_killable(void);
48extern bool refcount_dec_and_rtnl_lock(refcount_t *r);
49
50extern wait_queue_head_t netdev_unregistering_wq;
51extern atomic_t dev_unreg_count;
52extern struct rw_semaphore pernet_ops_rwsem;
53extern struct rw_semaphore net_rwsem;
54
55#define ASSERT_RTNL() \
56 WARN_ONCE(!rtnl_is_locked(), \
57 "RTNL: assertion failed at %s (%d)\n", __FILE__, __LINE__)
58
59#ifdef CONFIG_PROVE_LOCKING
60extern bool lockdep_rtnl_is_held(void);
61#else
62static inline bool lockdep_rtnl_is_held(void)
63{
64 return true;
65}
66#endif /* #ifdef CONFIG_PROVE_LOCKING */
67
68/**
69 * rcu_dereference_rtnl - rcu_dereference with debug checking
70 * @p: The pointer to read, prior to dereferencing
71 *
72 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
73 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
74 */
75#define rcu_dereference_rtnl(p) \
76 rcu_dereference_check(p, lockdep_rtnl_is_held())
77
78/**
79 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
80 * @p: The pointer to read, prior to dereferencing
81 *
82 * Return: the value of the specified RCU-protected pointer, but omit
83 * the READ_ONCE(), because caller holds RTNL.
84 */
85#define rtnl_dereference(p) \
86 rcu_dereference_protected(p, lockdep_rtnl_is_held())
87
88/**
89 * rcu_replace_pointer_rtnl - replace an RCU pointer under rtnl_lock, returning
90 * its old value
91 * @rp: RCU pointer, whose value is returned
92 * @p: regular pointer
93 *
94 * Perform a replacement under rtnl_lock, where @rp is an RCU-annotated
95 * pointer. The old value of @rp is returned, and @rp is set to @p
96 */
97#define rcu_replace_pointer_rtnl(rp, p) \
98 rcu_replace_pointer(rp, p, lockdep_rtnl_is_held())
99
100#ifdef CONFIG_DEBUG_NET_SMALL_RTNL
101void __rtnl_net_lock(struct net *net);
102void __rtnl_net_unlock(struct net *net);
103void rtnl_net_lock(struct net *net);
104void rtnl_net_unlock(struct net *net);
105int rtnl_net_trylock(struct net *net);
106int rtnl_net_lock_killable(struct net *net);
107int rtnl_net_lock_cmp_fn(const struct lockdep_map *a, const struct lockdep_map *b);
108
109bool rtnl_net_is_locked(struct net *net);
110
111#define ASSERT_RTNL_NET(net) \
112 WARN_ONCE(!rtnl_net_is_locked(net), \
113 "RTNL_NET: assertion failed at %s (%d)\n", \
114 __FILE__, __LINE__)
115
116bool lockdep_rtnl_net_is_held(struct net *net);
117
118void rtnl_net_queue_work(struct net *net);
119void rtnl_net_flush_workqueue(void);
120void rtnl_net_work_func(struct work_struct *work);
121
122#define rcu_dereference_rtnl_net(net, p) \
123 rcu_dereference_check(p, lockdep_rtnl_net_is_held(net))
124#define rtnl_net_dereference(net, p) \
125 rcu_dereference_protected(p, lockdep_rtnl_net_is_held(net))
126#define rcu_replace_pointer_rtnl_net(net, rp, p) \
127 rcu_replace_pointer(rp, p, lockdep_rtnl_net_is_held(net))
128#else
129static inline void __rtnl_net_lock(struct net *net) {}
130static inline void __rtnl_net_unlock(struct net *net) {}
131
132static inline void rtnl_net_lock(struct net *net)
133{
134 rtnl_lock();
135}
136
137static inline void rtnl_net_unlock(struct net *net)
138{
139 rtnl_unlock();
140}
141
142static inline int rtnl_net_trylock(struct net *net)
143{
144 return rtnl_trylock();
145}
146
147static inline int rtnl_net_lock_killable(struct net *net)
148{
149 return rtnl_lock_killable();
150}
151
152static inline void ASSERT_RTNL_NET(struct net *net)
153{
154 ASSERT_RTNL();
155}
156
157static inline void rtnl_net_flush_workqueue(void)
158{
159}
160
161#define rcu_dereference_rtnl_net(net, p) \
162 rcu_dereference_rtnl(p)
163#define rtnl_net_dereference(net, p) \
164 rtnl_dereference(p)
165#define rcu_replace_pointer_rtnl_net(net, rp, p) \
166 rcu_replace_pointer_rtnl(rp, p)
167#endif
168
169static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
170{
171 return rtnl_dereference(dev->ingress_queue);
172}
173
174static inline struct netdev_queue *dev_ingress_queue_rcu(struct net_device *dev)
175{
176 return rcu_dereference(dev->ingress_queue);
177}
178
179struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
180
181#ifdef CONFIG_NET_INGRESS
182void net_inc_ingress_queue(void);
183void net_dec_ingress_queue(void);
184#endif
185
186#ifdef CONFIG_NET_EGRESS
187void net_inc_egress_queue(void);
188void net_dec_egress_queue(void);
189bool netdev_xmit_skip_txqueue(bool skip);
190#else
191static inline bool netdev_xmit_skip_txqueue(bool skip)
192{
193 return false;
194}
195#endif
196
197void rtnetlink_init(void);
198void __rtnl_unlock(void);
199void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail);
200
201/* Shared by rtnl_fdb_dump() and various ndo_fdb_dump() helpers. */
202struct ndo_fdb_dump_context {
203 unsigned long ifindex;
204 unsigned long fdb_idx;
205};
206
207extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
208 struct netlink_callback *cb,
209 struct net_device *dev,
210 struct net_device *filter_dev,
211 int *idx);
212extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
213 struct nlattr *tb[],
214 struct net_device *dev,
215 const unsigned char *addr,
216 u16 vid,
217 u16 flags);
218extern int ndo_dflt_fdb_del(struct ndmsg *ndm,
219 struct nlattr *tb[],
220 struct net_device *dev,
221 const unsigned char *addr,
222 u16 vid);
223
224extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
225 struct net_device *dev, u16 mode,
226 u32 flags, u32 mask, int nlflags,
227 u32 filter_mask,
228 int (*vlan_fill)(struct sk_buff *skb,
229 struct net_device *dev,
230 u32 filter_mask));
231
232extern void rtnl_offload_xstats_notify(struct net_device *dev);
233
234static inline int rtnl_has_listeners(const struct net *net, u32 group)
235{
236 struct sock *rtnl = net->rtnl;
237
238 return netlink_has_listeners(rtnl, group);
239}
240
241/**
242 * rtnl_notify_needed - check if notification is needed
243 * @net: Pointer to the net namespace
244 * @nlflags: netlink ingress message flags
245 * @group: rtnl group
246 *
247 * Based on the ingress message flags and rtnl group, returns true
248 * if a notification is needed, false otherwise.
249 */
250static inline bool
251rtnl_notify_needed(const struct net *net, u16 nlflags, u32 group)
252{
253 return (nlflags & NLM_F_ECHO) || rtnl_has_listeners(net, group);
254}
255
256void netif_set_operstate(struct net_device *dev, int newstate);
257
258#endif /* __LINUX_RTNETLINK_H */