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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __LINUX_RTNETLINK_H |
3 | #define __LINUX_RTNETLINK_H | |
4 | ||
1da177e4 | 5 | |
6756ae4b | 6 | #include <linux/mutex.h> |
3b42a96d | 7 | #include <linux/netdevice.h> |
200b916f | 8 | #include <linux/wait.h> |
6f99528e | 9 | #include <linux/refcount.h> |
607ca46e | 10 | #include <uapi/linux/rtnetlink.h> |
1da177e4 | 11 | |
97c53cac | 12 | extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo); |
ddb6b284 PT |
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 | ||
97c53cac | 20 | extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid); |
1ce85fe4 | 21 | extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, |
1d997f10 | 22 | u32 group, const struct nlmsghdr *nlh, gfp_t flags); |
97c53cac | 23 | extern void rtnl_set_sk_err(struct net *net, u32 group, int error); |
1da177e4 | 24 | extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics); |
e3703b3d | 25 | extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, |
87a50699 | 26 | u32 id, long expires, u32 error); |
1da177e4 | 27 | |
1d997f10 HL |
28 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, gfp_t flags, |
29 | u32 portid, const struct nlmsghdr *nlh); | |
6621dd29 | 30 | void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, |
38e01b30 | 31 | gfp_t flags, int *new_nsid, int new_ifindex); |
395eea6c | 32 | struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, |
3d3ea5af | 33 | unsigned change, u32 event, |
38e01b30 | 34 | gfp_t flags, int *new_nsid, |
59d3efd2 MW |
35 | int new_ifindex, u32 portid, |
36 | const struct nlmsghdr *nlh); | |
395eea6c | 37 | void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, |
1d997f10 | 38 | gfp_t flags, u32 portid, const struct nlmsghdr *nlh); |
395eea6c | 39 | |
1da177e4 | 40 | |
6756ae4b | 41 | /* RTNL is used as a global lock for all changes to network configuration */ |
1da177e4 | 42 | extern void rtnl_lock(void); |
1da177e4 | 43 | extern void rtnl_unlock(void); |
6756ae4b | 44 | extern int rtnl_trylock(void); |
c9c1014b | 45 | extern int rtnl_is_locked(void); |
79ffdfc6 | 46 | extern int rtnl_lock_killable(void); |
6f99528e | 47 | extern bool refcount_dec_and_rtnl_lock(refcount_t *r); |
200b916f CW |
48 | |
49 | extern wait_queue_head_t netdev_unregistering_wq; | |
ffabe98c | 50 | extern atomic_t dev_unreg_count; |
4420bf21 | 51 | extern struct rw_semaphore pernet_ops_rwsem; |
f0b07bb1 | 52 | extern struct rw_semaphore net_rwsem; |
200b916f | 53 | |
a898def2 | 54 | #ifdef CONFIG_PROVE_LOCKING |
0cbf3343 | 55 | extern bool lockdep_rtnl_is_held(void); |
85328240 | 56 | #else |
0cbf3343 | 57 | static inline bool lockdep_rtnl_is_held(void) |
85328240 | 58 | { |
0cbf3343 | 59 | return true; |
85328240 | 60 | } |
a898def2 | 61 | #endif /* #ifdef CONFIG_PROVE_LOCKING */ |
6756ae4b | 62 | |
a6e0fc85 ED |
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() | |
29fa060e | 68 | * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference() |
a6e0fc85 ED |
69 | */ |
70 | #define rcu_dereference_rtnl(p) \ | |
d8bf4ca9 | 71 | rcu_dereference_check(p, lockdep_rtnl_is_held()) |
a6e0fc85 | 72 | |
7dff59ef | 73 | /** |
29fa060e | 74 | * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL |
7dff59ef ED |
75 | * @p: The pointer to read, prior to dereferencing |
76 | * | |
29fa060e | 77 | * Return the value of the specified RCU-protected pointer, but omit |
1ba9c5e6 | 78 | * the READ_ONCE(), because caller holds RTNL. |
7dff59ef ED |
79 | */ |
80 | #define rtnl_dereference(p) \ | |
29fa060e | 81 | rcu_dereference_protected(p, lockdep_rtnl_is_held()) |
7dff59ef | 82 | |
32da0f00 JHS |
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 | ||
24824a09 ED |
95 | static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev) |
96 | { | |
97 | return rtnl_dereference(dev->ingress_queue); | |
98 | } | |
99 | ||
3a7d0d07 VB |
100 | static inline struct netdev_queue *dev_ingress_queue_rcu(struct net_device *dev) |
101 | { | |
102 | return rcu_dereference(dev->ingress_queue); | |
103 | } | |
104 | ||
4577139b DB |
105 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev); |
106 | ||
1cf51900 | 107 | #ifdef CONFIG_NET_INGRESS |
4577139b DB |
108 | void net_inc_ingress_queue(void); |
109 | void net_dec_ingress_queue(void); | |
4577139b | 110 | #endif |
24824a09 | 111 | |
1f211a1b DB |
112 | #ifdef CONFIG_NET_EGRESS |
113 | void net_inc_egress_queue(void); | |
114 | void net_dec_egress_queue(void); | |
2f1e85b1 | 115 | void netdev_xmit_skip_txqueue(bool skip); |
1f211a1b DB |
116 | #endif |
117 | ||
1b5c5493 ED |
118 | void rtnetlink_init(void); |
119 | void __rtnl_unlock(void); | |
120 | void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail); | |
1da177e4 | 121 | |
66364bdf LR |
122 | #define ASSERT_RTNL() \ |
123 | WARN_ONCE(!rtnl_is_locked(), \ | |
124 | "RTNL: assertion failed at %s (%d)\n", __FILE__, __LINE__) | |
1da177e4 | 125 | |
77162022 JF |
126 | extern int ndo_dflt_fdb_dump(struct sk_buff *skb, |
127 | struct netlink_callback *cb, | |
128 | struct net_device *dev, | |
5d5eacb3 | 129 | struct net_device *filter_dev, |
d297653d | 130 | int *idx); |
090096bf VY |
131 | extern int ndo_dflt_fdb_add(struct ndmsg *ndm, |
132 | struct nlattr *tb[], | |
133 | struct net_device *dev, | |
134 | const unsigned char *addr, | |
f6f6424b JP |
135 | u16 vid, |
136 | u16 flags); | |
090096bf VY |
137 | extern int ndo_dflt_fdb_del(struct ndmsg *ndm, |
138 | struct nlattr *tb[], | |
139 | struct net_device *dev, | |
f6f6424b JP |
140 | const unsigned char *addr, |
141 | u16 vid); | |
815cccbf JF |
142 | |
143 | extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, | |
2c3c031c | 144 | struct net_device *dev, u16 mode, |
7d4f8d87 SF |
145 | u32 flags, u32 mask, int nlflags, |
146 | u32 filter_mask, | |
147 | int (*vlan_fill)(struct sk_buff *skb, | |
148 | struct net_device *dev, | |
149 | u32 filter_mask)); | |
5fd0b838 PM |
150 | |
151 | extern void rtnl_offload_xstats_notify(struct net_device *dev); | |
152 | ||
c5e2a973 JHS |
153 | static inline int rtnl_has_listeners(const struct net *net, u32 group) |
154 | { | |
155 | struct sock *rtnl = net->rtnl; | |
156 | ||
157 | return netlink_has_listeners(rtnl, group); | |
158 | } | |
159 | ||
8439109b VN |
160 | /** |
161 | * rtnl_notify_needed - check if notification is needed | |
162 | * @net: Pointer to the net namespace | |
163 | * @nlflags: netlink ingress message flags | |
164 | * @group: rtnl group | |
165 | * | |
166 | * Based on the ingress message flags and rtnl group, returns true | |
167 | * if a notification is needed, false otherwise. | |
168 | */ | |
169 | static inline bool | |
170 | rtnl_notify_needed(const struct net *net, u16 nlflags, u32 group) | |
171 | { | |
172 | return (nlflags & NLM_F_ECHO) || rtnl_has_listeners(net, group); | |
173 | } | |
174 | ||
6a2968ee ED |
175 | void netdev_set_operstate(struct net_device *dev, int newstate); |
176 | ||
1da177e4 | 177 | #endif /* __LINUX_RTNETLINK_H */ |