projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| f9e815b3 HW |
2 | #ifndef _NFNETLINK_H |
| 3 | #define _NFNETLINK_H | |
| ac6d439d | 4 | |
| 080774a2 | 5 | #include <linux/netlink.h> |
| f9e815b3 | 6 | #include <linux/capability.h> |
| df6fb868 | 7 | #include <net/netlink.h> |
| 94d0ec58 | 8 | #include <uapi/linux/netfilter/nfnetlink.h> |
| f9e815b3 | 9 | |
| d94d9fee | 10 | struct nfnl_callback { |
| 7b8002a1 | 11 | int (*call)(struct net *net, struct sock *nl, struct sk_buff *skb, |
| 6b75e3e8 | 12 | const struct nlmsghdr *nlh, |
| 04ba724b PNA |
13 | const struct nlattr * const cda[], |
| 14 | struct netlink_ext_ack *extack); | |
| 7b8002a1 PNA |
15 | int (*call_rcu)(struct net *net, struct sock *nl, struct sk_buff *skb, |
| 16 | const struct nlmsghdr *nlh, | |
| 04ba724b PNA |
17 | const struct nlattr * const cda[], |
| 18 | struct netlink_ext_ack *extack); | |
| 633c9a84 | 19 | int (*call_batch)(struct net *net, struct sock *nl, struct sk_buff *skb, |
| 0628b123 | 20 | const struct nlmsghdr *nlh, |
| 04ba724b PNA |
21 | const struct nlattr * const cda[], |
| 22 | struct netlink_ext_ack *extack); | |
| e3730578 PM |
23 | const struct nla_policy *policy; /* netlink attribute policy */ |
| 24 | const u_int16_t attr_count; /* number of nlattr's */ | |
| f9e815b3 HW |
25 | }; |
| 26 | ||
| d94d9fee | 27 | struct nfnetlink_subsystem { |
| f9e815b3 | 28 | const char *name; |
| 7c8d4cb4 PM |
29 | __u8 subsys_id; /* nfnetlink subsystem ID */ |
| 30 | __u8 cb_count; /* number of callbacks */ | |
| 31 | const struct nfnl_callback *cb; /* callback for individual types */ | |
| 5913beaf PNA |
32 | int (*commit)(struct net *net, struct sk_buff *skb); |
| 33 | int (*abort)(struct net *net, struct sk_buff *skb); | |
| 8c4d4e8b | 34 | bool (*valid_genid)(struct net *net, u32 genid); |
| f9e815b3 HW |
35 | }; |
| 36 | ||
| a0f4ecf3 JP |
37 | int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n); |
| 38 | int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n); | |
| 39 | ||
| 40 | int nfnetlink_has_listeners(struct net *net, unsigned int group); | |
| a0f4ecf3 JP |
41 | int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid, |
| 42 | unsigned int group, int echo, gfp_t flags); | |
| 43 | int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error); | |
| 44 | int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid, | |
| 45 | int flags); | |
| 46 | ||
| dedb67c4 PNA |
47 | static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type) |
| 48 | { | |
| 49 | return subsys << 8 | msg_type; | |
| 50 | } | |
| 51 | ||
| a0f4ecf3 JP |
52 | void nfnl_lock(__u8 subsys_id); |
| 53 | void nfnl_unlock(__u8 subsys_id); | |
| 0eb5db7a | 54 | #ifdef CONFIG_PROVE_LOCKING |
| 875e0829 | 55 | bool lockdep_nfnl_is_held(__u8 subsys_id); |
| 0eb5db7a | 56 | #else |
| 875e0829 | 57 | static inline bool lockdep_nfnl_is_held(__u8 subsys_id) |
| 0eb5db7a | 58 | { |
| 875e0829 | 59 | return true; |
| 0eb5db7a PM |
60 | } |
| 61 | #endif /* CONFIG_PROVE_LOCKING */ | |
| 62 | ||
| 63 | /* | |
| 64 | * nfnl_dereference - fetch RCU pointer when updates are prevented by subsys mutex | |
| 65 | * | |
| 66 | * @p: The pointer to read, prior to dereferencing | |
| 67 | * @ss: The nfnetlink subsystem ID | |
| 68 | * | |
| 69 | * Return the value of the specified RCU-protected pointer, but omit | |
| 70 | * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because | |
| 71 | * caller holds the NFNL subsystem mutex. | |
| 72 | */ | |
| 73 | #define nfnl_dereference(p, ss) \ | |
| 74 | rcu_dereference_protected(p, lockdep_nfnl_is_held(ss)) | |
| e6a7d3c0 | 75 | |
| 0ab43f84 HW |
76 | #define MODULE_ALIAS_NFNL_SUBSYS(subsys) \ |
| 77 | MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys)) | |
| 78 | ||
| f9e815b3 | 79 | #endif /* _NFNETLINK_H */ |