1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/netlink.h>
6 #include <linux/capability.h>
7 #include <net/netlink.h>
8 #include <uapi/linux/netfilter/nfnetlink.h>
13 const struct nlmsghdr *nlh;
14 struct netlink_ext_ack *extack;
17 struct nfnl_callback {
18 int (*call)(struct sk_buff *skb, const struct nfnl_info *info,
19 const struct nlattr * const cda[]);
20 int (*call_rcu)(struct sk_buff *skb, const struct nfnl_info *info,
21 const struct nlattr * const cda[]);
22 int (*call_batch)(struct net *net, struct sock *nl, struct sk_buff *skb,
23 const struct nlmsghdr *nlh,
24 const struct nlattr * const cda[],
25 struct netlink_ext_ack *extack);
26 const struct nla_policy *policy; /* netlink attribute policy */
27 const u_int16_t attr_count; /* number of nlattr's */
30 enum nfnl_abort_action {
36 struct nfnetlink_subsystem {
38 __u8 subsys_id; /* nfnetlink subsystem ID */
39 __u8 cb_count; /* number of callbacks */
40 const struct nfnl_callback *cb; /* callback for individual types */
42 int (*commit)(struct net *net, struct sk_buff *skb);
43 int (*abort)(struct net *net, struct sk_buff *skb,
44 enum nfnl_abort_action action);
45 void (*cleanup)(struct net *net);
46 bool (*valid_genid)(struct net *net, u32 genid);
49 int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
50 int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);
52 int nfnetlink_has_listeners(struct net *net, unsigned int group);
53 int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid,
54 unsigned int group, int echo, gfp_t flags);
55 int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error);
56 int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid);
57 void nfnetlink_broadcast(struct net *net, struct sk_buff *skb, __u32 portid,
58 __u32 group, gfp_t allocation);
60 static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type)
62 return subsys << 8 | msg_type;
65 static inline void nfnl_fill_hdr(struct nlmsghdr *nlh, u8 family, u8 version,
68 struct nfgenmsg *nfmsg;
70 nfmsg = nlmsg_data(nlh);
71 nfmsg->nfgen_family = family;
72 nfmsg->version = version;
73 nfmsg->res_id = res_id;
76 static inline struct nlmsghdr *nfnl_msg_put(struct sk_buff *skb, u32 portid,
77 u32 seq, int type, int flags,
78 u8 family, u8 version,
83 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
87 nfnl_fill_hdr(nlh, family, version, res_id);
92 void nfnl_lock(__u8 subsys_id);
93 void nfnl_unlock(__u8 subsys_id);
94 #ifdef CONFIG_PROVE_LOCKING
95 bool lockdep_nfnl_is_held(__u8 subsys_id);
97 static inline bool lockdep_nfnl_is_held(__u8 subsys_id)
101 #endif /* CONFIG_PROVE_LOCKING */
103 #define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
104 MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
106 #endif /* _NFNETLINK_H */