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 const struct nfgenmsg *nfmsg;
15 struct netlink_ext_ack *extack;
18 enum nfnl_callback_type {
25 struct nfnl_callback {
26 int (*call)(struct sk_buff *skb, const struct nfnl_info *info,
27 const struct nlattr * const cda[]);
28 const struct nla_policy *policy;
29 enum nfnl_callback_type type;
33 enum nfnl_abort_action {
39 struct nfnetlink_subsystem {
41 __u8 subsys_id; /* nfnetlink subsystem ID */
42 __u8 cb_count; /* number of callbacks */
43 const struct nfnl_callback *cb; /* callback for individual types */
45 int (*commit)(struct net *net, struct sk_buff *skb);
46 int (*abort)(struct net *net, struct sk_buff *skb,
47 enum nfnl_abort_action action);
48 void (*cleanup)(struct net *net);
49 bool (*valid_genid)(struct net *net, u32 genid);
52 int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
53 int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);
55 int nfnetlink_has_listeners(struct net *net, unsigned int group);
56 int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid,
57 unsigned int group, int echo, gfp_t flags);
58 int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error);
59 int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid);
60 void nfnetlink_broadcast(struct net *net, struct sk_buff *skb, __u32 portid,
61 __u32 group, gfp_t allocation);
63 static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type)
65 return subsys << 8 | msg_type;
68 static inline void nfnl_fill_hdr(struct nlmsghdr *nlh, u8 family, u8 version,
71 struct nfgenmsg *nfmsg;
73 nfmsg = nlmsg_data(nlh);
74 nfmsg->nfgen_family = family;
75 nfmsg->version = version;
76 nfmsg->res_id = res_id;
79 static inline struct nlmsghdr *nfnl_msg_put(struct sk_buff *skb, u32 portid,
80 u32 seq, int type, int flags,
81 u8 family, u8 version,
86 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
90 nfnl_fill_hdr(nlh, family, version, res_id);
95 void nfnl_lock(__u8 subsys_id);
96 void nfnl_unlock(__u8 subsys_id);
97 #ifdef CONFIG_PROVE_LOCKING
98 bool lockdep_nfnl_is_held(__u8 subsys_id);
100 static inline bool lockdep_nfnl_is_held(__u8 subsys_id)
104 #endif /* CONFIG_PROVE_LOCKING */
106 #define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
107 MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
109 #endif /* _NFNETLINK_H */