1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _NFNETLINK_H 3 #define _NFNETLINK_H 4 5 #include <linux/netlink.h> 6 #include <linux/capability.h> 7 #include <net/netlink.h> 8 #include <uapi/linux/netfilter/nfnetlink.h> 9 10 struct nfnl_callback { 11 int (*call)(struct net *net, struct sock *nl, struct sk_buff *skb, 12 const struct nlmsghdr *nlh, 13 const struct nlattr * const cda[], 14 struct netlink_ext_ack *extack); 15 int (*call_rcu)(struct net *net, struct sock *nl, struct sk_buff *skb, 16 const struct nlmsghdr *nlh, 17 const struct nlattr * const cda[], 18 struct netlink_ext_ack *extack); 19 int (*call_batch)(struct net *net, struct sock *nl, struct sk_buff *skb, 20 const struct nlmsghdr *nlh, 21 const struct nlattr * const cda[], 22 struct netlink_ext_ack *extack); 23 const struct nla_policy *policy; /* netlink attribute policy */ 24 const u_int16_t attr_count; /* number of nlattr's */ 25 }; 26 27 enum nfnl_abort_action { 28 NFNL_ABORT_NONE = 0, 29 NFNL_ABORT_AUTOLOAD, 30 NFNL_ABORT_VALIDATE, 31 }; 32 33 struct nfnetlink_subsystem { 34 const char *name; 35 __u8 subsys_id; /* nfnetlink subsystem ID */ 36 __u8 cb_count; /* number of callbacks */ 37 const struct nfnl_callback *cb; /* callback for individual types */ 38 struct module *owner; 39 int (*commit)(struct net *net, struct sk_buff *skb); 40 int (*abort)(struct net *net, struct sk_buff *skb, 41 enum nfnl_abort_action action); 42 void (*cleanup)(struct net *net); 43 bool (*valid_genid)(struct net *net, u32 genid); 44 }; 45 46 int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n); 47 int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n); 48 49 int nfnetlink_has_listeners(struct net *net, unsigned int group); 50 int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid, 51 unsigned int group, int echo, gfp_t flags); 52 int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error); 53 int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid); 54 55 static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type) 56 { 57 return subsys << 8 | msg_type; 58 } 59 60 void nfnl_lock(__u8 subsys_id); 61 void nfnl_unlock(__u8 subsys_id); 62 #ifdef CONFIG_PROVE_LOCKING 63 bool lockdep_nfnl_is_held(__u8 subsys_id); 64 #else 65 static inline bool lockdep_nfnl_is_held(__u8 subsys_id) 66 { 67 return true; 68 } 69 #endif /* CONFIG_PROVE_LOCKING */ 70 71 #define MODULE_ALIAS_NFNL_SUBSYS(subsys) \ 72 MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys)) 73 74 #endif /* _NFNETLINK_H */ 75