1#ifndef _NFNETLINK_H 2#define _NFNETLINK_H 3 4 5#include <linux/netlink.h> 6#include <linux/capability.h> 7#include <net/netlink.h> 8#include <uapi/linux/netfilter/nfnetlink.h> 9 10struct nfnl_callback { 11 int (*call)(struct sock *nl, struct sk_buff *skb, 12 const struct nlmsghdr *nlh, 13 const struct nlattr * const cda[]); 14 int (*call_rcu)(struct sock *nl, struct sk_buff *skb, 15 const struct nlmsghdr *nlh, 16 const struct nlattr * const cda[]); 17 int (*call_batch)(struct sock *nl, struct sk_buff *skb, 18 const struct nlmsghdr *nlh, 19 const struct nlattr * const cda[]); 20 const struct nla_policy *policy; /* netlink attribute policy */ 21 const u_int16_t attr_count; /* number of nlattr's */ 22}; 23 24struct nfnetlink_subsystem { 25 const char *name; 26 __u8 subsys_id; /* nfnetlink subsystem ID */ 27 __u8 cb_count; /* number of callbacks */ 28 const struct nfnl_callback *cb; /* callback for individual types */ 29 int (*commit)(struct sk_buff *skb); 30 int (*abort)(struct sk_buff *skb); 31}; 32 33int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n); 34int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n); 35 36int nfnetlink_has_listeners(struct net *net, unsigned int group); 37struct sk_buff *nfnetlink_alloc_skb(struct net *net, unsigned int size, 38 u32 dst_portid, gfp_t gfp_mask); 39int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid, 40 unsigned int group, int echo, gfp_t flags); 41int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error); 42int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid, 43 int flags); 44 45void nfnl_lock(__u8 subsys_id); 46void nfnl_unlock(__u8 subsys_id); 47#ifdef CONFIG_PROVE_LOCKING 48int lockdep_nfnl_is_held(__u8 subsys_id); 49#else 50static inline int lockdep_nfnl_is_held(__u8 subsys_id) 51{ 52 return 1; 53} 54#endif /* CONFIG_PROVE_LOCKING */ 55 56/* 57 * nfnl_dereference - fetch RCU pointer when updates are prevented by subsys mutex 58 * 59 * @p: The pointer to read, prior to dereferencing 60 * @ss: The nfnetlink subsystem ID 61 * 62 * Return the value of the specified RCU-protected pointer, but omit 63 * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because 64 * caller holds the NFNL subsystem mutex. 65 */ 66#define nfnl_dereference(p, ss) \ 67 rcu_dereference_protected(p, lockdep_nfnl_is_held(ss)) 68 69#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \ 70 MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys)) 71 72#endif /* _NFNETLINK_H */ 73