1/* 2 * This header is used to share core functionality between the 3 * standalone connection tracking module, and the compatibility layer's use 4 * of connection tracking. 5 * 6 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> 7 * - generalize L3 protocol dependent part. 8 * 9 * Derived from include/linux/netfiter_ipv4/ip_conntrack_core.h 10 */ 11 12#ifndef _NF_CONNTRACK_CORE_H 13#define _NF_CONNTRACK_CORE_H 14 15#include <linux/netfilter.h> 16#include <net/netfilter/nf_conntrack_l3proto.h> 17#include <net/netfilter/nf_conntrack_l4proto.h> 18#include <net/netfilter/nf_conntrack_ecache.h> 19 20/* This header is used to share core functionality between the 21 standalone connection tracking module, and the compatibility layer's use 22 of connection tracking. */ 23extern unsigned int nf_conntrack_in(struct net *net, 24 u_int8_t pf, 25 unsigned int hooknum, 26 struct sk_buff *skb); 27 28extern int nf_conntrack_init(struct net *net); 29extern void nf_conntrack_cleanup(struct net *net); 30 31extern int nf_conntrack_proto_init(void); 32extern void nf_conntrack_proto_fini(void); 33 34extern bool 35nf_ct_get_tuple(const struct sk_buff *skb, 36 unsigned int nhoff, 37 unsigned int dataoff, 38 u_int16_t l3num, 39 u_int8_t protonum, 40 struct nf_conntrack_tuple *tuple, 41 const struct nf_conntrack_l3proto *l3proto, 42 const struct nf_conntrack_l4proto *l4proto); 43 44extern bool 45nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, 46 const struct nf_conntrack_tuple *orig, 47 const struct nf_conntrack_l3proto *l3proto, 48 const struct nf_conntrack_l4proto *l4proto); 49 50/* Find a connection corresponding to a tuple. */ 51extern struct nf_conntrack_tuple_hash * 52nf_conntrack_find_get(struct net *net, u16 zone, 53 const struct nf_conntrack_tuple *tuple); 54 55extern int __nf_conntrack_confirm(struct sk_buff *skb); 56 57/* Confirm a connection: returns NF_DROP if packet must be dropped. */ 58static inline int nf_conntrack_confirm(struct sk_buff *skb) 59{ 60 struct nf_conn *ct = (struct nf_conn *)skb->nfct; 61 int ret = NF_ACCEPT; 62 63 if (ct && !nf_ct_is_untracked(ct)) { 64 if (!nf_ct_is_confirmed(ct)) 65 ret = __nf_conntrack_confirm(skb); 66 if (likely(ret == NF_ACCEPT)) 67 nf_ct_deliver_cached_events(ct); 68 } 69 return ret; 70} 71 72int 73print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, 74 const struct nf_conntrack_l3proto *l3proto, 75 const struct nf_conntrack_l4proto *proto); 76 77extern spinlock_t nf_conntrack_lock ; 78 79#endif /* _NF_CONNTRACK_CORE_H */ 80