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. */ 23 unsigned int nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, 24 struct sk_buff *skb); 25 26 int nf_conntrack_init_net(struct net *net); 27 void nf_conntrack_cleanup_net(struct net *net); 28 void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list); 29 30 int nf_conntrack_proto_pernet_init(struct net *net); 31 void nf_conntrack_proto_pernet_fini(struct net *net); 32 33 int nf_conntrack_proto_init(void); 34 void nf_conntrack_proto_fini(void); 35 36 int nf_conntrack_init_start(void); 37 void nf_conntrack_cleanup_start(void); 38 39 void nf_conntrack_init_end(void); 40 void nf_conntrack_cleanup_end(void); 41 42 bool nf_ct_get_tuple(const struct sk_buff *skb, unsigned int nhoff, 43 unsigned int dataoff, u_int16_t l3num, u_int8_t protonum, 44 struct nf_conntrack_tuple *tuple, 45 const struct nf_conntrack_l3proto *l3proto, 46 const struct nf_conntrack_l4proto *l4proto); 47 48 bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, 49 const struct nf_conntrack_tuple *orig, 50 const struct nf_conntrack_l3proto *l3proto, 51 const struct nf_conntrack_l4proto *l4proto); 52 53 /* Find a connection corresponding to a tuple. */ 54 struct nf_conntrack_tuple_hash * 55 nf_conntrack_find_get(struct net *net, u16 zone, 56 const struct nf_conntrack_tuple *tuple); 57 58 int __nf_conntrack_confirm(struct sk_buff *skb); 59 60 /* Confirm a connection: returns NF_DROP if packet must be dropped. */ 61 static inline int nf_conntrack_confirm(struct sk_buff *skb) 62 { 63 struct nf_conn *ct = (struct nf_conn *)skb->nfct; 64 int ret = NF_ACCEPT; 65 66 if (ct && !nf_ct_is_untracked(ct)) { 67 if (!nf_ct_is_confirmed(ct)) 68 ret = __nf_conntrack_confirm(skb); 69 if (likely(ret == NF_ACCEPT)) 70 nf_ct_deliver_cached_events(ct); 71 } 72 return ret; 73 } 74 75 void 76 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, 77 const struct nf_conntrack_l3proto *l3proto, 78 const struct nf_conntrack_l4proto *proto); 79 80 #ifdef CONFIG_LOCKDEP 81 # define CONNTRACK_LOCKS 8 82 #else 83 # define CONNTRACK_LOCKS 1024 84 #endif 85 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS]; 86 87 extern spinlock_t nf_conntrack_expect_lock; 88 89 #endif /* _NF_CONNTRACK_CORE_H */ 90