1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * This header is used to share core functionality between the 4 * standalone connection tracking module, and the compatibility layer's use 5 * of connection tracking. 6 * 7 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> 8 * - generalize L3 protocol dependent part. 9 * 10 * Derived from include/linux/netfiter_ipv4/ip_conntrack_core.h 11 */ 12 13 #ifndef _NF_CONNTRACK_CORE_H 14 #define _NF_CONNTRACK_CORE_H 15 16 #include <linux/netfilter.h> 17 #include <net/netfilter/nf_conntrack.h> 18 #include <net/netfilter/nf_conntrack_ecache.h> 19 #include <net/netfilter/nf_conntrack_l4proto.h> 20 21 /* This header is used to share core functionality between the 22 standalone connection tracking module, and the compatibility layer's use 23 of connection tracking. */ 24 25 unsigned int nf_conntrack_in(struct sk_buff *skb, 26 const struct nf_hook_state *state); 27 28 int nf_conntrack_init_net(struct net *net); 29 void nf_conntrack_cleanup_net(struct net *net); 30 void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list); 31 32 void nf_conntrack_proto_pernet_init(struct net *net); 33 void nf_conntrack_proto_pernet_fini(struct net *net); 34 35 int nf_conntrack_proto_init(void); 36 void nf_conntrack_proto_fini(void); 37 38 int nf_conntrack_init_start(void); 39 void nf_conntrack_cleanup_start(void); 40 41 void nf_conntrack_init_end(void); 42 void nf_conntrack_cleanup_end(void); 43 44 bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, 45 const struct nf_conntrack_tuple *orig); 46 47 /* Find a connection corresponding to a tuple. */ 48 struct nf_conntrack_tuple_hash * 49 nf_conntrack_find_get(struct net *net, 50 const struct nf_conntrack_zone *zone, 51 const struct nf_conntrack_tuple *tuple); 52 53 int __nf_conntrack_confirm(struct sk_buff *skb); 54 55 /* Confirm a connection: returns NF_DROP if packet must be dropped. */ 56 static inline int nf_conntrack_confirm(struct sk_buff *skb) 57 { 58 struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb); 59 int ret = NF_ACCEPT; 60 61 if (ct) { 62 if (!nf_ct_is_confirmed(ct)) 63 ret = __nf_conntrack_confirm(skb); 64 if (likely(ret == NF_ACCEPT)) 65 nf_ct_deliver_cached_events(ct); 66 } 67 return ret; 68 } 69 70 unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff, 71 struct nf_conn *ct, enum ip_conntrack_info ctinfo); 72 73 void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, 74 const struct nf_conntrack_l4proto *proto); 75 76 #define CONNTRACK_LOCKS 1024 77 78 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS]; 79 void nf_conntrack_lock(spinlock_t *lock); 80 81 extern spinlock_t nf_conntrack_expect_lock; 82 83 #endif /* _NF_CONNTRACK_CORE_H */ 84