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_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 sk_buff *skb, const struct nf_hook_state *state); 24 25 int nf_conntrack_init_net(struct net *net); 26 void nf_conntrack_cleanup_net(struct net *net); 27 void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list); 28 29 int nf_conntrack_proto_pernet_init(struct net *net); 30 void nf_conntrack_proto_pernet_fini(struct net *net); 31 32 int nf_conntrack_proto_init(void); 33 void nf_conntrack_proto_fini(void); 34 35 int nf_conntrack_init_start(void); 36 void nf_conntrack_cleanup_start(void); 37 38 void nf_conntrack_init_end(void); 39 void nf_conntrack_cleanup_end(void); 40 41 bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, 42 const struct nf_conntrack_tuple *orig); 43 44 /* Find a connection corresponding to a tuple. */ 45 struct nf_conntrack_tuple_hash * 46 nf_conntrack_find_get(struct net *net, 47 const struct nf_conntrack_zone *zone, 48 const struct nf_conntrack_tuple *tuple); 49 50 int __nf_conntrack_confirm(struct sk_buff *skb); 51 52 /* Confirm a connection: returns NF_DROP if packet must be dropped. */ 53 static inline int nf_conntrack_confirm(struct sk_buff *skb) 54 { 55 struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb); 56 int ret = NF_ACCEPT; 57 58 if (ct) { 59 if (!nf_ct_is_confirmed(ct)) 60 ret = __nf_conntrack_confirm(skb); 61 if (likely(ret == NF_ACCEPT)) 62 nf_ct_deliver_cached_events(ct); 63 } 64 return ret; 65 } 66 67 void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, 68 const struct nf_conntrack_l4proto *proto); 69 70 #define CONNTRACK_LOCKS 1024 71 72 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS]; 73 void nf_conntrack_lock(spinlock_t *lock); 74 75 extern spinlock_t nf_conntrack_expect_lock; 76 77 #endif /* _NF_CONNTRACK_CORE_H */ 78