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_l3proto.h> 18 #include <net/netfilter/nf_conntrack_l4proto.h> 19 #include <net/netfilter/nf_conntrack_ecache.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 unsigned int nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, 25 struct sk_buff *skb); 26 27 int nf_conntrack_init_net(struct net *net); 28 void nf_conntrack_cleanup_net(struct net *net); 29 void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list); 30 31 int nf_conntrack_proto_pernet_init(struct net *net); 32 void nf_conntrack_proto_pernet_fini(struct net *net); 33 34 int nf_conntrack_proto_init(void); 35 void nf_conntrack_proto_fini(void); 36 37 int nf_conntrack_init_start(void); 38 void nf_conntrack_cleanup_start(void); 39 40 void nf_conntrack_init_end(void); 41 void nf_conntrack_cleanup_end(void); 42 43 bool nf_ct_get_tuple(const struct sk_buff *skb, unsigned int nhoff, 44 unsigned int dataoff, u_int16_t l3num, u_int8_t protonum, 45 struct net *net, 46 struct nf_conntrack_tuple *tuple, 47 const struct nf_conntrack_l3proto *l3proto, 48 const struct nf_conntrack_l4proto *l4proto); 49 50 bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, 51 const struct nf_conntrack_tuple *orig, 52 const struct nf_conntrack_l3proto *l3proto, 53 const struct nf_conntrack_l4proto *l4proto); 54 55 /* Find a connection corresponding to a tuple. */ 56 struct nf_conntrack_tuple_hash * 57 nf_conntrack_find_get(struct net *net, 58 const struct nf_conntrack_zone *zone, 59 const struct nf_conntrack_tuple *tuple); 60 61 int __nf_conntrack_confirm(struct sk_buff *skb); 62 63 /* Confirm a connection: returns NF_DROP if packet must be dropped. */ 64 static inline int nf_conntrack_confirm(struct sk_buff *skb) 65 { 66 struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb); 67 int ret = NF_ACCEPT; 68 69 if (ct) { 70 if (!nf_ct_is_confirmed(ct)) 71 ret = __nf_conntrack_confirm(skb); 72 if (likely(ret == NF_ACCEPT)) 73 nf_ct_deliver_cached_events(ct); 74 } 75 return ret; 76 } 77 78 void 79 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, 80 const struct nf_conntrack_l3proto *l3proto, 81 const struct nf_conntrack_l4proto *proto); 82 83 #define CONNTRACK_LOCKS 1024 84 85 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS]; 86 void nf_conntrack_lock(spinlock_t *lock); 87 88 extern spinlock_t nf_conntrack_expect_lock; 89 90 #endif /* _NF_CONNTRACK_CORE_H */ 91