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Linux/include/net/netfilter/nf_conntrack_core.h

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  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                         const struct nf_conntrack_l4proto *l4proto);
 44 
 45 /* Find a connection corresponding to a tuple. */
 46 struct nf_conntrack_tuple_hash *
 47 nf_conntrack_find_get(struct net *net,
 48                       const struct nf_conntrack_zone *zone,
 49                       const struct nf_conntrack_tuple *tuple);
 50 
 51 int __nf_conntrack_confirm(struct sk_buff *skb);
 52 
 53 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
 54 static inline int nf_conntrack_confirm(struct sk_buff *skb)
 55 {
 56         struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb);
 57         int ret = NF_ACCEPT;
 58 
 59         if (ct) {
 60                 if (!nf_ct_is_confirmed(ct))
 61                         ret = __nf_conntrack_confirm(skb);
 62                 if (likely(ret == NF_ACCEPT))
 63                         nf_ct_deliver_cached_events(ct);
 64         }
 65         return ret;
 66 }
 67 
 68 void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
 69                  const struct nf_conntrack_l4proto *proto);
 70 
 71 #define CONNTRACK_LOCKS 1024
 72 
 73 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
 74 void nf_conntrack_lock(spinlock_t *lock);
 75 
 76 extern spinlock_t nf_conntrack_expect_lock;
 77 
 78 #endif /* _NF_CONNTRACK_CORE_H */
 79 

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