root/include/net/netfilter/nf_conntrack_core.h

INCLUDED FROM

DEFINITIONS

1. nf_conntrack_confirm

   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 */