include/net/netfilter/nf_conntrack_expect.h

   1 /*
   2  * connection tracking expectations.
   3  */
   4
   5 #ifndef _NF_CONNTRACK_EXPECT_H
   6 #define _NF_CONNTRACK_EXPECT_H
   7 #include <net/netfilter/nf_conntrack.h>
   8
   9 extern struct hlist_head *nf_ct_expect_hash;
  10 extern unsigned int nf_ct_expect_hsize;
  11 extern unsigned int nf_ct_expect_max;
  12
  13 struct nf_conntrack_expect
  14 {
  15         /* Conntrack expectation list member */
  16         struct hlist_node lnode;
  17
  18         /* Hash member */
  19         struct hlist_node hnode;
  20
  21         /* We expect this tuple, with the following mask */
  22         struct nf_conntrack_tuple tuple;
  23         struct nf_conntrack_tuple_mask mask;
  24
  25         /* Function to call after setup and insertion */
  26         void (*expectfn)(struct nf_conn *new,
  27                          struct nf_conntrack_expect *this);
  28
  29         /* Helper to assign to new connection */
  30         struct nf_conntrack_helper *helper;
  31
  32         /* The conntrack of the master connection */
  33         struct nf_conn *master;
  34
  35         /* Timer function; deletes the expectation. */
  36         struct timer_list timeout;
  37
  38         /* Usage count. */
  39         atomic_t use;
  40
  41         /* Flags */
  42         unsigned int flags;
  43
  44 #ifdef CONFIG_NF_NAT_NEEDED
  45         __be32 saved_ip;
  46         /* This is the original per-proto part, used to map the
  47          * expected connection the way the recipient expects. */
  48         union nf_conntrack_man_proto saved_proto;
  49         /* Direction relative to the master connection. */
  50         enum ip_conntrack_dir dir;
  51 #endif
  52
  53         struct rcu_head rcu;
  54 };
  55
  56 #define NF_CT_EXPECT_PERMANENT 0x1
  57
  58 int nf_conntrack_expect_init(void);
  59 void nf_conntrack_expect_fini(void);
  60
  61 struct nf_conntrack_expect *
  62 __nf_ct_expect_find(const struct nf_conntrack_tuple *tuple);
  63
  64 struct nf_conntrack_expect *
  65 nf_ct_expect_find_get(const struct nf_conntrack_tuple *tuple);
  66
  67 struct nf_conntrack_expect *
  68 nf_ct_find_expectation(const struct nf_conntrack_tuple *tuple);
  69
  70 void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);
  71 void nf_ct_remove_expectations(struct nf_conn *ct);
  72 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
  73
  74 /* Allocate space for an expectation: this is mandatory before calling
  75    nf_ct_expect_related.  You will have to call put afterwards. */
  76 struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
  77 void nf_ct_expect_init(struct nf_conntrack_expect *, int,
  78                        union nf_inet_addr *,
  79                        union nf_inet_addr *,
  80                        u_int8_t, __be16 *, __be16 *);
  81 void nf_ct_expect_put(struct nf_conntrack_expect *exp);
  82 int nf_ct_expect_related(struct nf_conntrack_expect *expect);
  83
  84 #endif /*_NF_CONNTRACK_EXPECT_H*/
  85