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 list_head nf_conntrack_expect_list;
  10 extern kmem_cache_t *nf_conntrack_expect_cachep;
  11 extern struct file_operations exp_file_ops;
  12
  13 struct nf_conntrack_expect
  14 {
  15         /* Internal linked list (global expectation list) */
  16         struct list_head list;
  17
  18         /* We expect this tuple, with the following mask */
  19         struct nf_conntrack_tuple tuple, mask;
  20
  21         /* Function to call after setup and insertion */
  22         void (*expectfn)(struct nf_conn *new,
  23                          struct nf_conntrack_expect *this);
  24
  25         /* Helper to assign to new connection */
  26         struct nf_conntrack_helper *helper;
  27
  28         /* The conntrack of the master connection */
  29         struct nf_conn *master;
  30
  31         /* Timer function; deletes the expectation. */
  32         struct timer_list timeout;
  33
  34         /* Usage count. */
  35         atomic_t use;
  36
  37         /* Unique ID */
  38         unsigned int id;
  39
  40         /* Flags */
  41         unsigned int flags;
  42
  43 #ifdef CONFIG_NF_NAT_NEEDED
  44         /* This is the original per-proto part, used to map the
  45          * expected connection the way the recipient expects. */
  46         union nf_conntrack_man_proto saved_proto;
  47         /* Direction relative to the master connection. */
  48         enum ip_conntrack_dir dir;
  49 #endif
  50 };
  51
  52 #define NF_CT_EXPECT_PERMANENT 0x1
  53
  54
  55 struct nf_conntrack_expect *
  56 __nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple);
  57
  58 struct nf_conntrack_expect *
  59 nf_conntrack_expect_find_get(const struct nf_conntrack_tuple *tuple);
  60
  61 struct nf_conntrack_expect *
  62 find_expectation(const struct nf_conntrack_tuple *tuple);
  63
  64 void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);
  65 void nf_ct_remove_expectations(struct nf_conn *ct);
  66 void nf_conntrack_unexpect_related(struct nf_conntrack_expect *exp);
  67
  68 /* Allocate space for an expectation: this is mandatory before calling
  69    nf_conntrack_expect_related.  You will have to call put afterwards. */
  70 struct nf_conntrack_expect *nf_conntrack_expect_alloc(struct nf_conn *me);
  71 void nf_conntrack_expect_put(struct nf_conntrack_expect *exp);
  72 int nf_conntrack_expect_related(struct nf_conntrack_expect *expect);
  73
  74 #endif /*_NF_CONNTRACK_EXPECT_H*/
  75