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   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         /* Expectation class */
  45         unsigned int class;
  46
  47 #ifdef CONFIG_NF_NAT_NEEDED
  48         __be32 saved_ip;
  49         /* This is the original per-proto part, used to map the
  50          * expected connection the way the recipient expects. */
  51         union nf_conntrack_man_proto saved_proto;
  52         /* Direction relative to the master connection. */
  53         enum ip_conntrack_dir dir;
  54 #endif
  55
  56         struct rcu_head rcu;
  57 };
  58
  59 struct nf_conntrack_expect_policy
  60 {
  61         unsigned int    max_expected;
  62         unsigned int    timeout;
  63 };
  64
  65 #define NF_CT_EXPECT_CLASS_DEFAULT      0
  66
  67 #define NF_CT_EXPECT_PERMANENT  0x1
  68 #define NF_CT_EXPECT_INACTIVE   0x2
  69
  70 int nf_conntrack_expect_init(void);
  71 void nf_conntrack_expect_fini(void);
  72
  73 struct nf_conntrack_expect *
  74 __nf_ct_expect_find(const struct nf_conntrack_tuple *tuple);
  75
  76 struct nf_conntrack_expect *
  77 nf_ct_expect_find_get(const struct nf_conntrack_tuple *tuple);
  78
  79 struct nf_conntrack_expect *
  80 nf_ct_find_expectation(const struct nf_conntrack_tuple *tuple);
  81
  82 void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);
  83 void nf_ct_remove_expectations(struct nf_conn *ct);
  84 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
  85
  86 /* Allocate space for an expectation: this is mandatory before calling
  87    nf_ct_expect_related.  You will have to call put afterwards. */
  88 struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
  89 void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
  90                        const union nf_inet_addr *,
  91                        const union nf_inet_addr *,
  92                        u_int8_t, const __be16 *, const __be16 *);
  93 void nf_ct_expect_put(struct nf_conntrack_expect *exp);
  94 int nf_ct_expect_related(struct nf_conntrack_expect *expect);
  95
  96 #endif /*_NF_CONNTRACK_EXPECT_H*/
  97