kernel/2.6.29.6-aldebaran-rt/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 unsigned int nf_ct_expect_hsize;
  10 extern unsigned int nf_ct_expect_max;
  11
  12 struct nf_conntrack_expect
  13 {
  14         /* Conntrack expectation list member */
  15         struct hlist_node lnode;
  16
  17         /* Hash member */
  18         struct hlist_node hnode;
  19
  20         /* We expect this tuple, with the following mask */
  21         struct nf_conntrack_tuple tuple;
  22         struct nf_conntrack_tuple_mask mask;
  23
  24         /* Function to call after setup and insertion */
  25         void (*expectfn)(struct nf_conn *new,
  26                          struct nf_conntrack_expect *this);
  27
  28         /* Helper to assign to new connection */
  29         struct nf_conntrack_helper *helper;
  30
  31         /* The conntrack of the master connection */
  32         struct nf_conn *master;
  33
  34         /* Timer function; deletes the expectation. */
  35         struct timer_list timeout;
  36
  37         /* Usage count. */
  38         atomic_t use;
  39
  40         /* Flags */
  41         unsigned int flags;
  42
  43         /* Expectation class */
  44         unsigned int class;
  45
  46 #ifdef CONFIG_NF_NAT_NEEDED
  47         __be32 saved_ip;
  48         /* This is the original per-proto part, used to map the
  49          * expected connection the way the recipient expects. */
  50         union nf_conntrack_man_proto saved_proto;
  51         /* Direction relative to the master connection. */
  52         enum ip_conntrack_dir dir;
  53 #endif
  54
  55         struct rcu_head rcu;
  56 };
  57
  58 static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
  59 {
  60 #ifdef CONFIG_NET_NS
  61         return exp->master->ct_net;     /* by definition */
  62 #else
  63         return &init_net;
  64 #endif
  65 }
  66
  67 struct nf_conntrack_expect_policy
  68 {
  69         unsigned int    max_expected;
  70         unsigned int    timeout;
  71 };
  72
  73 #define NF_CT_EXPECT_CLASS_DEFAULT      0
  74
  75 #define NF_CT_EXPECT_PERMANENT  0x1
  76 #define NF_CT_EXPECT_INACTIVE   0x2
  77
  78 int nf_conntrack_expect_init(struct net *net);
  79 void nf_conntrack_expect_fini(struct net *net);
  80
  81 struct nf_conntrack_expect *
  82 __nf_ct_expect_find(struct net *net, const struct nf_conntrack_tuple *tuple);
  83
  84 struct nf_conntrack_expect *
  85 nf_ct_expect_find_get(struct net *net, const struct nf_conntrack_tuple *tuple);
  86
  87 struct nf_conntrack_expect *
  88 nf_ct_find_expectation(struct net *net, const struct nf_conntrack_tuple *tuple);
  89
  90 void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);
  91 void nf_ct_remove_expectations(struct nf_conn *ct);
  92 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
  93
  94 /* Allocate space for an expectation: this is mandatory before calling
  95    nf_ct_expect_related.  You will have to call put afterwards. */
  96 struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
  97 void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
  98                        const union nf_inet_addr *,
  99                        const union nf_inet_addr *,
 100                        u_int8_t, const __be16 *, const __be16 *);
 101 void nf_ct_expect_put(struct nf_conntrack_expect *exp);
 102 int nf_ct_expect_related(struct nf_conntrack_expect *expect);
 103 int nf_ct_expect_related_report(struct nf_conntrack_expect *expect,
 104                                 u32 pid, int report);
 105
 106 #endif /*_NF_CONNTRACK_EXPECT_H*/
 107