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         /* Conntrack expectation list member */
  14         struct hlist_node lnode;
  15
  16         /* Hash member */
  17         struct hlist_node hnode;
  18
  19         /* We expect this tuple, with the following mask */
  20         struct nf_conntrack_tuple tuple;
  21         struct nf_conntrack_tuple_mask mask;
  22
  23         /* Function to call after setup and insertion */
  24         void (*expectfn)(struct nf_conn *new,
  25                          struct nf_conntrack_expect *this);
  26
  27         /* Helper to assign to new connection */
  28         struct nf_conntrack_helper *helper;
  29
  30         /* The conntrack of the master connection */
  31         struct nf_conn *master;
  32
  33         /* Timer function; deletes the expectation. */
  34         struct timer_list timeout;
  35
  36         /* Usage count. */
  37         atomic_t use;
  38
  39         /* Flags */
  40         unsigned int flags;
  41
  42         /* Expectation class */
  43         unsigned int class;
  44
  45 #ifdef CONFIG_NF_NAT_NEEDED
  46         __be32 saved_ip;
  47         /* This is the original per-proto part, used to map the
  48          * expected connection the way the recipient expects. */
  49         union nf_conntrack_man_proto saved_proto;
  50         /* Direction relative to the master connection. */
  51         enum ip_conntrack_dir dir;
  52 #endif
  53
  54         struct rcu_head rcu;
  55 };
  56
  57 static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
  58 {
  59         return nf_ct_net(exp->master);
  60 }
  61
  62 struct nf_conntrack_expect_policy {
  63         unsigned int    max_expected;
  64         unsigned int    timeout;
  65         const char      *name;
  66 };
  67
  68 #define NF_CT_EXPECT_CLASS_DEFAULT      0
  69
  70 int nf_conntrack_expect_init(struct net *net);
  71 void nf_conntrack_expect_fini(struct net *net);
  72
  73 struct nf_conntrack_expect *
  74 __nf_ct_expect_find(struct net *net, u16 zone,
  75                     const struct nf_conntrack_tuple *tuple);
  76
  77 struct nf_conntrack_expect *
  78 nf_ct_expect_find_get(struct net *net, u16 zone,
  79                       const struct nf_conntrack_tuple *tuple);
  80
  81 struct nf_conntrack_expect *
  82 nf_ct_find_expectation(struct net *net, u16 zone,
  83                        const struct nf_conntrack_tuple *tuple);
  84
  85 void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
  86                                 u32 pid, int report);
  87 static inline void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
  88 {
  89         nf_ct_unlink_expect_report(exp, 0, 0);
  90 }
  91
  92 void nf_ct_remove_expectations(struct nf_conn *ct);
  93 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
  94 void nf_ct_remove_userspace_expectations(void);
  95
  96 /* Allocate space for an expectation: this is mandatory before calling
  97    nf_ct_expect_related.  You will have to call put afterwards. */
  98 struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
  99 void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
 100                        const union nf_inet_addr *,
 101                        const union nf_inet_addr *,
 102                        u_int8_t, const __be16 *, const __be16 *);
 103 void nf_ct_expect_put(struct nf_conntrack_expect *exp);
 104 int nf_ct_expect_related_report(struct nf_conntrack_expect *expect,
 105                                 u32 pid, int report);
 106 static inline int nf_ct_expect_related(struct nf_conntrack_expect *expect)
 107 {
 108         return nf_ct_expect_related_report(expect, 0, 0);
 109 }
 110
 111 #endif /*_NF_CONNTRACK_EXPECT_H*/
 112