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
   8 #include <net/netfilter/nf_conntrack.h>
   9 #include <net/netfilter/nf_conntrack_zones.h>
  10
  11 extern unsigned int nf_ct_expect_hsize;
  12 extern unsigned int nf_ct_expect_max;
  13
  14 struct nf_conntrack_expect {
  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         union nf_inet_addr saved_addr;
  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 static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
  60 {
  61         return nf_ct_net(exp->master);
  62 }
  63
  64 #define NF_CT_EXP_POLICY_NAME_LEN       16
  65
  66 struct nf_conntrack_expect_policy {
  67         unsigned int    max_expected;
  68         unsigned int    timeout;
  69         char            name[NF_CT_EXP_POLICY_NAME_LEN];
  70 };
  71
  72 #define NF_CT_EXPECT_CLASS_DEFAULT      0
  73
  74 int nf_conntrack_expect_pernet_init(struct net *net);
  75 void nf_conntrack_expect_pernet_fini(struct net *net);
  76
  77 int nf_conntrack_expect_init(void);
  78 void nf_conntrack_expect_fini(void);
  79
  80 struct nf_conntrack_expect *
  81 __nf_ct_expect_find(struct net *net,
  82                     const struct nf_conntrack_zone *zone,
  83                     const struct nf_conntrack_tuple *tuple);
  84
  85 struct nf_conntrack_expect *
  86 nf_ct_expect_find_get(struct net *net,
  87                       const struct nf_conntrack_zone *zone,
  88                       const struct nf_conntrack_tuple *tuple);
  89
  90 struct nf_conntrack_expect *
  91 nf_ct_find_expectation(struct net *net,
  92                        const struct nf_conntrack_zone *zone,
  93                        const struct nf_conntrack_tuple *tuple);
  94
  95 void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
  96                                 u32 portid, int report);
  97 static inline void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
  98 {
  99         nf_ct_unlink_expect_report(exp, 0, 0);
 100 }
 101
 102 void nf_ct_remove_expectations(struct nf_conn *ct);
 103 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
 104
 105 /* Allocate space for an expectation: this is mandatory before calling
 106    nf_ct_expect_related.  You will have to call put afterwards. */
 107 struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
 108 void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
 109                        const union nf_inet_addr *,
 110                        const union nf_inet_addr *,
 111                        u_int8_t, const __be16 *, const __be16 *);
 112 void nf_ct_expect_put(struct nf_conntrack_expect *exp);
 113 int nf_ct_expect_related_report(struct nf_conntrack_expect *expect,
 114                                 u32 portid, int report);
 115 static inline int nf_ct_expect_related(struct nf_conntrack_expect *expect)
 116 {
 117         return nf_ct_expect_related_report(expect, 0, 0);
 118 }
 119
 120 #endif /*_NF_CONNTRACK_EXPECT_H*/
 121