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 extern struct hlist_head *nf_ct_expect_hash;
  14
  15 struct nf_conntrack_expect {
  16         /* Conntrack expectation list member */
  17         struct hlist_node lnode;
  18
  19         /* Hash member */
  20         struct hlist_node hnode;
  21
  22         /* We expect this tuple, with the following mask */
  23         struct nf_conntrack_tuple tuple;
  24         struct nf_conntrack_tuple_mask mask;
  25
  26         /* Function to call after setup and insertion */
  27         void (*expectfn)(struct nf_conn *new,
  28                          struct nf_conntrack_expect *this);
  29
  30         /* Helper to assign to new connection */
  31         struct nf_conntrack_helper *helper;
  32
  33         /* The conntrack of the master connection */
  34         struct nf_conn *master;
  35
  36         /* Timer function; deletes the expectation. */
  37         struct timer_list timeout;
  38
  39         /* Usage count. */
  40         atomic_t use;
  41
  42         /* Flags */
  43         unsigned int flags;
  44
  45         /* Expectation class */
  46         unsigned int class;
  47
  48 #ifdef CONFIG_NF_NAT_NEEDED
  49         union nf_inet_addr saved_addr;
  50         /* This is the original per-proto part, used to map the
  51          * expected connection the way the recipient expects. */
  52         union nf_conntrack_man_proto saved_proto;
  53         /* Direction relative to the master connection. */
  54         enum ip_conntrack_dir dir;
  55 #endif
  56
  57         struct rcu_head rcu;
  58 };
  59
  60 static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
  61 {
  62         return nf_ct_net(exp->master);
  63 }
  64
  65 #define NF_CT_EXP_POLICY_NAME_LEN       16
  66
  67 struct nf_conntrack_expect_policy {
  68         unsigned int    max_expected;
  69         unsigned int    timeout;
  70         char            name[NF_CT_EXP_POLICY_NAME_LEN];
  71 };
  72
  73 #define NF_CT_EXPECT_CLASS_DEFAULT      0
  74
  75 int nf_conntrack_expect_pernet_init(struct net *net);
  76 void nf_conntrack_expect_pernet_fini(struct net *net);
  77
  78 int nf_conntrack_expect_init(void);
  79 void nf_conntrack_expect_fini(void);
  80
  81 struct nf_conntrack_expect *
  82 __nf_ct_expect_find(struct net *net,
  83                     const struct nf_conntrack_zone *zone,
  84                     const struct nf_conntrack_tuple *tuple);
  85
  86 struct nf_conntrack_expect *
  87 nf_ct_expect_find_get(struct net *net,
  88                       const struct nf_conntrack_zone *zone,
  89                       const struct nf_conntrack_tuple *tuple);
  90
  91 struct nf_conntrack_expect *
  92 nf_ct_find_expectation(struct net *net,
  93                        const struct nf_conntrack_zone *zone,
  94                        const struct nf_conntrack_tuple *tuple);
  95
  96 void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
  97                                 u32 portid, int report);
  98 static inline void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
  99 {
 100         nf_ct_unlink_expect_report(exp, 0, 0);
 101 }
 102
 103 void nf_ct_remove_expectations(struct nf_conn *ct);
 104 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
 105
 106 /* Allocate space for an expectation: this is mandatory before calling
 107    nf_ct_expect_related.  You will have to call put afterwards. */
 108 struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
 109 void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
 110                        const union nf_inet_addr *,
 111                        const union nf_inet_addr *,
 112                        u_int8_t, const __be16 *, const __be16 *);
 113 void nf_ct_expect_put(struct nf_conntrack_expect *exp);
 114 int nf_ct_expect_related_report(struct nf_conntrack_expect *expect,
 115                                 u32 portid, int report);
 116 static inline int nf_ct_expect_related(struct nf_conntrack_expect *expect)
 117 {
 118         return nf_ct_expect_related_report(expect, 0, 0);
 119 }
 120
 121 #endif /*_NF_CONNTRACK_EXPECT_H*/
 122