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 <linux/refcount.h>
   9
  10 #include <net/netfilter/nf_conntrack.h>
  11 #include <net/netfilter/nf_conntrack_zones.h>
  12
  13 extern unsigned int nf_ct_expect_hsize;
  14 extern unsigned int nf_ct_expect_max;
  15 extern struct hlist_head *nf_ct_expect_hash;
  16
  17 struct nf_conntrack_expect {
  18         /* Conntrack expectation list member */
  19         struct hlist_node lnode;
  20
  21         /* Hash member */
  22         struct hlist_node hnode;
  23
  24         /* We expect this tuple, with the following mask */
  25         struct nf_conntrack_tuple tuple;
  26         struct nf_conntrack_tuple_mask mask;
  27
  28         /* Function to call after setup and insertion */
  29         void (*expectfn)(struct nf_conn *new,
  30                          struct nf_conntrack_expect *this);
  31
  32         /* Helper to assign to new connection */
  33         struct nf_conntrack_helper *helper;
  34
  35         /* The conntrack of the master connection */
  36         struct nf_conn *master;
  37
  38         /* Timer function; deletes the expectation. */
  39         struct timer_list timeout;
  40
  41         /* Usage count. */
  42         refcount_t use;
  43
  44         /* Flags */
  45         unsigned int flags;
  46
  47         /* Expectation class */
  48         unsigned int class;
  49
  50 #ifdef CONFIG_NF_NAT_NEEDED
  51         union nf_inet_addr saved_addr;
  52         /* This is the original per-proto part, used to map the
  53          * expected connection the way the recipient expects. */
  54         union nf_conntrack_man_proto saved_proto;
  55         /* Direction relative to the master connection. */
  56         enum ip_conntrack_dir dir;
  57 #endif
  58
  59         struct rcu_head rcu;
  60 };
  61
  62 static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
  63 {
  64         return nf_ct_net(exp->master);
  65 }
  66
  67 #define NF_CT_EXP_POLICY_NAME_LEN       16
  68
  69 struct nf_conntrack_expect_policy {
  70         unsigned int    max_expected;
  71         unsigned int    timeout;
  72         char            name[NF_CT_EXP_POLICY_NAME_LEN];
  73 };
  74
  75 #define NF_CT_EXPECT_CLASS_DEFAULT      0
  76 #define NF_CT_EXPECT_MAX_CNT            255
  77
  78 int nf_conntrack_expect_pernet_init(struct net *net);
  79 void nf_conntrack_expect_pernet_fini(struct net *net);
  80
  81 int nf_conntrack_expect_init(void);
  82 void nf_conntrack_expect_fini(void);
  83
  84 struct nf_conntrack_expect *
  85 __nf_ct_expect_find(struct net *net,
  86                     const struct nf_conntrack_zone *zone,
  87                     const struct nf_conntrack_tuple *tuple);
  88
  89 struct nf_conntrack_expect *
  90 nf_ct_expect_find_get(struct net *net,
  91                       const struct nf_conntrack_zone *zone,
  92                       const struct nf_conntrack_tuple *tuple);
  93
  94 struct nf_conntrack_expect *
  95 nf_ct_find_expectation(struct net *net,
  96                        const struct nf_conntrack_zone *zone,
  97                        const struct nf_conntrack_tuple *tuple);
  98
  99 void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
 100                                 u32 portid, int report);
 101 static inline void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
 102 {
 103         nf_ct_unlink_expect_report(exp, 0, 0);
 104 }
 105
 106 void nf_ct_remove_expectations(struct nf_conn *ct);
 107 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
 108 bool nf_ct_remove_expect(struct nf_conntrack_expect *exp);
 109
 110 void nf_ct_expect_iterate_destroy(bool (*iter)(struct nf_conntrack_expect *e, void *data), void *data);
 111 void nf_ct_expect_iterate_net(struct net *net,
 112                               bool (*iter)(struct nf_conntrack_expect *e, void *data),
 113                               void *data, u32 portid, int report);
 114
 115 /* Allocate space for an expectation: this is mandatory before calling
 116    nf_ct_expect_related.  You will have to call put afterwards. */
 117 struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
 118 void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
 119                        const union nf_inet_addr *,
 120                        const union nf_inet_addr *,
 121                        u_int8_t, const __be16 *, const __be16 *);
 122 void nf_ct_expect_put(struct nf_conntrack_expect *exp);
 123 int nf_ct_expect_related_report(struct nf_conntrack_expect *expect,
 124                                 u32 portid, int report);
 125 static inline int nf_ct_expect_related(struct nf_conntrack_expect *expect)
 126 {
 127         return nf_ct_expect_related_report(expect, 0, 0);
 128 }
 129
 130 #endif /*_NF_CONNTRACK_EXPECT_H*/
 131