LXR linux/include/net/netfilter/nf_conntrack

   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
  11extern unsigned int nf_ct_expect_hsize;
  12extern unsigned int nf_ct_expect_max;
  13
  14struct 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
  59static 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
  66struct 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
  74int nf_conntrack_expect_pernet_init(struct net *net);
  75void nf_conntrack_expect_pernet_fini(struct net *net);
  76
  77int nf_conntrack_expect_init(void);
  78void nf_conntrack_expect_fini(void);
  79
  80struct 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
  85struct nf_conntrack_expect *
  86nf_ct_expect_find_get(struct net *net,
  87                      const struct nf_conntrack_zone *zone,
  88                      const struct nf_conntrack_tuple *tuple);
  89
  90struct nf_conntrack_expect *
  91nf_ct_find_expectation(struct net *net,
  92                       const struct nf_conntrack_zone *zone,
  93                       const struct nf_conntrack_tuple *tuple);
  94
  95void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
  96                                u32 portid, int report);
  97static inline void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
  98{
  99        nf_ct_unlink_expect_report(exp, 0, 0);
 100}
 101
 102void nf_ct_remove_expectations(struct nf_conn *ct);
 103void 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. */
 107struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
 108void 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 *);
 112void nf_ct_expect_put(struct nf_conntrack_expect *exp);
 113int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, 
 114                                u32 portid, int report);
 115static 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
 122