linux/include/net/netfilter/nf_conntrack_helper.h
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   1/*
   2 * connection tracking helpers.
   3 *
   4 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
   5 *      - generalize L3 protocol dependent part.
   6 *
   7 * Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
   8 */
   9
  10#ifndef _NF_CONNTRACK_HELPER_H
  11#define _NF_CONNTRACK_HELPER_H
  12#include <net/netfilter/nf_conntrack.h>
  13#include <net/netfilter/nf_conntrack_extend.h>
  14#include <net/netfilter/nf_conntrack_expect.h>
  15
  16struct module;
  17
  18enum nf_ct_helper_flags {
  19        NF_CT_HELPER_F_USERSPACE        = (1 << 0),
  20        NF_CT_HELPER_F_CONFIGURED       = (1 << 1),
  21};
  22
  23#define NF_CT_HELPER_NAME_LEN   16
  24
  25struct nf_conntrack_helper {
  26        struct hlist_node hnode;        /* Internal use. */
  27
  28        char name[NF_CT_HELPER_NAME_LEN]; /* name of the module */
  29        struct module *me;              /* pointer to self */
  30        const struct nf_conntrack_expect_policy *expect_policy;
  31
  32        /* length of internal data, ie. sizeof(struct nf_ct_*_master) */
  33        size_t data_len;
  34
  35        /* Tuple of things we will help (compared against server response) */
  36        struct nf_conntrack_tuple tuple;
  37
  38        /* Function to call when data passes; return verdict, or -1 to
  39           invalidate. */
  40        int (*help)(struct sk_buff *skb,
  41                    unsigned int protoff,
  42                    struct nf_conn *ct,
  43                    enum ip_conntrack_info conntrackinfo);
  44
  45        void (*destroy)(struct nf_conn *ct);
  46
  47        int (*from_nlattr)(struct nlattr *attr, struct nf_conn *ct);
  48        int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
  49        unsigned int expect_class_max;
  50
  51        unsigned int flags;
  52        unsigned int queue_num;         /* For user-space helpers. */
  53};
  54
  55extern struct nf_conntrack_helper *
  56__nf_conntrack_helper_find(const char *name, u16 l3num, u8 protonum);
  57
  58extern struct nf_conntrack_helper *
  59nf_conntrack_helper_try_module_get(const char *name, u16 l3num, u8 protonum);
  60
  61extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
  62extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
  63
  64extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, struct nf_conntrack_helper *helper, gfp_t gfp);
  65
  66extern int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
  67                                     gfp_t flags);
  68
  69extern void nf_ct_helper_destroy(struct nf_conn *ct);
  70
  71static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
  72{
  73        return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
  74}
  75
  76static inline void *nfct_help_data(const struct nf_conn *ct)
  77{
  78        struct nf_conn_help *help;
  79
  80        help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
  81
  82        return (void *)help->data;
  83}
  84
  85extern int nf_conntrack_helper_pernet_init(struct net *net);
  86extern void nf_conntrack_helper_pernet_fini(struct net *net);
  87
  88extern int nf_conntrack_helper_init(void);
  89extern void nf_conntrack_helper_fini(void);
  90
  91extern int nf_conntrack_broadcast_help(struct sk_buff *skb,
  92                                       unsigned int protoff,
  93                                       struct nf_conn *ct,
  94                                       enum ip_conntrack_info ctinfo,
  95                                       unsigned int timeout);
  96
  97struct nf_ct_helper_expectfn {
  98        struct list_head head;
  99        const char *name;
 100        void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
 101};
 102
 103__printf(3,4)
 104void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct,
 105                      const char *fmt, ...);
 106
 107void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
 108void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
 109struct nf_ct_helper_expectfn *
 110nf_ct_helper_expectfn_find_by_name(const char *name);
 111struct nf_ct_helper_expectfn *
 112nf_ct_helper_expectfn_find_by_symbol(const void *symbol);
 113
 114extern struct hlist_head *nf_ct_helper_hash;
 115extern unsigned int nf_ct_helper_hsize;
 116
 117#endif /*_NF_CONNTRACK_HELPER_H*/
 118
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