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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 
 15 struct module;
 16 
 17 #define NF_CT_HELPER_NAME_LEN   16
 18 
 19 struct nf_conntrack_helper
 20 {
 21         struct hlist_node hnode;        /* Internal use. */
 22 
 23         const char *name;               /* name of the module */
 24         struct module *me;              /* pointer to self */
 25         const struct nf_conntrack_expect_policy *expect_policy;
 26 
 27         /* Tuple of things we will help (compared against server response) */
 28         struct nf_conntrack_tuple tuple;
 29 
 30         /* Function to call when data passes; return verdict, or -1 to
 31            invalidate. */
 32         int (*help)(struct sk_buff *skb,
 33                     unsigned int protoff,
 34                     struct nf_conn *ct,
 35                     enum ip_conntrack_info conntrackinfo);
 36 
 37         void (*destroy)(struct nf_conn *ct);
 38 
 39         int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
 40         unsigned int expect_class_max;
 41 };
 42 
 43 extern struct nf_conntrack_helper *
 44 __nf_conntrack_helper_find_byname(const char *name);
 45 
 46 extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
 47 extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
 48 
 49 extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
 50 
 51 extern int __nf_ct_try_assign_helper(struct nf_conn *ct, gfp_t flags);
 52 
 53 extern void nf_ct_helper_destroy(struct nf_conn *ct);
 54 
 55 static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
 56 {
 57         return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
 58 }
 59 
 60 extern int nf_conntrack_helper_init(void);
 61 extern void nf_conntrack_helper_fini(void);
 62 
 63 #endif /*_NF_CONNTRACK_HELPER_H*/
 64 

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