| /* |
| * connection tracking helpers. |
| * |
| * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> |
| * - generalize L3 protocol dependent part. |
| * |
| * Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h |
| */ |
| |
| #ifndef _NF_CONNTRACK_HELPER_H |
| #define _NF_CONNTRACK_HELPER_H |
| #include <net/netfilter/nf_conntrack.h> |
| #include <net/netfilter/nf_conntrack_extend.h> |
| |
| struct module; |
| |
| struct nf_conntrack_helper |
| { |
| struct hlist_node hnode; /* Internal use. */ |
| |
| const char *name; /* name of the module */ |
| struct module *me; /* pointer to self */ |
| unsigned int max_expected; /* Maximum number of concurrent |
| * expected connections */ |
| unsigned int timeout; /* timeout for expecteds */ |
| |
| /* Tuple of things we will help (compared against server response) */ |
| struct nf_conntrack_tuple tuple; |
| |
| /* Function to call when data passes; return verdict, or -1 to |
| invalidate. */ |
| int (*help)(struct sk_buff **pskb, |
| unsigned int protoff, |
| struct nf_conn *ct, |
| enum ip_conntrack_info conntrackinfo); |
| |
| void (*destroy)(struct nf_conn *ct); |
| |
| int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct); |
| }; |
| |
| extern struct nf_conntrack_helper * |
| __nf_ct_helper_find(const struct nf_conntrack_tuple *tuple); |
| |
| extern struct nf_conntrack_helper * |
| nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple); |
| |
| extern struct nf_conntrack_helper * |
| __nf_conntrack_helper_find_byname(const char *name); |
| |
| extern void nf_ct_helper_put(struct nf_conntrack_helper *helper); |
| extern int nf_conntrack_helper_register(struct nf_conntrack_helper *); |
| extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *); |
| |
| extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp); |
| |
| static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct) |
| { |
| return nf_ct_ext_find(ct, NF_CT_EXT_HELPER); |
| } |
| #endif /*_NF_CONNTRACK_HELPER_H*/ |