4e77be4637
There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*
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* connection tracking helpers.
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*
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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - generalize L3 protocol dependent part.
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*
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* Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
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*/
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#ifndef _NF_CONNTRACK_HELPER_H
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#define _NF_CONNTRACK_HELPER_H
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_extend.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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struct module;
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enum nf_ct_helper_flags {
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NF_CT_HELPER_F_USERSPACE = (1 << 0),
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NF_CT_HELPER_F_CONFIGURED = (1 << 1),
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};
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#define NF_CT_HELPER_NAME_LEN 16
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struct nf_conntrack_helper {
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struct hlist_node hnode; /* Internal use. */
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char name[NF_CT_HELPER_NAME_LEN]; /* name of the module */
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struct module *me; /* pointer to self */
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const struct nf_conntrack_expect_policy *expect_policy;
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/* length of internal data, ie. sizeof(struct nf_ct_*_master) */
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size_t data_len;
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/* Tuple of things we will help (compared against server response) */
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struct nf_conntrack_tuple tuple;
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/* Function to call when data passes; return verdict, or -1 to
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invalidate. */
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int (*help)(struct sk_buff *skb,
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unsigned int protoff,
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struct nf_conn *ct,
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enum ip_conntrack_info conntrackinfo);
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void (*destroy)(struct nf_conn *ct);
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int (*from_nlattr)(struct nlattr *attr, struct nf_conn *ct);
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int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
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unsigned int expect_class_max;
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unsigned int flags;
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unsigned int queue_num; /* For user-space helpers. */
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};
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struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
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u16 l3num, u8 protonum);
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struct nf_conntrack_helper *nf_conntrack_helper_try_module_get(const char *name,
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u16 l3num,
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u8 protonum);
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int nf_conntrack_helper_register(struct nf_conntrack_helper *);
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void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
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struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct,
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struct nf_conntrack_helper *helper,
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gfp_t gfp);
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int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
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gfp_t flags);
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void nf_ct_helper_destroy(struct nf_conn *ct);
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static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
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{
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return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
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}
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static inline void *nfct_help_data(const struct nf_conn *ct)
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{
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struct nf_conn_help *help;
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help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
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return (void *)help->data;
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}
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int nf_conntrack_helper_pernet_init(struct net *net);
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void nf_conntrack_helper_pernet_fini(struct net *net);
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int nf_conntrack_helper_init(void);
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void nf_conntrack_helper_fini(void);
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int nf_conntrack_broadcast_help(struct sk_buff *skb, unsigned int protoff,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int timeout);
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struct nf_ct_helper_expectfn {
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struct list_head head;
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const char *name;
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void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
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};
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__printf(3,4)
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void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct,
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const char *fmt, ...);
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void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
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void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
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struct nf_ct_helper_expectfn *
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nf_ct_helper_expectfn_find_by_name(const char *name);
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struct nf_ct_helper_expectfn *
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nf_ct_helper_expectfn_find_by_symbol(const void *symbol);
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extern struct hlist_head *nf_ct_helper_hash;
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extern unsigned int nf_ct_helper_hsize;
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#endif /*_NF_CONNTRACK_HELPER_H*/
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