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Release 4.12 include/net/netfilter/nf_conntrack_helper.h

/*
 * 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 <linux/refcount.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_expect.h>

struct module;


enum nf_ct_helper_flags {
	
NF_CT_HELPER_F_USERSPACE	= (1 << 0),
	
NF_CT_HELPER_F_CONFIGURED	= (1 << 1),
};


#define NF_CT_HELPER_NAME_LEN	16


struct nf_conntrack_helper {
	
struct hlist_node hnode;	/* Internal use. */

	
char name[NF_CT_HELPER_NAME_LEN]; /* name of the module */
	
refcount_t refcnt;
	
struct module *me;		/* pointer to self */
	
const struct nf_conntrack_expect_policy *expect_policy;

	/* 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 *skb,
		    unsigned int protoff,
		    struct nf_conn *ct,
		    enum ip_conntrack_info conntrackinfo);

	
void (*destroy)(struct nf_conn *ct);

	
int (*from_nlattr)(struct nlattr *attr, struct nf_conn *ct);
	
int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
	
unsigned int expect_class_max;

	
unsigned int flags;

	/* For user-space helpers: */
	
unsigned int queue_num;
	/* length of userspace private data stored in nf_conn_help->data */
	
u16 data_len;
};

/* Must be kept in sync with the classes defined by helpers */

#define NF_CT_MAX_EXPECT_CLASSES	4

/* nf_conn feature for connections that have a helper */

struct nf_conn_help {
	/* Helper. if any */
	
struct nf_conntrack_helper __rcu *helper;

	
struct hlist_head expectations;

	/* Current number of expected connections */
	
u8 expecting[NF_CT_MAX_EXPECT_CLASSES];

	/* private helper information. */
	char data[32] __aligned(8);
};


#define NF_CT_HELPER_BUILD_BUG_ON(structsize) \
	BUILD_BUG_ON((structsize) > FIELD_SIZEOF(struct nf_conn_help, data))

struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
						       u16 l3num, u8 protonum);

struct nf_conntrack_helper *nf_conntrack_helper_try_module_get(const char *name,
							       u16 l3num,
							       u8 protonum);
void nf_conntrack_helper_put(struct nf_conntrack_helper *helper);

void nf_ct_helper_init(struct nf_conntrack_helper *helper,
		       u16 l3num, u16 protonum, const char *name,
		       u16 default_port, u16 spec_port, u32 id,
		       const struct nf_conntrack_expect_policy *exp_pol,
		       u32 expect_class_max,
		       int (*help)(struct sk_buff *skb, unsigned int protoff,
				   struct nf_conn *ct,
				   enum ip_conntrack_info ctinfo),
		       int (*from_nlattr)(struct nlattr *attr,
					  struct nf_conn *ct),
		       struct module *module);

int nf_conntrack_helper_register(struct nf_conntrack_helper *);
void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);

int nf_conntrack_helpers_register(struct nf_conntrack_helper *, unsigned int);
void nf_conntrack_helpers_unregister(struct nf_conntrack_helper *,
				     unsigned int);

struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct,
					  struct nf_conntrack_helper *helper,
					  gfp_t gfp);

int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
			      gfp_t flags);

void nf_ct_helper_destroy(struct nf_conn *ct);


static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct) { return nf_ct_ext_find(ct, NF_CT_EXT_HELPER); }

Contributors

PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai23100.00%1100.00%
Total23100.00%1100.00%


static inline void *nfct_help_data(const struct nf_conn *ct) { struct nf_conn_help *help; help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); return (void *)help->data; }

Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso37100.00%1100.00%
Total37100.00%1100.00%

int nf_conntrack_helper_pernet_init(struct net *net); void nf_conntrack_helper_pernet_fini(struct net *net); int nf_conntrack_helper_init(void); void nf_conntrack_helper_fini(void); int nf_conntrack_broadcast_help(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int timeout); struct nf_ct_helper_expectfn { struct list_head head; const char *name; void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp); }; __printf(3,4) void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct, const char *fmt, ...); void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n); void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n); struct nf_ct_helper_expectfn * nf_ct_helper_expectfn_find_by_name(const char *name); struct nf_ct_helper_expectfn * nf_ct_helper_expectfn_find_by_symbol(const void *symbol); extern struct hlist_head *nf_ct_helper_hash; extern unsigned int nf_ct_helper_hsize; #endif /*_NF_CONNTRACK_HELPER_H*/

Overall Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso24136.46%927.27%
Gao Feng12118.31%26.06%
Yasuyuki Kozakai10616.04%26.06%
Patrick McHardy7611.50%1030.30%
Florian Westphal538.02%39.09%
Jiri Olsa263.93%13.03%
Liping Zhang152.27%26.06%
Martin Josefsson101.51%13.03%
Eric Leblond81.21%13.03%
Holger Eitzenberger40.61%13.03%
Herbert Xu10.15%13.03%
Total661100.00%33100.00%
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