[mirror_ubuntu-bionic-kernel.git] / include / linux / netfilter.h

#ifndef __LINUX_NETFILTER_H
#define __LINUX_NETFILTER_H

#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/net.h>
#include <linux/if.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <linux/static_key.h>
#include <linux/netfilter_defs.h>
#include <linux/netdevice.h>
#include <net/net_namespace.h>

#ifdef CONFIG_NETFILTER
static inline int NF_DROP_GETERR(int verdict)
{
	return -(verdict >> NF_VERDICT_QBITS);
}

static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
				   const union nf_inet_addr *a2)
{
	return a1->all[0] == a2->all[0] &&
	       a1->all[1] == a2->all[1] &&
	       a1->all[2] == a2->all[2] &&
	       a1->all[3] == a2->all[3];
}

static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
				     union nf_inet_addr *result,
				     const union nf_inet_addr *mask)
{
	result->all[0] = a1->all[0] & mask->all[0];
	result->all[1] = a1->all[1] & mask->all[1];
	result->all[2] = a1->all[2] & mask->all[2];
	result->all[3] = a1->all[3] & mask->all[3];
}

int netfilter_init(void);

struct sk_buff;

struct nf_hook_ops;

struct sock;

struct nf_hook_state {
	unsigned int hook;
	int thresh;
	u_int8_t pf;
	struct net_device *in;
	struct net_device *out;
	struct sock *sk;
	struct net *net;
	struct list_head *hook_list;
	int (*okfn)(struct net *, struct sock *, struct sk_buff *);
};

static inline void nf_hook_state_init(struct nf_hook_state *p,
				      struct list_head *hook_list,
				      unsigned int hook,
				      int thresh, u_int8_t pf,
				      struct net_device *indev,
				      struct net_device *outdev,
				      struct sock *sk,
				      struct net *net,
				      int (*okfn)(struct net *, struct sock *, struct sk_buff *))
{
	p->hook = hook;
	p->thresh = thresh;
	p->pf = pf;
	p->in = indev;
	p->out = outdev;
	p->sk = sk;
	p->net = net;
	p->hook_list = hook_list;
	p->okfn = okfn;
}

typedef unsigned int nf_hookfn(void *priv,
			       struct sk_buff *skb,
			       const struct nf_hook_state *state);

struct nf_hook_ops {
	struct list_head 	list;

	/* User fills in from here down. */
	nf_hookfn		*hook;
	struct net_device	*dev;
	struct module		*owner;
	void			*priv;
	u_int8_t		pf;
	unsigned int		hooknum;
	/* Hooks are ordered in ascending priority. */
	int			priority;
};

struct nf_sockopt_ops {
	struct list_head list;

	u_int8_t pf;

	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	int set_optmin;
	int set_optmax;
	int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
#ifdef CONFIG_COMPAT
	int (*compat_set)(struct sock *sk, int optval,
			void __user *user, unsigned int len);
#endif
	int get_optmin;
	int get_optmax;
	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
#ifdef CONFIG_COMPAT
	int (*compat_get)(struct sock *sk, int optval,
			void __user *user, int *len);
#endif
	/* Use the module struct to lock set/get code in place */
	struct module *owner;
};

/* Function to register/unregister hook points. */
int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops);
void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops);
int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
			  unsigned int n);
void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
			     unsigned int n);

int nf_register_hook(struct nf_hook_ops *reg);
void nf_unregister_hook(struct nf_hook_ops *reg);
int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);

/* Functions to register get/setsockopt ranges (non-inclusive).  You
   need to check permissions yourself! */
int nf_register_sockopt(struct nf_sockopt_ops *reg);
void nf_unregister_sockopt(struct nf_sockopt_ops *reg);

#ifdef HAVE_JUMP_LABEL
extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];

static inline bool nf_hook_list_active(struct list_head *hook_list,
				       u_int8_t pf, unsigned int hook)
{
	if (__builtin_constant_p(pf) &&
	    __builtin_constant_p(hook))
		return static_key_false(&nf_hooks_needed[pf][hook]);

	return !list_empty(hook_list);
}
#else
static inline bool nf_hook_list_active(struct list_head *hook_list,
				       u_int8_t pf, unsigned int hook)
{
	return !list_empty(hook_list);
}
#endif

int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state);

/**
 *	nf_hook_thresh - call a netfilter hook
 *
 *	Returns 1 if the hook has allowed the packet to pass.  The function
 *	okfn must be invoked by the caller in this case.  Any other return
 *	value indicates the packet has been consumed by the hook.
 */
static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
				 struct net *net,
				 struct sock *sk,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
				 int thresh)
{
	struct list_head *hook_list = &net->nf.hooks[pf][hook];

	if (nf_hook_list_active(hook_list, pf, hook)) {
		struct nf_hook_state state;

		nf_hook_state_init(&state, hook_list, hook, thresh,
				   pf, indev, outdev, sk, net, okfn);
		return nf_hook_slow(skb, &state);
	}
	return 1;
}

static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
			  struct sock *sk, struct sk_buff *skb,
			  struct net_device *indev, struct net_device *outdev,
			  int (*okfn)(struct net *, struct sock *, struct sk_buff *))
{
	return nf_hook_thresh(pf, hook, net, sk, skb, indev, outdev, okfn, INT_MIN);
}
                   
/* Activate hook; either okfn or kfree_skb called, unless a hook
   returns NF_STOLEN (in which case, it's up to the hook to deal with
   the consequences).

   Returns -ERRNO if packet dropped.  Zero means queued, stolen or
   accepted.
*/

/* RR:
   > I don't want nf_hook to return anything because people might forget
   > about async and trust the return value to mean "packet was ok".

   AK:
   Just document it clearly, then you can expect some sense from kernel
   coders :)
*/

static inline int
NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
	       struct sk_buff *skb, struct net_device *in,
	       struct net_device *out,
	       int (*okfn)(struct net *, struct sock *, struct sk_buff *),
	       int thresh)
{
	int ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, thresh);
	if (ret == 1)
		ret = okfn(net, sk, skb);
	return ret;
}

static inline int
NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
	     struct sk_buff *skb, struct net_device *in, struct net_device *out,
	     int (*okfn)(struct net *, struct sock *, struct sk_buff *),
	     bool cond)
{
	int ret;

	if (!cond ||
	    ((ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, INT_MIN)) == 1))
		ret = okfn(net, sk, skb);
	return ret;
}

static inline int
NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb,
	struct net_device *in, struct net_device *out,
	int (*okfn)(struct net *, struct sock *, struct sk_buff *))
{
	return NF_HOOK_THRESH(pf, hook, net, sk, skb, in, out, okfn, INT_MIN);
}

/* Call setsockopt() */
int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
		  unsigned int len);
int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
		  int *len);
#ifdef CONFIG_COMPAT
int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
		char __user *opt, unsigned int len);
int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
		char __user *opt, int *len);
#endif

/* Call this before modifying an existing packet: ensures it is
   modifiable and linear to the point you care about (writable_len).
   Returns true or false. */
int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);

struct flowi;
struct nf_queue_entry;

struct nf_afinfo {
	unsigned short	family;
	__sum16		(*checksum)(struct sk_buff *skb, unsigned int hook,
				    unsigned int dataoff, u_int8_t protocol);
	__sum16		(*checksum_partial)(struct sk_buff *skb,
					    unsigned int hook,
					    unsigned int dataoff,
					    unsigned int len,
					    u_int8_t protocol);
	int		(*route)(struct net *net, struct dst_entry **dst,
				 struct flowi *fl, bool strict);
	void		(*saveroute)(const struct sk_buff *skb,
				     struct nf_queue_entry *entry);
	int		(*reroute)(struct sk_buff *skb,
				   const struct nf_queue_entry *entry);
	int		route_key_size;
};

extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
{
	return rcu_dereference(nf_afinfo[family]);
}

static inline __sum16
nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	    u_int8_t protocol, unsigned short family)
{
	const struct nf_afinfo *afinfo;
	__sum16 csum = 0;

	rcu_read_lock();
	afinfo = nf_get_afinfo(family);
	if (afinfo)
		csum = afinfo->checksum(skb, hook, dataoff, protocol);
	rcu_read_unlock();
	return csum;
}

static inline __sum16
nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
		    unsigned int dataoff, unsigned int len,
		    u_int8_t protocol, unsigned short family)
{
	const struct nf_afinfo *afinfo;
	__sum16 csum = 0;

	rcu_read_lock();
	afinfo = nf_get_afinfo(family);
	if (afinfo)
		csum = afinfo->checksum_partial(skb, hook, dataoff, len,
						protocol);
	rcu_read_unlock();
	return csum;
}

int nf_register_afinfo(const struct nf_afinfo *afinfo);
void nf_unregister_afinfo(const struct nf_afinfo *afinfo);

#include <net/flow.h>
extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);

static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
{
#ifdef CONFIG_NF_NAT_NEEDED
	void (*decodefn)(struct sk_buff *, struct flowi *);

	rcu_read_lock();
	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	if (decodefn)
		decodefn(skb, fl);
	rcu_read_unlock();
#endif
}

#else /* !CONFIG_NETFILTER */
#define NF_HOOK(pf, hook, net, sk, skb, indev, outdev, okfn) (okfn)(net, sk, skb)
#define NF_HOOK_COND(pf, hook, net, sk, skb, indev, outdev, okfn, cond) (okfn)(net, sk, skb)
static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
			  struct sock *sk, struct sk_buff *skb,
			  struct net_device *indev, struct net_device *outdev,
			  int (*okfn)(struct net *, struct sock *, struct sk_buff *))
{
	return 1;
}
struct flowi;
static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
{
}
#endif /*CONFIG_NETFILTER*/

#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
#include <linux/netfilter/nf_conntrack_zones_common.h>

extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;
void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;

struct nf_conn;
enum ip_conntrack_info;
struct nlattr;

struct nfq_ct_hook {
	size_t (*build_size)(const struct nf_conn *ct);
	int (*build)(struct sk_buff *skb, struct nf_conn *ct);
	int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
	int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct,
			     u32 portid, u32 report);
	void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
			   enum ip_conntrack_info ctinfo, s32 off);
};
extern struct nfq_ct_hook __rcu *nfq_ct_hook;
#else
static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
#endif

/**
 * nf_skb_duplicated - TEE target has sent a packet
 *
 * When a xtables target sends a packet, the OUTPUT and POSTROUTING
 * hooks are traversed again, i.e. nft and xtables are invoked recursively.
 *
 * This is used by xtables TEE target to prevent the duplicated skb from
 * being duplicated again.
 */
DECLARE_PER_CPU(bool, nf_skb_duplicated);

#endif /*__LINUX_NETFILTER_H*/
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_NETFILTER_H
	2	#define __LINUX_NETFILTER_H
	3
1da177e4	4	#include <linux/init.h>
1da177e4 LT	5	#include <linux/skbuff.h>
	6	#include <linux/net.h>
	7	#include <linux/if.h>
2e3075a2 JE	8	#include <linux/in.h>
2e3075a2 JE	9	#include <linux/in6.h>
1da177e4 LT	10	#include <linux/wait.h>
1da177e4 LT	11	#include <linux/list.h>
d1c85c2e	12	#include <linux/static_key.h>
a263653e	13	#include <linux/netfilter_defs.h>
085db2c0 EB	14	#include <linux/netdevice.h>
085db2c0 EB	15	#include <net/net_namespace.h>
a263653e	16
1da177e4	17	#ifdef CONFIG_NETFILTER
f615df76 FW	18	static inline int NF_DROP_GETERR(int verdict)
	19	{
	20	return -(verdict >> NF_VERDICT_QBITS);
	21	}
1da177e4	22
b8beedd2 PM	23	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	24	const union nf_inet_addr *a2)
	25	{
	26	return a1->all[0] == a2->all[0] &&
	27	a1->all[1] == a2->all[1] &&
	28	a1->all[2] == a2->all[2] &&
	29	a1->all[3] == a2->all[3];
	30	}
	31
efdedd54 DF	32	static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
	33	union nf_inet_addr *result,
	34	const union nf_inet_addr *mask)
	35	{
	36	result->all[0] = a1->all[0] & mask->all[0];
	37	result->all[1] = a1->all[1] & mask->all[1];
	38	result->all[2] = a1->all[2] & mask->all[2];
	39	result->all[3] = a1->all[3] & mask->all[3];
	40	}
	41
a0f4ecf3	42	int netfilter_init(void);
1da177e4	43
1da177e4	44	struct sk_buff;
1da177e4	45
795aa6ef	46	struct nf_hook_ops;
cfdfab31	47
1c984f8a DM	48	struct sock;
1c984f8a DM	49
cfdfab31 DM	50	struct nf_hook_state {
	51	unsigned int hook;
	52	int thresh;
	53	u_int8_t pf;
	54	struct net_device *in;
	55	struct net_device *out;
1c984f8a	56	struct sock *sk;
b11b1f65	57	struct net *net;
f7191483	58	struct list_head *hook_list;
0c4b51f0	59	int (okfn)(struct net , struct sock , struct sk_buff );
cfdfab31 DM	60	};
cfdfab31 DM	61
107a9f4d	62	static inline void nf_hook_state_init(struct nf_hook_state *p,
f7191483	63	struct list_head *hook_list,
107a9f4d DM	64	unsigned int hook,
	65	int thresh, u_int8_t pf,
	66	struct net_device *indev,
	67	struct net_device *outdev,
1c984f8a	68	struct sock *sk,
b11b1f65	69	struct net *net,
0c4b51f0	70	int (okfn)(struct net , struct sock , struct sk_buff ))
107a9f4d DM	71	{
	72	p->hook = hook;
	73	p->thresh = thresh;
	74	p->pf = pf;
	75	p->in = indev;
	76	p->out = outdev;
1c984f8a	77	p->sk = sk;
b11b1f65	78	p->net = net;
f7191483	79	p->hook_list = hook_list;
107a9f4d DM	80	p->okfn = okfn;
	81	}
	82
06198b34	83	typedef unsigned int nf_hookfn(void *priv,
3db05fea	84	struct sk_buff *skb,
238e54c9	85	const struct nf_hook_state *state);
1da177e4	86
d94d9fee	87	struct nf_hook_ops {
87d5c18c	88	struct list_head list;
1da177e4 LT	89
1da177e4 LT	90	/* User fills in from here down. */
87d5c18c	91	nf_hookfn *hook;
e687ad60	92	struct net_device *dev;
87d5c18c PN	93	struct module *owner;
	94	void *priv;
	95	u_int8_t pf;
	96	unsigned int hooknum;
1da177e4	97	/* Hooks are ordered in ascending priority. */
87d5c18c	98	int priority;
1da177e4 LT	99	};
1da177e4 LT	100
d94d9fee	101	struct nf_sockopt_ops {
1da177e4 LT	102	struct list_head list;
1da177e4 LT	103
76108cea	104	u_int8_t pf;
1da177e4 LT	105
	106	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	107	int set_optmin;
	108	int set_optmax;
	109	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	110	#ifdef CONFIG_COMPAT
3fdadf7d DM	111	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	112	void __user *user, unsigned int len);
c30f540b	113	#endif
1da177e4 LT	114	int get_optmin;
	115	int get_optmax;
	116	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	117	#ifdef CONFIG_COMPAT
3fdadf7d DM	118	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	119	void __user user, int len);
c30f540b	120	#endif
16fcec35 NH	121	/* Use the module struct to lock set/get code in place */
16fcec35 NH	122	struct module *owner;
1da177e4 LT	123	};
1da177e4 LT	124
1da177e4	125	/* Function to register/unregister hook points. */
085db2c0 EB	126	int nf_register_net_hook(struct net net, const struct nf_hook_ops ops);
	127	void nf_unregister_net_hook(struct net net, const struct nf_hook_ops ops);
	128	int nf_register_net_hooks(struct net net, const struct nf_hook_ops reg,
	129	unsigned int n);
	130	void nf_unregister_net_hooks(struct net net, const struct nf_hook_ops reg,
	131	unsigned int n);
	132
1da177e4 LT	133	int nf_register_hook(struct nf_hook_ops *reg);
1da177e4 LT	134	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	135	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	136	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	137
	138	/* Functions to register get/setsockopt ranges (non-inclusive). You
	139	need to check permissions yourself! */
	140	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	141	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	142
d1c85c2e	143	#ifdef HAVE_JUMP_LABEL
c5905afb	144	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
d1c85c2e	145
3bbd14e0	146	static inline bool nf_hook_list_active(struct list_head *hook_list,
b8d0aad0	147	u_int8_t pf, unsigned int hook)
a2d7ec58 ED	148	{
	149	if (__builtin_constant_p(pf) &&
	150	__builtin_constant_p(hook))
c5905afb	151	return static_key_false(&nf_hooks_needed[pf][hook]);
a2d7ec58	152
3bbd14e0	153	return !list_empty(hook_list);
a2d7ec58 ED	154	}
a2d7ec58 ED	155	#else
3bbd14e0	156	static inline bool nf_hook_list_active(struct list_head *hook_list,
b8d0aad0	157	u_int8_t pf, unsigned int hook)
a2d7ec58	158	{
3bbd14e0	159	return !list_empty(hook_list);
a2d7ec58 ED	160	}
	161	#endif
	162
cfdfab31	163	int nf_hook_slow(struct sk_buff skb, struct nf_hook_state state);
16a6677f PM	164
	165	/**
	166	* nf_hook_thresh - call a netfilter hook
b8d0aad0	167	*
16a6677f PM	168	* Returns 1 if the hook has allowed the packet to pass. The function
	169	* okfn must be invoked by the caller in this case. Any other return
	170	* value indicates the packet has been consumed by the hook.
	171	*/
76108cea	172	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
7a773504	173	struct net *net,
7026b1dd	174	struct sock *sk,
3db05fea	175	struct sk_buff *skb,
16a6677f PM	176	struct net_device *indev,
16a6677f PM	177	struct net_device *outdev,
0c4b51f0	178	int (okfn)(struct net , struct sock , struct sk_buff ),
7026b1dd	179	int thresh)
16a6677f	180	{
3bbd14e0	181	struct list_head *hook_list = &net->nf.hooks[pf][hook];
70aa9966	182
3bbd14e0	183	if (nf_hook_list_active(hook_list, pf, hook)) {
107a9f4d	184	struct nf_hook_state state;
cfdfab31	185
3bbd14e0	186	nf_hook_state_init(&state, hook_list, hook, thresh,
b11b1f65	187	pf, indev, outdev, sk, net, okfn);
cfdfab31 DM	188	return nf_hook_slow(skb, &state);
cfdfab31 DM	189	}
a2d7ec58	190	return 1;
16a6677f PM	191	}
16a6677f PM	192
29a26a56 EB	193	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	194	struct sock sk, struct sk_buff skb,
	195	struct net_device indev, struct net_device outdev,
0c4b51f0	196	int (okfn)(struct net , struct sock , struct sk_buff ))
16a6677f	197	{
7a773504	198	return nf_hook_thresh(pf, hook, net, sk, skb, indev, outdev, okfn, INT_MIN);
16a6677f	199	}
1da177e4 LT	200
	201	/* Activate hook; either okfn or kfree_skb called, unless a hook
	202	returns NF_STOLEN (in which case, it's up to the hook to deal with
	203	the consequences).
	204
	205	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	206	accepted.
	207	*/
	208
	209	/* RR:
	210	> I don't want nf_hook to return anything because people might forget
	211	> about async and trust the return value to mean "packet was ok".
	212
	213	AK:
	214	Just document it clearly, then you can expect some sense from kernel
	215	coders :)
	216	*/
	217
2249065f	218	static inline int
29a26a56	219	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
7026b1dd DM	220	struct sk_buff skb, struct net_device in,
7026b1dd DM	221	struct net_device *out,
0c4b51f0 EB	222	int (okfn)(struct net , struct sock , struct sk_buff ),
0c4b51f0 EB	223	int thresh)
2249065f	224	{
7a773504	225	int ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, thresh);
2249065f	226	if (ret == 1)
0c4b51f0	227	ret = okfn(net, sk, skb);
2249065f JE	228	return ret;
2249065f JE	229	}
48d5cad8	230
2249065f	231	static inline int
29a26a56	232	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
7026b1dd	233	struct sk_buff skb, struct net_device in, struct net_device *out,
0c4b51f0 EB	234	int (okfn)(struct net , struct sock , struct sk_buff ),
0c4b51f0 EB	235	bool cond)
2249065f	236	{
4bac6b18 PM	237	int ret;
	238
	239	if (!cond \|\|
7a773504	240	((ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, INT_MIN)) == 1))
0c4b51f0	241	ret = okfn(net, sk, skb);
2249065f JE	242	return ret;
2249065f JE	243	}
1da177e4	244
2249065f	245	static inline int
29a26a56	246	NF_HOOK(uint8_t pf, unsigned int hook, struct net net, struct sock sk, struct sk_buff *skb,
2249065f	247	struct net_device in, struct net_device out,
0c4b51f0	248	int (okfn)(struct net , struct sock , struct sk_buff ))
2249065f	249	{
29a26a56	250	return NF_HOOK_THRESH(pf, hook, net, sk, skb, in, out, okfn, INT_MIN);
2249065f	251	}
1da177e4 LT	252
1da177e4 LT	253	/* Call setsockopt() */
76108cea	254	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	255	unsigned int len);
76108cea	256	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	257	int *len);
c30f540b	258	#ifdef CONFIG_COMPAT
76108cea	259	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	260	char __user *opt, unsigned int len);
76108cea	261	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	262	char __user opt, int len);
c30f540b	263	#endif
3fdadf7d	264
089af26c HW	265	/* Call this before modifying an existing packet: ensures it is
	266	modifiable and linear to the point you care about (writable_len).
	267	Returns true or false. */
a0f4ecf3	268	int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	269
1841a4c7	270	struct flowi;
02f014d8	271	struct nf_queue_entry;
c01cd429	272
bce8032e PM	273	struct nf_afinfo {
bce8032e PM	274	unsigned short family;
b51655b9	275	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	276	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	277	__sum16 (checksum_partial)(struct sk_buff skb,
	278	unsigned int hook,
	279	unsigned int dataoff,
	280	unsigned int len,
	281	u_int8_t protocol);
31ad3dd6	282	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	283	struct flowi *fl, bool strict);
bce8032e	284	void (saveroute)(const struct sk_buff skb,
02f014d8	285	struct nf_queue_entry *entry);
3db05fea	286	int (reroute)(struct sk_buff skb,
02f014d8	287	const struct nf_queue_entry *entry);
bce8032e	288	int route_key_size;
2cc7d573 HW	289	};
2cc7d573 HW	290
0e60ebe0	291	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	292	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	293	{
	294	return rcu_dereference(nf_afinfo[family]);
	295	}
2cc7d573	296
b51655b9	297	static inline __sum16
422c346f PM	298	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	299	u_int8_t protocol, unsigned short family)
	300	{
1e796fda	301	const struct nf_afinfo *afinfo;
b51655b9	302	__sum16 csum = 0;
422c346f PM	303
	304	rcu_read_lock();
	305	afinfo = nf_get_afinfo(family);
	306	if (afinfo)
	307	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	308	rcu_read_unlock();
	309	return csum;
	310	}
	311
d63a6507 PM	312	static inline __sum16
	313	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	314	unsigned int dataoff, unsigned int len,
	315	u_int8_t protocol, unsigned short family)
	316	{
	317	const struct nf_afinfo *afinfo;
	318	__sum16 csum = 0;
	319
	320	rcu_read_lock();
	321	afinfo = nf_get_afinfo(family);
	322	if (afinfo)
	323	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	324	protocol);
	325	rcu_read_unlock();
	326	return csum;
	327	}
	328
a0f4ecf3 JP	329	int nf_register_afinfo(const struct nf_afinfo *afinfo);
a0f4ecf3 JP	330	void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	331
eb9c7ebe	332	#include <net/flow.h>
c7232c99	333	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
eb9c7ebe PM	334
eb9c7ebe PM	335	static inline void
76108cea	336	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	337	{
051578cc	338	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	339	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	340
c7232c99 PM	341	rcu_read_lock();
	342	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	343	if (decodefn)
	344	decodefn(skb, fl);
	345	rcu_read_unlock();
eb9c7ebe PM	346	#endif
	347	}
	348
1da177e4	349	#else /* !CONFIG_NETFILTER */
0c4b51f0 EB	350	#define NF_HOOK(pf, hook, net, sk, skb, indev, outdev, okfn) (okfn)(net, sk, skb)
0c4b51f0 EB	351	#define NF_HOOK_COND(pf, hook, net, sk, skb, indev, outdev, okfn, cond) (okfn)(net, sk, skb)
29a26a56 EB	352	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	353	struct sock sk, struct sk_buff skb,
	354	struct net_device indev, struct net_device outdev,
0c4b51f0	355	int (okfn)(struct net , struct sock , struct sk_buff ))
f53b61d8	356	{
9c92d348	357	return 1;
f53b61d8	358	}
f53b61d8	359	struct flowi;
eb9c7ebe	360	static inline void
76108cea JE	361	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	362	{
	363	}
1da177e4 LT	364	#endif /CONFIG_NETFILTER/
1da177e4 LT	365
5f79e0f9	366	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
62da9865 DB	367	#include <linux/netfilter/nf_conntrack_zones_common.h>
62da9865 DB	368
312a0c16	369	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
a0f4ecf3	370	void nf_ct_attach(struct sk_buff , const struct sk_buff );
0e60ebe0	371	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
9cb01766 PNA	372
9cb01766 PNA	373	struct nf_conn;
41d73ec0	374	enum ip_conntrack_info;
9cb01766 PNA	375	struct nlattr;
	376
	377	struct nfq_ct_hook {
	378	size_t (build_size)(const struct nf_conn ct);
	379	int (build)(struct sk_buff skb, struct nf_conn *ct);
	380	int (parse)(const struct nlattr attr, struct nf_conn *ct);
bd077937 PNA	381	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
bd077937 PNA	382	u32 portid, u32 report);
8c88f87c	383	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
41d73ec0	384	enum ip_conntrack_info ctinfo, s32 off);
9cb01766	385	};
41d73ec0	386	extern struct nfq_ct_hook __rcu *nfq_ct_hook;
5f79e0f9 YK	387	#else
	388	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	389	#endif
	390
e7c8899f FW	391	/**
	392	* nf_skb_duplicated - TEE target has sent a packet
	393	*
	394	* When a xtables target sends a packet, the OUTPUT and POSTROUTING
	395	* hooks are traversed again, i.e. nft and xtables are invoked recursively.
	396	*
	397	* This is used by xtables TEE target to prevent the duplicated skb from
	398	* being duplicated again.
	399	*/
	400	DECLARE_PER_CPU(bool, nf_skb_duplicated);
	401
1da177e4	402	#endif /__LINUX_NETFILTER_H/