[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 list_head *hook_list;
	int (*okfn)(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,
				      int (*okfn)(struct sock *, struct sk_buff *))
{
	p->hook = hook;
	p->thresh = thresh;
	p->pf = pf;
	p->in = indev;
	p->out = outdev;
	p->sk = sk;
	p->hook_list = hook_list;
	p->okfn = okfn;
}

typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
			       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 sock *sk,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sock *, struct sk_buff *),
				 int thresh)
{
	struct net *net = dev_net(indev ? indev : outdev);
	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, okfn);
		return nf_hook_slow(skb, &state);
	}
	return 1;
}

static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk,
			  struct sk_buff *skb, struct net_device *indev,
			  struct net_device *outdev,
			  int (*okfn)(struct sock *, struct sk_buff *))
{
	return nf_hook_thresh(pf, hook, 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 sock *sk,
	       struct sk_buff *skb, struct net_device *in,
	       struct net_device *out,
	       int (*okfn)(struct sock *, struct sk_buff *), int thresh)
{
	int ret = nf_hook_thresh(pf, hook, sk, skb, in, out, okfn, thresh);
	if (ret == 1)
		ret = okfn(sk, skb);
	return ret;
}

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

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

static inline int
NF_HOOK(uint8_t pf, unsigned int hook, struct sock *sk, struct sk_buff *skb,
	struct net_device *in, struct net_device *out,
	int (*okfn)(struct sock *, struct sk_buff *))
{
	return NF_HOOK_THRESH(pf, hook, 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, sk, skb, indev, outdev, okfn) (okfn)(sk, skb)
#define NF_HOOK_COND(pf, hook, sk, skb, indev, outdev, okfn, cond) (okfn)(sk, skb)
static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
				 struct sock *sk,
				 struct sk_buff *skb,
				 struct net_device *indev,
				 struct net_device *outdev,
				 int (*okfn)(struct sock *sk, struct sk_buff *), int thresh)
{
	return okfn(sk, skb);
}
static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk,
			  struct sk_buff *skb, struct net_device *indev,
			  struct net_device *outdev,
			  int (*okfn)(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;
f7191483	57	struct list_head *hook_list;
7026b1dd	58	int (okfn)(struct sock , struct sk_buff *);
cfdfab31 DM	59	};
cfdfab31 DM	60
107a9f4d	61	static inline void nf_hook_state_init(struct nf_hook_state *p,
f7191483	62	struct list_head *hook_list,
107a9f4d DM	63	unsigned int hook,
	64	int thresh, u_int8_t pf,
	65	struct net_device *indev,
	66	struct net_device *outdev,
1c984f8a	67	struct sock *sk,
7026b1dd	68	int (okfn)(struct sock , struct sk_buff *))
107a9f4d DM	69	{
	70	p->hook = hook;
	71	p->thresh = thresh;
	72	p->pf = pf;
	73	p->in = indev;
	74	p->out = outdev;
1c984f8a	75	p->sk = sk;
f7191483	76	p->hook_list = hook_list;
107a9f4d DM	77	p->okfn = okfn;
	78	}
	79
795aa6ef	80	typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
3db05fea	81	struct sk_buff *skb,
238e54c9	82	const struct nf_hook_state *state);
1da177e4	83
d94d9fee	84	struct nf_hook_ops {
87d5c18c	85	struct list_head list;
1da177e4 LT	86
1da177e4 LT	87	/* User fills in from here down. */
87d5c18c	88	nf_hookfn *hook;
e687ad60	89	struct net_device *dev;
87d5c18c PN	90	struct module *owner;
	91	void *priv;
	92	u_int8_t pf;
	93	unsigned int hooknum;
1da177e4	94	/* Hooks are ordered in ascending priority. */
87d5c18c	95	int priority;
1da177e4 LT	96	};
1da177e4 LT	97
d94d9fee	98	struct nf_sockopt_ops {
1da177e4 LT	99	struct list_head list;
1da177e4 LT	100
76108cea	101	u_int8_t pf;
1da177e4 LT	102
	103	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	104	int set_optmin;
	105	int set_optmax;
	106	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	107	#ifdef CONFIG_COMPAT
3fdadf7d DM	108	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	109	void __user *user, unsigned int len);
c30f540b	110	#endif
1da177e4 LT	111	int get_optmin;
	112	int get_optmax;
	113	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	114	#ifdef CONFIG_COMPAT
3fdadf7d DM	115	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	116	void __user user, int len);
c30f540b	117	#endif
16fcec35 NH	118	/* Use the module struct to lock set/get code in place */
16fcec35 NH	119	struct module *owner;
1da177e4 LT	120	};
1da177e4 LT	121
1da177e4	122	/* Function to register/unregister hook points. */
085db2c0 EB	123	int nf_register_net_hook(struct net net, const struct nf_hook_ops ops);
	124	void nf_unregister_net_hook(struct net net, const struct nf_hook_ops ops);
	125	int nf_register_net_hooks(struct net net, const struct nf_hook_ops reg,
	126	unsigned int n);
	127	void nf_unregister_net_hooks(struct net net, const struct nf_hook_ops reg,
	128	unsigned int n);
	129
1da177e4 LT	130	int nf_register_hook(struct nf_hook_ops *reg);
1da177e4 LT	131	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	132	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	133	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	134
	135	/* Functions to register get/setsockopt ranges (non-inclusive). You
	136	need to check permissions yourself! */
	137	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	138	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	139
d1c85c2e	140	#ifdef HAVE_JUMP_LABEL
c5905afb	141	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
d1c85c2e	142
3bbd14e0	143	static inline bool nf_hook_list_active(struct list_head *hook_list,
b8d0aad0	144	u_int8_t pf, unsigned int hook)
a2d7ec58 ED	145	{
	146	if (__builtin_constant_p(pf) &&
	147	__builtin_constant_p(hook))
c5905afb	148	return static_key_false(&nf_hooks_needed[pf][hook]);
a2d7ec58	149
3bbd14e0	150	return !list_empty(hook_list);
a2d7ec58 ED	151	}
a2d7ec58 ED	152	#else
3bbd14e0	153	static inline bool nf_hook_list_active(struct list_head *hook_list,
b8d0aad0	154	u_int8_t pf, unsigned int hook)
a2d7ec58	155	{
3bbd14e0	156	return !list_empty(hook_list);
a2d7ec58 ED	157	}
	158	#endif
	159
cfdfab31	160	int nf_hook_slow(struct sk_buff skb, struct nf_hook_state state);
16a6677f PM	161
	162	/**
	163	* nf_hook_thresh - call a netfilter hook
b8d0aad0	164	*
16a6677f PM	165	* Returns 1 if the hook has allowed the packet to pass. The function
	166	* okfn must be invoked by the caller in this case. Any other return
	167	* value indicates the packet has been consumed by the hook.
	168	*/
76108cea	169	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
7026b1dd	170	struct sock *sk,
3db05fea	171	struct sk_buff *skb,
16a6677f PM	172	struct net_device *indev,
16a6677f PM	173	struct net_device *outdev,
7026b1dd DM	174	int (okfn)(struct sock , struct sk_buff *),
7026b1dd DM	175	int thresh)
16a6677f	176	{
085db2c0	177	struct net *net = dev_net(indev ? indev : outdev);
3bbd14e0	178	struct list_head *hook_list = &net->nf.hooks[pf][hook];
70aa9966	179
3bbd14e0	180	if (nf_hook_list_active(hook_list, pf, hook)) {
107a9f4d	181	struct nf_hook_state state;
cfdfab31	182
3bbd14e0	183	nf_hook_state_init(&state, hook_list, hook, thresh,
f7191483	184	pf, indev, outdev, sk, okfn);
cfdfab31 DM	185	return nf_hook_slow(skb, &state);
cfdfab31 DM	186	}
a2d7ec58	187	return 1;
16a6677f PM	188	}
16a6677f PM	189
7026b1dd DM	190	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk,
	191	struct sk_buff skb, struct net_device indev,
	192	struct net_device *outdev,
	193	int (okfn)(struct sock , struct sk_buff *))
16a6677f	194	{
7026b1dd	195	return nf_hook_thresh(pf, hook, sk, skb, indev, outdev, okfn, INT_MIN);
16a6677f	196	}
1da177e4 LT	197
	198	/* Activate hook; either okfn or kfree_skb called, unless a hook
	199	returns NF_STOLEN (in which case, it's up to the hook to deal with
	200	the consequences).
	201
	202	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	203	accepted.
	204	*/
	205
	206	/* RR:
	207	> I don't want nf_hook to return anything because people might forget
	208	> about async and trust the return value to mean "packet was ok".
	209
	210	AK:
	211	Just document it clearly, then you can expect some sense from kernel
	212	coders :)
	213	*/
	214
2249065f	215	static inline int
7026b1dd DM	216	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sock *sk,
	217	struct sk_buff skb, struct net_device in,
	218	struct net_device *out,
	219	int (okfn)(struct sock , struct sk_buff *), int thresh)
2249065f	220	{
7026b1dd	221	int ret = nf_hook_thresh(pf, hook, sk, skb, in, out, okfn, thresh);
2249065f	222	if (ret == 1)
7026b1dd	223	ret = okfn(sk, skb);
2249065f JE	224	return ret;
2249065f JE	225	}
48d5cad8	226
2249065f	227	static inline int
7026b1dd DM	228	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sock *sk,
	229	struct sk_buff skb, struct net_device in, struct net_device *out,
	230	int (okfn)(struct sock , struct sk_buff *), bool cond)
2249065f	231	{
4bac6b18 PM	232	int ret;
	233
	234	if (!cond \|\|
7026b1dd DM	235	((ret = nf_hook_thresh(pf, hook, sk, skb, in, out, okfn, INT_MIN)) == 1))
7026b1dd DM	236	ret = okfn(sk, skb);
2249065f JE	237	return ret;
2249065f JE	238	}
1da177e4	239
2249065f	240	static inline int
7026b1dd	241	NF_HOOK(uint8_t pf, unsigned int hook, struct sock sk, struct sk_buff skb,
2249065f	242	struct net_device in, struct net_device out,
7026b1dd	243	int (okfn)(struct sock , struct sk_buff *))
2249065f	244	{
7026b1dd	245	return NF_HOOK_THRESH(pf, hook, sk, skb, in, out, okfn, INT_MIN);
2249065f	246	}
1da177e4 LT	247
1da177e4 LT	248	/* Call setsockopt() */
76108cea	249	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	250	unsigned int len);
76108cea	251	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	252	int *len);
c30f540b	253	#ifdef CONFIG_COMPAT
76108cea	254	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	255	char __user *opt, unsigned int len);
76108cea	256	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	257	char __user opt, int len);
c30f540b	258	#endif
3fdadf7d	259
089af26c HW	260	/* Call this before modifying an existing packet: ensures it is
	261	modifiable and linear to the point you care about (writable_len).
	262	Returns true or false. */
a0f4ecf3	263	int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	264
1841a4c7	265	struct flowi;
02f014d8	266	struct nf_queue_entry;
c01cd429	267
bce8032e PM	268	struct nf_afinfo {
bce8032e PM	269	unsigned short family;
b51655b9	270	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	271	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	272	__sum16 (checksum_partial)(struct sk_buff skb,
	273	unsigned int hook,
	274	unsigned int dataoff,
	275	unsigned int len,
	276	u_int8_t protocol);
31ad3dd6	277	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	278	struct flowi *fl, bool strict);
bce8032e	279	void (saveroute)(const struct sk_buff skb,
02f014d8	280	struct nf_queue_entry *entry);
3db05fea	281	int (reroute)(struct sk_buff skb,
02f014d8	282	const struct nf_queue_entry *entry);
bce8032e	283	int route_key_size;
2cc7d573 HW	284	};
2cc7d573 HW	285
0e60ebe0	286	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	287	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	288	{
	289	return rcu_dereference(nf_afinfo[family]);
	290	}
2cc7d573	291
b51655b9	292	static inline __sum16
422c346f PM	293	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	294	u_int8_t protocol, unsigned short family)
	295	{
1e796fda	296	const struct nf_afinfo *afinfo;
b51655b9	297	__sum16 csum = 0;
422c346f PM	298
	299	rcu_read_lock();
	300	afinfo = nf_get_afinfo(family);
	301	if (afinfo)
	302	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	303	rcu_read_unlock();
	304	return csum;
	305	}
	306
d63a6507 PM	307	static inline __sum16
	308	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	309	unsigned int dataoff, unsigned int len,
	310	u_int8_t protocol, unsigned short family)
	311	{
	312	const struct nf_afinfo *afinfo;
	313	__sum16 csum = 0;
	314
	315	rcu_read_lock();
	316	afinfo = nf_get_afinfo(family);
	317	if (afinfo)
	318	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	319	protocol);
	320	rcu_read_unlock();
	321	return csum;
	322	}
	323
a0f4ecf3 JP	324	int nf_register_afinfo(const struct nf_afinfo *afinfo);
a0f4ecf3 JP	325	void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	326
eb9c7ebe	327	#include <net/flow.h>
c7232c99	328	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
eb9c7ebe PM	329
eb9c7ebe PM	330	static inline void
76108cea	331	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	332	{
051578cc	333	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	334	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	335
c7232c99 PM	336	rcu_read_lock();
	337	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	338	if (decodefn)
	339	decodefn(skb, fl);
	340	rcu_read_unlock();
eb9c7ebe PM	341	#endif
	342	}
	343
1da177e4	344	#else /* !CONFIG_NETFILTER */
7026b1dd DM	345	#define NF_HOOK(pf, hook, sk, skb, indev, outdev, okfn) (okfn)(sk, skb)
7026b1dd DM	346	#define NF_HOOK_COND(pf, hook, sk, skb, indev, outdev, okfn, cond) (okfn)(sk, skb)
76108cea	347	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
7026b1dd	348	struct sock *sk,
3db05fea	349	struct sk_buff *skb,
f53b61d8 DM	350	struct net_device *indev,
f53b61d8 DM	351	struct net_device *outdev,
7026b1dd	352	int (okfn)(struct sock sk, struct sk_buff *), int thresh)
f53b61d8	353	{
7026b1dd	354	return okfn(sk, skb);
f53b61d8	355	}
7026b1dd DM	356	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk,
	357	struct sk_buff skb, struct net_device indev,
	358	struct net_device *outdev,
	359	int (okfn)(struct sock , struct sk_buff *))
f53b61d8	360	{
9c92d348	361	return 1;
f53b61d8	362	}
f53b61d8	363	struct flowi;
eb9c7ebe	364	static inline void
76108cea JE	365	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	366	{
	367	}
1da177e4 LT	368	#endif /CONFIG_NETFILTER/
1da177e4 LT	369
5f79e0f9	370	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
62da9865 DB	371	#include <linux/netfilter/nf_conntrack_zones_common.h>
62da9865 DB	372
312a0c16	373	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
a0f4ecf3	374	void nf_ct_attach(struct sk_buff , const struct sk_buff );
0e60ebe0	375	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
9cb01766 PNA	376
9cb01766 PNA	377	struct nf_conn;
41d73ec0	378	enum ip_conntrack_info;
9cb01766 PNA	379	struct nlattr;
	380
	381	struct nfq_ct_hook {
	382	size_t (build_size)(const struct nf_conn ct);
	383	int (build)(struct sk_buff skb, struct nf_conn *ct);
	384	int (parse)(const struct nlattr attr, struct nf_conn *ct);
bd077937 PNA	385	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
bd077937 PNA	386	u32 portid, u32 report);
8c88f87c	387	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
41d73ec0	388	enum ip_conntrack_info ctinfo, s32 off);
9cb01766	389	};
41d73ec0	390	extern struct nfq_ct_hook __rcu *nfq_ct_hook;
5f79e0f9 YK	391	#else
	392	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	393	#endif
	394
e7c8899f FW	395	/**
	396	* nf_skb_duplicated - TEE target has sent a packet
	397	*
	398	* When a xtables target sends a packet, the OUTPUT and POSTROUTING
	399	* hooks are traversed again, i.e. nft and xtables are invoked recursively.
	400	*
	401	* This is used by xtables TEE target to prevent the duplicated skb from
	402	* being duplicated again.
	403	*/
	404	DECLARE_PER_CPU(bool, nf_skb_duplicated);
	405
1da177e4	406	#endif /__LINUX_NETFILTER_H/