[linux-block.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 nf_hook_entry __rcu *hook_entries;
	int (*okfn)(struct net *, struct sock *, struct sk_buff *);
};

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;
	void			*priv;
	u_int8_t		pf;
	unsigned int		hooknum;
	/* Hooks are ordered in ascending priority. */
	int			priority;
};

struct nf_hook_entry {
	struct nf_hook_entry __rcu	*next;
	struct nf_hook_ops		ops;
	const struct nf_hook_ops	*orig_ops;
};

static inline void nf_hook_state_init(struct nf_hook_state *p,
				      struct nf_hook_entry *hook_entry,
				      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;
	RCU_INIT_POINTER(p->hook_entries, hook_entry);
	p->okfn = okfn;
}


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);
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];
#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 nf_hook_entry *hook_head;
	int ret = 1;

#ifdef HAVE_JUMP_LABEL
	if (__builtin_constant_p(pf) &&
	    __builtin_constant_p(hook) &&
	    !static_key_false(&nf_hooks_needed[pf][hook]))
		return 1;
#endif

	rcu_read_lock();
	hook_head = rcu_dereference(net->nf.hooks[pf][hook]);
	if (hook_head) {
		struct nf_hook_state state;

		nf_hook_state_init(&state, hook_head, hook, thresh,
				   pf, indev, outdev, sk, net, okfn);

		ret = nf_hook_slow(skb, &state);
	}
	rcu_read_unlock();

	return ret;
}

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 net *net, 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 */
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)
{
	return okfn(net, sk, skb);
}

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 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;
#else
static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
#endif

struct nf_conn;
enum ip_conntrack_info;
struct nlattr;

struct nfnl_ct_hook {
	struct nf_conn *(*get_ct)(const struct sk_buff *skb,
				  enum ip_conntrack_info *ctinfo);
	size_t (*build_size)(const struct nf_conn *ct);
	int (*build)(struct sk_buff *skb, struct nf_conn *ct,
		     enum ip_conntrack_info ctinfo,
		     u_int16_t ct_attr, u_int16_t ct_info_attr);
	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 nfnl_ct_hook __rcu *nfnl_ct_hook;

/**
 * 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;
e3b37f11	58	struct nf_hook_entry __rcu *hook_entries;
0c4b51f0	59	int (okfn)(struct net , struct sock , struct sk_buff );
cfdfab31 DM	60	};
cfdfab31 DM	61
e3b37f11 AC	62	typedef unsigned int nf_hookfn(void *priv,
	63	struct sk_buff *skb,
	64	const struct nf_hook_state *state);
	65	struct nf_hook_ops {
	66	struct list_head list;
	67
	68	/* User fills in from here down. */
	69	nf_hookfn *hook;
	70	struct net_device *dev;
	71	void *priv;
	72	u_int8_t pf;
	73	unsigned int hooknum;
	74	/* Hooks are ordered in ascending priority. */
	75	int priority;
	76	};
	77
	78	struct nf_hook_entry {
	79	struct nf_hook_entry __rcu *next;
	80	struct nf_hook_ops ops;
	81	const struct nf_hook_ops *orig_ops;
	82	};
	83
107a9f4d	84	static inline void nf_hook_state_init(struct nf_hook_state *p,
e3b37f11	85	struct nf_hook_entry *hook_entry,
107a9f4d DM	86	unsigned int hook,
	87	int thresh, u_int8_t pf,
	88	struct net_device *indev,
	89	struct net_device *outdev,
1c984f8a	90	struct sock *sk,
b11b1f65	91	struct net *net,
0c4b51f0	92	int (okfn)(struct net , struct sock , struct sk_buff ))
107a9f4d DM	93	{
	94	p->hook = hook;
	95	p->thresh = thresh;
	96	p->pf = pf;
	97	p->in = indev;
	98	p->out = outdev;
1c984f8a	99	p->sk = sk;
b11b1f65	100	p->net = net;
e3b37f11	101	RCU_INIT_POINTER(p->hook_entries, hook_entry);
107a9f4d DM	102	p->okfn = okfn;
	103	}
	104
1da177e4	105
1da177e4	106
d94d9fee	107	struct nf_sockopt_ops {
1da177e4 LT	108	struct list_head list;
1da177e4 LT	109
76108cea	110	u_int8_t pf;
1da177e4 LT	111
	112	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	113	int set_optmin;
	114	int set_optmax;
	115	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	116	#ifdef CONFIG_COMPAT
3fdadf7d DM	117	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	118	void __user *user, unsigned int len);
c30f540b	119	#endif
1da177e4 LT	120	int get_optmin;
	121	int get_optmax;
	122	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	123	#ifdef CONFIG_COMPAT
3fdadf7d DM	124	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	125	void __user user, int len);
c30f540b	126	#endif
16fcec35 NH	127	/* Use the module struct to lock set/get code in place */
16fcec35 NH	128	struct module *owner;
1da177e4 LT	129	};
1da177e4 LT	130
1da177e4	131	/* Function to register/unregister hook points. */
085db2c0 EB	132	int nf_register_net_hook(struct net net, const struct nf_hook_ops ops);
	133	void nf_unregister_net_hook(struct net net, const struct nf_hook_ops ops);
	134	int nf_register_net_hooks(struct net net, const struct nf_hook_ops reg,
	135	unsigned int n);
	136	void nf_unregister_net_hooks(struct net net, const struct nf_hook_ops reg,
	137	unsigned int n);
	138
1da177e4 LT	139	int nf_register_hook(struct nf_hook_ops *reg);
1da177e4 LT	140	void nf_unregister_hook(struct nf_hook_ops *reg);
972d1cb1 PM	141	int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
972d1cb1 PM	142	void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
e8bffe0c MB	143	int _nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
e8bffe0c MB	144	void _nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
1da177e4 LT	145
	146	/* Functions to register get/setsockopt ranges (non-inclusive). You
	147	need to check permissions yourself! */
	148	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	149	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	150
d1c85c2e	151	#ifdef HAVE_JUMP_LABEL
c5905afb	152	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
a2d7ec58 ED	153	#endif
a2d7ec58 ED	154
cfdfab31	155	int nf_hook_slow(struct sk_buff skb, struct nf_hook_state state);
16a6677f PM	156
	157	/**
	158	* nf_hook_thresh - call a netfilter hook
b8d0aad0	159	*
16a6677f PM	160	* Returns 1 if the hook has allowed the packet to pass. The function
	161	* okfn must be invoked by the caller in this case. Any other return
	162	* value indicates the packet has been consumed by the hook.
	163	*/
76108cea	164	static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
7a773504	165	struct net *net,
7026b1dd	166	struct sock *sk,
3db05fea	167	struct sk_buff *skb,
16a6677f PM	168	struct net_device *indev,
16a6677f PM	169	struct net_device *outdev,
0c4b51f0	170	int (okfn)(struct net , struct sock , struct sk_buff ),
7026b1dd	171	int thresh)
16a6677f	172	{
e3b37f11 AC	173	struct nf_hook_entry *hook_head;
e3b37f11 AC	174	int ret = 1;
af4610c3 FW	175
	176	#ifdef HAVE_JUMP_LABEL
	177	if (__builtin_constant_p(pf) &&
	178	__builtin_constant_p(hook) &&
	179	!static_key_false(&nf_hooks_needed[pf][hook]))
	180	return 1;
	181	#endif
	182
e3b37f11 AC	183	rcu_read_lock();
	184	hook_head = rcu_dereference(net->nf.hooks[pf][hook]);
	185	if (hook_head) {
107a9f4d	186	struct nf_hook_state state;
cfdfab31	187
e3b37f11	188	nf_hook_state_init(&state, hook_head, hook, thresh,
b11b1f65	189	pf, indev, outdev, sk, net, okfn);
fe72926b FW	190
fe72926b FW	191	ret = nf_hook_slow(skb, &state);
cfdfab31	192	}
e3b37f11 AC	193	rcu_read_unlock();
	194
	195	return ret;
16a6677f PM	196	}
16a6677f PM	197
29a26a56 EB	198	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	199	struct sock sk, struct sk_buff skb,
	200	struct net_device indev, struct net_device outdev,
0c4b51f0	201	int (okfn)(struct net , struct sock , struct sk_buff ))
16a6677f	202	{
7a773504	203	return nf_hook_thresh(pf, hook, net, sk, skb, indev, outdev, okfn, INT_MIN);
16a6677f	204	}
1da177e4 LT	205
	206	/* Activate hook; either okfn or kfree_skb called, unless a hook
	207	returns NF_STOLEN (in which case, it's up to the hook to deal with
	208	the consequences).
	209
	210	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	211	accepted.
	212	*/
	213
	214	/* RR:
	215	> I don't want nf_hook to return anything because people might forget
	216	> about async and trust the return value to mean "packet was ok".
	217
	218	AK:
	219	Just document it clearly, then you can expect some sense from kernel
	220	coders :)
	221	*/
	222
2249065f	223	static inline int
29a26a56	224	NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
7026b1dd DM	225	struct sk_buff skb, struct net_device in,
7026b1dd DM	226	struct net_device *out,
0c4b51f0 EB	227	int (okfn)(struct net , struct sock , struct sk_buff ),
0c4b51f0 EB	228	int thresh)
2249065f	229	{
7a773504	230	int ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, thresh);
2249065f	231	if (ret == 1)
0c4b51f0	232	ret = okfn(net, sk, skb);
2249065f JE	233	return ret;
2249065f JE	234	}
48d5cad8	235
2249065f	236	static inline int
29a26a56	237	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
7026b1dd	238	struct sk_buff skb, struct net_device in, struct net_device *out,
0c4b51f0 EB	239	int (okfn)(struct net , struct sock , struct sk_buff ),
0c4b51f0 EB	240	bool cond)
2249065f	241	{
4bac6b18 PM	242	int ret;
	243
	244	if (!cond \|\|
7a773504	245	((ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, INT_MIN)) == 1))
0c4b51f0	246	ret = okfn(net, sk, skb);
2249065f JE	247	return ret;
2249065f JE	248	}
1da177e4	249
2249065f	250	static inline int
29a26a56	251	NF_HOOK(uint8_t pf, unsigned int hook, struct net net, struct sock sk, struct sk_buff *skb,
2249065f	252	struct net_device in, struct net_device out,
0c4b51f0	253	int (okfn)(struct net , struct sock , struct sk_buff ))
2249065f	254	{
29a26a56	255	return NF_HOOK_THRESH(pf, hook, net, sk, skb, in, out, okfn, INT_MIN);
2249065f	256	}
1da177e4 LT	257
1da177e4 LT	258	/* Call setsockopt() */
76108cea	259	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	260	unsigned int len);
76108cea	261	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	262	int *len);
c30f540b	263	#ifdef CONFIG_COMPAT
76108cea	264	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	265	char __user *opt, unsigned int len);
76108cea	266	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	267	char __user opt, int len);
c30f540b	268	#endif
3fdadf7d	269
089af26c HW	270	/* Call this before modifying an existing packet: ensures it is
	271	modifiable and linear to the point you care about (writable_len).
	272	Returns true or false. */
a0f4ecf3	273	int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	274
1841a4c7	275	struct flowi;
02f014d8	276	struct nf_queue_entry;
c01cd429	277
bce8032e PM	278	struct nf_afinfo {
bce8032e PM	279	unsigned short family;
b51655b9	280	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	281	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	282	__sum16 (checksum_partial)(struct sk_buff skb,
	283	unsigned int hook,
	284	unsigned int dataoff,
	285	unsigned int len,
	286	u_int8_t protocol);
31ad3dd6	287	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	288	struct flowi *fl, bool strict);
bce8032e	289	void (saveroute)(const struct sk_buff skb,
02f014d8	290	struct nf_queue_entry *entry);
d815d90b	291	int (reroute)(struct net net, struct sk_buff *skb,
02f014d8	292	const struct nf_queue_entry *entry);
bce8032e	293	int route_key_size;
2cc7d573 HW	294	};
2cc7d573 HW	295
0e60ebe0	296	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	297	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	298	{
	299	return rcu_dereference(nf_afinfo[family]);
	300	}
2cc7d573	301
b51655b9	302	static inline __sum16
422c346f PM	303	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	304	u_int8_t protocol, unsigned short family)
	305	{
1e796fda	306	const struct nf_afinfo *afinfo;
b51655b9	307	__sum16 csum = 0;
422c346f PM	308
	309	rcu_read_lock();
	310	afinfo = nf_get_afinfo(family);
	311	if (afinfo)
	312	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	313	rcu_read_unlock();
	314	return csum;
	315	}
	316
d63a6507 PM	317	static inline __sum16
	318	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	319	unsigned int dataoff, unsigned int len,
	320	u_int8_t protocol, unsigned short family)
	321	{
	322	const struct nf_afinfo *afinfo;
	323	__sum16 csum = 0;
	324
	325	rcu_read_lock();
	326	afinfo = nf_get_afinfo(family);
	327	if (afinfo)
	328	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	329	protocol);
	330	rcu_read_unlock();
	331	return csum;
	332	}
	333
a0f4ecf3 JP	334	int nf_register_afinfo(const struct nf_afinfo *afinfo);
a0f4ecf3 JP	335	void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	336
eb9c7ebe	337	#include <net/flow.h>
c7232c99	338	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
eb9c7ebe PM	339
eb9c7ebe PM	340	static inline void
76108cea	341	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	342	{
051578cc	343	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	344	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	345
c7232c99 PM	346	rcu_read_lock();
	347	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	348	if (decodefn)
	349	decodefn(skb, fl);
	350	rcu_read_unlock();
eb9c7ebe PM	351	#endif
	352	}
	353
1da177e4	354	#else /* !CONFIG_NETFILTER */
008027c3 AB	355	static inline int
	356	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	357	struct sk_buff skb, struct net_device in, struct net_device *out,
	358	int (okfn)(struct net , struct sock , struct sk_buff ),
	359	bool cond)
	360	{
	361	return okfn(net, sk, skb);
	362	}
	363
	364	static inline int
	365	NF_HOOK(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	366	struct sk_buff skb, struct net_device in, struct net_device *out,
	367	int (okfn)(struct net , struct sock , struct sk_buff ))
	368	{
	369	return okfn(net, sk, skb);
	370	}
	371
29a26a56 EB	372	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	373	struct sock sk, struct sk_buff skb,
	374	struct net_device indev, struct net_device outdev,
0c4b51f0	375	int (okfn)(struct net , struct sock , struct sk_buff ))
f53b61d8	376	{
9c92d348	377	return 1;
f53b61d8	378	}
f53b61d8	379	struct flowi;
eb9c7ebe	380	static inline void
76108cea JE	381	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	382	{
	383	}
1da177e4 LT	384	#endif /CONFIG_NETFILTER/
1da177e4 LT	385
5f79e0f9	386	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
62da9865 DB	387	#include <linux/netfilter/nf_conntrack_zones_common.h>
62da9865 DB	388
312a0c16	389	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
a0f4ecf3	390	void nf_ct_attach(struct sk_buff , const struct sk_buff );
0e60ebe0	391	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
b7bd1809 PNA	392	#else
	393	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	394	#endif
9cb01766 PNA	395
9cb01766 PNA	396	struct nf_conn;
41d73ec0	397	enum ip_conntrack_info;
9cb01766 PNA	398	struct nlattr;
9cb01766 PNA	399
a4b4766c	400	struct nfnl_ct_hook {
224a0597	401	struct nf_conn (get_ct)(const struct sk_buff *skb,
b7bd1809	402	enum ip_conntrack_info *ctinfo);
9cb01766	403	size_t (build_size)(const struct nf_conn ct);
b7bd1809 PNA	404	int (build)(struct sk_buff skb, struct nf_conn *ct,
	405	enum ip_conntrack_info ctinfo,
	406	u_int16_t ct_attr, u_int16_t ct_info_attr);
9cb01766	407	int (parse)(const struct nlattr attr, struct nf_conn *ct);
bd077937 PNA	408	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
bd077937 PNA	409	u32 portid, u32 report);
8c88f87c	410	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
41d73ec0	411	enum ip_conntrack_info ctinfo, s32 off);
9cb01766	412	};
a4b4766c	413	extern struct nfnl_ct_hook __rcu *nfnl_ct_hook;
5f79e0f9	414
e7c8899f FW	415	/**
	416	* nf_skb_duplicated - TEE target has sent a packet
	417	*
	418	* When a xtables target sends a packet, the OUTPUT and POSTROUTING
	419	* hooks are traversed again, i.e. nft and xtables are invoked recursively.
	420	*
	421	* This is used by xtables TEE target to prevent the duplicated skb from
	422	* being duplicated again.
	423	*/
	424	DECLARE_PER_CPU(bool, nf_skb_duplicated);
	425
1da177e4	426	#endif /__LINUX_NETFILTER_H/