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

/* SPDX-License-Identifier: GPL-2.0 */
#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;
	u_int8_t pf;
	struct net_device *in;
	struct net_device *out;
	struct sock *sk;
	struct net *net;
	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 {
	/* 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 {
	nf_hookfn			*hook;
	void				*priv;
};

struct nf_hook_entries {
	u16				num_hook_entries;
	/* padding */
	struct nf_hook_entry		hooks[];

	/* trailer: pointers to original orig_ops of each hook.
	 *
	 * This is not part of struct nf_hook_entry since its only
	 * needed in slow path (hook register/unregister).
	 *
	 * const struct nf_hook_ops     *orig_ops[]
	 */
};

static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e)
{
	unsigned int n = e->num_hook_entries;
	const void *hook_end;

	hook_end = &e->hooks[n]; /* this is *past* ->hooks[]! */

	return (struct nf_hook_ops **)hook_end;
}

static inline int
nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb,
		     struct nf_hook_state *state)
{
	return entry->hook(entry->priv, skb, state);
}

static inline void nf_hook_state_init(struct nf_hook_state *p,
				      unsigned int hook,
				      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->pf = pf;
	p->in = indev;
	p->out = outdev;
	p->sk = sk;
	p->net = net;
	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);

/* 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,
		 const struct nf_hook_entries *e, unsigned int i);

/**
 *	nf_hook - 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(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 *))
{
	struct nf_hook_entries *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, pf, indev, outdev,
				   sk, net, okfn);

		ret = nf_hook_slow(skb, &state, hook_head, 0);
	}
	rcu_read_unlock();

	return ret;
}

/* 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_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(pf, hook, net, sk, skb, in, out, okfn)) == 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 *))
{
	int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn);
	if (ret == 1)
		ret = okfn(net, sk, skb);
	return ret;
}

/* 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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef __LINUX_NETFILTER_H
	3	#define __LINUX_NETFILTER_H
	4
1da177e4	5	#include <linux/init.h>
1da177e4 LT	6	#include <linux/skbuff.h>
	7	#include <linux/net.h>
	8	#include <linux/if.h>
2e3075a2 JE	9	#include <linux/in.h>
2e3075a2 JE	10	#include <linux/in6.h>
1da177e4 LT	11	#include <linux/wait.h>
1da177e4 LT	12	#include <linux/list.h>
d1c85c2e	13	#include <linux/static_key.h>
a263653e	14	#include <linux/netfilter_defs.h>
085db2c0 EB	15	#include <linux/netdevice.h>
085db2c0 EB	16	#include <net/net_namespace.h>
a263653e	17
1da177e4	18	#ifdef CONFIG_NETFILTER
f615df76 FW	19	static inline int NF_DROP_GETERR(int verdict)
	20	{
	21	return -(verdict >> NF_VERDICT_QBITS);
	22	}
1da177e4	23
b8beedd2 PM	24	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	25	const union nf_inet_addr *a2)
	26	{
	27	return a1->all[0] == a2->all[0] &&
	28	a1->all[1] == a2->all[1] &&
	29	a1->all[2] == a2->all[2] &&
	30	a1->all[3] == a2->all[3];
	31	}
	32
efdedd54 DF	33	static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
	34	union nf_inet_addr *result,
	35	const union nf_inet_addr *mask)
	36	{
	37	result->all[0] = a1->all[0] & mask->all[0];
	38	result->all[1] = a1->all[1] & mask->all[1];
	39	result->all[2] = a1->all[2] & mask->all[2];
	40	result->all[3] = a1->all[3] & mask->all[3];
	41	}
	42
a0f4ecf3	43	int netfilter_init(void);
1da177e4	44
1da177e4	45	struct sk_buff;
1da177e4	46
795aa6ef	47	struct nf_hook_ops;
cfdfab31	48
1c984f8a DM	49	struct sock;
1c984f8a DM	50
cfdfab31 DM	51	struct nf_hook_state {
cfdfab31 DM	52	unsigned int hook;
cfdfab31 DM	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;
0c4b51f0	58	int (okfn)(struct net , struct sock , struct sk_buff );
cfdfab31 DM	59	};
cfdfab31 DM	60
e3b37f11 AC	61	typedef unsigned int nf_hookfn(void *priv,
	62	struct sk_buff *skb,
	63	const struct nf_hook_state *state);
	64	struct nf_hook_ops {
e3b37f11 AC	65	/* User fills in from here down. */
	66	nf_hookfn *hook;
	67	struct net_device *dev;
	68	void *priv;
	69	u_int8_t pf;
	70	unsigned int hooknum;
	71	/* Hooks are ordered in ascending priority. */
	72	int priority;
	73	};
	74
	75	struct nf_hook_entry {
d415b9eb AC	76	nf_hookfn *hook;
d415b9eb AC	77	void *priv;
e3b37f11 AC	78	};
e3b37f11 AC	79
960632ec AC	80	struct nf_hook_entries {
	81	u16 num_hook_entries;
	82	/* padding */
	83	struct nf_hook_entry hooks[];
	84
	85	/* trailer: pointers to original orig_ops of each hook.
	86	*
	87	* This is not part of struct nf_hook_entry since its only
	88	* needed in slow path (hook register/unregister).
	89	*
	90	* const struct nf_hook_ops *orig_ops[]
	91	*/
	92	};
0aa8c57a	93
960632ec	94	static inline struct nf_hook_ops *nf_hook_entries_get_hook_ops(const struct nf_hook_entries e)
0aa8c57a	95	{
960632ec AC	96	unsigned int n = e->num_hook_entries;
	97	const void *hook_end;
	98
	99	hook_end = &e->hooks[n]; /* this is past ->hooks[]! */
	100
	101	return (struct nf_hook_ops **)hook_end;
0aa8c57a AC	102	}
	103
	104	static inline int
	105	nf_hook_entry_hookfn(const struct nf_hook_entry entry, struct sk_buff skb,
	106	struct nf_hook_state *state)
	107	{
d415b9eb	108	return entry->hook(entry->priv, skb, state);
0aa8c57a AC	109	}
0aa8c57a AC	110
107a9f4d DM	111	static inline void nf_hook_state_init(struct nf_hook_state *p,
107a9f4d DM	112	unsigned int hook,
1610a73c	113	u_int8_t pf,
107a9f4d DM	114	struct net_device *indev,
107a9f4d DM	115	struct net_device *outdev,
1c984f8a	116	struct sock *sk,
b11b1f65	117	struct net *net,
0c4b51f0	118	int (okfn)(struct net , struct sock , struct sk_buff ))
107a9f4d DM	119	{
107a9f4d DM	120	p->hook = hook;
107a9f4d DM	121	p->pf = pf;
	122	p->in = indev;
	123	p->out = outdev;
1c984f8a	124	p->sk = sk;
b11b1f65	125	p->net = net;
107a9f4d DM	126	p->okfn = okfn;
	127	}
	128
1da177e4	129
1da177e4	130
d94d9fee	131	struct nf_sockopt_ops {
1da177e4 LT	132	struct list_head list;
1da177e4 LT	133
76108cea	134	u_int8_t pf;
1da177e4 LT	135
	136	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	137	int set_optmin;
	138	int set_optmax;
	139	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	140	#ifdef CONFIG_COMPAT
3fdadf7d DM	141	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	142	void __user *user, unsigned int len);
c30f540b	143	#endif
1da177e4 LT	144	int get_optmin;
	145	int get_optmax;
	146	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	147	#ifdef CONFIG_COMPAT
3fdadf7d DM	148	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	149	void __user user, int len);
c30f540b	150	#endif
16fcec35 NH	151	/* Use the module struct to lock set/get code in place */
16fcec35 NH	152	struct module *owner;
1da177e4 LT	153	};
1da177e4 LT	154
1da177e4	155	/* Function to register/unregister hook points. */
085db2c0 EB	156	int nf_register_net_hook(struct net net, const struct nf_hook_ops ops);
	157	void nf_unregister_net_hook(struct net net, const struct nf_hook_ops ops);
	158	int nf_register_net_hooks(struct net net, const struct nf_hook_ops reg,
	159	unsigned int n);
	160	void nf_unregister_net_hooks(struct net net, const struct nf_hook_ops reg,
	161	unsigned int n);
	162
1da177e4 LT	163	/* Functions to register get/setsockopt ranges (non-inclusive). You
	164	need to check permissions yourself! */
	165	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	166	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	167
d1c85c2e	168	#ifdef HAVE_JUMP_LABEL
c5905afb	169	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
a2d7ec58 ED	170	#endif
a2d7ec58 ED	171
01886bd9	172	int nf_hook_slow(struct sk_buff skb, struct nf_hook_state state,
960632ec	173	const struct nf_hook_entries *e, unsigned int i);
16a6677f PM	174
16a6677f PM	175	/**
1610a73c	176	* nf_hook - call a netfilter hook
b8d0aad0	177	*
16a6677f PM	178	* Returns 1 if the hook has allowed the packet to pass. The function
	179	* okfn must be invoked by the caller in this case. Any other return
	180	* value indicates the packet has been consumed by the hook.
	181	*/
1610a73c PNA	182	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	183	struct sock sk, struct sk_buff skb,
	184	struct net_device indev, struct net_device outdev,
	185	int (okfn)(struct net , struct sock , struct sk_buff ))
16a6677f	186	{
960632ec	187	struct nf_hook_entries *hook_head;
e3b37f11	188	int ret = 1;
af4610c3 FW	189
	190	#ifdef HAVE_JUMP_LABEL
	191	if (__builtin_constant_p(pf) &&
	192	__builtin_constant_p(hook) &&
	193	!static_key_false(&nf_hooks_needed[pf][hook]))
	194	return 1;
	195	#endif
	196
e3b37f11 AC	197	rcu_read_lock();
	198	hook_head = rcu_dereference(net->nf.hooks[pf][hook]);
	199	if (hook_head) {
107a9f4d	200	struct nf_hook_state state;
cfdfab31	201
01886bd9	202	nf_hook_state_init(&state, hook, pf, indev, outdev,
1610a73c	203	sk, net, okfn);
fe72926b	204
960632ec	205	ret = nf_hook_slow(skb, &state, hook_head, 0);
cfdfab31	206	}
e3b37f11 AC	207	rcu_read_unlock();
	208
	209	return ret;
16a6677f PM	210	}
16a6677f PM	211
1da177e4 LT	212	/* Activate hook; either okfn or kfree_skb called, unless a hook
	213	returns NF_STOLEN (in which case, it's up to the hook to deal with
	214	the consequences).
	215
	216	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	217	accepted.
	218	*/
	219
	220	/* RR:
	221	> I don't want nf_hook to return anything because people might forget
	222	> about async and trust the return value to mean "packet was ok".
	223
	224	AK:
	225	Just document it clearly, then you can expect some sense from kernel
	226	coders :)
	227	*/
	228
2249065f	229	static inline int
29a26a56	230	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
7026b1dd	231	struct sk_buff skb, struct net_device in, struct net_device *out,
0c4b51f0 EB	232	int (okfn)(struct net , struct sock , struct sk_buff ),
0c4b51f0 EB	233	bool cond)
2249065f	234	{
4bac6b18 PM	235	int ret;
	236
	237	if (!cond \|\|
1610a73c	238	((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1))
0c4b51f0	239	ret = okfn(net, sk, skb);
2249065f JE	240	return ret;
2249065f JE	241	}
1da177e4	242
2249065f	243	static inline int
29a26a56	244	NF_HOOK(uint8_t pf, unsigned int hook, struct net net, struct sock sk, struct sk_buff *skb,
2249065f	245	struct net_device in, struct net_device out,
0c4b51f0	246	int (okfn)(struct net , struct sock , struct sk_buff ))
2249065f	247	{
1610a73c PNA	248	int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn);
	249	if (ret == 1)
	250	ret = okfn(net, sk, skb);
	251	return ret;
2249065f	252	}
1da177e4 LT	253
1da177e4 LT	254	/* Call setsockopt() */
76108cea	255	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	256	unsigned int len);
76108cea	257	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	258	int *len);
c30f540b	259	#ifdef CONFIG_COMPAT
76108cea	260	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	261	char __user *opt, unsigned int len);
76108cea	262	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	263	char __user opt, int len);
c30f540b	264	#endif
3fdadf7d	265
089af26c HW	266	/* Call this before modifying an existing packet: ensures it is
	267	modifiable and linear to the point you care about (writable_len).
	268	Returns true or false. */
a0f4ecf3	269	int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	270
1841a4c7	271	struct flowi;
02f014d8	272	struct nf_queue_entry;
c01cd429	273
bce8032e PM	274	struct nf_afinfo {
bce8032e PM	275	unsigned short family;
b51655b9	276	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	277	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	278	__sum16 (checksum_partial)(struct sk_buff skb,
	279	unsigned int hook,
	280	unsigned int dataoff,
	281	unsigned int len,
	282	u_int8_t protocol);
31ad3dd6	283	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	284	struct flowi *fl, bool strict);
bce8032e	285	void (saveroute)(const struct sk_buff skb,
02f014d8	286	struct nf_queue_entry *entry);
d815d90b	287	int (reroute)(struct net net, struct sk_buff *skb,
02f014d8	288	const struct nf_queue_entry *entry);
bce8032e	289	int route_key_size;
2cc7d573 HW	290	};
2cc7d573 HW	291
0e60ebe0	292	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	293	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	294	{
	295	return rcu_dereference(nf_afinfo[family]);
	296	}
2cc7d573	297
b51655b9	298	static inline __sum16
422c346f PM	299	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	300	u_int8_t protocol, unsigned short family)
	301	{
1e796fda	302	const struct nf_afinfo *afinfo;
b51655b9	303	__sum16 csum = 0;
422c346f PM	304
	305	rcu_read_lock();
	306	afinfo = nf_get_afinfo(family);
	307	if (afinfo)
	308	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	309	rcu_read_unlock();
	310	return csum;
	311	}
	312
d63a6507 PM	313	static inline __sum16
	314	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	315	unsigned int dataoff, unsigned int len,
	316	u_int8_t protocol, unsigned short family)
	317	{
	318	const struct nf_afinfo *afinfo;
	319	__sum16 csum = 0;
	320
	321	rcu_read_lock();
	322	afinfo = nf_get_afinfo(family);
	323	if (afinfo)
	324	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	325	protocol);
	326	rcu_read_unlock();
	327	return csum;
	328	}
	329
a0f4ecf3 JP	330	int nf_register_afinfo(const struct nf_afinfo *afinfo);
a0f4ecf3 JP	331	void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	332
eb9c7ebe	333	#include <net/flow.h>
c7232c99	334	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
eb9c7ebe PM	335
eb9c7ebe PM	336	static inline void
76108cea	337	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	338	{
051578cc	339	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	340	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	341
c7232c99 PM	342	rcu_read_lock();
	343	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	344	if (decodefn)
	345	decodefn(skb, fl);
	346	rcu_read_unlock();
eb9c7ebe PM	347	#endif
	348	}
	349
1da177e4	350	#else /* !CONFIG_NETFILTER */
008027c3 AB	351	static inline int
	352	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	353	struct sk_buff skb, struct net_device in, struct net_device *out,
	354	int (okfn)(struct net , struct sock , struct sk_buff ),
	355	bool cond)
	356	{
	357	return okfn(net, sk, skb);
	358	}
	359
	360	static inline int
	361	NF_HOOK(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	362	struct sk_buff skb, struct net_device in, struct net_device *out,
	363	int (okfn)(struct net , struct sock , struct sk_buff ))
	364	{
	365	return okfn(net, sk, skb);
	366	}
	367
29a26a56 EB	368	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	369	struct sock sk, struct sk_buff skb,
	370	struct net_device indev, struct net_device outdev,
0c4b51f0	371	int (okfn)(struct net , struct sock , struct sk_buff ))
f53b61d8	372	{
9c92d348	373	return 1;
f53b61d8	374	}
f53b61d8	375	struct flowi;
eb9c7ebe	376	static inline void
76108cea JE	377	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	378	{
	379	}
1da177e4 LT	380	#endif /CONFIG_NETFILTER/
1da177e4 LT	381
5f79e0f9	382	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
62da9865 DB	383	#include <linux/netfilter/nf_conntrack_zones_common.h>
62da9865 DB	384
312a0c16	385	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
a0f4ecf3	386	void nf_ct_attach(struct sk_buff , const struct sk_buff );
0e60ebe0	387	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
b7bd1809 PNA	388	#else
	389	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	390	#endif
9cb01766 PNA	391
9cb01766 PNA	392	struct nf_conn;
41d73ec0	393	enum ip_conntrack_info;
9cb01766 PNA	394	struct nlattr;
9cb01766 PNA	395
a4b4766c	396	struct nfnl_ct_hook {
224a0597	397	struct nf_conn (get_ct)(const struct sk_buff *skb,
b7bd1809	398	enum ip_conntrack_info *ctinfo);
9cb01766	399	size_t (build_size)(const struct nf_conn ct);
b7bd1809 PNA	400	int (build)(struct sk_buff skb, struct nf_conn *ct,
	401	enum ip_conntrack_info ctinfo,
	402	u_int16_t ct_attr, u_int16_t ct_info_attr);
9cb01766	403	int (parse)(const struct nlattr attr, struct nf_conn *ct);
bd077937 PNA	404	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
bd077937 PNA	405	u32 portid, u32 report);
8c88f87c	406	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
41d73ec0	407	enum ip_conntrack_info ctinfo, s32 off);
9cb01766	408	};
a4b4766c	409	extern struct nfnl_ct_hook __rcu *nfnl_ct_hook;
5f79e0f9	410
e7c8899f FW	411	/**
	412	* nf_skb_duplicated - TEE target has sent a packet
	413	*
	414	* When a xtables target sends a packet, the OUTPUT and POSTROUTING
	415	* hooks are traversed again, i.e. nft and xtables are invoked recursively.
	416	*
	417	* This is used by xtables TEE target to prevent the duplicated skb from
	418	* being duplicated again.
	419	*/
	420	DECLARE_PER_CPU(bool, nf_skb_duplicated);
	421
1da177e4	422	#endif /__LINUX_NETFILTER_H/