[mirror_ubuntu-artful-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;
	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 {
	struct nf_hook_entry __rcu	*next;
	nf_hookfn			*hook;
	void				*priv;
	const struct nf_hook_ops	*orig_ops;
};

static inline void
nf_hook_entry_init(struct nf_hook_entry *entry,	const struct nf_hook_ops *ops)
{
	entry->next = NULL;
	entry->hook = ops->hook;
	entry->priv = ops->priv;
	entry->orig_ops = ops;
}

static inline int
nf_hook_entry_priority(const struct nf_hook_entry *entry)
{
	return entry->orig_ops->priority;
}

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 const struct nf_hook_ops *
nf_hook_entry_ops(const struct nf_hook_entry *entry)
{
	return entry->orig_ops;
}

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,
		 struct nf_hook_entry *entry);

/**
 *	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_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, pf, indev, outdev,
				   sk, net, okfn);

		ret = nf_hook_slow(skb, &state, hook_head);
	}
	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
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 {
cfdfab31 DM	51	unsigned int hook;
cfdfab31 DM	52	u_int8_t pf;
	53	struct net_device *in;
	54	struct net_device *out;
1c984f8a	55	struct sock *sk;
b11b1f65	56	struct net *net;
0c4b51f0	57	int (okfn)(struct net , struct sock , struct sk_buff );
cfdfab31 DM	58	};
cfdfab31 DM	59
e3b37f11 AC	60	typedef unsigned int nf_hookfn(void *priv,
	61	struct sk_buff *skb,
	62	const struct nf_hook_state *state);
	63	struct nf_hook_ops {
e3b37f11 AC	64	/* User fills in from here down. */
	65	nf_hookfn *hook;
	66	struct net_device *dev;
	67	void *priv;
	68	u_int8_t pf;
	69	unsigned int hooknum;
	70	/* Hooks are ordered in ascending priority. */
	71	int priority;
	72	};
	73
	74	struct nf_hook_entry {
	75	struct nf_hook_entry __rcu *next;
d415b9eb AC	76	nf_hookfn *hook;
d415b9eb AC	77	void *priv;
e3b37f11 AC	78	const struct nf_hook_ops *orig_ops;
	79	};
	80
0aa8c57a AC	81	static inline void
	82	nf_hook_entry_init(struct nf_hook_entry entry, const struct nf_hook_ops ops)
	83	{
	84	entry->next = NULL;
d415b9eb AC	85	entry->hook = ops->hook;
d415b9eb AC	86	entry->priv = ops->priv;
0aa8c57a AC	87	entry->orig_ops = ops;
	88	}
	89
	90	static inline int
	91	nf_hook_entry_priority(const struct nf_hook_entry *entry)
	92	{
d415b9eb	93	return entry->orig_ops->priority;
0aa8c57a AC	94	}
	95
	96	static inline int
	97	nf_hook_entry_hookfn(const struct nf_hook_entry entry, struct sk_buff skb,
	98	struct nf_hook_state *state)
	99	{
d415b9eb	100	return entry->hook(entry->priv, skb, state);
0aa8c57a AC	101	}
	102
	103	static inline const struct nf_hook_ops *
	104	nf_hook_entry_ops(const struct nf_hook_entry *entry)
	105	{
	106	return entry->orig_ops;
	107	}
	108
107a9f4d DM	109	static inline void nf_hook_state_init(struct nf_hook_state *p,
107a9f4d DM	110	unsigned int hook,
1610a73c	111	u_int8_t pf,
107a9f4d DM	112	struct net_device *indev,
107a9f4d DM	113	struct net_device *outdev,
1c984f8a	114	struct sock *sk,
b11b1f65	115	struct net *net,
0c4b51f0	116	int (okfn)(struct net , struct sock , struct sk_buff ))
107a9f4d DM	117	{
107a9f4d DM	118	p->hook = hook;
107a9f4d DM	119	p->pf = pf;
	120	p->in = indev;
	121	p->out = outdev;
1c984f8a	122	p->sk = sk;
b11b1f65	123	p->net = net;
107a9f4d DM	124	p->okfn = okfn;
	125	}
	126
1da177e4	127
1da177e4	128
d94d9fee	129	struct nf_sockopt_ops {
1da177e4 LT	130	struct list_head list;
1da177e4 LT	131
76108cea	132	u_int8_t pf;
1da177e4 LT	133
	134	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	135	int set_optmin;
	136	int set_optmax;
	137	int (set)(struct sock sk, int optval, void __user *user, unsigned int len);
c30f540b	138	#ifdef CONFIG_COMPAT
3fdadf7d DM	139	int (compat_set)(struct sock sk, int optval,
3fdadf7d DM	140	void __user *user, unsigned int len);
c30f540b	141	#endif
1da177e4 LT	142	int get_optmin;
	143	int get_optmax;
	144	int (get)(struct sock sk, int optval, void __user user, int len);
c30f540b	145	#ifdef CONFIG_COMPAT
3fdadf7d DM	146	int (compat_get)(struct sock sk, int optval,
3fdadf7d DM	147	void __user user, int len);
c30f540b	148	#endif
16fcec35 NH	149	/* Use the module struct to lock set/get code in place */
16fcec35 NH	150	struct module *owner;
1da177e4 LT	151	};
1da177e4 LT	152
1da177e4	153	/* Function to register/unregister hook points. */
085db2c0 EB	154	int nf_register_net_hook(struct net net, const struct nf_hook_ops ops);
	155	void nf_unregister_net_hook(struct net net, const struct nf_hook_ops ops);
	156	int nf_register_net_hooks(struct net net, const struct nf_hook_ops reg,
	157	unsigned int n);
	158	void nf_unregister_net_hooks(struct net net, const struct nf_hook_ops reg,
	159	unsigned int n);
	160
1da177e4 LT	161	/* Functions to register get/setsockopt ranges (non-inclusive). You
	162	need to check permissions yourself! */
	163	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	164	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
	165
d1c85c2e	166	#ifdef HAVE_JUMP_LABEL
c5905afb	167	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
a2d7ec58 ED	168	#endif
a2d7ec58 ED	169
01886bd9 PNA	170	int nf_hook_slow(struct sk_buff skb, struct nf_hook_state state,
01886bd9 PNA	171	struct nf_hook_entry *entry);
16a6677f PM	172
16a6677f PM	173	/**
1610a73c	174	* nf_hook - call a netfilter hook
b8d0aad0	175	*
16a6677f PM	176	* Returns 1 if the hook has allowed the packet to pass. The function
	177	* okfn must be invoked by the caller in this case. Any other return
	178	* value indicates the packet has been consumed by the hook.
	179	*/
1610a73c PNA	180	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	181	struct sock sk, struct sk_buff skb,
	182	struct net_device indev, struct net_device outdev,
	183	int (okfn)(struct net , struct sock , struct sk_buff ))
16a6677f	184	{
e3b37f11 AC	185	struct nf_hook_entry *hook_head;
e3b37f11 AC	186	int ret = 1;
af4610c3 FW	187
	188	#ifdef HAVE_JUMP_LABEL
	189	if (__builtin_constant_p(pf) &&
	190	__builtin_constant_p(hook) &&
	191	!static_key_false(&nf_hooks_needed[pf][hook]))
	192	return 1;
	193	#endif
	194
e3b37f11 AC	195	rcu_read_lock();
	196	hook_head = rcu_dereference(net->nf.hooks[pf][hook]);
	197	if (hook_head) {
107a9f4d	198	struct nf_hook_state state;
cfdfab31	199
01886bd9	200	nf_hook_state_init(&state, hook, pf, indev, outdev,
1610a73c	201	sk, net, okfn);
fe72926b	202
01886bd9	203	ret = nf_hook_slow(skb, &state, hook_head);
cfdfab31	204	}
e3b37f11 AC	205	rcu_read_unlock();
	206
	207	return ret;
16a6677f PM	208	}
16a6677f PM	209
1da177e4 LT	210	/* Activate hook; either okfn or kfree_skb called, unless a hook
	211	returns NF_STOLEN (in which case, it's up to the hook to deal with
	212	the consequences).
	213
	214	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	215	accepted.
	216	*/
	217
	218	/* RR:
	219	> I don't want nf_hook to return anything because people might forget
	220	> about async and trust the return value to mean "packet was ok".
	221
	222	AK:
	223	Just document it clearly, then you can expect some sense from kernel
	224	coders :)
	225	*/
	226
2249065f	227	static inline int
29a26a56	228	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
7026b1dd	229	struct sk_buff skb, struct net_device in, struct net_device *out,
0c4b51f0 EB	230	int (okfn)(struct net , struct sock , struct sk_buff ),
0c4b51f0 EB	231	bool cond)
2249065f	232	{
4bac6b18 PM	233	int ret;
	234
	235	if (!cond \|\|
1610a73c	236	((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1))
0c4b51f0	237	ret = okfn(net, sk, skb);
2249065f JE	238	return ret;
2249065f JE	239	}
1da177e4	240
2249065f	241	static inline int
29a26a56	242	NF_HOOK(uint8_t pf, unsigned int hook, struct net net, struct sock sk, struct sk_buff *skb,
2249065f	243	struct net_device in, struct net_device out,
0c4b51f0	244	int (okfn)(struct net , struct sock , struct sk_buff ))
2249065f	245	{
1610a73c PNA	246	int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn);
	247	if (ret == 1)
	248	ret = okfn(net, sk, skb);
	249	return ret;
2249065f	250	}
1da177e4 LT	251
1da177e4 LT	252	/* Call setsockopt() */
76108cea	253	int nf_setsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
b7058842	254	unsigned int len);
76108cea	255	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
1da177e4	256	int *len);
c30f540b	257	#ifdef CONFIG_COMPAT
76108cea	258	int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
b7058842	259	char __user *opt, unsigned int len);
76108cea	260	int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
3fdadf7d	261	char __user opt, int len);
c30f540b	262	#endif
3fdadf7d	263
089af26c HW	264	/* Call this before modifying an existing packet: ensures it is
	265	modifiable and linear to the point you care about (writable_len).
	266	Returns true or false. */
a0f4ecf3	267	int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
089af26c	268
1841a4c7	269	struct flowi;
02f014d8	270	struct nf_queue_entry;
c01cd429	271
bce8032e PM	272	struct nf_afinfo {
bce8032e PM	273	unsigned short family;
b51655b9	274	__sum16 (checksum)(struct sk_buff skb, unsigned int hook,
422c346f	275	unsigned int dataoff, u_int8_t protocol);
d63a6507 PM	276	__sum16 (checksum_partial)(struct sk_buff skb,
	277	unsigned int hook,
	278	unsigned int dataoff,
	279	unsigned int len,
	280	u_int8_t protocol);
31ad3dd6	281	int (route)(struct net net, struct dst_entry **dst,
0fae2e77	282	struct flowi *fl, bool strict);
bce8032e	283	void (saveroute)(const struct sk_buff skb,
02f014d8	284	struct nf_queue_entry *entry);
d815d90b	285	int (reroute)(struct net net, struct sk_buff *skb,
02f014d8	286	const struct nf_queue_entry *entry);
bce8032e	287	int route_key_size;
2cc7d573 HW	288	};
2cc7d573 HW	289
0e60ebe0	290	extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
1e796fda	291	static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
bce8032e PM	292	{
	293	return rcu_dereference(nf_afinfo[family]);
	294	}
2cc7d573	295
b51655b9	296	static inline __sum16
422c346f PM	297	nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
	298	u_int8_t protocol, unsigned short family)
	299	{
1e796fda	300	const struct nf_afinfo *afinfo;
b51655b9	301	__sum16 csum = 0;
422c346f PM	302
	303	rcu_read_lock();
	304	afinfo = nf_get_afinfo(family);
	305	if (afinfo)
	306	csum = afinfo->checksum(skb, hook, dataoff, protocol);
	307	rcu_read_unlock();
	308	return csum;
	309	}
	310
d63a6507 PM	311	static inline __sum16
	312	nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	313	unsigned int dataoff, unsigned int len,
	314	u_int8_t protocol, unsigned short family)
	315	{
	316	const struct nf_afinfo *afinfo;
	317	__sum16 csum = 0;
	318
	319	rcu_read_lock();
	320	afinfo = nf_get_afinfo(family);
	321	if (afinfo)
	322	csum = afinfo->checksum_partial(skb, hook, dataoff, len,
	323	protocol);
	324	rcu_read_unlock();
	325	return csum;
	326	}
	327
a0f4ecf3 JP	328	int nf_register_afinfo(const struct nf_afinfo *afinfo);
a0f4ecf3 JP	329	void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
bce8032e	330
eb9c7ebe	331	#include <net/flow.h>
c7232c99	332	extern void (nf_nat_decode_session_hook)(struct sk_buff , struct flowi *);
eb9c7ebe PM	333
eb9c7ebe PM	334	static inline void
76108cea	335	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
eb9c7ebe	336	{
051578cc	337	#ifdef CONFIG_NF_NAT_NEEDED
eb9c7ebe PM	338	void (decodefn)(struct sk_buff , struct flowi *);
eb9c7ebe PM	339
c7232c99 PM	340	rcu_read_lock();
	341	decodefn = rcu_dereference(nf_nat_decode_session_hook);
	342	if (decodefn)
	343	decodefn(skb, fl);
	344	rcu_read_unlock();
eb9c7ebe PM	345	#endif
	346	}
	347
1da177e4	348	#else /* !CONFIG_NETFILTER */
008027c3 AB	349	static inline int
	350	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	351	struct sk_buff skb, struct net_device in, struct net_device *out,
	352	int (okfn)(struct net , struct sock , struct sk_buff ),
	353	bool cond)
	354	{
	355	return okfn(net, sk, skb);
	356	}
	357
	358	static inline int
	359	NF_HOOK(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	360	struct sk_buff skb, struct net_device in, struct net_device *out,
	361	int (okfn)(struct net , struct sock , struct sk_buff ))
	362	{
	363	return okfn(net, sk, skb);
	364	}
	365
29a26a56 EB	366	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	367	struct sock sk, struct sk_buff skb,
	368	struct net_device indev, struct net_device outdev,
0c4b51f0	369	int (okfn)(struct net , struct sock , struct sk_buff ))
f53b61d8	370	{
9c92d348	371	return 1;
f53b61d8	372	}
f53b61d8	373	struct flowi;
eb9c7ebe	374	static inline void
76108cea JE	375	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	376	{
	377	}
1da177e4 LT	378	#endif /CONFIG_NETFILTER/
1da177e4 LT	379
5f79e0f9	380	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
62da9865 DB	381	#include <linux/netfilter/nf_conntrack_zones_common.h>
62da9865 DB	382
312a0c16	383	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
a0f4ecf3	384	void nf_ct_attach(struct sk_buff , const struct sk_buff );
0e60ebe0	385	extern void (nf_ct_destroy)(struct nf_conntrack ) __rcu;
b7bd1809 PNA	386	#else
	387	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	388	#endif
9cb01766 PNA	389
9cb01766 PNA	390	struct nf_conn;
41d73ec0	391	enum ip_conntrack_info;
9cb01766 PNA	392	struct nlattr;
9cb01766 PNA	393
a4b4766c	394	struct nfnl_ct_hook {
224a0597	395	struct nf_conn (get_ct)(const struct sk_buff *skb,
b7bd1809	396	enum ip_conntrack_info *ctinfo);
9cb01766	397	size_t (build_size)(const struct nf_conn ct);
b7bd1809 PNA	398	int (build)(struct sk_buff skb, struct nf_conn *ct,
	399	enum ip_conntrack_info ctinfo,
	400	u_int16_t ct_attr, u_int16_t ct_info_attr);
9cb01766	401	int (parse)(const struct nlattr attr, struct nf_conn *ct);
bd077937 PNA	402	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
bd077937 PNA	403	u32 portid, u32 report);
8c88f87c	404	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
41d73ec0	405	enum ip_conntrack_info ctinfo, s32 off);
9cb01766	406	};
a4b4766c	407	extern struct nfnl_ct_hook __rcu *nfnl_ct_hook;
5f79e0f9	408
e7c8899f FW	409	/**
	410	* nf_skb_duplicated - TEE target has sent a packet
	411	*
	412	* When a xtables target sends a packet, the OUTPUT and POSTROUTING
	413	* hooks are traversed again, i.e. nft and xtables are invoked recursively.
	414	*
	415	* This is used by xtables TEE target to prevent the duplicated skb from
	416	* being duplicated again.
	417	*/
	418	DECLARE_PER_CPU(bool, nf_skb_duplicated);
	419
1da177e4	420	#endif /__LINUX_NETFILTER_H/