Release 4.14 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);
}

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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];
}

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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];
}

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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;
}

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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);
}

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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;
}



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33.33%
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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;
}

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33
19.30%
1
5.26%
Eric W. Biedermann
24
14.04%
5
26.32%
Aaron Conole
18
10.53%
2
10.53%
Linus Torvalds
12
7.02%
1
5.26%
Pablo Neira Ayuso
3
1.75%
2
10.53%
Herbert Xu
1
0.58%
1
5.26%
Jan Engelhardt
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0.58%
1
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19
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/* 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;
}

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11.11%
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13.64%
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22.22%
David S. Miller
13
11.82%
1
11.11%
Eric W. Biedermann
13
11.82%
3
33.33%
Eric Paris
2
1.82%
1
11.11%
Pablo Neira Ayuso
1
0.91%
1
11.11%
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110
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9
100.00%


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;
}

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23.00%
1
14.29%
David S. Miller
11
11.00%
1
14.29%
Eric W. Biedermann
11
11.00%
2
28.57%
Linus Torvalds (pre-git)
10
10.00%
1
14.29%
Patrick McHardy
2
2.00%
1
14.29%
Total
100
100.00%
7
100.00%

/* 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]);
}

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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;
}

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3
100.00%


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;
}

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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
}

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20.00%
Jozsef Kadlecsik
1
1.56%
1
20.00%
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64
100.00%
5
100.00%

#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);
}

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15.49%
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David S. Miller
2
2.82%
1
25.00%
Eric W. Biedermann
2
2.82%
1
25.00%
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71
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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);
}

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2.94%
1
25.00%
David S. Miller
2
2.94%
1
25.00%
Total
68
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4
100.00%



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;
}
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9
14.75%
2
28.57%
Herbert Xu
1
1.64%
1
14.29%
Patrick McHardy
1
1.64%
1
14.29%
Jan Engelhardt
1
1.64%
1
14.29%
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61
100.00%
7
100.00%

struct flowi;

static inline void

nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
{
}
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100.00%

#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) {}
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#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*/
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21.59%
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249
11.20%
6
6.82%
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203
9.13%
5
5.68%
Pablo Neira Ayuso
194
8.72%
11
12.50%
Aaron Conole
190
8.54%
4
4.55%
Eric W. Biedermann
161
7.24%
7
7.95%
Jan Engelhardt
126
5.67%
4
4.55%
Denys Fedoryshchenko
108
4.86%
1
1.14%
Arnd Bergmann
108
4.86%
1
1.14%
Dmitry Mishin
93
4.18%
1
1.14%
Florian Westphal
78
3.51%
6
6.82%
Harald Welte
61
2.74%
2
2.27%
Eric Dumazet
30
1.35%
2
2.27%
Yasuyuki Kozakai
26
1.17%
2
2.27%
Alexey Dobriyan
15
0.67%
1
1.14%
Linus Torvalds
12
0.54%
1
1.14%
Al Viro
7
0.31%
2
2.27%
Zhouyi Zhou
6
0.27%
1
1.14%
Ken-ichirou MATSUZAWA
4
0.18%
2
2.27%
Herbert Xu
4
0.18%
2
2.27%
Neil Horman
3
0.13%
1
1.14%
Daniel Borkmann
3
0.13%
1
1.14%
Bart De Schuymer
2
0.09%
1
1.14%
Eric Paris
2
0.09%
1
1.14%
Hideaki Yoshifuji / 吉藤英明
2
0.09%
1
1.14%
Ingo Molnar
1
0.04%
1
1.14%
Jozsef Kadlecsik
1
0.04%
1
1.14%
Greg Kroah-Hartman
1
0.04%
1
1.14%
Total
2224
100.00%
88
100.00%
Directory: include/linux

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