path: root/include/linux/netfilter/ipset/ip_set.h

/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
 *                         Patrick Schaaf <bof@bof.de>
 *                         Martin Josefsson <gandalf@wlug.westbo.se>
 * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org>
 */
#ifndef _IP_SET_H
#define _IP_SET_H

#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/x_tables.h>
#include <linux/stringify.h>
#include <linux/vmalloc.h>
#include <net/netlink.h>
#include <uapi/linux/netfilter/ipset/ip_set.h>

#define _IP_SET_MODULE_DESC(a, b, c)		\
	MODULE_DESCRIPTION(a " type of IP sets, revisions " b "-" c)
#define IP_SET_MODULE_DESC(a, b, c)		\
	_IP_SET_MODULE_DESC(a, __stringify(b), __stringify(c))

/* Set features */
enum ip_set_feature {
	IPSET_TYPE_IP_FLAG = 0,
	IPSET_TYPE_IP = (1 << IPSET_TYPE_IP_FLAG),
	IPSET_TYPE_PORT_FLAG = 1,
	IPSET_TYPE_PORT = (1 << IPSET_TYPE_PORT_FLAG),
	IPSET_TYPE_MAC_FLAG = 2,
	IPSET_TYPE_MAC = (1 << IPSET_TYPE_MAC_FLAG),
	IPSET_TYPE_IP2_FLAG = 3,
	IPSET_TYPE_IP2 = (1 << IPSET_TYPE_IP2_FLAG),
	IPSET_TYPE_NAME_FLAG = 4,
	IPSET_TYPE_NAME = (1 << IPSET_TYPE_NAME_FLAG),
	IPSET_TYPE_IFACE_FLAG = 5,
	IPSET_TYPE_IFACE = (1 << IPSET_TYPE_IFACE_FLAG),
	IPSET_TYPE_MARK_FLAG = 6,
	IPSET_TYPE_MARK = (1 << IPSET_TYPE_MARK_FLAG),
	IPSET_TYPE_NOMATCH_FLAG = 7,
	IPSET_TYPE_NOMATCH = (1 << IPSET_TYPE_NOMATCH_FLAG),
	/* Strictly speaking not a feature, but a flag for dumping:
	 * this settype must be dumped last */
	IPSET_DUMP_LAST_FLAG = 8,
	IPSET_DUMP_LAST = (1 << IPSET_DUMP_LAST_FLAG),
};

/* Set extensions */
enum ip_set_extension {
	IPSET_EXT_BIT_TIMEOUT = 0,
	IPSET_EXT_TIMEOUT = (1 << IPSET_EXT_BIT_TIMEOUT),
	IPSET_EXT_BIT_COUNTER = 1,
	IPSET_EXT_COUNTER = (1 << IPSET_EXT_BIT_COUNTER),
	IPSET_EXT_BIT_COMMENT = 2,
	IPSET_EXT_COMMENT = (1 << IPSET_EXT_BIT_COMMENT),
	IPSET_EXT_BIT_SKBINFO = 3,
	IPSET_EXT_SKBINFO = (1 << IPSET_EXT_BIT_SKBINFO),
	/* Mark set with an extension which needs to call destroy */
	IPSET_EXT_BIT_DESTROY = 7,
	IPSET_EXT_DESTROY = (1 << IPSET_EXT_BIT_DESTROY),
};

#define SET_WITH_TIMEOUT(s)	((s)->extensions & IPSET_EXT_TIMEOUT)
#define SET_WITH_COUNTER(s)	((s)->extensions & IPSET_EXT_COUNTER)
#define SET_WITH_COMMENT(s)	((s)->extensions & IPSET_EXT_COMMENT)
#define SET_WITH_SKBINFO(s)	((s)->extensions & IPSET_EXT_SKBINFO)
#define SET_WITH_FORCEADD(s)	((s)->flags & IPSET_CREATE_FLAG_FORCEADD)

/* Extension id, in size order */
enum ip_set_ext_id {
	IPSET_EXT_ID_COUNTER = 0,
	IPSET_EXT_ID_TIMEOUT,
	IPSET_EXT_ID_SKBINFO,
	IPSET_EXT_ID_COMMENT,
	IPSET_EXT_ID_MAX,
};

struct ip_set;

/* Extension type */
struct ip_set_ext_type {
	/* Destroy extension private data (can be NULL) */
	void (*destroy)(struct ip_set *set, void *ext);
	enum ip_set_extension type;
	enum ipset_cadt_flags flag;
	/* Size and minimal alignment */
	u8 len;
	u8 align;
};

extern const struct ip_set_ext_type ip_set_extensions[];

struct ip_set_counter {
	atomic64_t bytes;
	atomic64_t packets;
};

struct ip_set_comment_rcu {
	struct rcu_head rcu;
	char str[0];
};

struct ip_set_comment {
	struct ip_set_comment_rcu __rcu *c;
};

struct ip_set_skbinfo {
	u32 skbmark;
	u32 skbmarkmask;
	u32 skbprio;
	u16 skbqueue;
	u16 __pad;
};

struct ip_set_ext {
	struct ip_set_skbinfo skbinfo;
	u64 packets;
	u64 bytes;
	char *comment;
	u32 timeout;
	u8 packets_op;
	u8 bytes_op;
};

struct ip_set;

#define ext_timeout(e, s)	\
((unsigned long *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_TIMEOUT]))
#define ext_counter(e, s)	\
((struct ip_set_counter *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_COUNTER]))
#define ext_comment(e, s)	\
((struct ip_set_comment *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_COMMENT]))
#define ext_skbinfo(e, s)	\
((struct ip_set_skbinfo *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_SKBINFO]))

typedef int (*ipset_adtfn)(struct ip_set *set, void *value,
			   const struct ip_set_ext *ext,
			   struct ip_set_ext *mext, u32 cmdflags);

/* Kernel API function options */
struct ip_set_adt_opt {
	u8 family;		/* Actual protocol family */
	u8 dim;			/* Dimension of match/target */
	u8 flags;		/* Direction and negation flags */
	u32 cmdflags;		/* Command-like flags */
	struct ip_set_ext ext;	/* Extensions */
};

/* Set type, variant-specific part */
struct ip_set_type_variant {
	/* Kernelspace: test/add/del entries
	 *		returns negative error code,
	 *			zero for no match/success to add/delete
	 *			positive for matching element */
	int (*kadt)(struct ip_set *set, const struct sk_buff *skb,
		    const struct xt_action_param *par,
		    enum ipset_adt adt, struct ip_set_adt_opt *opt);

	/* Userspace: test/add/del entries
	 *		returns negative error code,
	 *			zero for no match/success to add/delete
	 *			positive for matching element */
	int (*uadt)(struct ip_set *set, struct nlattr *tb[],
		    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried);

	/* Low level add/del/test functions */
	ipset_adtfn adt[IPSET_ADT_MAX];

	/* When adding entries and set is full, try to resize the set */
	int (*resize)(struct ip_set *set, bool retried);
	/* Destroy the set */
	void (*destroy)(struct ip_set *set);
	/* Flush the elements */
	void (*flush)(struct ip_set *set);
	/* Expire entries before listing */
	void (*expire)(struct ip_set *set);
	/* List set header data */
	int (*head)(struct ip_set *set, struct sk_buff *skb);
	/* List elements */
	int (*list)(const struct ip_set *set, struct sk_buff *skb,
		    struct netlink_callback *cb);
	/* Keep listing private when resizing runs parallel */
	void (*uref)(struct ip_set *set, struct netlink_callback *cb,
		     bool start);

	/* Return true if "b" set is the same as "a"
	 * according to the create set parameters */
	bool (*same_set)(const struct ip_set *a, const struct ip_set *b);
};

/* The core set type structure */
struct ip_set_type {
	struct list_head list;

	/* Typename */
	char name[IPSET_MAXNAMELEN];
	/* Protocol version */
	u8 protocol;
	/* Set type dimension */
	u8 dimension;
	/*
	 * Supported family: may be NFPROTO_UNSPEC for both
	 * NFPROTO_IPV4/NFPROTO_IPV6.
	 */
	u8 family;
	/* Type revisions */
	u8 revision_min, revision_max;
	/* Set features to control swapping */
	u16 features;

	/* Create set */
	int (*create)(struct net *net, struct ip_set *set,
		      struct nlattr *tb[], u32 flags);

	/* Attribute policies */
	const struct nla_policy create_policy[IPSET_ATTR_CREATE_MAX + 1];
	const struct nla_policy adt_policy[IPSET_ATTR_ADT_MAX + 1];

	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
	struct module *me;
};

/* register and unregister set type */
extern int ip_set_type_register(struct ip_set_type *set_type);
extern void