![stephen hemminger](/assets/img/avatar_default.png)
Function never used in current upstream code. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
510 lines
14 KiB
C
510 lines
14 KiB
C
/* 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@blackhole.kfki.hu>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#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_NOMATCH_FLAG = 6,
|
|
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 = 7,
|
|
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),
|
|
/* 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)
|
|
|
|
/* Extension id, in size order */
|
|
enum ip_set_ext_id {
|
|
IPSET_EXT_ID_COUNTER = 0,
|
|
IPSET_EXT_ID_TIMEOUT,
|
|
IPSET_EXT_ID_COMMENT,
|
|
IPSET_EXT_ID_MAX,
|
|
};
|
|
|
|
/* Extension type */
|
|
struct ip_set_ext_type {
|
|
/* Destroy extension private data (can be NULL) */
|
|
void (*destroy)(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_ext {
|
|
u64 packets;
|
|
u64 bytes;
|
|
u32 timeout;
|
|
char *comment;
|
|
};
|
|
|
|
struct ip_set_counter {
|
|
atomic64_t bytes;
|
|
atomic64_t packets;
|
|
};
|
|
|
|
struct ip_set_comment {
|
|
char *str;
|
|
};
|
|
|
|
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])
|
|
|
|
|
|
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);
|
|
|
|
/* 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 features to control swapping */
|
|
u8 features;
|
|
/* 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;
|
|
|
|
/* 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 ip_set_type_unregister(struct ip_set_type *set_type);
|
|
|
|
/* A generic IP set */
|
|
struct ip_set {
|
|
/* The name of the set */
|
|
char name[IPSET_MAXNAMELEN];
|
|
/* Lock protecting the set data */
|
|
rwlock_t lock;
|
|
/* References to the set */
|
|
u32 ref;
|
|
/* The core set type */
|
|
struct ip_set_type *type;
|
|
/* The type variant doing the real job */
|
|
const struct ip_set_type_variant *variant;
|
|
/* The actual INET family of the set */
|
|
u8 family;
|
|
/* The type revision */
|
|
u8 revision;
|
|
/* Extensions */
|
|
u8 extensions;
|
|
/* Default timeout value, if enabled */
|
|
u32 timeout;
|
|
/* Element data size */
|
|
size_t dsize;
|
|
/* Offsets to extensions in elements */
|
|
size_t offset[IPSET_EXT_ID_MAX];
|
|
/* The type specific data */
|
|
void *data;
|
|
};
|
|
|
|
static inline void
|
|
ip_set_ext_destroy(struct ip_set *set, void *data)
|
|
{
|
|
/* Check that the extension is enabled for the set and
|
|
* call it's destroy function for its extension part in data.
|
|
*/
|
|
if (SET_WITH_COMMENT(set))
|
|
ip_set_extensions[IPSET_EXT_ID_COMMENT].destroy(
|
|
ext_comment(data, set));
|
|
}
|
|
|
|
static inline int
|
|
ip_set_put_flags(struct sk_buff *skb, struct ip_set *set)
|
|
{
|
|
u32 cadt_flags = 0;
|
|
|
|
if (SET_WITH_TIMEOUT(set))
|
|
if (unlikely(nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
|
|
htonl(set->timeout))))
|
|
return -EMSGSIZE;
|
|
if (SET_WITH_COUNTER(set))
|
|
cadt_flags |= IPSET_FLAG_WITH_COUNTERS;
|
|
if (SET_WITH_COMMENT(set))
|
|
cadt_flags |= IPSET_FLAG_WITH_COMMENT;
|
|
|
|
if (!cadt_flags)
|
|
return 0;
|
|
return nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(cadt_flags));
|
|
}
|
|
|
|
static inline void
|
|
ip_set_add_bytes(u64 bytes, struct ip_set_counter *counter)
|
|
{
|
|
atomic64_add((long long)bytes, &(counter)->bytes);
|
|
}
|
|
|
|
static inline void
|
|
ip_set_add_packets(u64 packets, struct ip_set_counter *counter)
|
|
{
|
|
atomic64_add((long long)packets, &(counter)->packets);
|
|
}
|
|
|
|
static inline u64
|
|
ip_set_get_bytes(const struct ip_set_counter *counter)
|
|
{
|
|
return (u64)atomic64_read(&(counter)->bytes);
|
|
}
|
|
|
|
static inline u64
|
|
ip_set_get_packets(const struct ip_set_counter *counter)
|
|
{
|
|
return (u64)atomic64_read(&(counter)->packets);
|
|
}
|
|
|
|
static inline void
|
|
ip_set_update_counter(struct ip_set_counter *counter,
|
|
const struct ip_set_ext *ext,
|
|
struct ip_set_ext *mext, u32 flags)
|
|
{
|
|
if (ext->packets != ULLONG_MAX &&
|
|
!(flags & IPSET_FLAG_SKIP_COUNTER_UPDATE)) {
|
|
ip_set_add_bytes(ext->bytes, counter);
|
|
ip_set_add_packets(ext->packets, counter);
|
|
}
|
|
if (flags & IPSET_FLAG_MATCH_COUNTERS) {
|
|
mext->packets = ip_set_get_packets(counter);
|
|
mext->bytes = ip_set_get_bytes(counter);
|
|
}
|
|
}
|
|
|
|
static inline bool
|
|
ip_set_put_counter(struct sk_buff *skb, struct ip_set_counter *counter)
|
|
{
|
|
return nla_put_net64(skb, IPSET_ATTR_BYTES,
|
|
cpu_to_be64(ip_set_get_bytes(counter))) ||
|
|
nla_put_net64(skb, IPSET_ATTR_PACKETS,
|
|
cpu_to_be64(ip_set_get_packets(counter)));
|
|
}
|
|
|
|
static inline void
|
|
ip_set_init_counter(struct ip_set_counter *counter,
|
|
const struct ip_set_ext *ext)
|
|
{
|
|
if (ext->bytes != ULLONG_MAX)
|
|
atomic64_set(&(counter)->bytes, (long long)(ext->bytes));
|
|
if (ext->packets != ULLONG_MAX)
|
|
atomic64_set(&(counter)->packets, (long long)(ext->packets));
|
|
}
|
|
|
|
/* Netlink CB args */
|
|
enum {
|
|
IPSET_CB_NET = 0,
|
|
IPSET_CB_DUMP,
|
|
IPSET_CB_INDEX,
|
|
IPSET_CB_ARG0,
|
|
IPSET_CB_ARG1,
|
|
IPSET_CB_ARG2,
|
|
};
|
|
|
|
/* register and unregister set references */
|
|
extern ip_set_id_t ip_set_get_byname(struct net *net,
|
|
const char *name, struct ip_set **set);
|
|
extern void ip_set_put_byindex(struct net *net, ip_set_id_t index);
|
|
extern const char *ip_set_name_byindex(struct net *net, ip_set_id_t index);
|
|
extern ip_set_id_t ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index);
|
|
extern void ip_set_nfnl_put(struct net *net, ip_set_id_t index);
|
|
|
|
/* API for iptables set match, and SET target */
|
|
|
|
extern int ip_set_add(ip_set_id_t id, const struct sk_buff *skb,
|
|
const struct xt_action_param *par,
|
|
struct ip_set_adt_opt *opt);
|
|
extern int ip_set_del(ip_set_id_t id, const struct sk_buff *skb,
|
|
const struct xt_action_param *par,
|
|
struct ip_set_adt_opt *opt);
|
|
extern int ip_set_test(ip_set_id_t id, const struct sk_buff *skb,
|
|
const struct xt_action_param *par,
|
|
struct ip_set_adt_opt *opt);
|
|
|
|
/* Utility functions */
|
|
extern void *ip_set_alloc(size_t size);
|
|
extern void ip_set_free(void *members);
|
|
extern int ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr);
|
|
extern int ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr);
|
|
extern size_t ip_set_elem_len(struct ip_set *set, struct nlattr *tb[],
|
|
size_t len);
|
|
extern int ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[],
|
|
struct ip_set_ext *ext);
|
|
|
|
static inline int
|
|
ip_set_get_hostipaddr4(struct nlattr *nla, u32 *ipaddr)
|
|
{
|
|
__be32 ip;
|
|
int ret = ip_set_get_ipaddr4(nla, &ip);
|
|
|
|
if (ret)
|
|
return ret;
|
|
*ipaddr = ntohl(ip);
|
|
return 0;
|
|
}
|
|
|
|
/* Ignore IPSET_ERR_EXIST errors if asked to do so? */
|
|
static inline bool
|
|
ip_set_eexist(int ret, u32 flags)
|
|
{
|
|
return ret == -IPSET_ERR_EXIST && (flags & IPSET_FLAG_EXIST);
|
|
}
|
|
|
|
/* Match elements marked with nomatch */
|
|
static inline bool
|
|
ip_set_enomatch(int ret, u32 flags, enum ipset_adt adt, struct ip_set *set)
|
|
{
|
|
return adt == IPSET_TEST &&
|
|
(set->type->features & IPSET_TYPE_NOMATCH) &&
|
|
((flags >> 16) & IPSET_FLAG_NOMATCH) &&
|
|
(ret > 0 || ret == -ENOTEMPTY);
|
|
}
|
|
|
|
/* Check the NLA_F_NET_BYTEORDER flag */
|
|
static inline bool
|
|
ip_set_attr_netorder(struct nlattr *tb[], int type)
|
|
{
|
|
return tb[type] && (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
|
|
}
|
|
|
|
static inline bool
|
|
ip_set_optattr_netorder(struct nlattr *tb[], int type)
|
|
{
|
|
return !tb[type] || (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
|
|
}
|
|
|
|
/* Useful converters */
|
|
static inline u32
|
|
ip_set_get_h32(const struct nlattr *attr)
|
|
{
|
|
return ntohl(nla_get_be32(attr));
|
|
}
|
|
|
|
static inline u16
|
|
ip_set_get_h16(const struct nlattr *attr)
|
|
{
|
|
return ntohs(nla_get_be16(attr));
|
|
}
|
|
|
|
#define ipset_nest_start(skb, attr) nla_nest_start(skb, attr | NLA_F_NESTED)
|
|
#define ipset_nest_end(skb, start) nla_nest_end(skb, start)
|
|
|
|
static inline int nla_put_ipaddr4(struct sk_buff *skb, int type, __be32 ipaddr)
|
|
{
|
|
struct nlattr *__nested = ipset_nest_start(skb, type);
|
|
int ret;
|
|
|
|
if (!__nested)
|
|
return -EMSGSIZE;
|
|
ret = nla_put_net32(skb, IPSET_ATTR_IPADDR_IPV4, ipaddr);
|
|
if (!ret)
|
|
ipset_nest_end(skb, __nested);
|
|
return ret;
|
|
}
|
|
|
|
static inline int nla_put_ipaddr6(struct sk_buff *skb, int type,
|
|
const struct in6_addr *ipaddrptr)
|
|
{
|
|
struct nlattr *__nested = ipset_nest_start(skb, type);
|
|
int ret;
|
|
|
|
if (!__nested)
|
|
return -EMSGSIZE;
|
|
ret = nla_put(skb, IPSET_ATTR_IPADDR_IPV6,
|
|
sizeof(struct in6_addr), ipaddrptr);
|
|
if (!ret)
|
|
ipset_nest_end(skb, __nested);
|
|
return ret;
|
|
}
|
|
|
|
/* Get address from skbuff */
|
|
static inline __be32
|
|
ip4addr(const struct sk_buff *skb, bool src)
|
|
{
|
|
return src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
|
|
}
|
|
|
|
static inline void
|
|
ip4addrptr(const struct sk_buff *skb, bool src, __be32 *addr)
|
|
{
|
|
*addr = src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
|
|
}
|
|
|
|
static inline void
|
|
ip6addrptr(const struct sk_buff *skb, bool src, struct in6_addr *addr)
|
|
{
|
|
memcpy(addr, src ? &ipv6_hdr(skb)->saddr : &ipv6_hdr(skb)->daddr,
|
|
sizeof(*addr));
|
|
}
|
|
|
|
/* Calculate the bytes required to store the inclusive range of a-b */
|
|
static inline int
|
|
bitmap_bytes(u32 a, u32 b)
|
|
{
|
|
return 4 * ((((b - a + 8) / 8) + 3) / 4);
|
|
}
|
|
|
|
#include <linux/netfilter/ipset/ip_set_timeout.h>
|
|
#include <linux/netfilter/ipset/ip_set_comment.h>
|
|
|
|
static inline int
|
|
ip_set_put_extensions(struct sk_buff *skb, const struct ip_set *set,
|
|
const void *e, bool active)
|
|
{
|
|
if (SET_WITH_TIMEOUT(set)) {
|
|
unsigned long *timeout = ext_timeout(e, set);
|
|
|
|
if (nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
|
|
htonl(active ? ip_set_timeout_get(timeout)
|
|
: *timeout)))
|
|
return -EMSGSIZE;
|
|
}
|
|
if (SET_WITH_COUNTER(set) &&
|
|
ip_set_put_counter(skb, ext_counter(e, set)))
|
|
return -EMSGSIZE;
|
|
if (SET_WITH_COMMENT(set) &&
|
|
ip_set_put_comment(skb, ext_comment(e, set)))
|
|
return -EMSGSIZE;
|
|
return 0;
|
|
}
|
|
|
|
#define IP_SET_INIT_KEXT(skb, opt, set) \
|
|
{ .bytes = (skb)->len, .packets = 1, \
|
|
.timeout = ip_set_adt_opt_timeout(opt, set) }
|
|
|
|
#define IP_SET_INIT_UEXT(set) \
|
|
{ .bytes = ULLONG_MAX, .packets = ULLONG_MAX, \
|
|
.timeout = (set)->timeout }
|
|
|
|
#define IP_SET_INIT_CIDR(a, b) ((a) ? (a) : (b))
|
|
|
|
#define IPSET_CONCAT(a, b) a##b
|
|
#define IPSET_TOKEN(a, b) IPSET_CONCAT(a, b)
|
|
|
|
#endif /*_IP_SET_H */
|