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netfilter: ipset: add forceadd kernel support for hash set types

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Adds a new property for hash set types, where if a set is created
with the 'forceadd' option and the set becomes full the next addition
to the set may succeed and evict a random entry from the set.

To keep overhead low eviction is done very simply. It checks to see
which bucket the new entry would be added. If the bucket's pos value
is non-zero (meaning there's at least one entry in the bucket) it
replaces the first entry in the bucket. If pos is zero, then it continues
down the normal add process.

This property is useful if you have a set for 'ban' lists where it may
not matter if you release some entries from the set early.

Signed-off-by: Josh Hunt <johunt@akamai.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
This commit is contained in:
Josh Hunt 2014-02-28 22:14:57 -05:00 committed by Jozsef Kadlecsik
parent 6843bc3c56
commit 07cf8f5ae2
14 changed files with 40 additions and 12 deletions
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3
include/linux/netfilter/ipset/ip_set.h
View file

@ -65,6 +65,7 @@ enum ip_set_extension {
#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_FORCEADD(s) ((s)->flags & IPSET_CREATE_FLAG_FORCEADD)
/* Extension id, in size order */
enum ip_set_ext_id {
@ -255,6 +256,8 @@ ip_set_put_flags(struct sk_buff *skb, struct ip_set *set)
cadt_flags |= IPSET_FLAG_WITH_COUNTERS;
if (SET_WITH_COMMENT(set))
cadt_flags |= IPSET_FLAG_WITH_COMMENT;
if (SET_WITH_FORCEADD(set))
cadt_flags |= IPSET_FLAG_WITH_FORCEADD;
if (!cadt_flags)
return 0;

7
include/uapi/linux/netfilter/ipset/ip_set.h
View file

@ -185,13 +185,16 @@ enum ipset_cadt_flags {
IPSET_FLAG_WITH_COUNTERS = (1 << IPSET_FLAG_BIT_WITH_COUNTERS),
IPSET_FLAG_BIT_WITH_COMMENT = 4,
IPSET_FLAG_WITH_COMMENT = (1 << IPSET_FLAG_BIT_WITH_COMMENT),
IPSET_FLAG_BIT_WITH_FORCEADD = 5,
IPSET_FLAG_WITH_FORCEADD = (1 << IPSET_FLAG_BIT_WITH_FORCEADD),
IPSET_FLAG_CADT_MAX = 15,
};
/* The flag bits which correspond to the non-extension create flags */
enum ipset_create_flags {
IPSET_CREATE_FLAG_NONE = 0,
IPSET_CREATE_FLAG_MAX = 7,
IPSET_CREATE_FLAG_BIT_FORCEADD = 0,
IPSET_CREATE_FLAG_FORCEADD = (1 << IPSET_CREATE_FLAG_BIT_FORCEADD),
IPSET_CREATE_FLAG_BIT_MAX = 7,
};
/* Commands with settype-specific attributes */

2
net/netfilter/ipset/ip_set_core.c
View file

@ -368,6 +368,8 @@ ip_set_elem_len(struct ip_set *set, struct nlattr *tb[], size_t len)
if (tb[IPSET_ATTR_CADT_FLAGS])
cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
if (cadt_flags & IPSET_FLAG_WITH_FORCEADD)
set->flags |= IPSET_CREATE_FLAG_FORCEADD;
for (id = 0; id < IPSET_EXT_ID_MAX; id++) {
if (!add_extension(id, cadt_flags, tb))
continue;

12
net/netfilter/ipset/ip_set_hash_gen.h
View file

@ -633,6 +633,18 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
bool flag_exist = flags & IPSET_FLAG_EXIST;
u32 key, multi = 0;
if (h->elements >= h->maxelem && SET_WITH_FORCEADD(set)) {
rcu_read_lock_bh();
t = rcu_dereference_bh(h->table);
key = HKEY(value, h->initval, t->htable_bits);
n = hbucket(t,key);
if (n->pos) {
/* Choosing the first entry in the array to replace */
j = 0;
goto reuse_slot;
}
rcu_read_unlock_bh();
}
if (SET_WITH_TIMEOUT(set) && h->elements >= h->maxelem)
/* FIXME: when set is full, we slow down here */
mtype_expire(set, h, NLEN(set->family), set->dsize);

3
net/netfilter/ipset/ip_set_hash_ip.c
View file

@ -25,7 +25,8 @@
#define IPSET_TYPE_REV_MIN 0
/* 1 Counters support */
#define IPSET_TYPE_REV_MAX 2 /* Comments support */
/* 2 Comments support */
#define IPSET_TYPE_REV_MAX 3 /* Forceadd support */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");

2
net/netfilter/ipset/ip_set_hash_ipmark.c
View file

@ -25,7 +25,7 @@
#include <linux/netfilter/ipset/ip_set_hash.h>
#define IPSET_TYPE_REV_MIN 0
#define IPSET_TYPE_REV_MAX 0
#define IPSET_TYPE_REV_MAX 1 /* Forceadd support */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vytas Dauksa <vytas.dauksa@smoothwall.net>");

3
net/netfilter/ipset/ip_set_hash_ipport.c
View file

@ -27,7 +27,8 @@
#define IPSET_TYPE_REV_MIN 0
/* 1 SCTP and UDPLITE support added */
/* 2 Counters support added */
#define IPSET_TYPE_REV_MAX 3 /* Comments support added */
/* 3 Comments support added */
#define IPSET_TYPE_REV_MAX 4 /* Forceadd support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");

3
net/netfilter/ipset/ip_set_hash_ipportip.c
View file

@ -27,7 +27,8 @@
#define IPSET_TYPE_REV_MIN 0
/* 1 SCTP and UDPLITE support added */
/* 2 Counters support added */
#define IPSET_TYPE_REV_MAX 3 /* Comments support added */
/* 3 Comments support added */
#define IPSET_TYPE_REV_MAX 4 /* Forceadd support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");

3
net/netfilter/ipset/ip_set_hash_ipportnet.c
View file

@ -29,7 +29,8 @@
/* 2 Range as input support for IPv4 added */
/* 3 nomatch flag support added */
/* 4 Counters support added */
#define IPSET_TYPE_REV_MAX 5 /* Comments support added */
/* 5 Comments support added */
#define IPSET_TYPE_REV_MAX 6 /* Forceadd support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");

3
net/netfilter/ipset/ip_set_hash_net.c
View file

@ -26,7 +26,8 @@
/* 1 Range as input support for IPv4 added */
/* 2 nomatch flag support added */
/* 3 Counters support added */
#define IPSET_TYPE_REV_MAX 4 /* Comments support added */
/* 4 Comments support added */
#define IPSET_TYPE_REV_MAX 5 /* Forceadd support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");

3
net/netfilter/ipset/ip_set_hash_netiface.c
View file

@ -27,7 +27,8 @@
/* 1 nomatch flag support added */
/* 2 /0 support added */
/* 3 Counters support added */
#define IPSET_TYPE_REV_MAX 4 /* Comments support added */
/* 4 Comments support added */
#define IPSET_TYPE_REV_MAX 5 /* Forceadd support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");

2
net/netfilter/ipset/ip_set_hash_netnet.c
View file

@ -24,7 +24,7 @@
#include <linux/netfilter/ipset/ip_set_hash.h>
#define IPSET_TYPE_REV_MIN 0
#define IPSET_TYPE_REV_MAX 0
#define IPSET_TYPE_REV_MAX 1 /* Forceadd support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>");

3
net/netfilter/ipset/ip_set_hash_netport.c
View file

@ -28,7 +28,8 @@
/* 2 Range as input support for IPv4 added */
/* 3 nomatch flag support added */
/* 4 Counters support added */
#define IPSET_TYPE_REV_MAX 5 /* Comments support added */
/* 5 Comments support added */
#define IPSET_TYPE_REV_MAX 6 /* Forceadd support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");

3
net/netfilter/ipset/ip_set_hash_netportnet.c
View file

@ -25,7 +25,8 @@
#include <linux/netfilter/ipset/ip_set_hash.h>
#define IPSET_TYPE_REV_MIN 0
#define IPSET_TYPE_REV_MAX 0 /* Comments support added */
/* 0 Comments support added */
#define IPSET_TYPE_REV_MAX 1 /* Forceadd support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>");