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netfilter: ipset: Rewrite cidr book keeping to handle /0 

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
This commit is contained in:
Jozsef Kadlecsik 2012-09-22 22:42:08 +02:00
parent b9fed74818
commit 85f8c13e41
1 changed files with 55 additions and 49 deletions
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104
include/linux/netfilter/ipset/ip_set_ahash.h
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@ -137,50 +137,59 @@ htable_bits(u32 hashsize)
#endif
#define SET_HOST_MASK(family) (family == AF_INET ? 32 : 128)
#ifdef IP_SET_HASH_WITH_MULTI
#define NETS_LENGTH(family) (SET_HOST_MASK(family) + 1)
#else
#define NETS_LENGTH(family) SET_HOST_MASK(family)
#endif
/* Network cidr size book keeping when the hash stores different
* sized networks */
static void
add_cidr(struct ip_set_hash *h, u8 cidr, u8 host_mask)
add_cidr(struct ip_set_hash *h, u8 cidr, u8 nets_length)
{
u8 i;
int i, j;
++h->nets[cidr-1].nets;
pr_debug("add_cidr added %u: %u\n", cidr, h->nets[cidr-1].nets);
if (h->nets[cidr-1].nets > 1)
return;
/* New cidr size */
for (i = 0; i < host_mask && h->nets[i].cidr; i++) {
/* Add in increasing prefix order, so larger cidr first */
if (h->nets[i].cidr < cidr)
swap(h->nets[i].cidr, cidr);
/* Add in increasing prefix order, so larger cidr first */
for (i = 0, j = -1; i < nets_length && h->nets[i].nets; i++) {
if (j != -1)
continue;
else if (h->nets[i].cidr < cidr)
j = i;
else if (h->nets[i].cidr == cidr) {
h->nets[i].nets++;
return;
}
}
if (i < host_mask)
h->nets[i].cidr = cidr;
if (j != -1) {
for (; i > j; i--) {
h->nets[i].cidr = h->nets[i - 1].cidr;
h->nets[i].nets = h->nets[i - 1].nets;
}
}
h->nets[i].cidr = cidr;
h->nets[i].nets = 1;
}
static void
del_cidr(struct ip_set_hash *h, u8 cidr, u8 host_mask)
del_cidr(struct ip_set_hash *h, u8 cidr, u8 nets_length)
{
u8 i;
u8 i, j;
--h->nets[cidr-1].nets;
for (i = 0; i < nets_length - 1 && h->nets[i].cidr != cidr; i++)
;
h->nets[i].nets--;
pr_debug("del_cidr deleted %u: %u\n", cidr, h->nets[cidr-1].nets);
if (h->nets[cidr-1].nets != 0)
if (h->nets[i].nets != 0)
return;
/* All entries with this cidr size deleted, so cleanup h->cidr[] */
for (i = 0; i < host_mask - 1 && h->nets[i].cidr; i++) {
if (h->nets[i].cidr == cidr)
h->nets[i].cidr = cidr = h->nets[i+1].cidr;
for (j = i; j < nets_length - 1 && h->nets[j].nets; j++) {
h->nets[j].cidr = h->nets[j + 1].cidr;
h->nets[j].nets = h->nets[j + 1].nets;
}
h->nets[i - 1].cidr = 0;
}
#else
#define NETS_LENGTH(family) 0
#endif
/* Destroy the hashtable part of the set */
@ -202,14 +211,14 @@ ahash_destroy(struct htable *t)
/* Calculate the actual memory size of the set data */
static size_t
ahash_memsize(const struct ip_set_hash *h, size_t dsize, u8 host_mask)
ahash_memsize(const struct ip_set_hash *h, size_t dsize, u8 nets_length)
{
u32 i;
struct htable *t = h->table;
size_t memsize = sizeof(*h)
+ sizeof(*t)
#ifdef IP_SET_HASH_WITH_NETS
+ sizeof(struct ip_set_hash_nets) * host_mask
+ sizeof(struct ip_set_hash_nets) * nets_length
#endif
+ jhash_size(t->htable_bits) * sizeof(struct hbucket);
@ -238,7 +247,7 @@ ip_set_hash_flush(struct ip_set *set)
}
#ifdef IP_SET_HASH_WITH_NETS
memset(h->nets, 0, sizeof(struct ip_set_hash_nets)
* SET_HOST_MASK(set->family));
* NETS_LENGTH(set->family));
#endif
h->elements = 0;
}
@ -271,9 +280,6 @@ ip_set_hash_destroy(struct ip_set *set)
(jhash2((u32 *)(data), HKEY_DATALEN/sizeof(u32), initval) \
& jhash_mask(htable_bits))
#define CONCAT(a, b, c) a##b##c
#define TOKEN(a, b, c) CONCAT(a, b, c)
/* Type/family dependent function prototypes */
#define type_pf_data_equal TOKEN(TYPE, PF, _data_equal)
@ -478,7 +484,7 @@ type_pf_add(struct ip_set *set, void *value, u32 timeout, u32 flags)
}
#ifdef IP_SET_HASH_WITH_NETS
add_cidr(h, CIDR(d->cidr), HOST_MASK);
add_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
#endif
h->elements++;
out:
@ -513,7 +519,7 @@ type_pf_del(struct ip_set *set, void *value, u32 timeout, u32 flags)
n->pos--;
h->elements--;
#ifdef IP_SET_HASH_WITH_NETS
del_cidr(h, CIDR(d->cidr), HOST_MASK);
del_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
#endif
if (n->pos + AHASH_INIT_SIZE < n->size) {
void *tmp = kzalloc((n->size - AHASH_INIT_SIZE)
@ -546,10 +552,10 @@ type_pf_test_cidrs(struct ip_set *set, struct type_pf_elem *d, u32 timeout)
const struct type_pf_elem *data;
int i, j = 0;
u32 key, multi = 0;
u8 host_mask = SET_HOST_MASK(set->family);
u8 nets_length = NETS_LENGTH(set->family);
pr_debug("test by nets\n");
for (; j < host_mask && h->nets[j].cidr && !multi; j++) {
for (; j < nets_length && h->nets[j].nets && !multi; j++) {
type_pf_data_netmask(d, h->nets[j].cidr);
key = HKEY(d, h->initval, t->htable_bits);
n = hbucket(t, key);
@ -604,7 +610,7 @@ type_pf_head(struct ip_set *set, struct sk_buff *skb)
memsize = ahash_memsize(h, with_timeout(h->timeout)
? sizeof(struct type_pf_telem)
: sizeof(struct type_pf_elem),
set->family == AF_INET ? 32 : 128);
NETS_LENGTH(set->family));
read_unlock_bh(&set->lock);
nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
@ -783,7 +789,7 @@ type_pf_elem_tadd(struct hbucket *n, const struct type_pf_elem *value,
/* Delete expired elements from the hashtable */
static void
type_pf_expire(struct ip_set_hash *h)
type_pf_expire(struct ip_set_hash *h, u8 nets_length)
{
struct htable *t = h->table;
struct hbucket *n;
@ -798,7 +804,7 @@ type_pf_expire(struct ip_set_hash *h)
if (type_pf_data_expired(data)) {
pr_debug("expired %u/%u\n", i, j);
#ifdef IP_SET_HASH_WITH_NETS
del_cidr(h, CIDR(data->cidr), HOST_MASK);
del_cidr(h, CIDR(data->cidr), nets_length);
#endif
if (j != n->pos - 1)
/* Not last one */
@ -839,7 +845,7 @@ type_pf_tresize(struct ip_set *set, bool retried)
if (!retried) {
i = h->elements;
write_lock_bh(&set->lock);
type_pf_expire(set->data);
type_pf_expire(set->data, NETS_LENGTH(set->family));
write_unlock_bh(&set->lock);
if (h->elements < i)
return 0;
@ -904,7 +910,7 @@ type_pf_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
if (h->elements >= h->maxelem)
/* FIXME: when set is full, we slow down here */
type_pf_expire(h);
type_pf_expire(h, NETS_LENGTH(set->family));
if (h->elements >= h->maxelem) {
if (net_ratelimit())
pr_warning("Set %s is full, maxelem %u reached\n",
@ -933,8 +939,8 @@ type_pf_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
if (j != AHASH_MAX(h) + 1) {
data = ahash_tdata(n, j);
#ifdef IP_SET_HASH_WITH_NETS
del_cidr(h, CIDR(data->cidr), HOST_MASK);
add_cidr(h, CIDR(d->cidr), HOST_MASK);
del_cidr(h, CIDR(data->cidr), NETS_LENGTH(set->family));
add_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
#endif
type_pf_data_copy(data, d);
type_pf_data_timeout_set(data, timeout);
@ -952,7 +958,7 @@ type_pf_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
}
#ifdef IP_SET_HASH_WITH_NETS
add_cidr(h, CIDR(d->cidr), HOST_MASK);
add_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
#endif
h->elements++;
out:
@ -986,7 +992,7 @@ type_pf_tdel(struct ip_set *set, void *value, u32 timeout, u32 flags)
n->pos--;
h->elements--;
#ifdef IP_SET_HASH_WITH_NETS
del_cidr(h, CIDR(d->cidr), HOST_MASK);
del_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
#endif
if (n->pos + AHASH_INIT_SIZE < n->size) {
void *tmp = kzalloc((n->size - AHASH_INIT_SIZE)
@ -1016,9 +1022,9 @@ type_pf_ttest_cidrs(struct ip_set *set, struct type_pf_elem *d, u32 timeout)
struct hbucket *n;
int i, j = 0;
u32 key, multi = 0;
u8 host_mask = SET_HOST_MASK(set->family);
u8 nets_length = NETS_LENGTH(set->family);
for (; j < host_mask && h->nets[j].cidr && !multi; j++) {
for (; j < nets_length && h->nets[j].nets && !multi; j++) {
type_pf_data_netmask(d, h->nets[j].cidr);
key = HKEY(d, h->initval, t->htable_bits);
n = hbucket(t, key);
@ -1147,7 +1153,7 @@ type_pf_gc(unsigned long ul_set)
pr_debug("called\n");
write_lock_bh(&set->lock);
type_pf_expire(h);
type_pf_expire(h, NETS_LENGTH(set->family));
write_unlock_bh(&set->lock);
h->gc.expires = jiffies + IPSET_GC_PERIOD(h->timeout) * HZ;