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netfilter: ipset: Prepare ipset to support multiple networks for hash types 

In order to support hash:net,net, hash:net,port,net etc. types,
arrays are introduced for the book-keeping of existing cidr sizes
and network numbers in a set.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
This commit is contained in:
Jozsef Kadlecsik 2013-09-30 09:05:54 +02:00
parent 5e04c0c38c
commit a04d8b6bd9
6 changed files with 50 additions and 46 deletions
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2
include/linux/netfilter/ipset/ip_set.h
View File

@ -398,6 +398,8 @@ bitmap_bytes(u32 a, u32 b)
{ .bytes = ULLONG_MAX, .packets = ULLONG_MAX, \
.timeout = (map)->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)

78
net/netfilter/ipset/ip_set_hash_gen.h
View File

@ -77,10 +77,14 @@ struct htable {
#define hbucket(h, i) (&((h)->bucket[i]))
#ifndef IPSET_NET_COUNT
#define IPSET_NET_COUNT 1
#endif
/* Book-keeping of the prefixes added to the set */
struct net_prefixes {
u8 cidr; /* the different cidr values in the set */
u32 nets; /* number of elements per cidr */
u32 nets[IPSET_NET_COUNT]; /* number of elements per cidr */
u8 cidr[IPSET_NET_COUNT]; /* the different cidr values in the set */
};
/* Compute the hash table size */
@ -165,13 +169,13 @@ hbucket_elem_add(struct hbucket *n, u8 ahash_max, size_t dsize)
#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)
#define NLEN(family) (SET_HOST_MASK(family) + 1)
#else
#define NETS_LENGTH(family) SET_HOST_MASK(family)
#define NLEN(family) SET_HOST_MASK(family)
#endif
#else
#define NETS_LENGTH(family) 0
#define NLEN(family) 0
#endif /* IP_SET_HASH_WITH_NETS */
#define ext_timeout(e, h) \
@ -296,49 +300,49 @@ struct htype {
/* Network cidr size book keeping when the hash stores different
* sized networks */
static void
mtype_add_cidr(struct htype *h, u8 cidr, u8 nets_length)
mtype_add_cidr(struct htype *h, u8 cidr, u8 nets_length, u8 n)
{
int i, j;
/* Add in increasing prefix order, so larger cidr first */
for (i = 0, j = -1; i < nets_length && h->nets[i].nets; i++) {
for (i = 0, j = -1; i < nets_length && h->nets[i].nets[n]; i++) {
if (j != -1)
continue;
else if (h->nets[i].cidr < cidr)
else if (h->nets[i].cidr[n] < cidr)
j = i;
else if (h->nets[i].cidr == cidr) {
h->nets[i].nets++;
else if (h->nets[i].cidr[n] == cidr) {
h->nets[i].nets[n]++;
return;
}
}
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[n] = h->nets[i - 1].cidr[n];
h->nets[i].nets[n] = h->nets[i - 1].nets[n];
}
}
h->nets[i].cidr = cidr;
h->nets[i].nets = 1;
h->nets[i].cidr[n] = cidr;
h->nets[i].nets[n] = 1;
}
static void
mtype_del_cidr(struct htype *h, u8 cidr, u8 nets_length)
mtype_del_cidr(struct htype *h, u8 cidr, u8 nets_length, u8 n)
{
u8 i, j, net_end = nets_length - 1;
for (i = 0; i < nets_length; i++) {
if (h->nets[i].cidr != cidr)
if (h->nets[i].cidr[n] != cidr)
continue;
if (h->nets[i].nets > 1 || i == net_end ||
h->nets[i + 1].nets == 0) {
h->nets[i].nets--;
if (h->nets[i].nets[n] > 1 || i == net_end ||
h->nets[i + 1].nets[n] == 0) {
h->nets[i].nets[n]--;
return;
}
for (j = i; j < net_end && h->nets[j].nets; j++) {
h->nets[j].cidr = h->nets[j + 1].cidr;
h->nets[j].nets = h->nets[j + 1].nets;
for (j = i; j < net_end && h->nets[j].nets[n]; j++) {
h->nets[j].cidr[n] = h->nets[j + 1].cidr[n];
h->nets[j].nets[n] = h->nets[j + 1].nets[n];
}
h->nets[j].nets = 0;
h->nets[j].nets[n] = 0;
return;
}
}
@ -382,8 +386,7 @@ mtype_flush(struct ip_set *set)
}
}
#ifdef IP_SET_HASH_WITH_NETS
memset(h->nets, 0, sizeof(struct net_prefixes)
* NETS_LENGTH(set->family));
memset(h->nets, 0, sizeof(struct net_prefixes) * NLEN(set->family));
#endif
h->elements = 0;
}
@ -459,7 +462,7 @@ mtype_expire(struct htype *h, u8 nets_length, size_t dsize)
pr_debug("expired %u/%u\n", i, j);
#ifdef IP_SET_HASH_WITH_NETS
mtype_del_cidr(h, CIDR(data->cidr),
nets_length);
nets_length, 0);
#endif
if (j != n->pos - 1)
/* Not last one */
@ -494,7 +497,7 @@ mtype_gc(unsigned long ul_set)
pr_debug("called\n");
write_lock_bh(&set->lock);
mtype_expire(h, NETS_LENGTH(set->family), h->dsize);
mtype_expire(h, NLEN(set->family), h->dsize);
write_unlock_bh(&set->lock);
h->gc.expires = jiffies + IPSET_GC_PERIOD(h->timeout) * HZ;
@ -523,8 +526,7 @@ mtype_resize(struct ip_set *set, bool retried)
if (SET_WITH_TIMEOUT(set) && !retried) {
i = h->elements;
write_lock_bh(&set->lock);
mtype_expire(set->data, NETS_LENGTH(set->family),
h->dsize);
mtype_expire(set->data, NLEN(set->family), h->dsize);
write_unlock_bh(&set->lock);
if (h->elements < i)
return 0;
@ -607,7 +609,7 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
if (SET_WITH_TIMEOUT(set) && h->elements >= h->maxelem)
/* FIXME: when set is full, we slow down here */
mtype_expire(h, NETS_LENGTH(set->family), h->dsize);
mtype_expire(h, NLEN(set->family), h->dsize);
if (h->elements >= h->maxelem) {
if (net_ratelimit())
@ -645,8 +647,8 @@ reuse_slot:
/* Fill out reused slot */
data = ahash_data(n, j, h->dsize);
#ifdef IP_SET_HASH_WITH_NETS
mtype_del_cidr(h, CIDR(data->cidr), NETS_LENGTH(set->family));
mtype_add_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
mtype_del_cidr(h, CIDR(data->cidr), NLEN(set->family), 0);
mtype_add_cidr(h, CIDR(d->cidr), NLEN(set->family), 0);
#endif
} else {
/* Use/create a new slot */
@ -659,7 +661,7 @@ reuse_slot:
}
data = ahash_data(n, n->pos++, h->dsize);
#ifdef IP_SET_HASH_WITH_NETS
mtype_add_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
mtype_add_cidr(h, CIDR(d->cidr), NLEN(set->family), 0);
#endif
h->elements++;
}
@ -711,7 +713,7 @@ mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext,
n->pos--;
h->elements--;
#ifdef IP_SET_HASH_WITH_NETS
mtype_del_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
mtype_del_cidr(h, CIDR(d->cidr), NLEN(set->family), 0);
#endif
if (n->pos + AHASH_INIT_SIZE < n->size) {
void *tmp = kzalloc((n->size - AHASH_INIT_SIZE)
@ -760,11 +762,11 @@ mtype_test_cidrs(struct ip_set *set, struct mtype_elem *d,
struct mtype_elem *data;
int i, j = 0;
u32 key, multi = 0;
u8 nets_length = NETS_LENGTH(set->family);
u8 nets_length = NLEN(set->family);
pr_debug("test by nets\n");
for (; j < nets_length && h->nets[j].nets && !multi; j++) {
mtype_data_netmask(d, h->nets[j].cidr);
for (; j < nets_length && h->nets[j].nets[0] && !multi; j++) {
mtype_data_netmask(d, h->nets[j].cidr[0]);
key = HKEY(d, h->initval, t->htable_bits);
n = hbucket(t, key);
for (i = 0; i < n->pos; i++) {
@ -839,7 +841,7 @@ mtype_head(struct ip_set *set, struct sk_buff *skb)
size_t memsize;
t = rcu_dereference_bh_nfnl(h->table);
memsize = mtype_ahash_memsize(h, t, NETS_LENGTH(set->family));
memsize = mtype_ahash_memsize(h, t, NLEN(set->family));
nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
if (!nested)

4
net/netfilter/ipset/ip_set_hash_ipportnet.c
View File

@ -170,7 +170,7 @@ hash_ipportnet4_kadt(struct ip_set *set, const struct sk_buff *skb,
const struct hash_ipportnet *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_ipportnet4_elem e = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr - 1 : HOST_MASK - 1
.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK) - 1,
};
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
@ -454,7 +454,7 @@ hash_ipportnet6_kadt(struct ip_set *set, const struct sk_buff *skb,
const struct hash_ipportnet *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_ipportnet6_elem e = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr - 1 : HOST_MASK - 1
.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK) - 1,
};
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);

4
net/netfilter/ipset/ip_set_hash_net.c
View File

@ -143,7 +143,7 @@ hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
const struct hash_net *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_net4_elem e = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK
.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
};
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
@ -338,7 +338,7 @@ hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
const struct hash_net *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_net6_elem e = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK
.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
};
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);

4
net/netfilter/ipset/ip_set_hash_netiface.c
View File

@ -265,7 +265,7 @@ hash_netiface4_kadt(struct ip_set *set, const struct sk_buff *skb,
struct hash_netiface *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netiface4_elem e = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK,
.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
.elem = 1,
};
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
@ -534,7 +534,7 @@ hash_netiface6_kadt(struct ip_set *set, const struct sk_buff *skb,
struct hash_netiface *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netiface6_elem e = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK,
.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
.elem = 1,
};
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);

4
net/netfilter/ipset/ip_set_hash_netport.c
View File

@ -162,7 +162,7 @@ hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb,
const struct hash_netport *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netport4_elem e = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr - 1 : HOST_MASK - 1
.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK) - 1,
};
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
@ -407,7 +407,7 @@ hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb,
const struct hash_netport *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netport6_elem e = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr - 1 : HOST_MASK - 1,
.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK) - 1,
};
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);