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netfilter: ipset: hash:net,iface fixed to handle overlapping nets behind different interfaces

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If overlapping networks with different interfaces was added to
the set, the type did not handle it properly. Example

    ipset create test hash:net,iface
    ipset add test 192.168.0.0/16,eth0
    ipset add test 192.168.0.0/24,eth1

Now, if a packet was sent from 192.168.0.0/24,eth0, the type returned
a match.

In the patch the algorithm is fixed in order to correctly handle
overlapping networks.

Limitation: the same network cannot be stored with more than 64 different
interfaces in a single set.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Jozsef Kadlecsik 2011-07-21 12:06:18 +02:00 committed by Patrick McHardy
parent a6a7b759ba
commit 89dc79b787
8 changed files with 121 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

92
include/linux/netfilter/ipset/ip_set_ahash.h
View File

@ -28,7 +28,32 @@
/* Number of elements to store in an initial array block */
#define AHASH_INIT_SIZE 4
/* Max number of elements to store in an array block */
#define AHASH_MAX_SIZE (3*4)
#define AHASH_MAX_SIZE (3*AHASH_INIT_SIZE)
/* Max number of elements can be tuned */
#ifdef IP_SET_HASH_WITH_MULTI
#define AHASH_MAX(h) ((h)->ahash_max)
static inline u8
tune_ahash_max(u8 curr, u32 multi)
{
u32 n;
if (multi < curr)
return curr;
n = curr + AHASH_INIT_SIZE;
/* Currently, at listing one hash bucket must fit into a message.
* Therefore we have a hard limit here.
*/
return n > curr && n <= 64 ? n : curr;
}
#define TUNE_AHASH_MAX(h, multi) \
((h)->ahash_max = tune_ahash_max((h)->ahash_max, multi))
#else
#define AHASH_MAX(h) AHASH_MAX_SIZE
#define TUNE_AHASH_MAX(h, multi)
#endif
/* A hash bucket */
struct hbucket {
@ -60,6 +85,9 @@ struct ip_set_hash {
u32 timeout; /* timeout value, if enabled */
struct timer_list gc; /* garbage collection when timeout enabled */
struct type_pf_next next; /* temporary storage for uadd */
#ifdef IP_SET_HASH_WITH_MULTI
u8 ahash_max; /* max elements in an array block */
#endif
#ifdef IP_SET_HASH_WITH_NETMASK
u8 netmask; /* netmask value for subnets to store */
#endif
@ -279,12 +307,13 @@ ip_set_hash_destroy(struct ip_set *set)
/* Add an element to the hash table when resizing the set:
* we spare the maintenance of the internal counters. */
static int
type_pf_elem_add(struct hbucket *n, const struct type_pf_elem *value)
type_pf_elem_add(struct hbucket *n, const struct type_pf_elem *value,
u8 ahash_max)
{
if (n->pos >= n->size) {
void *tmp;
if (n->size >= AHASH_MAX_SIZE)
if (n->size >= ahash_max)
/* Trigger rehashing */
return -EAGAIN;
@ -339,7 +368,7 @@ type_pf_resize(struct ip_set *set, bool retried)
for (j = 0; j < n->pos; j++) {
data = ahash_data(n, j);
m = hbucket(t, HKEY(data, h->initval, htable_bits));
ret = type_pf_elem_add(m, data);
ret = type_pf_elem_add(m, data, AHASH_MAX(h));
if (ret < 0) {
read_unlock_bh(&set->lock);
ahash_destroy(t);
@ -376,7 +405,7 @@ type_pf_add(struct ip_set *set, void *value, u32 timeout, u32 flags)
const struct type_pf_elem *d = value;
struct hbucket *n;
int i, ret = 0;
u32 key;
u32 key, multi = 0;
if (h->elements >= h->maxelem)
return -IPSET_ERR_HASH_FULL;
@ -386,12 +415,12 @@ type_pf_add(struct ip_set *set, void *value, u32 timeout, u32 flags)
key = HKEY(value, h->initval, t->htable_bits);
n = hbucket(t, key);
for (i = 0; i < n->pos; i++)
if (type_pf_data_equal(ahash_data(n, i), d)) {
if (type_pf_data_equal(ahash_data(n, i), d, &multi)) {
ret = -IPSET_ERR_EXIST;
goto out;
}
ret = type_pf_elem_add(n, value);
TUNE_AHASH_MAX(h, multi);
ret = type_pf_elem_add(n, value, AHASH_MAX(h));
if (ret != 0) {
if (ret == -EAGAIN)
type_pf_data_next(h, d);
@ -419,13 +448,13 @@ type_pf_del(struct ip_set *set, void *value, u32 timeout, u32 flags)
struct hbucket *n;
int i;
struct type_pf_elem *data;
u32 key;
u32 key, multi = 0;
key = HKEY(value, h->initval, t->htable_bits);
n = hbucket(t, key);
for (i = 0; i < n->pos; i++) {
data = ahash_data(n, i);
if (!type_pf_data_equal(data, d))
if (!type_pf_data_equal(data, d, &multi))
continue;
if (i != n->pos - 1)
/* Not last one */
@ -466,17 +495,17 @@ type_pf_test_cidrs(struct ip_set *set, struct type_pf_elem *d, u32 timeout)
struct hbucket *n;
const struct type_pf_elem *data;
int i, j = 0;
u32 key;
u32 key, multi = 0;
u8 host_mask = SET_HOST_MASK(set->family);
pr_debug("test by nets\n");
for (; j < host_mask && h->nets[j].cidr; j++) {
for (; j < host_mask && h->nets[j].cidr && !multi; j++) {
type_pf_data_netmask(d, h->nets[j].cidr);
key = HKEY(d, h->initval, t->htable_bits);
n = hbucket(t, key);
for (i = 0; i < n->pos; i++) {
data = ahash_data(n, i);
if (type_pf_data_equal(data, d))
if (type_pf_data_equal(data, d, &multi))
return 1;
}
}
@ -494,7 +523,7 @@ type_pf_test(struct ip_set *set, void *value, u32 timeout, u32 flags)
struct hbucket *n;
const struct type_pf_elem *data;
int i;
u32 key;
u32 key, multi = 0;
#ifdef IP_SET_HASH_WITH_NETS
/* If we test an IP address and not a network address,
@ -507,7 +536,7 @@ type_pf_test(struct ip_set *set, void *value, u32 timeout, u32 flags)
n = hbucket(t, key);
for (i = 0; i < n->pos; i++) {
data = ahash_data(n, i);
if (type_pf_data_equal(data, d))
if (type_pf_data_equal(data, d, &multi))
return 1;
}
return 0;
@ -664,14 +693,14 @@ type_pf_data_timeout_set(struct type_pf_elem *data, u32 timeout)
static int
type_pf_elem_tadd(struct hbucket *n, const struct type_pf_elem *value,
u32 timeout)
u8 ahash_max, u32 timeout)
{
struct type_pf_elem *data;
if (n->pos >= n->size) {
void *tmp;
if (n->size >= AHASH_MAX_SIZE)
if (n->size >= ahash_max)
/* Trigger rehashing */
return -EAGAIN;
@ -776,7 +805,7 @@ type_pf_tresize(struct ip_set *set, bool retried)
for (j = 0; j < n->pos; j++) {
data = ahash_tdata(n, j);
m = hbucket(t, HKEY(data, h->initval, htable_bits));
ret = type_pf_elem_tadd(m, data,
ret = type_pf_elem_tadd(m, data, AHASH_MAX(h),
type_pf_data_timeout(data));
if (ret < 0) {
read_unlock_bh(&set->lock);
@ -807,9 +836,9 @@ type_pf_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
const struct type_pf_elem *d = value;
struct hbucket *n;
struct type_pf_elem *data;
int ret = 0, i, j = AHASH_MAX_SIZE + 1;
int ret = 0, i, j = AHASH_MAX(h) + 1;
bool flag_exist = flags & IPSET_FLAG_EXIST;
u32 key;
u32 key, multi = 0;
if (h->elements >= h->maxelem)
/* FIXME: when set is full, we slow down here */
@ -823,18 +852,18 @@ type_pf_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
n = hbucket(t, key);
for (i = 0; i < n->pos; i++) {
data = ahash_tdata(n, i);
if (type_pf_data_equal(data, d)) {
if (type_pf_data_equal(data, d, &multi)) {
if (type_pf_data_expired(data) || flag_exist)
j = i;
else {
ret = -IPSET_ERR_EXIST;
goto out;
}
} else if (j == AHASH_MAX_SIZE + 1 &&
} else if (j == AHASH_MAX(h) + 1 &&
type_pf_data_expired(data))
j = i;
}
if (j != AHASH_MAX_SIZE + 1) {
if (j != AHASH_MAX(h) + 1) {
data = ahash_tdata(n, j);
#ifdef IP_SET_HASH_WITH_NETS
del_cidr(h, data->cidr, HOST_MASK);
@ -844,7 +873,8 @@ type_pf_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
type_pf_data_timeout_set(data, timeout);
goto out;
}
ret = type_pf_elem_tadd(n, d, timeout);
TUNE_AHASH_MAX(h, multi);
ret = type_pf_elem_tadd(n, d, AHASH_MAX(h), timeout);
if (ret != 0) {
if (ret == -EAGAIN)
type_pf_data_next(h, d);
@ -869,13 +899,13 @@ type_pf_tdel(struct ip_set *set, void *value, u32 timeout, u32 flags)
struct hbucket *n;
int i;
struct type_pf_elem *data;
u32 key;
u32 key, multi = 0;
key = HKEY(value, h->initval, t->htable_bits);
n = hbucket(t, key);
for (i = 0; i < n->pos; i++) {
data = ahash_tdata(n, i);
if (!type_pf_data_equal(data, d))
if (!type_pf_data_equal(data, d, &multi))
continue;
if (type_pf_data_expired(data))
return -IPSET_ERR_EXIST;
@ -915,16 +945,16 @@ type_pf_ttest_cidrs(struct ip_set *set, struct type_pf_elem *d, u32 timeout)
struct type_pf_elem *data;
struct hbucket *n;
int i, j = 0;
u32 key;
u32 key, multi = 0;
u8 host_mask = SET_HOST_MASK(set->family);
for (; j < host_mask && h->nets[j].cidr; j++) {
for (; j < host_mask && h->nets[j].cidr && !multi; j++) {
type_pf_data_netmask(d, h->nets[j].cidr);
key = HKEY(d, h->initval, t->htable_bits);
n = hbucket(t, key);
for (i = 0; i < n->pos; i++) {
data = ahash_tdata(n, i);
if (type_pf_data_equal(data, d))
if (type_pf_data_equal(data, d, &multi))
return !type_pf_data_expired(data);
}
}
@ -940,7 +970,7 @@ type_pf_ttest(struct ip_set *set, void *value, u32 timeout, u32 flags)
struct type_pf_elem *data, *d = value;
struct hbucket *n;
int i;
u32 key;
u32 key, multi = 0;
#ifdef IP_SET_HASH_WITH_NETS
if (d->cidr == SET_HOST_MASK(set->family))
@ -950,7 +980,7 @@ type_pf_ttest(struct ip_set *set, void *value, u32 timeout, u32 flags)
n = hbucket(t, key);
for (i = 0; i < n->pos; i++) {
data = ahash_tdata(n, i);
if (type_pf_data_equal(data, d))
if (type_pf_data_equal(data, d, &multi))
return !type_pf_data_expired(data);
}
return 0;

6
net/netfilter/ipset/ip_set_hash_ip.c
View File

@ -53,7 +53,8 @@ struct hash_ip4_telem {
static inline bool
hash_ip4_data_equal(const struct hash_ip4_elem *ip1,
const struct hash_ip4_elem *ip2)
const struct hash_ip4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip;
}
@ -225,7 +226,8 @@ struct hash_ip6_telem {
static inline bool
hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
const struct hash_ip6_elem *ip2)
const struct hash_ip6_elem *ip2,
u32 *multi)
{
return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0;
}

6
net/netfilter/ipset/ip_set_hash_ipport.c
View File

@ -60,7 +60,8 @@ struct hash_ipport4_telem {
static inline bool
hash_ipport4_data_equal(const struct hash_ipport4_elem *ip1,
const struct hash_ipport4_elem *ip2)
const struct hash_ipport4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip &&
ip1->port == ip2->port &&
@ -276,7 +277,8 @@ struct hash_ipport6_telem {
static inline bool
hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1,
const struct hash_ipport6_elem *ip2)
const struct hash_ipport6_elem *ip2,
u32 *multi)
{
return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
ip1->port == ip2->port &&

6
net/netfilter/ipset/ip_set_hash_ipportip.c
View File

@ -62,7 +62,8 @@ struct hash_ipportip4_telem {
static inline bool
hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1,
const struct hash_ipportip4_elem *ip2)
const struct hash_ipportip4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip &&
ip1->ip2 == ip2->ip2 &&
@ -286,7 +287,8 @@ struct hash_ipportip6_telem {
static inline bool
hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
const struct hash_ipportip6_elem *ip2)
const struct hash_ipportip6_elem *ip2,
u32 *multi)
{
return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
ipv6_addr_cmp(&ip1->ip2.in6, &ip2->ip2.in6) == 0 &&

6
net/netfilter/ipset/ip_set_hash_ipportnet.c
View File

@ -62,7 +62,8 @@ struct hash_ipportnet4_telem {
static inline bool
hash_ipportnet4_data_equal(const struct hash_ipportnet4_elem *ip1,
const struct hash_ipportnet4_elem *ip2)
const struct hash_ipportnet4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip &&
ip1->ip2 == ip2->ip2 &&
@ -335,7 +336,8 @@ struct hash_ipportnet6_telem {
static inline bool
hash_ipportnet6_data_equal(const struct hash_ipportnet6_elem *ip1,
const struct hash_ipportnet6_elem *ip2)
const struct hash_ipportnet6_elem *ip2,
u32 *multi)
{
return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
ipv6_addr_cmp(&ip1->ip2.in6, &ip2->ip2.in6) == 0 &&

6
net/netfilter/ipset/ip_set_hash_net.c
View File

@ -58,7 +58,8 @@ struct hash_net4_telem {
static inline bool
hash_net4_data_equal(const struct hash_net4_elem *ip1,
const struct hash_net4_elem *ip2)
const struct hash_net4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip && ip1->cidr == ip2->cidr;
}
@ -249,7 +250,8 @@ struct hash_net6_telem {
static inline bool
hash_net6_data_equal(const struct hash_net6_elem *ip1,
const struct hash_net6_elem *ip2)
const struct hash_net6_elem *ip2,
u32 *multi)
{
return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
ip1->cidr == ip2->cidr;

48
net/netfilter/ipset/ip_set_hash_netiface.c
View File

@ -99,7 +99,7 @@ iface_test(struct rb_root *root, const char **iface)
while (n) {
const char *d = iface_data(n);
int res = ifname_compare(*iface, d);
long res = ifname_compare(*iface, d);
if (res < 0)
n = n->rb_left;
@ -121,7 +121,7 @@ iface_add(struct rb_root *root, const char **iface)
while (*n) {
char *ifname = iface_data(*n);
int res = ifname_compare(*iface, ifname);
long res = ifname_compare(*iface, ifname);
p = *n;
if (res < 0)
@ -159,31 +159,42 @@ hash_netiface_same_set(const struct ip_set *a, const struct ip_set *b);
/* The type variant functions: IPv4 */
/* Member elements without timeout */
struct hash_netiface4_elem {
struct hash_netiface4_elem_hashed {
__be32 ip;
const char *iface;
u8 physdev;
u8 cidr;
u16 padding;
};
#define HKEY_DATALEN sizeof(struct hash_netiface4_elem_hashed)
/* Member elements without timeout */
struct hash_netiface4_elem {
__be32 ip;
u8 physdev;
u8 cidr;
u16 padding;
const char *iface;
};
/* Member elements with timeout support */
struct hash_netiface4_telem {
__be32 ip;
const char *iface;
u8 physdev;
u8 cidr;
u16 padding;
const char *iface;
unsigned long timeout;
};
static inline bool
hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1,
const struct hash_netiface4_elem *ip2)
const struct hash_netiface4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip &&
ip1->cidr == ip2->cidr &&
(++*multi) &&
ip1->physdev == ip2->physdev &&
ip1->iface == ip2->iface;
}
@ -257,6 +268,7 @@ hash_netiface4_data_tlist(struct sk_buff *skb,
#define IP_SET_HASH_WITH_NETS
#define IP_SET_HASH_WITH_RBTREE
#define IP_SET_HASH_WITH_MULTI
#define PF 4
#define HOST_MASK 32
@ -424,29 +436,40 @@ hash_netiface_same_set(const struct ip_set *a, const struct ip_set *b)
/* The type variant functions: IPv6 */
struct hash_netiface6_elem {
struct hash_netiface6_elem_hashed {
union nf_inet_addr ip;
const char *iface;
u8 physdev;
u8 cidr;
u16 padding;
};
struct hash_netiface6_telem {
#define HKEY_DATALEN sizeof(struct hash_netiface6_elem_hashed)
struct hash_netiface6_elem {
union nf_inet_addr ip;
const char *iface;
u8 physdev;
u8 cidr;
u16 padding;
const char *iface;
};
struct hash_netiface6_telem {
union nf_inet_addr ip;
u8 physdev;
u8 cidr;
u16 padding;
const char *iface;
unsigned long timeout;
};
static inline bool
hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1,
const struct hash_netiface6_elem *ip2)
const struct hash_netiface6_elem *ip2,
u32 *multi)
{
return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
ip1->cidr == ip2->cidr &&
(++*multi) &&
ip1->physdev == ip2->physdev &&
ip1->iface == ip2->iface;
}
@ -681,6 +704,7 @@ hash_netiface_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
h->maxelem = maxelem;
get_random_bytes(&h->initval, sizeof(h->initval));
h->timeout = IPSET_NO_TIMEOUT;
h->ahash_max = AHASH_MAX_SIZE;
hbits = htable_bits(hashsize);
h->table = ip_set_alloc(

6
net/netfilter/ipset/ip_set_hash_netport.c
View File

@ -59,7 +59,8 @@ struct hash_netport4_telem {
static inline bool
hash_netport4_data_equal(const struct hash_netport4_elem *ip1,
const struct hash_netport4_elem *ip2)
const struct hash_netport4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip &&
ip1->port == ip2->port &&
@ -300,7 +301,8 @@ struct hash_netport6_telem {
static inline bool
hash_netport6_data_equal(const struct hash_netport6_elem *ip1,
const struct hash_netport6_elem *ip2)
const struct hash_netport6_elem *ip2,
u32 *multi)
{
return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
ip1->port == ip2->port &&