/usr/src/xtables-addons-1.40/ipset-6/ip_set_ahash.h is in xtables-addons-dkms 1.40-1.
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#define _IP_SET_AHASH_H
#include <linux/rcupdate.h>
#include "jhash.h"
#include "ip_set_timeout.h"
#define CONCAT(a, b, c) a##b##c
#define TOKEN(a, b, c) CONCAT(a, b, c)
#define type_pf_next TOKEN(TYPE, PF, _elem)
/* Hashing which uses arrays to resolve clashing. The hash table is resized
* (doubled) when searching becomes too long.
* Internally jhash is used with the assumption that the size of the
* stored data is a multiple of sizeof(u32). If storage supports timeout,
* the timeout field must be the last one in the data structure - that field
* is ignored when computing the hash key.
*
* Readers and resizing
*
* Resizing can be triggered by userspace command only, and those
* are serialized by the nfnl mutex. During resizing the set is
* read-locked, so the only possible concurrent operations are
* the kernel side readers. Those must be protected by proper RCU locking.
*/
/* 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*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 {
void *value; /* the array of the values */
u8 size; /* size of the array */
u8 pos; /* position of the first free entry */
};
/* The hash table: the table size stored here in order to make resizing easy */
struct htable {
u8 htable_bits; /* size of hash table == 2^htable_bits */
struct hbucket bucket[0]; /* hashtable buckets */
};
#define hbucket(h, i) (&((h)->bucket[i]))
/* Book-keeping of the prefixes added to the set */
struct ip_set_hash_nets {
u8 cidr; /* the different cidr values in the set */
u32 nets; /* number of elements per cidr */
};
/* The generic ip_set hash structure */
struct ip_set_hash {
struct htable *table; /* the hash table */
u32 maxelem; /* max elements in the hash */
u32 elements; /* current element (vs timeout) */
u32 initval; /* random jhash init value */
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
#ifdef IP_SET_HASH_WITH_RBTREE
struct rb_root rbtree;
#endif
#ifdef IP_SET_HASH_WITH_NETS
struct ip_set_hash_nets nets[0]; /* book-keeping of prefixes */
#endif
};
/* Compute htable_bits from the user input parameter hashsize */
static u8
htable_bits(u32 hashsize)
{
/* Assume that hashsize == 2^htable_bits */
u8 bits = fls(hashsize - 1);
if (jhash_size(bits) != hashsize)
/* Round up to the first 2^n value */
bits = fls(hashsize);
return bits;
}
#ifdef IP_SET_HASH_WITH_NETS
#define SET_HOST_MASK(family) (family == AF_INET ? 32 : 128)
/* 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)
{
u8 i;
++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);
}
if (i < host_mask)
h->nets[i].cidr = cidr;
}
static void
del_cidr(struct ip_set_hash *h, u8 cidr, u8 host_mask)
{
u8 i;
--h->nets[cidr-1].nets;
pr_debug("del_cidr deleted %u: %u\n", cidr, h->nets[cidr-1].nets);
if (h->nets[cidr-1].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;
}
h->nets[i - 1].cidr = 0;
}
#endif
/* Destroy the hashtable part of the set */
static void
ahash_destroy(struct htable *t)
{
struct hbucket *n;
u32 i;
for (i = 0; i < jhash_size(t->htable_bits); i++) {
n = hbucket(t, i);
if (n->size)
/* FIXME: use slab cache */
kfree(n->value);
}
ip_set_free(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)
{
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
#endif
+ jhash_size(t->htable_bits) * sizeof(struct hbucket);
for (i = 0; i < jhash_size(t->htable_bits); i++)
memsize += t->bucket[i].size * dsize;
return memsize;
}
/* Flush a hash type of set: destroy all elements */
static void
ip_set_hash_flush(struct ip_set *set)
{
struct ip_set_hash *h = set->data;
struct htable *t = h->table;
struct hbucket *n;
u32 i;
for (i = 0; i < jhash_size(t->htable_bits); i++) {
n = hbucket(t, i);
if (n->size) {
n->size = n->pos = 0;
/* FIXME: use slab cache */
kfree(n->value);
}
}
#ifdef IP_SET_HASH_WITH_NETS
memset(h->nets, 0, sizeof(struct ip_set_hash_nets)
* SET_HOST_MASK(set->family));
#endif
h->elements = 0;
}
/* Destroy a hash type of set */
static void
ip_set_hash_destroy(struct ip_set *set)
{
struct ip_set_hash *h = set->data;
if (with_timeout(h->timeout))
del_timer_sync(&h->gc);
ahash_destroy(h->table);
#ifdef IP_SET_HASH_WITH_RBTREE
rbtree_destroy(&h->rbtree);
#endif
kfree(h);
set->data = NULL;
}
#endif /* _IP_SET_AHASH_H */
#ifndef HKEY_DATALEN
#define HKEY_DATALEN sizeof(struct type_pf_elem)
#endif
#define HKEY(data, initval, htable_bits) \
(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)
#define type_pf_data_isnull TOKEN(TYPE, PF, _data_isnull)
#define type_pf_data_copy TOKEN(TYPE, PF, _data_copy)
#define type_pf_data_zero_out TOKEN(TYPE, PF, _data_zero_out)
#define type_pf_data_netmask TOKEN(TYPE, PF, _data_netmask)
#define type_pf_data_list TOKEN(TYPE, PF, _data_list)
#define type_pf_data_tlist TOKEN(TYPE, PF, _data_tlist)
#define type_pf_data_next TOKEN(TYPE, PF, _data_next)
#define type_pf_elem TOKEN(TYPE, PF, _elem)
#define type_pf_telem TOKEN(TYPE, PF, _telem)
#define type_pf_data_timeout TOKEN(TYPE, PF, _data_timeout)
#define type_pf_data_expired TOKEN(TYPE, PF, _data_expired)
#define type_pf_data_timeout_set TOKEN(TYPE, PF, _data_timeout_set)
#define type_pf_elem_add TOKEN(TYPE, PF, _elem_add)
#define type_pf_add TOKEN(TYPE, PF, _add)
#define type_pf_del TOKEN(TYPE, PF, _del)
#define type_pf_test_cidrs TOKEN(TYPE, PF, _test_cidrs)
#define type_pf_test TOKEN(TYPE, PF, _test)
#define type_pf_elem_tadd TOKEN(TYPE, PF, _elem_tadd)
#define type_pf_del_telem TOKEN(TYPE, PF, _ahash_del_telem)
#define type_pf_expire TOKEN(TYPE, PF, _expire)
#define type_pf_tadd TOKEN(TYPE, PF, _tadd)
#define type_pf_tdel TOKEN(TYPE, PF, _tdel)
#define type_pf_ttest_cidrs TOKEN(TYPE, PF, _ahash_ttest_cidrs)
#define type_pf_ttest TOKEN(TYPE, PF, _ahash_ttest)
#define type_pf_resize TOKEN(TYPE, PF, _resize)
#define type_pf_tresize TOKEN(TYPE, PF, _tresize)
#define type_pf_flush ip_set_hash_flush
#define type_pf_destroy ip_set_hash_destroy
#define type_pf_head TOKEN(TYPE, PF, _head)
#define type_pf_list TOKEN(TYPE, PF, _list)
#define type_pf_tlist TOKEN(TYPE, PF, _tlist)
#define type_pf_same_set TOKEN(TYPE, PF, _same_set)
#define type_pf_kadt TOKEN(TYPE, PF, _kadt)
#define type_pf_uadt TOKEN(TYPE, PF, _uadt)
#define type_pf_gc TOKEN(TYPE, PF, _gc)
#define type_pf_gc_init TOKEN(TYPE, PF, _gc_init)
#define type_pf_variant TOKEN(TYPE, PF, _variant)
#define type_pf_tvariant TOKEN(TYPE, PF, _tvariant)
/* Flavour without timeout */
/* Get the ith element from the array block n */
#define ahash_data(n, i) \
((struct type_pf_elem *)((n)->value) + (i))
/* 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,
u8 ahash_max)
{
if (n->pos >= n->size) {
void *tmp;
if (n->size >= ahash_max)
/* Trigger rehashing */
return -EAGAIN;
tmp = kzalloc((n->size + AHASH_INIT_SIZE)
* sizeof(struct type_pf_elem),
GFP_ATOMIC);
if (!tmp)
return -ENOMEM;
if (n->size) {
memcpy(tmp, n->value,
sizeof(struct type_pf_elem) * n->size);
kfree(n->value);
}
n->value = tmp;
n->size += AHASH_INIT_SIZE;
}
type_pf_data_copy(ahash_data(n, n->pos++), value);
return 0;
}
/* Resize a hash: create a new hash table with doubling the hashsize
* and inserting the elements to it. Repeat until we succeed or
* fail due to memory pressures. */
static int
type_pf_resize(struct ip_set *set, bool retried)
{
struct ip_set_hash *h = set->data;
struct htable *t, *orig = h->table;
u8 htable_bits = orig->htable_bits;
const struct type_pf_elem *data;
struct hbucket *n, *m;
u32 i, j;
int ret;
retry:
ret = 0;
htable_bits++;
pr_debug("attempt to resize set %s from %u to %u, t %p\n",
set->name, orig->htable_bits, htable_bits, orig);
if (!htable_bits)
/* In case we have plenty of memory :-) */
return -IPSET_ERR_HASH_FULL;
t = ip_set_alloc(sizeof(*t)
+ jhash_size(htable_bits) * sizeof(struct hbucket));
if (!t)
return -ENOMEM;
t->htable_bits = htable_bits;
read_lock_bh(&set->lock);
for (i = 0; i < jhash_size(orig->htable_bits); i++) {
n = hbucket(orig, i);
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, AHASH_MAX(h));
if (ret < 0) {
read_unlock_bh(&set->lock);
ahash_destroy(t);
if (ret == -EAGAIN)
goto retry;
return ret;
}
}
}
rcu_assign_pointer(h->table, t);
read_unlock_bh(&set->lock);
/* Give time to other readers of the set */
synchronize_rcu_bh();
pr_debug("set %s resized from %u (%p) to %u (%p)\n", set->name,
orig->htable_bits, orig, t->htable_bits, t);
ahash_destroy(orig);
return 0;
}
static inline void
type_pf_data_next(struct ip_set_hash *h, const struct type_pf_elem *d);
/* Add an element to a hash and update the internal counters when succeeded,
* otherwise report the proper error code. */
static int
type_pf_add(struct ip_set *set, void *value, u32 timeout, u32 flags)
{
struct ip_set_hash *h = set->data;
struct htable *t;
const struct type_pf_elem *d = value;
struct hbucket *n;
int i, ret = 0;
u32 key, multi = 0;
if (h->elements >= h->maxelem)
return -IPSET_ERR_HASH_FULL;
rcu_read_lock_bh();
t = rcu_dereference_bh(h->table);
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, &multi)) {
ret = -IPSET_ERR_EXIST;
goto out;
}
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);
goto out;
}
#ifdef IP_SET_HASH_WITH_NETS
add_cidr(h, d->cidr, HOST_MASK);
#endif
h->elements++;
out:
rcu_read_unlock_bh();
return ret;
}
/* Delete an element from the hash: swap it with the last element
* and free up space if possible.
*/
static int
type_pf_del(struct ip_set *set, void *value, u32 timeout, u32 flags)
{
struct ip_set_hash *h = set->data;
struct htable *t = h->table;
const struct type_pf_elem *d = value;
struct hbucket *n;
int i;
struct type_pf_elem *data;
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, &multi))
continue;
if (i != n->pos - 1)
/* Not last one */
type_pf_data_copy(data, ahash_data(n, n->pos - 1));
n->pos--;
h->elements--;
#ifdef IP_SET_HASH_WITH_NETS
del_cidr(h, d->cidr, HOST_MASK);
#endif
if (n->pos + AHASH_INIT_SIZE < n->size) {
void *tmp = kzalloc((n->size - AHASH_INIT_SIZE)
* sizeof(struct type_pf_elem),
GFP_ATOMIC);
if (!tmp)
return 0;
n->size -= AHASH_INIT_SIZE;
memcpy(tmp, n->value,
n->size * sizeof(struct type_pf_elem));
kfree(n->value);
n->value = tmp;
}
return 0;
}
return -IPSET_ERR_EXIST;
}
#ifdef IP_SET_HASH_WITH_NETS
/* Special test function which takes into account the different network
* sizes added to the set */
static int
type_pf_test_cidrs(struct ip_set *set, struct type_pf_elem *d, u32 timeout)
{
struct ip_set_hash *h = set->data;
struct htable *t = h->table;
struct hbucket *n;
const struct type_pf_elem *data;
int i, j = 0;
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 && !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, &multi))
return 1;
}
}
return 0;
}
#endif
/* Test whether the element is added to the set */
static int
type_pf_test(struct ip_set *set, void *value, u32 timeout, u32 flags)
{
struct ip_set_hash *h = set->data;
struct htable *t = h->table;
struct type_pf_elem *d = value;
struct hbucket *n;
const struct type_pf_elem *data;
int i;
u32 key, multi = 0;
#ifdef IP_SET_HASH_WITH_NETS
/* If we test an IP address and not a network address,
* try all possible network sizes */
if (d->cidr == SET_HOST_MASK(set->family))
return type_pf_test_cidrs(set, d, timeout);
#endif
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, &multi))
return 1;
}
return 0;
}
/* Reply a HEADER request: fill out the header part of the set */
static int
type_pf_head(struct ip_set *set, struct sk_buff *skb)
{
const struct ip_set_hash *h = set->data;
struct nlattr *nested;
size_t memsize;
read_lock_bh(&set->lock);
memsize = ahash_memsize(h, with_timeout(h->timeout)
? sizeof(struct type_pf_telem)
: sizeof(struct type_pf_elem),
set->family == AF_INET ? 32 : 128);
read_unlock_bh(&set->lock);
nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
if (!nested)
goto nla_put_failure;
NLA_PUT_NET32(skb, IPSET_ATTR_HASHSIZE,
htonl(jhash_size(h->table->htable_bits)));
NLA_PUT_NET32(skb, IPSET_ATTR_MAXELEM, htonl(h->maxelem));
#ifdef IP_SET_HASH_WITH_NETMASK
if (h->netmask != HOST_MASK)
NLA_PUT_U8(skb, IPSET_ATTR_NETMASK, h->netmask);
#endif
NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1));
NLA_PUT_NET32(skb, IPSET_ATTR_MEMSIZE, htonl(memsize));
if (with_timeout(h->timeout))
NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, htonl(h->timeout));
ipset_nest_end(skb, nested);
return 0;
nla_put_failure:
return -EMSGSIZE;
}
/* Reply a LIST/SAVE request: dump the elements of the specified set */
static int
type_pf_list(const struct ip_set *set,
struct sk_buff *skb, struct netlink_callback *cb)
{
const struct ip_set_hash *h = set->data;
const struct htable *t = h->table;
struct nlattr *atd, *nested;
const struct hbucket *n;
const struct type_pf_elem *data;
u32 first = cb->args[2];
/* We assume that one hash bucket fills into one page */
void *incomplete;
int i;
atd = ipset_nest_start(skb, IPSET_ATTR_ADT);
if (!atd)
return -EMSGSIZE;
pr_debug("list hash set %s\n", set->name);
for (; cb->args[2] < jhash_size(t->htable_bits); cb->args[2]++) {
incomplete = skb_tail_pointer(skb);
n = hbucket(t, cb->args[2]);
pr_debug("cb->args[2]: %lu, t %p n %p\n", cb->args[2], t, n);
for (i = 0; i < n->pos; i++) {
data = ahash_data(n, i);
pr_debug("list hash %lu hbucket %p i %u, data %p\n",
cb->args[2], n, i, data);
nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
if (!nested) {
if (cb->args[2] == first) {
nla_nest_cancel(skb, atd);
return -EMSGSIZE;
} else
goto nla_put_failure;
}
if (type_pf_data_list(skb, data))
goto nla_put_failure;
ipset_nest_end(skb, nested);
}
}
ipset_nest_end(skb, atd);
/* Set listing finished */
cb->args[2] = 0;
return 0;
nla_put_failure:
nlmsg_trim(skb, incomplete);
ipset_nest_end(skb, atd);
if (unlikely(first == cb->args[2])) {
pr_warning("Can't list set %s: one bucket does not fit into "
"a message. Please report it!\n", set->name);
cb->args[2] = 0;
return -EMSGSIZE;
}
return 0;
}
static int
type_pf_kadt(struct ip_set *set, const struct sk_buff * skb,
const struct xt_action_param *par,
enum ipset_adt adt, const struct ip_set_adt_opt *opt);
static int
type_pf_uadt(struct ip_set *set, struct nlattr *tb[],
enum ipset_adt adt, u32 *lineno, u32 flags, bool retried);
static const struct ip_set_type_variant type_pf_variant = {
.kadt = type_pf_kadt,
.uadt = type_pf_uadt,
.adt = {
[IPSET_ADD] = type_pf_add,
[IPSET_DEL] = type_pf_del,
[IPSET_TEST] = type_pf_test,
},
.destroy = type_pf_destroy,
.flush = type_pf_flush,
.head = type_pf_head,
.list = type_pf_list,
.resize = type_pf_resize,
.same_set = type_pf_same_set,
};
/* Flavour with timeout support */
#define ahash_tdata(n, i) \
(struct type_pf_elem *)((struct type_pf_telem *)((n)->value) + (i))
static inline u32
type_pf_data_timeout(const struct type_pf_elem *data)
{
const struct type_pf_telem *tdata =
(const struct type_pf_telem *) data;
return tdata->timeout;
}
static inline bool
type_pf_data_expired(const struct type_pf_elem *data)
{
const struct type_pf_telem *tdata =
(const struct type_pf_telem *) data;
return ip_set_timeout_expired(tdata->timeout);
}
static inline void
type_pf_data_timeout_set(struct type_pf_elem *data, u32 timeout)
{
struct type_pf_telem *tdata = (struct type_pf_telem *) data;
tdata->timeout = ip_set_timeout_set(timeout);
}
static int
type_pf_elem_tadd(struct hbucket *n, const struct type_pf_elem *value,
u8 ahash_max, u32 timeout)
{
struct type_pf_elem *data;
if (n->pos >= n->size) {
void *tmp;
if (n->size >= ahash_max)
/* Trigger rehashing */
return -EAGAIN;
tmp = kzalloc((n->size + AHASH_INIT_SIZE)
* sizeof(struct type_pf_telem),
GFP_ATOMIC);
if (!tmp)
return -ENOMEM;
if (n->size) {
memcpy(tmp, n->value,
sizeof(struct type_pf_telem) * n->size);
kfree(n->value);
}
n->value = tmp;
n->size += AHASH_INIT_SIZE;
}
data = ahash_tdata(n, n->pos++);
type_pf_data_copy(data, value);
type_pf_data_timeout_set(data, timeout);
return 0;
}
/* Delete expired elements from the hashtable */
static void
type_pf_expire(struct ip_set_hash *h)
{
struct htable *t = h->table;
struct hbucket *n;
struct type_pf_elem *data;
u32 i;
int j;
for (i = 0; i < jhash_size(t->htable_bits); i++) {
n = hbucket(t, i);
for (j = 0; j < n->pos; j++) {
data = ahash_tdata(n, j);
if (type_pf_data_expired(data)) {
pr_debug("expired %u/%u\n", i, j);
#ifdef IP_SET_HASH_WITH_NETS
del_cidr(h, data->cidr, HOST_MASK);
#endif
if (j != n->pos - 1)
/* Not last one */
type_pf_data_copy(data,
ahash_tdata(n, n->pos - 1));
n->pos--;
h->elements--;
}
}
if (n->pos + AHASH_INIT_SIZE < n->size) {
void *tmp = kzalloc((n->size - AHASH_INIT_SIZE)
* sizeof(struct type_pf_telem),
GFP_ATOMIC);
if (!tmp)
/* Still try to delete expired elements */
continue;
n->size -= AHASH_INIT_SIZE;
memcpy(tmp, n->value,
n->size * sizeof(struct type_pf_telem));
kfree(n->value);
n->value = tmp;
}
}
}
static int
type_pf_tresize(struct ip_set *set, bool retried)
{
struct ip_set_hash *h = set->data;
struct htable *t, *orig = h->table;
u8 htable_bits = orig->htable_bits;
const struct type_pf_elem *data;
struct hbucket *n, *m;
u32 i, j;
int ret;
/* Try to cleanup once */
if (!retried) {
i = h->elements;
write_lock_bh(&set->lock);
type_pf_expire(set->data);
write_unlock_bh(&set->lock);
if (h->elements < i)
return 0;
}
retry:
ret = 0;
htable_bits++;
if (!htable_bits)
/* In case we have plenty of memory :-) */
return -IPSET_ERR_HASH_FULL;
t = ip_set_alloc(sizeof(*t)
+ jhash_size(htable_bits) * sizeof(struct hbucket));
if (!t)
return -ENOMEM;
t->htable_bits = htable_bits;
read_lock_bh(&set->lock);
for (i = 0; i < jhash_size(orig->htable_bits); i++) {
n = hbucket(orig, i);
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, AHASH_MAX(h),
type_pf_data_timeout(data));
if (ret < 0) {
read_unlock_bh(&set->lock);
ahash_destroy(t);
if (ret == -EAGAIN)
goto retry;
return ret;
}
}
}
rcu_assign_pointer(h->table, t);
read_unlock_bh(&set->lock);
/* Give time to other readers of the set */
synchronize_rcu_bh();
ahash_destroy(orig);
return 0;
}
static int
type_pf_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
{
struct ip_set_hash *h = set->data;
struct htable *t = h->table;
const struct type_pf_elem *d = value;
struct hbucket *n;
struct type_pf_elem *data;
int ret = 0, i, j = AHASH_MAX(h) + 1;
bool flag_exist = flags & IPSET_FLAG_EXIST;
u32 key, multi = 0;
if (h->elements >= h->maxelem)
/* FIXME: when set is full, we slow down here */
type_pf_expire(h);
if (h->elements >= h->maxelem)
return -IPSET_ERR_HASH_FULL;
rcu_read_lock_bh();
t = rcu_dereference_bh(h->table);
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, &multi)) {
if (type_pf_data_expired(data) || flag_exist)
j = i;
else {
ret = -IPSET_ERR_EXIST;
goto out;
}
} else if (j == AHASH_MAX(h) + 1 &&
type_pf_data_expired(data))
j = i;
}
if (j != AHASH_MAX(h) + 1) {
data = ahash_tdata(n, j);
#ifdef IP_SET_HASH_WITH_NETS
del_cidr(h, data->cidr, HOST_MASK);
add_cidr(h, d->cidr, HOST_MASK);
#endif
type_pf_data_copy(data, d);
type_pf_data_timeout_set(data, timeout);
goto out;
}
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);
goto out;
}
#ifdef IP_SET_HASH_WITH_NETS
add_cidr(h, d->cidr, HOST_MASK);
#endif
h->elements++;
out:
rcu_read_unlock_bh();
return ret;
}
static int
type_pf_tdel(struct ip_set *set, void *value, u32 timeout, u32 flags)
{
struct ip_set_hash *h = set->data;
struct htable *t = h->table;
const struct type_pf_elem *d = value;
struct hbucket *n;
int i;
struct type_pf_elem *data;
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, &multi))
continue;
if (type_pf_data_expired(data))
return -IPSET_ERR_EXIST;
if (i != n->pos - 1)
/* Not last one */
type_pf_data_copy(data, ahash_tdata(n, n->pos - 1));
n->pos--;
h->elements--;
#ifdef IP_SET_HASH_WITH_NETS
del_cidr(h, d->cidr, HOST_MASK);
#endif
if (n->pos + AHASH_INIT_SIZE < n->size) {
void *tmp = kzalloc((n->size - AHASH_INIT_SIZE)
* sizeof(struct type_pf_telem),
GFP_ATOMIC);
if (!tmp)
return 0;
n->size -= AHASH_INIT_SIZE;
memcpy(tmp, n->value,
n->size * sizeof(struct type_pf_telem));
kfree(n->value);
n->value = tmp;
}
return 0;
}
return -IPSET_ERR_EXIST;
}
#ifdef IP_SET_HASH_WITH_NETS
static int
type_pf_ttest_cidrs(struct ip_set *set, struct type_pf_elem *d, u32 timeout)
{
struct ip_set_hash *h = set->data;
struct htable *t = h->table;
struct type_pf_elem *data;
struct hbucket *n;
int i, j = 0;
u32 key, multi = 0;
u8 host_mask = SET_HOST_MASK(set->family);
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, &multi))
return !type_pf_data_expired(data);
}
}
return 0;
}
#endif
static int
type_pf_ttest(struct ip_set *set, void *value, u32 timeout, u32 flags)
{
struct ip_set_hash *h = set->data;
struct htable *t = h->table;
struct type_pf_elem *data, *d = value;
struct hbucket *n;
int i;
u32 key, multi = 0;
#ifdef IP_SET_HASH_WITH_NETS
if (d->cidr == SET_HOST_MASK(set->family))
return type_pf_ttest_cidrs(set, d, timeout);
#endif
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, &multi))
return !type_pf_data_expired(data);
}
return 0;
}
static int
type_pf_tlist(const struct ip_set *set,
struct sk_buff *skb, struct netlink_callback *cb)
{
const struct ip_set_hash *h = set->data;
const struct htable *t = h->table;
struct nlattr *atd, *nested;
const struct hbucket *n;
const struct type_pf_elem *data;
u32 first = cb->args[2];
/* We assume that one hash bucket fills into one page */
void *incomplete;
int i;
atd = ipset_nest_start(skb, IPSET_ATTR_ADT);
if (!atd)
return -EMSGSIZE;
for (; cb->args[2] < jhash_size(t->htable_bits); cb->args[2]++) {
incomplete = skb_tail_pointer(skb);
n = hbucket(t, cb->args[2]);
for (i = 0; i < n->pos; i++) {
data = ahash_tdata(n, i);
pr_debug("list %p %u\n", n, i);
if (type_pf_data_expired(data))
continue;
pr_debug("do list %p %u\n", n, i);
nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
if (!nested) {
if (cb->args[2] == first) {
nla_nest_cancel(skb, atd);
return -EMSGSIZE;
} else
goto nla_put_failure;
}
if (type_pf_data_tlist(skb, data))
goto nla_put_failure;
ipset_nest_end(skb, nested);
}
}
ipset_nest_end(skb, atd);
/* Set listing finished */
cb->args[2] = 0;
return 0;
nla_put_failure:
nlmsg_trim(skb, incomplete);
ipset_nest_end(skb, atd);
if (unlikely(first == cb->args[2])) {
pr_warning("Can't list set %s: one bucket does not fit into "
"a message. Please report it!\n", set->name);
cb->args[2] = 0;
return -EMSGSIZE;
}
return 0;
}
static const struct ip_set_type_variant type_pf_tvariant = {
.kadt = type_pf_kadt,
.uadt = type_pf_uadt,
.adt = {
[IPSET_ADD] = type_pf_tadd,
[IPSET_DEL] = type_pf_tdel,
[IPSET_TEST] = type_pf_ttest,
},
.destroy = type_pf_destroy,
.flush = type_pf_flush,
.head = type_pf_head,
.list = type_pf_tlist,
.resize = type_pf_tresize,
.same_set = type_pf_same_set,
};
static void
type_pf_gc(unsigned long ul_set)
{
struct ip_set *set = (struct ip_set *) ul_set;
struct ip_set_hash *h = set->data;
pr_debug("called\n");
write_lock_bh(&set->lock);
type_pf_expire(h);
write_unlock_bh(&set->lock);
h->gc.expires = jiffies + IPSET_GC_PERIOD(h->timeout) * HZ;
add_timer(&h->gc);
}
static void
type_pf_gc_init(struct ip_set *set)
{
struct ip_set_hash *h = set->data;
init_timer(&h->gc);
h->gc.data = (unsigned long) set;
h->gc.function = type_pf_gc;
h->gc.expires = jiffies + IPSET_GC_PERIOD(h->timeout) * HZ;
add_timer(&h->gc);
pr_debug("gc initialized, run in every %u\n",
IPSET_GC_PERIOD(h->timeout));
}
#undef HKEY_DATALEN
#undef HKEY
#undef type_pf_data_equal
#undef type_pf_data_isnull
#undef type_pf_data_copy
#undef type_pf_data_zero_out
#undef type_pf_data_list
#undef type_pf_data_tlist
#undef type_pf_elem
#undef type_pf_telem
#undef type_pf_data_timeout
#undef type_pf_data_expired
#undef type_pf_data_netmask
#undef type_pf_data_timeout_set
#undef type_pf_elem_add
#undef type_pf_add
#undef type_pf_del
#undef type_pf_test_cidrs
#undef type_pf_test
#undef type_pf_elem_tadd
#undef type_pf_expire
#undef type_pf_tadd
#undef type_pf_tdel
#undef type_pf_ttest_cidrs
#undef type_pf_ttest
#undef type_pf_resize
#undef type_pf_tresize
#undef type_pf_flush
#undef type_pf_destroy
#undef type_pf_head
#undef type_pf_list
#undef type_pf_tlist
#undef type_pf_same_set
#undef type_pf_kadt
#undef type_pf_uadt
#undef type_pf_gc
#undef type_pf_gc_init
#undef type_pf_variant
#undef type_pf_tvariant
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