+++ /dev/null
-#ifndef _IP_SET_AHASH_H
-#define _IP_SET_AHASH_H
-
-#include <linux/rcupdate.h>
-#include <linux/jhash.h>
-#include <linux/netfilter/ipset/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
-};
-
-static size_t
-htable_size(u8 hbits)
-{
- size_t hsize;
-
- /* We must fit both into u32 in jhash and size_t */
- if (hbits > 31)
- return 0;
- hsize = jhash_size(hbits);
- if ((((size_t)-1) - sizeof(struct htable))/sizeof(struct hbucket)
- < hsize)
- return 0;
-
- return hsize * sizeof(struct hbucket) + sizeof(struct htable);
-}
-
-/* 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
-#ifdef IP_SET_HASH_WITH_NETS_PACKED
-/* When cidr is packed with nomatch, cidr - 1 is stored in the entry */
-#define CIDR(cidr) (cidr + 1)
-#else
-#define CIDR(cidr) (cidr)
-#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 nets_length)
-{
- 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++) {
- 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 (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 nets_length)
-{
- u8 i, j;
-
- for (i = 0; i < nets_length - 1 && h->nets[i].cidr != cidr; i++)
- ;
- h->nets[i].nets--;
-
- if (h->nets[i].nets != 0)
- return;
-
- 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;
- }
-}
-#else
-#define NETS_LENGTH(family) 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 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) * nets_length
-#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)
- * NETS_LENGTH(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))
-
-/* 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_data_flags TOKEN(TYPE, PF, _data_flags)
-#define type_pf_data_reset_flags TOKEN(TYPE, PF, _data_reset_flags)
-#ifdef IP_SET_HASH_WITH_NETS
-#define type_pf_data_match TOKEN(TYPE, PF, _data_match)
-#else
-#define type_pf_data_match(d) 1
-#endif
-
-#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, u32 cadt_flags)
-{
- 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_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;
- }
- data = ahash_data(n, n->pos++);
- type_pf_data_copy(data, value);
-#ifdef IP_SET_HASH_WITH_NETS
- /* Resizing won't overwrite stored flags */
- if (cadt_flags)
- type_pf_data_flags(data, cadt_flags);
-#endif
- 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;
- struct type_pf_elem *data;
- struct hbucket *n, *m;
- u32 i, j, flags = 0;
- 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 :-) */
- pr_warning("Cannot increase the hashsize of set %s further\n",
- set->name);
- 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);
-#ifdef IP_SET_HASH_WITH_NETS
- flags = 0;
- type_pf_data_reset_flags(data, &flags);
-#endif
- m = hbucket(t, HKEY(data, h->initval, htable_bits));
- ret = type_pf_elem_add(m, data, AHASH_MAX(h), flags);
- if (ret < 0) {
-#ifdef IP_SET_HASH_WITH_NETS
- type_pf_data_flags(data, flags);
-#endif
- 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;
- u32 cadt_flags = flags >> 16;
-
- if (h->elements >= h->maxelem) {
- if (net_ratelimit())
- pr_warning("Set %s is full, maxelem %u reached\n",
- set->name, 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)) {
-#ifdef IP_SET_HASH_WITH_NETS
- if (flags & IPSET_FLAG_EXIST)
- /* Support overwriting just the flags */
- type_pf_data_flags(ahash_data(n, i),
- cadt_flags);
-#endif
- ret = -IPSET_ERR_EXIST;
- goto out;
- }
- TUNE_AHASH_MAX(h, multi);
- ret = type_pf_elem_add(n, value, AHASH_MAX(h), cadt_flags);
- if (ret != 0) {
- if (ret == -EAGAIN)
- type_pf_data_next(h, d);
- goto out;
- }
-
-#ifdef IP_SET_HASH_WITH_NETS
- add_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
-#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, CIDR(d->cidr), NETS_LENGTH(set->family));
-#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 nets_length = NETS_LENGTH(set->family);
-
- pr_debug("test by nets\n");
- 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);
- for (i = 0; i < n->pos; i++) {
- data = ahash_data(n, i);
- if (type_pf_data_equal(data, d, &multi))
- return type_pf_data_match(data);
- }
- }
- 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 (CIDR(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 type_pf_data_match(data);
- }
- 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),
- NETS_LENGTH(set->family));
- read_unlock_bh(&set->lock);
-
- nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
- if (!nested)
- goto nla_put_failure;
- if (nla_put_net32(skb, IPSET_ATTR_HASHSIZE,
- htonl(jhash_size(h->table->htable_bits))) ||
- nla_put_net32(skb, IPSET_ATTR_MAXELEM, htonl(h->maxelem)))
- goto nla_put_failure;
-#ifdef IP_SET_HASH_WITH_NETMASK
- if (h->netmask != HOST_MASK &&
- nla_put_u8(skb, IPSET_ATTR_NETMASK, h->netmask))
- goto nla_put_failure;
-#endif
- if (nla_put_net32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1)) ||
- nla_put_net32(skb, IPSET_ATTR_MEMSIZE, htonl(memsize)) ||
- (with_timeout(h->timeout) &&
- nla_put_net32(skb, IPSET_ATTR_TIMEOUT, htonl(h->timeout))))
- goto nla_put_failure;
- 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 cadt_flags, 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);
-#ifdef IP_SET_HASH_WITH_NETS
- /* Resizing won't overwrite stored flags */
- if (cadt_flags)
- type_pf_data_flags(data, cadt_flags);
-#endif
- return 0;
-}
-
-/* Delete expired elements from the hashtable */
-static void
-type_pf_expire(struct ip_set_hash *h, u8 nets_length)
-{
- 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, CIDR(data->cidr), nets_length);
-#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;
- struct type_pf_elem *data;
- struct hbucket *n, *m;
- u32 i, j, flags = 0;
- int ret;
-
- /* Try to cleanup once */
- if (!retried) {
- i = h->elements;
- write_lock_bh(&set->lock);
- type_pf_expire(set->data, NETS_LENGTH(set->family));
- write_unlock_bh(&set->lock);
- if (h->elements < i)
- return 0;
- }
-
-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 :-) */
- pr_warning("Cannot increase the hashsize of set %s further\n",
- set->name);
- 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);
-#ifdef IP_SET_HASH_WITH_NETS
- flags = 0;
- type_pf_data_reset_flags(data, &flags);
-#endif
- m = hbucket(t, HKEY(data, h->initval, htable_bits));
- ret = type_pf_elem_tadd(m, data, AHASH_MAX(h), flags,
- ip_set_timeout_get(type_pf_data_timeout(data)));
- if (ret < 0) {
-#ifdef IP_SET_HASH_WITH_NETS
- type_pf_data_flags(data, flags);
-#endif
- 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;
- u32 cadt_flags = flags >> 16;
-
- if (h->elements >= h->maxelem)
- /* FIXME: when set is full, we slow down here */
- 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",
- set->name, 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)
- /* Just timeout value may be updated */
- 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, 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);
-#ifdef IP_SET_HASH_WITH_NETS
- type_pf_data_flags(data, cadt_flags);
-#endif
- goto out;
- }
- TUNE_AHASH_MAX(h, multi);
- ret = type_pf_elem_tadd(n, d, AHASH_MAX(h), cadt_flags, timeout);
- if (ret != 0) {
- if (ret == -EAGAIN)
- type_pf_data_next(h, d);
- goto out;
- }
-
-#ifdef IP_SET_HASH_WITH_NETS
- add_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family));
-#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, CIDR(d->cidr), NETS_LENGTH(set->family));
-#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 nets_length = NETS_LENGTH(set->family);
-
- 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);
- for (i = 0; i < n->pos; i++) {
- data = ahash_tdata(n, i);
-#ifdef IP_SET_HASH_WITH_MULTI
- if (type_pf_data_equal(data, d, &multi)) {
- if (!type_pf_data_expired(data))
- return type_pf_data_match(data);
- multi = 0;
- }
-#else
- if (type_pf_data_equal(data, d, &multi) &&
- !type_pf_data_expired(data))
- return type_pf_data_match(data);
-#endif
- }
- }
- 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 (CIDR(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) &&
- !type_pf_data_expired(data))
- return type_pf_data_match(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, NETS_LENGTH(set->family));
- 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_netmask
-#undef type_pf_data_list
-#undef type_pf_data_tlist
-#undef type_pf_data_next
-#undef type_pf_data_flags
-#undef type_pf_data_reset_flags
-#undef type_pf_data_match
-
-#undef type_pf_elem
-#undef type_pf_telem
-#undef type_pf_data_timeout
-#undef type_pf_data_expired
-#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_del_telem
-#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
--- /dev/null
+/* Copyright (C) 2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _IP_SET_HASH_GEN_H
+#define _IP_SET_HASH_GEN_H
+
+#include <linux/rcupdate.h>
+#include <linux/jhash.h>
+#include <linux/netfilter/ipset/ip_set_timeout.h>
+#ifndef rcu_dereference_bh
+#define rcu_dereference_bh(p) rcu_dereference(p)
+#endif
+
+#define CONCAT(a, b) a##b
+#define TOKEN(a, b) CONCAT(a, b)
+
+/* 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 net_prefixes {
+ u8 cidr; /* the different cidr values in the set */
+ u32 nets; /* number of elements per cidr */
+};
+
+/* Compute the hash table size */
+static size_t
+htable_size(u8 hbits)
+{
+ size_t hsize;
+
+ /* We must fit both into u32 in jhash and size_t */
+ if (hbits > 31)
+ return 0;
+ hsize = jhash_size(hbits);
+ if ((((size_t)-1) - sizeof(struct htable))/sizeof(struct hbucket)
+ < hsize)
+ return 0;
+
+ return hsize * sizeof(struct hbucket) + sizeof(struct htable);
+}
+
+/* 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;
+}
+
+/* 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);
+}
+
+static int
+hbucket_elem_add(struct hbucket *n, u8 ahash_max, size_t dsize)
+{
+ if (n->pos >= n->size) {
+ void *tmp;
+
+ if (n->size >= ahash_max)
+ /* Trigger rehashing */
+ return -EAGAIN;
+
+ tmp = kzalloc((n->size + AHASH_INIT_SIZE) * dsize,
+ GFP_ATOMIC);
+ if (!tmp)
+ return -ENOMEM;
+ if (n->size) {
+ memcpy(tmp, n->value, n->size * dsize);
+ kfree(n->value);
+ }
+ n->value = tmp;
+ n->size += AHASH_INIT_SIZE;
+ }
+ return 0;
+}
+
+#ifdef IP_SET_HASH_WITH_NETS
+#ifdef IP_SET_HASH_WITH_NETS_PACKED
+/* When cidr is packed with nomatch, cidr - 1 is stored in the entry */
+#define CIDR(cidr) (cidr + 1)
+#else
+#define CIDR(cidr) (cidr)
+#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
+
+#else
+#define NETS_LENGTH(family) 0
+#endif /* IP_SET_HASH_WITH_NETS */
+
+#define ext_timeout(e, h) \
+(unsigned long *)(((void *)(e)) + (h)->offset[IPSET_OFFSET_TIMEOUT])
+
+#endif /* _IP_SET_HASH_GEN_H */
+
+/* Family dependent templates */
+
+#undef ahash_data
+#undef mtype_data_equal
+#undef mtype_do_data_match
+#undef mtype_data_set_flags
+#undef mtype_data_reset_flags
+#undef mtype_data_netmask
+#undef mtype_data_list
+#undef mtype_data_next
+#undef mtype_elem
+
+#undef mtype_add_cidr
+#undef mtype_del_cidr
+#undef mtype_ahash_memsize
+#undef mtype_flush
+#undef mtype_destroy
+#undef mtype_gc_init
+#undef mtype_same_set
+#undef mtype_kadt
+#undef mtype_uadt
+#undef mtype
+
+#undef mtype_add
+#undef mtype_del
+#undef mtype_test_cidrs
+#undef mtype_test
+#undef mtype_expire
+#undef mtype_resize
+#undef mtype_head
+#undef mtype_list
+#undef mtype_gc
+#undef mtype_gc_init
+#undef mtype_variant
+#undef mtype_data_match
+
+#undef HKEY
+
+#define mtype_data_equal TOKEN(MTYPE, _data_equal)
+#ifdef IP_SET_HASH_WITH_NETS
+#define mtype_do_data_match TOKEN(MTYPE, _do_data_match)
+#else
+#define mtype_do_data_match(d) 1
+#endif
+#define mtype_data_set_flags TOKEN(MTYPE, _data_set_flags)
+#define mtype_data_reset_flags TOKEN(MTYPE, _data_reset_flags)
+#define mtype_data_netmask TOKEN(MTYPE, _data_netmask)
+#define mtype_data_list TOKEN(MTYPE, _data_list)
+#define mtype_data_next TOKEN(MTYPE, _data_next)
+#define mtype_elem TOKEN(MTYPE, _elem)
+#define mtype_add_cidr TOKEN(MTYPE, _add_cidr)
+#define mtype_del_cidr TOKEN(MTYPE, _del_cidr)
+#define mtype_ahash_memsize TOKEN(MTYPE, _ahash_memsize)
+#define mtype_flush TOKEN(MTYPE, _flush)
+#define mtype_destroy TOKEN(MTYPE, _destroy)
+#define mtype_gc_init TOKEN(MTYPE, _gc_init)
+#define mtype_same_set TOKEN(MTYPE, _same_set)
+#define mtype_kadt TOKEN(MTYPE, _kadt)
+#define mtype_uadt TOKEN(MTYPE, _uadt)
+#define mtype MTYPE
+
+#define mtype_elem TOKEN(MTYPE, _elem)
+#define mtype_add TOKEN(MTYPE, _add)
+#define mtype_del TOKEN(MTYPE, _del)
+#define mtype_test_cidrs TOKEN(MTYPE, _test_cidrs)
+#define mtype_test TOKEN(MTYPE, _test)
+#define mtype_expire TOKEN(MTYPE, _expire)
+#define mtype_resize TOKEN(MTYPE, _resize)
+#define mtype_head TOKEN(MTYPE, _head)
+#define mtype_list TOKEN(MTYPE, _list)
+#define mtype_gc TOKEN(MTYPE, _gc)
+#define mtype_variant TOKEN(MTYPE, _variant)
+#define mtype_data_match TOKEN(MTYPE, _data_match)
+
+#ifndef HKEY_DATALEN
+#define HKEY_DATALEN sizeof(struct mtype_elem)
+#endif
+
+#define HKEY(data, initval, htable_bits) \
+(jhash2((u32 *)(data), HKEY_DATALEN/sizeof(u32), initval) \
+ & jhash_mask(htable_bits))
+
+#ifndef htype
+#define htype HTYPE
+
+/* The generic hash structure */
+struct htype {
+ 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 */
+ size_t dsize; /* data struct size */
+ size_t offset[IPSET_OFFSET_MAX]; /* Offsets to extensions */
+ struct timer_list gc; /* garbage collection when timeout enabled */
+ struct mtype_elem 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 net_prefixes nets[0]; /* book-keeping of prefixes */
+#endif
+};
+#endif
+
+#ifdef IP_SET_HASH_WITH_NETS
+/* 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)
+{
+ 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++) {
+ 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 (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
+mtype_del_cidr(struct htype *h, u8 cidr, u8 nets_length)
+{
+ u8 i, j;
+
+ for (i = 0; i < nets_length - 1 && h->nets[i].cidr != cidr; i++)
+ ;
+ h->nets[i].nets--;
+
+ if (h->nets[i].nets != 0)
+ return;
+
+ 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;
+ }
+}
+#endif
+
+/* Calculate the actual memory size of the set data */
+static size_t
+mtype_ahash_memsize(const struct htype *h, 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 net_prefixes) * nets_length
+#endif
+ + jhash_size(t->htable_bits) * sizeof(struct hbucket);
+
+ for (i = 0; i < jhash_size(t->htable_bits); i++)
+ memsize += t->bucket[i].size * h->dsize;
+
+ return memsize;
+}
+
+/* Flush a hash type of set: destroy all elements */
+static void
+mtype_flush(struct ip_set *set)
+{
+ struct htype *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 net_prefixes)
+ * NETS_LENGTH(set->family));
+#endif
+ h->elements = 0;
+}
+
+/* Destroy a hash type of set */
+static void
+mtype_destroy(struct ip_set *set)
+{
+ struct htype *h = set->data;
+
+ if (set->extensions & IPSET_EXT_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;
+}
+
+static void
+mtype_gc_init(struct ip_set *set, void (*gc)(unsigned long ul_set))
+{
+ struct htype *h = set->data;
+
+ init_timer(&h->gc);
+ h->gc.data = (unsigned long) set;
+ h->gc.function = 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));
+}
+
+static bool
+mtype_same_set(const struct ip_set *a, const struct ip_set *b)
+{
+ const struct htype *x = a->data;
+ const struct htype *y = b->data;
+
+ /* Resizing changes htable_bits, so we ignore it */
+ return x->maxelem == y->maxelem &&
+ x->timeout == y->timeout &&
+#ifdef IP_SET_HASH_WITH_NETMASK
+ x->netmask == y->netmask &&
+#endif
+ a->extensions == b->extensions;
+}
+
+/* Get the ith element from the array block n */
+#define ahash_data(n, i, dsize) \
+ ((struct mtype_elem *)((n)->value + ((i) * (dsize))))
+
+/* Delete expired elements from the hashtable */
+static void
+mtype_expire(struct htype *h, u8 nets_length, size_t dsize)
+{
+ struct htable *t = h->table;
+ struct hbucket *n;
+ struct mtype_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_data(n, j, dsize);
+ if (ip_set_timeout_expired(ext_timeout(data, h))) {
+ pr_debug("expired %u/%u\n", i, j);
+#ifdef IP_SET_HASH_WITH_NETS
+ mtype_del_cidr(h, CIDR(data->cidr),
+ nets_length);
+#endif
+ if (j != n->pos - 1)
+ /* Not last one */
+ memcpy(data,
+ ahash_data(n, n->pos - 1, dsize),
+ dsize);
+ n->pos--;
+ h->elements--;
+ }
+ }
+ if (n->pos + AHASH_INIT_SIZE < n->size) {
+ void *tmp = kzalloc((n->size - AHASH_INIT_SIZE)
+ * dsize,
+ GFP_ATOMIC);
+ if (!tmp)
+ /* Still try to delete expired elements */
+ continue;
+ n->size -= AHASH_INIT_SIZE;
+ memcpy(tmp, n->value, n->size * dsize);
+ kfree(n->value);
+ n->value = tmp;
+ }
+ }
+}
+
+static void
+mtype_gc(unsigned long ul_set)
+{
+ struct ip_set *set = (struct ip_set *) ul_set;
+ struct htype *h = set->data;
+
+ pr_debug("called\n");
+ write_lock_bh(&set->lock);
+ mtype_expire(h, NETS_LENGTH(set->family), h->dsize);
+ write_unlock_bh(&set->lock);
+
+ h->gc.expires = jiffies + IPSET_GC_PERIOD(h->timeout) * HZ;
+ add_timer(&h->gc);
+}
+
+/* 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
+mtype_resize(struct ip_set *set, bool retried)
+{
+ struct htype *h = set->data;
+ struct htable *t, *orig = h->table;
+ u8 htable_bits = orig->htable_bits;
+#ifdef IP_SET_HASH_WITH_NETS
+ u8 flags;
+#endif
+ struct mtype_elem *data;
+ struct mtype_elem *d;
+ struct hbucket *n, *m;
+ u32 i, j;
+ int ret;
+
+ /* Try to cleanup once */
+ if (SET_WITH_TIMEOUT(set) && !retried) {
+ i = h->elements;
+ write_lock_bh(&set->lock);
+ mtype_expire(set->data, NETS_LENGTH(set->family),
+ h->dsize);
+ write_unlock_bh(&set->lock);
+ if (h->elements < i)
+ return 0;
+ }
+
+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 :-) */
+ pr_warning("Cannot increase the hashsize of set %s further\n",
+ set->name);
+ 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, h->dsize);
+#ifdef IP_SET_HASH_WITH_NETS
+ flags = 0;
+ mtype_data_reset_flags(data, &flags);
+#endif
+ m = hbucket(t, HKEY(data, h->initval, htable_bits));
+ ret = hbucket_elem_add(m, AHASH_MAX(h), h->dsize);
+ if (ret < 0) {
+#ifdef IP_SET_HASH_WITH_NETS
+ mtype_data_reset_flags(data, &flags);
+#endif
+ read_unlock_bh(&set->lock);
+ ahash_destroy(t);
+ if (ret == -EAGAIN)
+ goto retry;
+ return ret;
+ }
+ d = ahash_data(m, m->pos++, h->dsize);
+ memcpy(d, data, h->dsize);
+#ifdef IP_SET_HASH_WITH_NETS
+ mtype_data_reset_flags(d, &flags);
+#endif
+ }
+ }
+
+ 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;
+}
+
+/* Add an element to a hash and update the internal counters when succeeded,
+ * otherwise report the proper error code. */
+static int
+mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
+ struct ip_set_ext *mext, u32 flags)
+{
+ struct htype *h = set->data;
+ struct htable *t;
+ const struct mtype_elem *d = value;
+ struct mtype_elem *data;
+ struct hbucket *n;
+ int i, ret = 0;
+ int j = AHASH_MAX(h) + 1;
+ bool flag_exist = flags & IPSET_FLAG_EXIST;
+ u32 key, multi = 0;
+
+ 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);
+
+ if (h->elements >= h->maxelem) {
+ if (net_ratelimit())
+ pr_warning("Set %s is full, maxelem %u reached\n",
+ set->name, 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++) {
+ data = ahash_data(n, i, h->dsize);
+ if (mtype_data_equal(data, d, &multi)) {
+ if (flag_exist ||
+ (SET_WITH_TIMEOUT(set) &&
+ ip_set_timeout_expired(ext_timeout(data, h)))) {
+ /* Just the extensions could be overwritten */
+ j = i;
+ goto reuse_slot;
+ } else {
+ ret = -IPSET_ERR_EXIST;
+ goto out;
+ }
+ }
+ /* Reuse first timed out entry */
+ if (SET_WITH_TIMEOUT(set) &&
+ ip_set_timeout_expired(ext_timeout(data, h)) &&
+ j != AHASH_MAX(h) + 1)
+ j = i;
+ }
+reuse_slot:
+ if (j != AHASH_MAX(h) + 1) {
+ /* 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));
+#endif
+ } else {
+ /* Use/create a new slot */
+ TUNE_AHASH_MAX(h, multi);
+ ret = hbucket_elem_add(n, AHASH_MAX(h), h->dsize);
+ if (ret != 0) {
+ if (ret == -EAGAIN)
+ mtype_data_next(&h->next, d);
+ goto out;
+ }
+ 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));
+#endif
+ h->elements++;
+ }
+ memcpy(data, d, sizeof(struct mtype_elem));
+#ifdef IP_SET_HASH_WITH_NETS
+ mtype_data_set_flags(data, flags);
+#endif
+ if (SET_WITH_TIMEOUT(set))
+ ip_set_timeout_set(ext_timeout(data, h), ext->timeout);
+
+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
+mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext,
+ struct ip_set_ext *mext, u32 flags)
+{
+ struct htype *h = set->data;
+ struct htable *t = h->table;
+ const struct mtype_elem *d = value;
+ struct mtype_elem *data;
+ struct hbucket *n;
+ int i;
+ 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, h->dsize);
+ if (!mtype_data_equal(data, d, &multi))
+ continue;
+ if (SET_WITH_TIMEOUT(set) &&
+ ip_set_timeout_expired(ext_timeout(data, h)))
+ return -IPSET_ERR_EXIST;
+ if (i != n->pos - 1)
+ /* Not last one */
+ memcpy(data, ahash_data(n, n->pos - 1, h->dsize),
+ h->dsize);
+
+ n->pos--;
+ h->elements--;
+#ifdef IP_SET_HASH_WITH_NETS
+ mtype_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)
+ * h->dsize,
+ GFP_ATOMIC);
+ if (!tmp)
+ return 0;
+ n->size -= AHASH_INIT_SIZE;
+ memcpy(tmp, n->value, n->size * h->dsize);
+ kfree(n->value);
+ n->value = tmp;
+ }
+ return 0;
+ }
+
+ return -IPSET_ERR_EXIST;
+}
+
+static inline int
+mtype_data_match(struct mtype_elem *data, const struct ip_set_ext *ext,
+ struct ip_set_ext *mext, struct ip_set *set, u32 flags)
+{
+ return mtype_do_data_match(data);
+}
+
+#ifdef IP_SET_HASH_WITH_NETS
+/* Special test function which takes into account the different network
+ * sizes added to the set */
+static int
+mtype_test_cidrs(struct ip_set *set, struct mtype_elem *d,
+ const struct ip_set_ext *ext,
+ struct ip_set_ext *mext, u32 flags)
+{
+ struct htype *h = set->data;
+ struct htable *t = h->table;
+ struct hbucket *n;
+ struct mtype_elem *data;
+ int i, j = 0;
+ u32 key, multi = 0;
+ u8 nets_length = NETS_LENGTH(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);
+ key = HKEY(d, h->initval, t->htable_bits);
+ n = hbucket(t, key);
+ for (i = 0; i < n->pos; i++) {
+ data = ahash_data(n, i, h->dsize);
+ if (!mtype_data_equal(data, d, &multi))
+ continue;
+ if (SET_WITH_TIMEOUT(set)) {
+ if (!ip_set_timeout_expired(
+ ext_timeout(data, h)))
+ return mtype_data_match(data, ext,
+ mext, set,
+ flags);
+#ifdef IP_SET_HASH_WITH_MULTI
+ multi = 0;
+#endif
+ } else
+ return mtype_data_match(data, ext,
+ mext, set, flags);
+ }
+ }
+ return 0;
+}
+#endif
+
+/* Test whether the element is added to the set */
+static int
+mtype_test(struct ip_set *set, void *value, const struct ip_set_ext *ext,
+ struct ip_set_ext *mext, u32 flags)
+{
+ struct htype *h = set->data;
+ struct htable *t = h->table;
+ struct mtype_elem *d = value;
+ struct hbucket *n;
+ struct mtype_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 (CIDR(d->cidr) == SET_HOST_MASK(set->family))
+ return mtype_test_cidrs(set, d, ext, mext, flags);
+#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, h->dsize);
+ if (mtype_data_equal(data, d, &multi) &&
+ !(SET_WITH_TIMEOUT(set) &&
+ ip_set_timeout_expired(ext_timeout(data, h))))
+ return mtype_data_match(data, ext, mext, set, flags);
+ }
+ return 0;
+}
+
+/* Reply a HEADER request: fill out the header part of the set */
+static int
+mtype_head(struct ip_set *set, struct sk_buff *skb)
+{
+ const struct htype *h = set->data;
+ struct nlattr *nested;
+ size_t memsize;
+
+ read_lock_bh(&set->lock);
+ memsize = mtype_ahash_memsize(h, NETS_LENGTH(set->family));
+ read_unlock_bh(&set->lock);
+
+ nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
+ if (!nested)
+ goto nla_put_failure;
+ if (nla_put_net32(skb, IPSET_ATTR_HASHSIZE,
+ htonl(jhash_size(h->table->htable_bits))) ||
+ nla_put_net32(skb, IPSET_ATTR_MAXELEM, htonl(h->maxelem)))
+ goto nla_put_failure;
+#ifdef IP_SET_HASH_WITH_NETMASK
+ if (h->netmask != HOST_MASK &&
+ nla_put_u8(skb, IPSET_ATTR_NETMASK, h->netmask))
+ goto nla_put_failure;
+#endif
+ if (nla_put_net32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1)) ||
+ nla_put_net32(skb, IPSET_ATTR_MEMSIZE, htonl(memsize)) ||
+ ((set->extensions & IPSET_EXT_TIMEOUT) &&
+ nla_put_net32(skb, IPSET_ATTR_TIMEOUT, htonl(h->timeout))))
+ goto nla_put_failure;
+ 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
+mtype_list(const struct ip_set *set,
+ struct sk_buff *skb, struct netlink_callback *cb)
+{
+ const struct htype *h = set->data;
+ const struct htable *t = h->table;
+ struct nlattr *atd, *nested;
+ const struct hbucket *n;
+ const struct mtype_elem *e;
+ 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++) {
+ e = ahash_data(n, i, h->dsize);
+ if (SET_WITH_TIMEOUT(set) &&
+ ip_set_timeout_expired(ext_timeout(e, h)))
+ continue;
+ pr_debug("list hash %lu hbucket %p i %u, data %p\n",
+ cb->args[2], n, i, e);
+ 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 (mtype_data_list(skb, e))
+ goto nla_put_failure;
+ if (SET_WITH_TIMEOUT(set) &&
+ nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
+ htonl(ip_set_timeout_get(
+ ext_timeout(e, h)))))
+ 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
+TOKEN(MTYPE, _kadt)(struct ip_set *set, const struct sk_buff *skb,
+ const struct xt_action_param *par,
+ enum ipset_adt adt, struct ip_set_adt_opt *opt);
+
+static int
+TOKEN(MTYPE, _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 mtype_variant = {
+ .kadt = mtype_kadt,
+ .uadt = mtype_uadt,
+ .adt = {
+ [IPSET_ADD] = mtype_add,
+ [IPSET_DEL] = mtype_del,
+ [IPSET_TEST] = mtype_test,
+ },
+ .destroy = mtype_destroy,
+ .flush = mtype_flush,
+ .head = mtype_head,
+ .list = mtype_list,
+ .resize = mtype_resize,
+ .same_set = mtype_same_set,
+};
+
+#ifdef IP_SET_EMIT_CREATE
+static int
+TOKEN(HTYPE, _create)(struct ip_set *set, struct nlattr *tb[], u32 flags)
+{
+ u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
+ u8 hbits;
+#ifdef IP_SET_HASH_WITH_NETMASK
+ u8 netmask;
+#endif
+ size_t hsize;
+ struct HTYPE *h;
+
+ if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
+ return -IPSET_ERR_INVALID_FAMILY;
+#ifdef IP_SET_HASH_WITH_NETMASK
+ netmask = set->family == NFPROTO_IPV4 ? 32 : 128;
+ pr_debug("Create set %s with family %s\n",
+ set->name, set->family == NFPROTO_IPV4 ? "inet" : "inet6");
+#endif
+
+ if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
+ return -IPSET_ERR_PROTOCOL;
+
+ if (tb[IPSET_ATTR_HASHSIZE]) {
+ hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
+ if (hashsize < IPSET_MIMINAL_HASHSIZE)
+ hashsize = IPSET_MIMINAL_HASHSIZE;
+ }
+
+ if (tb[IPSET_ATTR_MAXELEM])
+ maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
+
+#ifdef IP_SET_HASH_WITH_NETMASK
+ if (tb[IPSET_ATTR_NETMASK]) {
+ netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
+
+ if ((set->family == NFPROTO_IPV4 && netmask > 32) ||
+ (set->family == NFPROTO_IPV6 && netmask > 128) ||
+ netmask == 0)
+ return -IPSET_ERR_INVALID_NETMASK;
+ }
+#endif
+
+ hsize = sizeof(*h);
+#ifdef IP_SET_HASH_WITH_NETS
+ hsize += sizeof(struct net_prefixes) *
+ (set->family == NFPROTO_IPV4 ? 32 : 128);
+#endif
+ h = kzalloc(hsize, GFP_KERNEL);
+ if (!h)
+ return -ENOMEM;
+
+ h->maxelem = maxelem;
+#ifdef IP_SET_HASH_WITH_NETMASK
+ h->netmask = netmask;
+#endif
+ get_random_bytes(&h->initval, sizeof(h->initval));
+ h->timeout = IPSET_NO_TIMEOUT;
+
+ hbits = htable_bits(hashsize);
+ hsize = htable_size(hbits);
+ if (hsize == 0) {
+ kfree(h);
+ return -ENOMEM;
+ }
+ h->table = ip_set_alloc(hsize);
+ if (!h->table) {
+ kfree(h);
+ return -ENOMEM;
+ }
+ h->table->htable_bits = hbits;
+
+ set->data = h;
+ if (set->family == NFPROTO_IPV4)
+ set->variant = &TOKEN(HTYPE, 4_variant);
+ else
+ set->variant = &TOKEN(HTYPE, 6_variant);
+
+ if (tb[IPSET_ATTR_TIMEOUT]) {
+ h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
+ set->extensions |= IPSET_EXT_TIMEOUT;
+ if (set->family == NFPROTO_IPV4) {
+ h->dsize = sizeof(struct TOKEN(HTYPE, 4t_elem));
+ h->offset[IPSET_OFFSET_TIMEOUT] =
+ offsetof(struct TOKEN(HTYPE, 4t_elem),
+ timeout);
+ TOKEN(HTYPE, 4_gc_init)(set, TOKEN(HTYPE, 4_gc));
+ } else {
+ h->dsize = sizeof(struct TOKEN(HTYPE, 6t_elem));
+ h->offset[IPSET_OFFSET_TIMEOUT] =
+ offsetof(struct TOKEN(HTYPE, 6t_elem),
+ timeout);
+ TOKEN(HTYPE, 6_gc_init)(set, TOKEN(HTYPE, 6_gc));
+ }
+ } else {
+ if (set->family == NFPROTO_IPV4)
+ h->dsize = sizeof(struct TOKEN(HTYPE, 4_elem));
+ else
+ h->dsize = sizeof(struct TOKEN(HTYPE, 6_elem));
+ }
+
+ pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
+ set->name, jhash_size(h->table->htable_bits),
+ h->table->htable_bits, h->maxelem, set->data, h->table);
+
+ return 0;
+}
+#endif /* IP_SET_EMIT_CREATE */
projects / ~andy / linux / commitdiff