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Date: Fri, 4 Oct 2013 10:33:02 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 17/33] netfilter: ipset: Support extensions which need a per data destroy function
From: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
Signed-off-by: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
---
include/linux/netfilter/ipset/ip_set.h | 22 +++++++---
net/netfilter/ipset/ip_set_bitmap_gen.h | 38 ++++++++++++++---
net/netfilter/ipset/ip_set_hash_gen.h | 71 ++++++++++++++++++++-----------
net/netfilter/ipset/ip_set_list_set.c | 19 ++++++---
4 files changed, 107 insertions(+), 43 deletions(-)
diff --git a/include/linux/netfilter/ipset/ip_set.h b/include/linux/netfilter/ipset/ip_set.h
index 66d6bd4..6372ee2 100644
--- a/include/linux/netfilter/ipset/ip_set.h
+++ b/include/linux/netfilter/ipset/ip_set.h
@@ -49,11 +49,13 @@ enum ip_set_feature {
/* Set extensions */
enum ip_set_extension {
- IPSET_EXT_NONE = 0,
- IPSET_EXT_BIT_TIMEOUT = 1,
+ IPSET_EXT_BIT_TIMEOUT = 0,
IPSET_EXT_TIMEOUT = (1 << IPSET_EXT_BIT_TIMEOUT),
- IPSET_EXT_BIT_COUNTER = 2,
+ IPSET_EXT_BIT_COUNTER = 1,
IPSET_EXT_COUNTER = (1 << IPSET_EXT_BIT_COUNTER),
+ /* Mark set with an extension which needs to call destroy */
+ IPSET_EXT_BIT_DESTROY = 7,
+ IPSET_EXT_DESTROY = (1 << IPSET_EXT_BIT_DESTROY),
};
#define SET_WITH_TIMEOUT(s) ((s)->extensions & IPSET_EXT_TIMEOUT)
@@ -68,6 +70,8 @@ enum ip_set_ext_id {
/* Extension type */
struct ip_set_ext_type {
+ /* Destroy extension private data (can be NULL) */
+ void (*destroy)(void *ext);
enum ip_set_extension type;
enum ipset_cadt_flags flag;
/* Size and minimal alignment */
@@ -88,13 +92,21 @@ struct ip_set_counter {
atomic64_t packets;
};
+struct ip_set;
+
+static inline void
+ip_set_ext_destroy(struct ip_set *set, void *data)
+{
+ /* Check that the extension is enabled for the set and
+ * call it's destroy function for its extension part in data.
+ */
+}
+
#define ext_timeout(e, s) \
(unsigned long *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_TIMEOUT])
#define ext_counter(e, s) \
(struct ip_set_counter *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_COUNTER])
-struct ip_set;
-
typedef int (*ipset_adtfn)(struct ip_set *set, void *value,
const struct ip_set_ext *ext,
struct ip_set_ext *mext, u32 cmdflags);
diff --git a/net/netfilter/ipset/ip_set_bitmap_gen.h b/net/netfilter/ipset/ip_set_bitmap_gen.h
index f32ddbc..4515fe8 100644
--- a/net/netfilter/ipset/ip_set_bitmap_gen.h
+++ b/net/netfilter/ipset/ip_set_bitmap_gen.h
@@ -12,6 +12,7 @@
#define mtype_gc_test IPSET_TOKEN(MTYPE, _gc_test)
#define mtype_is_filled IPSET_TOKEN(MTYPE, _is_filled)
#define mtype_do_add IPSET_TOKEN(MTYPE, _do_add)
+#define mtype_ext_cleanup IPSET_TOKEN(MTYPE, _ext_cleanup)
#define mtype_do_del IPSET_TOKEN(MTYPE, _do_del)
#define mtype_do_list IPSET_TOKEN(MTYPE, _do_list)
#define mtype_do_head IPSET_TOKEN(MTYPE, _do_head)
@@ -47,6 +48,17 @@ mtype_gc_init(struct ip_set *set, void (*gc)(unsigned long ul_set))
}
static void
+mtype_ext_cleanup(struct ip_set *set)
+{
+ struct mtype *map = set->data;
+ u32 id;
+
+ for (id = 0; id < map->elements; id++)
+ if (test_bit(id, map->members))
+ ip_set_ext_destroy(set, get_ext(set, map, id));
+}
+
+static void
mtype_destroy(struct ip_set *set)
{
struct mtype *map = set->data;
@@ -55,8 +67,11 @@ mtype_destroy(struct ip_set *set)
del_timer_sync(&map->gc);
ip_set_free(map->members);
- if (set->dsize)
+ if (set->dsize) {
+ if (set->extensions & IPSET_EXT_DESTROY)
+ mtype_ext_cleanup(set);
ip_set_free(map->extensions);
+ }
kfree(map);
set->data = NULL;
@@ -67,6 +82,8 @@ mtype_flush(struct ip_set *set)
{
struct mtype *map = set->data;
+ if (set->extensions & IPSET_EXT_DESTROY)
+ mtype_ext_cleanup(set);
memset(map->members, 0, map->memsize);
}
@@ -132,6 +149,8 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
ret = 0;
else if (!(flags & IPSET_FLAG_EXIST))
return -IPSET_ERR_EXIST;
+ /* Element is re-added, cleanup extensions */
+ ip_set_ext_destroy(set, x);
}
if (SET_WITH_TIMEOUT(set))
@@ -152,11 +171,14 @@ mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext,
{
struct mtype *map = set->data;
const struct mtype_adt_elem *e = value;
- const void *x = get_ext(set, map, e->id);
+ void *x = get_ext(set, map, e->id);
- if (mtype_do_del(e, map) ||
- (SET_WITH_TIMEOUT(set) &&
- ip_set_timeout_expired(ext_timeout(x, set))))
+ if (mtype_do_del(e, map))
+ return -IPSET_ERR_EXIST;
+
+ ip_set_ext_destroy(set, x);
+ if (SET_WITH_TIMEOUT(set) &&
+ ip_set_timeout_expired(ext_timeout(x, set)))
return -IPSET_ERR_EXIST;
return 0;
@@ -235,7 +257,7 @@ mtype_gc(unsigned long ul_set)
{
struct ip_set *set = (struct ip_set *) ul_set;
struct mtype *map = set->data;
- const void *x;
+ void *x;
u32 id;
/* We run parallel with other readers (test element)
@@ -244,8 +266,10 @@ mtype_gc(unsigned long ul_set)
for (id = 0; id < map->elements; id++)
if (mtype_gc_test(id, map, set->dsize)) {
x = get_ext(set, map, id);
- if (ip_set_timeout_expired(ext_timeout(x, set)))
+ if (ip_set_timeout_expired(ext_timeout(x, set))) {
clear_bit(id, map->members);
+ ip_set_ext_destroy(set, x);
+ }
}
read_unlock_bh(&set->lock);
diff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h
index 3999f17..3c26e5b 100644
--- a/net/netfilter/ipset/ip_set_hash_gen.h
+++ b/net/netfilter/ipset/ip_set_hash_gen.h
@@ -117,23 +117,6 @@ htable_bits(u32 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)
{
@@ -192,6 +175,8 @@ hbucket_elem_add(struct hbucket *n, u8 ahash_max, size_t dsize)
#undef mtype_data_next
#undef mtype_elem
+#undef mtype_ahash_destroy
+#undef mtype_ext_cleanup
#undef mtype_add_cidr
#undef mtype_del_cidr
#undef mtype_ahash_memsize
@@ -230,6 +215,8 @@ hbucket_elem_add(struct hbucket *n, u8 ahash_max, size_t dsize)
#define mtype_data_list IPSET_TOKEN(MTYPE, _data_list)
#define mtype_data_next IPSET_TOKEN(MTYPE, _data_next)
#define mtype_elem IPSET_TOKEN(MTYPE, _elem)
+#define mtype_ahash_destroy IPSET_TOKEN(MTYPE, _ahash_destroy)
+#define mtype_ext_cleanup IPSET_TOKEN(MTYPE, _ext_cleanup)
#define mtype_add_cidr IPSET_TOKEN(MTYPE, _add_cidr)
#define mtype_del_cidr IPSET_TOKEN(MTYPE, _del_cidr)
#define mtype_ahash_memsize IPSET_TOKEN(MTYPE, _ahash_memsize)
@@ -359,6 +346,19 @@ mtype_ahash_memsize(const struct htype *h, const struct htable *t,
return memsize;
}
+/* Get the ith element from the array block n */
+#define ahash_data(n, i, dsize) \
+ ((struct mtype_elem *)((n)->value + ((i) * (dsize))))
+
+static void
+mtype_ext_cleanup(struct ip_set *set, struct hbucket *n)
+{
+ int i;
+
+ for (i = 0; i < n->pos; i++)
+ ip_set_ext_destroy(set, ahash_data(n, i, set->dsize));
+}
+
/* Flush a hash type of set: destroy all elements */
static void
mtype_flush(struct ip_set *set)
@@ -372,6 +372,8 @@ mtype_flush(struct ip_set *set)
for (i = 0; i < jhash_size(t->htable_bits); i++) {
n = hbucket(t, i);
if (n->size) {
+ if (set->extensions & IPSET_EXT_DESTROY)
+ mtype_ext_cleanup(set, n);
n->size = n->pos = 0;
/* FIXME: use slab cache */
kfree(n->value);
@@ -383,6 +385,26 @@ mtype_flush(struct ip_set *set)
h->elements = 0;
}
+/* Destroy the hashtable part of the set */
+static void
+mtype_ahash_destroy(struct ip_set *set, 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) {
+ if (set->extensions & IPSET_EXT_DESTROY)
+ mtype_ext_cleanup(set, n);
+ /* FIXME: use slab cache */
+ kfree(n->value);
+ }
+ }
+
+ ip_set_free(t);
+}
+
/* Destroy a hash type of set */
static void
mtype_destroy(struct ip_set *set)
@@ -392,7 +414,7 @@ mtype_destroy(struct ip_set *set)
if (set->extensions & IPSET_EXT_TIMEOUT)
del_timer_sync(&h->gc);
- ahash_destroy(rcu_dereference_bh_nfnl(h->table));
+ mtype_ahash_destroy(set, rcu_dereference_bh_nfnl(h->table));
#ifdef IP_SET_HASH_WITH_RBTREE
rbtree_destroy(&h->rbtree);
#endif
@@ -430,10 +452,6 @@ mtype_same_set(const struct ip_set *a, const struct ip_set *b)
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 ip_set *set, struct htype *h, u8 nets_length, size_t dsize)
@@ -456,6 +474,7 @@ mtype_expire(struct ip_set *set, struct htype *h, u8 nets_length, size_t dsize)
mtype_del_cidr(h, CIDR(data->cidr),
nets_length, 0);
#endif
+ ip_set_ext_destroy(set, data);
if (j != n->pos - 1)
/* Not last one */
memcpy(data,
@@ -557,7 +576,7 @@ retry:
mtype_data_reset_flags(data, &flags);
#endif
read_unlock_bh(&set->lock);
- ahash_destroy(t);
+ mtype_ahash_destroy(set, t);
if (ret == -EAGAIN)
goto retry;
return ret;
@@ -578,7 +597,7 @@ retry:
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);
+ mtype_ahash_destroy(set, orig);
return 0;
}
@@ -642,6 +661,7 @@ reuse_slot:
mtype_del_cidr(h, CIDR(data->cidr), NLEN(set->family), 0);
mtype_add_cidr(h, CIDR(d->cidr), NLEN(set->family), 0);
#endif
+ ip_set_ext_destroy(set, data);
} else {
/* Use/create a new slot */
TUNE_AHASH_MAX(h, multi);
@@ -707,6 +727,7 @@ mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext,
#ifdef IP_SET_HASH_WITH_NETS
mtype_del_cidr(h, CIDR(d->cidr), NLEN(set->family), 0);
#endif
+ ip_set_ext_destroy(set, data);
if (n->pos + AHASH_INIT_SIZE < n->size) {
void *tmp = kzalloc((n->size - AHASH_INIT_SIZE)
* set->dsize,
@@ -1033,7 +1054,7 @@ IPSET_TOKEN(HTYPE, _create)(struct ip_set *set, struct nlattr *tb[], u32 flags)
rcu_assign_pointer(h->table, t);
set->data = h;
- if (set->family == NFPROTO_IPV4) {
+ if (set->family == NFPROTO_IPV4) {
set->variant = &IPSET_TOKEN(HTYPE, 4_variant);
set->dsize = ip_set_elem_len(set, tb,
sizeof(struct IPSET_TOKEN(HTYPE, 4_elem)));
diff --git a/net/netfilter/ipset/ip_set_list_set.c b/net/netfilter/ipset/ip_set_list_set.c
index 7fd11c7..e44986a 100644
--- a/net/netfilter/ipset/ip_set_list_set.c
+++ b/net/netfilter/ipset/ip_set_list_set.c
@@ -168,16 +168,19 @@ list_set_add(struct ip_set *set, u32 i, struct set_adt_elem *d,
struct set_elem *e = list_set_elem(set, map, i);
if (e->id != IPSET_INVALID_ID) {
- if (i == map->size - 1)
+ if (i == map->size - 1) {
/* Last element replaced: e.g. add new,before,last */
ip_set_put_byindex(e->id);
- else {
+ ip_set_ext_destroy(set, e);
+ } else {
struct set_elem *x = list_set_elem(set, map,
map->size - 1);
/* Last element pushed off */
- if (x->id != IPSET_INVALID_ID)
+ if (x->id != IPSET_INVALID_ID) {
ip_set_put_byindex(x->id);
+ ip_set_ext_destroy(set, x);
+ }
memmove(list_set_elem(set, map, i + 1), e,
set->dsize * (map->size - (i + 1)));
}
@@ -198,6 +201,7 @@ list_set_del(struct ip_set *set, u32 i)
struct set_elem *e = list_set_elem(set, map, i);
ip_set_put_byindex(e->id);
+ ip_set_ext_destroy(set, e);
if (i < map->size - 1)
memmove(e, list_set_elem(set, map, i + 1),
@@ -266,14 +270,14 @@ list_set_uadd(struct ip_set *set, void *value, const struct ip_set_ext *ext,
bool flag_exist = flags & IPSET_FLAG_EXIST;
u32 i, ret = 0;
+ if (SET_WITH_TIMEOUT(set))
+ set_cleanup_entries(set);
+
/* Check already added element */
for (i = 0; i < map->size; i++) {
e = list_set_elem(set, map, i);
if (e->id == IPSET_INVALID_ID)
goto insert;
- else if (SET_WITH_TIMEOUT(set) &&
- ip_set_timeout_expired(ext_timeout(e, set)))
- continue;
else if (e->id != d->id)
continue;
@@ -286,6 +290,8 @@ list_set_uadd(struct ip_set *set, void *value, const struct ip_set_ext *ext,
/* Can't re-add */
return -IPSET_ERR_EXIST;
/* Update extensions */
+ ip_set_ext_destroy(set, e);
+
if (SET_WITH_TIMEOUT(set))
ip_set_timeout_set(ext_timeout(e, set), ext->timeout);
if (SET_WITH_COUNTER(set))
@@ -423,6 +429,7 @@ list_set_flush(struct ip_set *set)
e = list_set_elem(set, map, i);
if (e->id != IPSET_INVALID_ID) {
ip_set_put_byindex(e->id);
+ ip_set_ext_destroy(set, e);
e->id = IPSET_INVALID_ID;
}
}
--
1.7.10.4
--
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