Skip to content

L
linux
Commit e920dde5 authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
1 Browse files
Options

netfilter: nft_set_bitmap: keep a list of dummy elements 

Element comments may come without any prior set flag, so we have to keep
a list of dummy struct nft_set_ext to keep this information around. This
is only useful for set dumps to userspace. From the packet path, this
set type relies on the bitmap representation. This patch simplifies the
logic since we don't need to allocate the dummy nft_set_ext structure
anymore on the fly at the cost of increasing memory consumption because
of the list of dummy struct nft_set_ext.

Fixes: 665153ff ("netfilter: nf_tables: add bitmap set type")
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 170a1fb9
Show whitespace changes
Inline Side-by-side
Showing with 66 additions and 80 deletions
net/netfilter/nft_set_bitmap.c
View file @ e920dde5
......@@ -15,6 +15,11 @@
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
struct nft_bitmap_elem {
struct list_head head;
struct nft_set_ext ext;
};
/* This bitmap uses two bits to represent one element. These two bits determine
* the element state in the current and the future generation.
*
......@@ -41,6 +46,7 @@
* restore its previous state.
*/
struct nft_bitmap {
struct list_head list;
u16 bitmap_size;
u8 bitmap[];
};
......@@ -82,21 +88,43 @@ static bool nft_bitmap_lookup(const struct net *net, const struct nft_set *set,
return nft_bitmap_active(priv->bitmap, idx, off, genmask);
}
static struct nft_bitmap_elem *
nft_bitmap_elem_find(const struct nft_set *set, struct nft_bitmap_elem *this,
u8 genmask)
{
const struct nft_bitmap *priv = nft_set_priv(set);
struct nft_bitmap_elem *be;
list_for_each_entry_rcu(be, &priv->list, head) {
if (memcmp(nft_set_ext_key(&be->ext),
nft_set_ext_key(&this->ext), set->klen) ||
!nft_set_elem_active(&be->ext, genmask))
continue;
return be;
}
return NULL;
}
static int nft_bitmap_insert(const struct net *net, const struct nft_set *set,
const struct nft_set_elem *elem,
struct nft_set_ext **_ext)
struct nft_set_ext **ext)
{
struct nft_bitmap *priv = nft_set_priv(set);
struct nft_set_ext *ext = elem->priv;
struct nft_bitmap_elem *new = elem->priv, *be;
u8 genmask = nft_genmask_next(net);
u32 idx, off;
nft_bitmap_location(set, nft_set_ext_key(ext), &idx, &off);
if (nft_bitmap_active(priv->bitmap, idx, off, genmask))
be = nft_bitmap_elem_find(set, new, genmask);
if (be) {
*ext = &be->ext;
return -EEXIST;
}
nft_bitmap_location(set, nft_set_ext_key(&new->ext), &idx, &off);
/* Enter 01 state. */
priv->bitmap[idx] |= (genmask << off);
list_add_tail_rcu(&new->head, &priv->list);
return 0;
}
......@@ -106,13 +134,14 @@ static void nft_bitmap_remove(const struct net *net,
const struct nft_set_elem *elem)
{
struct nft_bitmap *priv = nft_set_priv(set);
struct nft_set_ext *ext = elem->priv;
struct nft_bitmap_elem *be = elem->priv;
u8 genmask = nft_genmask_next(net);
u32 idx, off;
nft_bitmap_location(set, nft_set_ext_key(ext), &idx, &off);
nft_bitmap_location(set, nft_set_ext_key(&be->ext), &idx, &off);
/* Enter 00 state. */
priv->bitmap[idx] &= ~(genmask << off);
list_del_rcu(&be->head);
}
static void nft_bitmap_activate(const struct net *net,
......@@ -120,73 +149,52 @@ static void nft_bitmap_activate(const struct net *net,
const struct nft_set_elem *elem)
{
struct nft_bitmap *priv = nft_set_priv(set);
struct nft_set_ext *ext = elem->priv;
struct nft_bitmap_elem *be = elem->priv;
u8 genmask = nft_genmask_next(net);
u32 idx, off;
nft_bitmap_location(set, nft_set_ext_key(ext), &idx, &off);
nft_bitmap_location(set, nft_set_ext_key(&be->ext), &idx, &off);
/* Enter 11 state. */
priv->bitmap[idx] |= (genmask << off);
nft_set_elem_change_active(net, set, &be->ext);
}
static bool nft_bitmap_flush(const struct net *net,
const struct nft_set *set, void *ext)
const struct nft_set *set, void *_be)
{
struct nft_bitmap *priv = nft_set_priv(set);
u8 genmask = nft_genmask_next(net);
struct nft_bitmap_elem *be = _be;
u32 idx, off;
nft_bitmap_location(set, nft_set_ext_key(ext), &idx, &off);
nft_bitmap_location(set, nft_set_ext_key(&be->ext), &idx, &off);
/* Enter 10 state, similar to deactivation. */
priv->bitmap[idx] &= ~(genmask << off);
nft_set_elem_change_active(net, set, &be->ext);
return true;
}
static struct nft_set_ext *nft_bitmap_ext_alloc(const struct nft_set *set,
const struct nft_set_elem *elem)
{
struct nft_set_ext_tmpl tmpl;
struct nft_set_ext *ext;
nft_set_ext_prepare(&tmpl);
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
ext = kzalloc(tmpl.len, GFP_KERNEL);
if (!ext)
return NULL;
nft_set_ext_init(ext, &tmpl);
memcpy(nft_set_ext_key(ext), elem->key.val.data, set->klen);
return ext;
}
static void *nft_bitmap_deactivate(const struct net *net,
const struct nft_set *set,
const struct nft_set_elem *elem)
{
struct nft_bitmap *priv = nft_set_priv(set);
struct nft_bitmap_elem *this = elem->priv, *be;
u8 genmask = nft_genmask_next(net);
struct nft_set_ext *ext;
u32 idx, off;
nft_bitmap_location(set, elem->key.val.data, &idx, &off);
if (!nft_bitmap_active(priv->bitmap, idx, off, genmask))
return NULL;
/* We have no real set extension since this is a bitmap, allocate this
* dummy object that is released from the commit/abort path.
*/
ext = nft_bitmap_ext_alloc(set, elem);
if (!ext)
be = nft_bitmap_elem_find(set, this, genmask);
if (!be)
return NULL;
/* Enter 10 state. */
priv->bitmap[idx] &= ~(genmask << off);
nft_set_elem_change_active(net, set, &be->ext);
return ext;
return be;
}
static void nft_bitmap_walk(const struct nft_ctx *ctx,
......@@ -194,48 +202,24 @@ static void nft_bitmap_walk(const struct nft_ctx *ctx,
struct nft_set_iter *iter)
{
const struct nft_bitmap *priv = nft_set_priv(set);
struct nft_set_ext_tmpl tmpl;
struct nft_bitmap_elem *be;
struct nft_set_elem elem;
struct nft_set_ext *ext;
int idx, off;
u16 key;
nft_set_ext_prepare(&tmpl);
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
for (idx = 0; idx < priv->bitmap_size; idx++) {
for (off = 0; off < BITS_PER_BYTE; off += 2) {
list_for_each_entry_rcu(be, &priv->list, head) {
if (iter->count < iter->skip)
goto cont;
if (!nft_bitmap_active(priv->bitmap, idx, off,
iter->genmask))
if (!nft_set_elem_active(&be->ext, iter->genmask))
goto cont;
ext = kzalloc(tmpl.len, GFP_KERNEL);
if (!ext) {
iter->err = -ENOMEM;
return;
}
nft_set_ext_init(ext, &tmpl);
key = ((idx * BITS_PER_BYTE) + off) >> 1;
memcpy(nft_set_ext_key(ext), &key, set->klen);
elem.priv = be;
elem.priv = ext;
iter->err = iter->fn(ctx, set, iter, &elem);
/* On set flush, this dummy extension object is released
* from the commit/abort path.
*/
if (!iter->flush)
kfree(ext);
if (iter->err < 0)
return;
cont:
iter->count++;
}
}
}
/* The bitmap size is pow(2, key length in bits) / bits per byte. This is
......@@ -265,6 +249,7 @@ static int nft_bitmap_init(const struct nft_set *set,
{
struct nft_bitmap *priv = nft_set_priv(set);
INIT_LIST_HEAD(&priv->list);
priv->bitmap_size = nft_bitmap_size(set->klen);
return 0;
......@@ -290,6 +275,7 @@ static bool nft_bitmap_estimate(const struct nft_set_desc *desc, u32 features,
static struct nft_set_ops nft_bitmap_ops __read_mostly = {
.privsize = nft_bitmap_privsize,
.elemsize = offsetof(struct nft_bitmap_elem, ext),
.estimate = nft_bitmap_estimate,
.init = nft_bitmap_init,
.destroy = nft_bitmap_destroy,
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7