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netfilter: nft_set_rbtree: use binary search array in get command

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Rework .get interface to use the binary search array, this needs a specific
lookup function to match on end intervals (<=). Packet path lookup is slight
different because match is on lesser value, not equal (ie. <).

After this patch, seqcount can be removed in a follow up patch.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Pablo Neira Ayuso
2026-01-21 01:08:46 +01:00
committed by Florian Westphal
parent 7e43e0a114
commit 2aa34191f0
1 changed files with 64 additions and 90 deletions
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154
net/netfilter/nft_set_rbtree.c
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@@ -62,96 +62,6 @@ static int nft_rbtree_cmp(const struct nft_set *set,
set->klen);
}
static bool __nft_rbtree_get(const struct net *net, const struct nft_set *set,
const u32 *key, struct nft_rbtree_elem **elem,
unsigned int seq, unsigned int flags, u8 genmask)
{
struct nft_rbtree_elem *rbe, *interval = NULL;
struct nft_rbtree *priv = nft_set_priv(set);
const struct rb_node *parent;
const void *this;
int d;
parent = rcu_dereference_raw(priv->root.rb_node);
while (parent != NULL) {
if (read_seqcount_retry(&priv->count, seq))
return false;
rbe = rb_entry(parent, struct nft_rbtree_elem, node);
this = nft_set_ext_key(&rbe->ext);
d = memcmp(this, key, set->klen);
if (d < 0) {
parent = rcu_dereference_raw(parent->rb_left);
if (!(flags & NFT_SET_ELEM_INTERVAL_END))
interval = rbe;
} else if (d > 0) {
parent = rcu_dereference_raw(parent->rb_right);
if (flags & NFT_SET_ELEM_INTERVAL_END)
interval = rbe;
} else {
if (!nft_set_elem_active(&rbe->ext, genmask)) {
parent = rcu_dereference_raw(parent->rb_left);
continue;
}
if (nft_set_elem_expired(&rbe->ext))
return false;
if (!nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) ||
(*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END) ==
(flags & NFT_SET_ELEM_INTERVAL_END)) {
*elem = rbe;
return true;
}
if (nft_rbtree_interval_end(rbe))
interval = NULL;
parent = rcu_dereference_raw(parent->rb_left);
}
}
if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
nft_set_elem_active(&interval->ext, genmask) &&
!nft_set_elem_expired(&interval->ext) &&
((!nft_rbtree_interval_end(interval) &&
!(flags & NFT_SET_ELEM_INTERVAL_END)) ||
(nft_rbtree_interval_end(interval) &&
(flags & NFT_SET_ELEM_INTERVAL_END)))) {
*elem = interval;
return true;
}
return false;
}
static struct nft_elem_priv *
nft_rbtree_get(const struct net *net, const struct nft_set *set,
const struct nft_set_elem *elem, unsigned int flags)
{
struct nft_rbtree *priv = nft_set_priv(set);
unsigned int seq = read_seqcount_begin(&priv->count);
struct nft_rbtree_elem *rbe = ERR_PTR(-ENOENT);
const u32 *key = (const u32 *)&elem->key.val;
u8 genmask = nft_genmask_cur(net);
bool ret;
ret = __nft_rbtree_get(net, set, key, &rbe, seq, flags, genmask);
if (ret || !read_seqcount_retry(&priv->count, seq))
return &rbe->priv;
read_lock_bh(&priv->lock);
seq = read_seqcount_begin(&priv->count);
ret = __nft_rbtree_get(net, set, key, &rbe, seq, flags, genmask);
read_unlock_bh(&priv->lock);
if (!ret)
return ERR_PTR(-ENOENT);
return &rbe->priv;
}
struct nft_array_lookup_ctx {
const u32 *key;
u32 klen;
@@ -206,6 +116,70 @@ nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
return interval->from;
}
struct nft_array_get_ctx {
const u32 *key;
unsigned int flags;
u32 klen;
};
static int nft_array_get_cmp(const void *pkey, const void *entry)
{
const struct nft_array_interval *interval = entry;
const struct nft_array_get_ctx *ctx = pkey;
int a, b;
if (!interval->from)
return 1;
a = memcmp(ctx->key, nft_set_ext_key(interval->from), ctx->klen);
if (!interval->to)
b = -1;
else
b = memcmp(ctx->key, nft_set_ext_key(interval->to), ctx->klen);
if (a >= 0) {
if (ctx->flags & NFT_SET_ELEM_INTERVAL_END && b <= 0)
return 0;
else if (b < 0)
return 0;
}
if (a < 0)
return -1;
return 1;
}
static struct nft_elem_priv *
nft_rbtree_get(const struct net *net, const struct nft_set *set,
const struct nft_set_elem *elem, unsigned int flags)
{
struct nft_rbtree *priv = nft_set_priv(set);
struct nft_array *array = rcu_dereference(priv->array);
const struct nft_array_interval *interval;
struct nft_array_get_ctx ctx = {
.key = (const u32 *)&elem->key.val,
.flags = flags,
.klen = set->klen,
};
struct nft_rbtree_elem *rbe;
if (!array)
return ERR_PTR(-ENOENT);
interval = bsearch(&ctx, array->intervals, array->num_intervals,
sizeof(struct nft_array_interval), nft_array_get_cmp);
if (!interval || nft_set_elem_expired(interval->from))
return ERR_PTR(-ENOENT);
if (flags & NFT_SET_ELEM_INTERVAL_END)
rbe = container_of(interval->to, struct nft_rbtree_elem, ext);
else
rbe = container_of(interval->from, struct nft_rbtree_elem, ext);
return &rbe->priv;
}
static void nft_rbtree_gc_elem_remove(struct net *net, struct nft_set *set,
struct nft_rbtree *priv,
struct nft_rbtree_elem *rbe)