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netfilter: nft_compat: remove flush counter optimization 

commit 2f941622fd upstream.

WARNING: CPU: 1 PID: 16059 at lib/refcount.c:31 refcount_warn_saturate+0xdf/0xf
[..]
 __nft_mt_tg_destroy+0x42/0x50 [nft_compat]
 nft_target_destroy+0x63/0x80 [nft_compat]
 nf_tables_expr_destroy+0x1b/0x30 [nf_tables]
 nf_tables_rule_destroy+0x3a/0x70 [nf_tables]
 nf_tables_exit_net+0x186/0x3d0 [nf_tables]

Happens when a compat expr is destoyed from abort path.
There is no functional impact; after this work queue is flushed
unconditionally if its pending.

This removes the waitcount optimization.  Test of repeated
iptables-restore of a ~60k kubernetes ruleset doesn't indicate
a slowdown.  In case the counter is needed after all for some workloads
we can revert this and increment the refcount for the
!= NFT_PREPARE_TRANS case to avoid the increment/decrement imbalance.

While at it, also flush for match case, this was an oversight
in the original patch.

Fixes: ffe8923f10 ("netfilter: nft_compat: make sure xtables destructors have run")
Reported-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Florian Westphal 2020-08-09 20:28:01 +02:00 committed by Greg Kroah-Hartman
parent 9351148633
commit 516bd00e5a
1 changed files with 14 additions and 23 deletions
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37
net/netfilter/nft_compat.c
View File

@ -27,8 +27,6 @@ struct nft_xt_match_priv {
void *info;
};
static refcount_t nft_compat_pending_destroy = REFCOUNT_INIT(1);
static int nft_compat_chain_validate_dependency(const struct nft_ctx *ctx,
const char *tablename)
{
@ -215,6 +213,17 @@ static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv)
return 0;
}
static void nft_compat_wait_for_destructors(void)
{
/* xtables matches or targets can have side effects, e.g.
* creation/destruction of /proc files.
* The xt ->destroy functions are run asynchronously from
* work queue. If we have pending invocations we thus
* need to wait for those to finish.
*/
nf_tables_trans_destroy_flush_work();
}
static int
nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
const struct nlattr * const tb[])
@ -238,14 +247,7 @@ nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
/* xtables matches or targets can have side effects, e.g.
* creation/destruction of /proc files.
* The xt ->destroy functions are run asynchronously from
* work queue. If we have pending invocations we thus
* need to wait for those to finish.
*/
if (refcount_read(&nft_compat_pending_destroy) > 1)
nf_tables_trans_destroy_flush_work();
nft_compat_wait_for_destructors();
ret = xt_check_target(&par, size, proto, inv);
if (ret < 0)
@ -260,7 +262,6 @@ nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
static void __nft_mt_tg_destroy(struct module *me, const struct nft_expr *expr)
{
refcount_dec(&nft_compat_pending_destroy);
module_put(me);
kfree(expr->ops);
}
@ -468,6 +469,8 @@ __nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
nft_compat_wait_for_destructors();
return xt_check_match(&par, size, proto, inv);
}
@ -716,14 +719,6 @@ static const struct nfnetlink_subsystem nfnl_compat_subsys = {
static struct nft_expr_type nft_match_type;
static void nft_mt_tg_deactivate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
enum nft_trans_phase phase)
{
if (phase == NFT_TRANS_COMMIT)
refcount_inc(&nft_compat_pending_destroy);
}
static const struct nft_expr_ops *
nft_match_select_ops(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
@ -762,7 +757,6 @@ nft_match_select_ops(const struct nft_ctx *ctx,
ops->type = &nft_match_type;
ops->eval = nft_match_eval;
ops->init = nft_match_init;
ops->deactivate = nft_mt_tg_deactivate,
ops->destroy = nft_match_destroy;
ops->dump = nft_match_dump;
ops->validate = nft_match_validate;
@ -853,7 +847,6 @@ nft_target_select_ops(const struct nft_ctx *ctx,
ops->size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize));
ops->init = nft_target_init;
ops->destroy = nft_target_destroy;
ops->deactivate = nft_mt_tg_deactivate,
ops->dump = nft_target_dump;
ops->validate = nft_target_validate;
ops->data = target;
@ -917,8 +910,6 @@ static void __exit nft_compat_module_exit(void)
nfnetlink_subsys_unregister(&nfnl_compat_subsys);
nft_unregister_expr(&nft_target_type);
nft_unregister_expr(&nft_match_type);
WARN_ON_ONCE(refcount_read(&nft_compat_pending_destroy) != 1);
}
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);