From: "Linus Lüssing" <linus.luessing@c0d3.blue> To: netfilter-devel@vger.kernel.org Cc: "Pablo Neira Ayuso" <pablo@netfilter.org>, "Jozsef Kadlecsik" <kadlec@blackhole.kfki.hu>, "Florian Westphal" <fw@strlen.de>, "Stephen Hemminger" <stephen@networkplumber.org>, "David S . Miller" <davem@davemloft.net>, coreteam@netfilter.org, bridge@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "Linus Lüssing" <linus.luessing@c0d3.blue> Subject: [PATCH net-next] bridge: ebtables: Avoid resetting limit rule state Date: Sat, 25 Nov 2017 08:44:18 +0100 [thread overview] Message-ID: <20171125074418.16537-1-linus.luessing@c0d3.blue> (raw) So far any changes with ebtables will reset the state of limit rules, leading to spikes in traffic. This is especially noticeable if changes are done frequently, for instance via a daemon. This patch fixes this by bailing out from (re)setting if the limit rule was initialized before. When sending packets every 250ms for 600s, with a "--limit 1/sec --limit-burst 50" rule and a command like this in the background: $ ebtables -N VOIDCHAIN $ while true; do ebtables -F VOIDCHAIN; sleep 30; done The results are: Before: ~1600 packets After: 650 packets Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> --- net/bridge/netfilter/ebt_limit.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/bridge/netfilter/ebt_limit.c b/net/bridge/netfilter/ebt_limit.c index 61a9f1be1263..f74b48633feb 100644 --- a/net/bridge/netfilter/ebt_limit.c +++ b/net/bridge/netfilter/ebt_limit.c @@ -69,6 +69,10 @@ static int ebt_limit_mt_check(const struct xt_mtchk_param *par) { struct ebt_limit_info *info = par->matchinfo; + /* Do not reset state on unrelated table changes */ + if (info->prev) + return 0; + /* Check for overflow. */ if (info->burst == 0 || user2credits(info->avg * info->burst) < user2credits(info->avg)) { -- 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: "Linus Lüssing" <linus.luessing@c0d3.blue> To: netfilter-devel@vger.kernel.org Cc: netdev@vger.kernel.org, bridge@lists.linux-foundation.org, Florian Westphal <fw@strlen.de>, linux-kernel@vger.kernel.org, coreteam@netfilter.org, Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>, "David S . Miller" <davem@davemloft.net>, Pablo Neira Ayuso <pablo@netfilter.org> Subject: [Bridge] [PATCH net-next] bridge: ebtables: Avoid resetting limit rule state Date: Sat, 25 Nov 2017 08:44:18 +0100 [thread overview] Message-ID: <20171125074418.16537-1-linus.luessing@c0d3.blue> (raw) So far any changes with ebtables will reset the state of limit rules, leading to spikes in traffic. This is especially noticeable if changes are done frequently, for instance via a daemon. This patch fixes this by bailing out from (re)setting if the limit rule was initialized before. When sending packets every 250ms for 600s, with a "--limit 1/sec --limit-burst 50" rule and a command like this in the background: $ ebtables -N VOIDCHAIN $ while true; do ebtables -F VOIDCHAIN; sleep 30; done The results are: Before: ~1600 packets After: 650 packets Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> --- net/bridge/netfilter/ebt_limit.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/bridge/netfilter/ebt_limit.c b/net/bridge/netfilter/ebt_limit.c index 61a9f1be1263..f74b48633feb 100644 --- a/net/bridge/netfilter/ebt_limit.c +++ b/net/bridge/netfilter/ebt_limit.c @@ -69,6 +69,10 @@ static int ebt_limit_mt_check(const struct xt_mtchk_param *par) { struct ebt_limit_info *info = par->matchinfo; + /* Do not reset state on unrelated table changes */ + if (info->prev) + return 0; + /* Check for overflow. */ if (info->burst == 0 || user2credits(info->avg * info->burst) < user2credits(info->avg)) { -- 2.11.0
next reply other threads:[~2017-11-25 7:44 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-11-25 7:44 Linus Lüssing [this message] 2017-11-25 7:44 ` [Bridge] [PATCH net-next] bridge: ebtables: Avoid resetting limit rule state Linus Lüssing 2017-11-27 23:30 ` Pablo Neira Ayuso 2017-11-27 23:30 ` [Bridge] " Pablo Neira Ayuso 2017-12-04 4:53 ` Linus Lüssing 2017-12-04 4:53 ` [Bridge] " Linus Lüssing 2017-12-04 4:53 ` Linus Lüssing 2017-12-04 5:20 ` [Bridge] " Linus Lüssing 2017-12-04 10:13 ` Pablo Neira Ayuso 2017-12-07 0:26 ` Pablo Neira Ayuso 2017-12-07 0:26 ` [Bridge] " Pablo Neira Ayuso 2017-12-07 0:26 ` Pablo Neira Ayuso 2017-12-08 5:46 ` Linus Lüssing 2017-12-08 5:46 ` [Bridge] " Linus Lüssing 2017-12-08 5:49 ` Linus Lüssing 2017-12-08 5:49 ` [Bridge] " Linus Lüssing 2017-12-08 5:49 ` Linus Lüssing
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