From patchwork Mon Aug 22 04:54:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: CGEL X-Patchwork-Id: 12950189 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2CA2BC32774 for ; Mon, 22 Aug 2022 04:55:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231495AbiHVEzI (ORCPT ); Mon, 22 Aug 2022 00:55:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229562AbiHVEzH (ORCPT ); Mon, 22 Aug 2022 00:55:07 -0400 Received: from mail-pg1-x52d.google.com (mail-pg1-x52d.google.com [IPv6:2607:f8b0:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34037101D5; Sun, 21 Aug 2022 21:55:06 -0700 (PDT) Received: by mail-pg1-x52d.google.com with SMTP id bh13so8410887pgb.4; Sun, 21 Aug 2022 21:55:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc; bh=IszYOtnFBU1gmjy/XVRVYew1Zn5AOIACo9BduvN3ShA=; b=GSezJdPdUNYkP6hTUhOG4LgnDoVHkOi+t8oxbHsUY0OArxcfoPD1+XXOfE/rEgCt/z ft5nb8or4zgzMk8mDSs8Nc3TdZHxRw1UqmmZyWXiyqLOueihfOGjeno4V4CoWBgZft4s v/gkMFFuu1t5sxNyb4KQHtIg6mc78zQT6+Yh5DD8SkMF11UxH1j31kjldZwKWaza7IYK JFiTFABwnhza1Y3IKHLF00UPmGBV9Fckco1sKFMrnGc53wuUuV2N6tnRmGPkn9RVwXjZ Mq/GHyc85vgndIMzFr6KYAqrHrUWZNquDWMKAnQ5LJJmuwZeHPiRRffVvzAVPSPx5l+Q cyWQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=IszYOtnFBU1gmjy/XVRVYew1Zn5AOIACo9BduvN3ShA=; b=54GSYOXXUHtBztLv0xqmA8SOzeIgW/DMUW1fhsySV7VlcBsWhTd1Zi01LvrR8wSSWZ uXJj/8yH/OBD1xcAMN+kP2Ada+X6/OgVGmRYwEKwQD0+Rr59OTojgcJGAml2HSkntXuT 7GSQaiE8a5Q4XgZe2rAQF+D/W8EBi8i0AbtzmtXb9D8qgcEQYOmjFFpI9flh4a+zAhg8 Jn8/roobUvqdxzfad42gVAv9zT3cgANg8Eyko0BDeddDZ5DxxNbOZVw6UrgXgpV+CA8f mzb5WSKA0ZleUEx/Q5oxpjpQig45EwvcOT2rsGmqID0XyLlGXfBi2lUfW/mvJYdvTLvD PC5Q== X-Gm-Message-State: ACgBeo00zRa831+EzmI+t16q47j5qRZinXpIk6qdT+jLnZNVfbwZIMg1 xXvjHcy6wBeklJOg9gHrnIVs0KmtocA= X-Google-Smtp-Source: AA6agR7CkhhsI8/Sohei1svaaV9WHoklyAKV8yGDHmx964eNVKOvbFmqI7WbMYrmozqMCaAw4hraOQ== X-Received: by 2002:a65:68cd:0:b0:42a:9a57:157d with SMTP id k13-20020a6568cd000000b0042a9a57157dmr4872562pgt.426.1661144105746; Sun, 21 Aug 2022 21:55:05 -0700 (PDT) Received: from localhost.localdomain ([193.203.214.57]) by smtp.gmail.com with ESMTPSA id d19-20020a17090ad99300b001f53705ee92sm7138345pjv.6.2022.08.21.21.55.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 Aug 2022 21:55:05 -0700 (PDT) From: cgel.zte@gmail.com X-Google-Original-From: xu.xin16@zte.com.cn To: davem@davemloft.net, kuba@kernel.org, yoshfuji@linux-ipv6.org, dsahern@kernel.org Cc: netdev@vger.kernel.org, linl@vger.kernel.org, xu.xin16@zte.com.cn, Yunkai Zhang , CGEL ZTE Subject: [PATCH 1/3] ipv4: Namespaceify route/error_cost knob Date: Mon, 22 Aug 2022 04:54:57 +0000 Message-Id: <20220822045457.203708-1-xu.xin16@zte.com.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220822045310.203649-1-xu.xin16@zte.com.cn> References: <20220822045310.203649-1-xu.xin16@zte.com.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: xu xin Different netns has different requirement on the setting of error_cost sysctl which is used to limit the max frequency of sending ICMP_DEST_UNREACH packet together with error_burst. To put it simply, it refers to the minimum time interval between two consecutive ICMP_DEST_UNREACHABLE packets sent to the same peer when now is icmp-stable period not the burst case after a long calm time. Enable error_cost to be configured per network namespace. Signed-off-by: xu xin Reviewed-by: Yunkai Zhang Signed-off-by: CGEL ZTE --- include/net/netns/ipv4.h | 1 + net/ipv4/route.c | 23 +++++++++++++---------- 2 files changed, 14 insertions(+), 10 deletions(-) diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h index c7320ef356d9..319395bbad3c 100644 --- a/include/net/netns/ipv4.h +++ b/include/net/netns/ipv4.h @@ -85,6 +85,7 @@ struct netns_ipv4 { u32 ip_rt_min_pmtu; int ip_rt_mtu_expires; int ip_rt_min_advmss; + int ip_rt_error_cost; struct local_ports ip_local_ports; diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 795cbe1de912..b022ae749640 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -118,7 +118,6 @@ static int ip_rt_max_size; static int ip_rt_redirect_number __read_mostly = 9; static int ip_rt_redirect_load __read_mostly = HZ / 50; static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); -static int ip_rt_error_cost __read_mostly = HZ; static int ip_rt_error_burst __read_mostly = 5 * HZ; static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; @@ -949,6 +948,7 @@ static int ip_error(struct sk_buff *skb) SKB_DR(reason); bool send; int code; + int error_cost; if (netif_is_l3_master(skb->dev)) { dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); @@ -1002,11 +1002,13 @@ static int ip_error(struct sk_buff *skb) if (peer) { now = jiffies; peer->rate_tokens += now - peer->rate_last; + error_cost = READ_ONCE(net->ipv4.ip_rt_error_cost); + if (peer->rate_tokens > ip_rt_error_burst) peer->rate_tokens = ip_rt_error_burst; peer->rate_last = now; - if (peer->rate_tokens >= ip_rt_error_cost) - peer->rate_tokens -= ip_rt_error_cost; + if (peer->rate_tokens >= error_cost) + peer->rate_tokens -= error_cost; else send = false; inet_putpeer(peer); @@ -3535,13 +3537,6 @@ static struct ctl_table ipv4_route_table[] = { .mode = 0644, .proc_handler = proc_dointvec, }, - { - .procname = "error_cost", - .data = &ip_rt_error_cost, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec, - }, { .procname = "error_burst", .data = &ip_rt_error_burst, @@ -3590,6 +3585,13 @@ static struct ctl_table ipv4_route_netns_table[] = { .mode = 0644, .proc_handler = proc_dointvec, }, + { + .procname = "error_cost", + .data = &init_net.ipv4.ip_rt_error_cost, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, { }, }; @@ -3653,6 +3655,7 @@ static __net_init int netns_ip_rt_init(struct net *net) net->ipv4.ip_rt_min_pmtu = DEFAULT_MIN_PMTU; net->ipv4.ip_rt_mtu_expires = DEFAULT_MTU_EXPIRES; net->ipv4.ip_rt_min_advmss = DEFAULT_MIN_ADVMSS; + net->ipv4.ip_rt_error_cost = HZ; return 0; } From patchwork Mon Aug 22 04:55:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: CGEL X-Patchwork-Id: 12950190 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 942E6C32774 for ; Mon, 22 Aug 2022 04:55:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232274AbiHVEzm (ORCPT ); Mon, 22 Aug 2022 00:55:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38806 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232102AbiHVEzl (ORCPT ); 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Sun, 21 Aug 2022 21:55:39 -0700 (PDT) From: cgel.zte@gmail.com X-Google-Original-From: xu.xin16@zte.com.cn To: davem@davemloft.net, kuba@kernel.org, yoshfuji@linux-ipv6.org, dsahern@kernel.org Cc: netdev@vger.kernel.org, linl@vger.kernel.org, xu.xin16@zte.com.cn, Yunkai Zhang , CGEL ZTE Subject: [PATCH 2/3] ipv4: Namespaceify route/error_burst knob Date: Mon, 22 Aug 2022 04:55:34 +0000 Message-Id: <20220822045534.203765-1-xu.xin16@zte.com.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220822045310.203649-1-xu.xin16@zte.com.cn> References: <20220822045310.203649-1-xu.xin16@zte.com.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: xu xin Different netns has different requirement on the setting of error_burst sysctl which is used to limit the frequency of sending ICMP_DEST_UNREACH packet together with error_cost. To put it simply, if the rate of error_burst over error_cost is larger, then allowd burstly-sent ICMP_DEST_UNREACH packets after a long calm time (no dest-unreachable icmp packets) is more. Enable error_burst to be configured per network namespace. Signed-off-by: xu xin Reviewed-by: Yunkai Zhang Signed-off-by: CGEL ZTE --- include/net/netns/ipv4.h | 1 + net/ipv4/route.c | 24 +++++++++++++----------- 2 files changed, 14 insertions(+), 11 deletions(-) diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h index 319395bbad3c..03d16cf32508 100644 --- a/include/net/netns/ipv4.h +++ b/include/net/netns/ipv4.h @@ -86,6 +86,7 @@ struct netns_ipv4 { int ip_rt_mtu_expires; int ip_rt_min_advmss; int ip_rt_error_cost; + int ip_rt_error_burst; struct local_ports ip_local_ports; diff --git a/net/ipv4/route.c b/net/ipv4/route.c index b022ae749640..86fbb2b511c1 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -114,11 +114,11 @@ #define DEFAULT_MIN_PMTU (512 + 20 + 20) #define DEFAULT_MTU_EXPIRES (10 * 60 * HZ) #define DEFAULT_MIN_ADVMSS 256 +#define DEFAULT_ERROR_BURST (5 * HZ) static int ip_rt_max_size; static int ip_rt_redirect_number __read_mostly = 9; static int ip_rt_redirect_load __read_mostly = HZ / 50; static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); -static int ip_rt_error_burst __read_mostly = 5 * HZ; static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; @@ -948,7 +948,7 @@ static int ip_error(struct sk_buff *skb) SKB_DR(reason); bool send; int code; - int error_cost; + int error_cost, error_burst; if (netif_is_l3_master(skb->dev)) { dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); @@ -1003,9 +1003,10 @@ static int ip_error(struct sk_buff *skb) now = jiffies; peer->rate_tokens += now - peer->rate_last; error_cost = READ_ONCE(net->ipv4.ip_rt_error_cost); + error_burst = READ_ONCE(net->ipv4.ip_rt_error_burst); - if (peer->rate_tokens > ip_rt_error_burst) - peer->rate_tokens = ip_rt_error_burst; + if (peer->rate_tokens > error_burst) + peer->rate_tokens = error_burst; peer->rate_last = now; if (peer->rate_tokens >= error_cost) peer->rate_tokens -= error_cost; @@ -3537,13 +3538,6 @@ static struct ctl_table ipv4_route_table[] = { .mode = 0644, .proc_handler = proc_dointvec, }, - { - .procname = "error_burst", - .data = &ip_rt_error_burst, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec, - }, { .procname = "gc_elasticity", .data = &ip_rt_gc_elasticity, @@ -3592,6 +3586,13 @@ static struct ctl_table ipv4_route_netns_table[] = { .mode = 0644, .proc_handler = proc_dointvec, }, + { + .procname = "error_burst", + .data = &init_net.ipv4.ip_rt_error_burst, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, { }, }; @@ -3656,6 +3657,7 @@ static __net_init int netns_ip_rt_init(struct net *net) net->ipv4.ip_rt_mtu_expires = DEFAULT_MTU_EXPIRES; net->ipv4.ip_rt_min_advmss = DEFAULT_MIN_ADVMSS; net->ipv4.ip_rt_error_cost = HZ; + net->ipv4.ip_rt_error_burst = DEFAULT_ERROR_BURST; return 0; } From patchwork Mon Aug 22 04:56:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: CGEL X-Patchwork-Id: 12950191 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 93522C28D13 for ; Mon, 22 Aug 2022 04:56:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231937AbiHVE4d (ORCPT ); Mon, 22 Aug 2022 00:56:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39548 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229562AbiHVE4c (ORCPT ); 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Sun, 21 Aug 2022 21:56:30 -0700 (PDT) From: cgel.zte@gmail.com X-Google-Original-From: xu.xin16@zte.com.cn To: corbet@lwn.net, davem@davemloft.net, kuba@kernel.org, yoshfuji@linux-ipv6.org, dsahern@kernel.org Cc: netdev@vger.kernel.org, linl@vger.kernel.org, xu.xin16@zte.com.cn, Yunkai Zhang , CGEL ZTE Subject: [PATCH 3/3] ipv4: add documentation of two sysctls about icmp Date: Mon, 22 Aug 2022 04:56:22 +0000 Message-Id: <20220822045622.203822-1-xu.xin16@zte.com.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220822045310.203649-1-xu.xin16@zte.com.cn> References: <20220822045310.203649-1-xu.xin16@zte.com.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: xu xin Add the descriptions of the sysctls of error_cost and error_burst in Documentation/networking/ip-sysctl.rst. Signed-off-by: xu xin Reviewed-by: Yunkai Zhang Signed-off-by: CGEL ZTE --- Documentation/networking/ip-sysctl.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index 56cd4ea059b2..c113a34a4115 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -156,6 +156,23 @@ route/max_size - INTEGER From linux kernel 3.6 onwards, this is deprecated for ipv4 as route cache is no longer used. +route/error_cost - INTEGER + The minimum time interval between two consecutive ICMP-DEST- + UNREACHABLE packets allowed sent to the same peer in the stable + period. Basically, The higher its value is, the lower the general + frequency of sending ICMP DEST-UNREACHABLE packets. + + Default: HZ (one second) + +route/error_burst - INTEGER + Together with error_cost, it controls the max number of burstly + sent ICMP DEST-UNREACHABLE packets after a long calm time (no + sending ICMP DEST-UNREACHABLE). Basically, the higher the rate + of error_burst over error_cost is, the more allowed burstly sent + ICMP DEST-UNREACHABLE packets after a long calm time. + + Default: 5 * HZ + neigh/default/gc_thresh1 - INTEGER Minimum number of entries to keep. Garbage collector will not purge entries if there are fewer than this number.