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Thu, 18 Apr 2024 04:02:04 -0700 (PDT) From: Alexander Mikhalitsyn To: horms@verge.net.au Cc: netdev@vger.kernel.org, lvs-devel@vger.kernel.org, netfilter-devel@vger.kernel.org, linux-kernel@vger.kernel.org, Alexander Mikhalitsyn , Julian Anastasov , Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal Subject: [PATCH net-next v2 1/2] ipvs: add READ_ONCE barrier for ipvs->sysctl_amemthresh Date: Thu, 18 Apr 2024 13:01:52 +0200 Message-Id: <20240418110153.102781-1-aleksandr.mikhalitsyn@canonical.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org Cc: Julian Anastasov Cc: Simon Horman Cc: Pablo Neira Ayuso Cc: Jozsef Kadlecsik Cc: Florian Westphal Suggested-by: Julian Anastasov Signed-off-by: Alexander Mikhalitsyn --- net/netfilter/ipvs/ip_vs_ctl.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index 143a341bbc0a..daa62b8b2dd1 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -94,6 +94,7 @@ static void update_defense_level(struct netns_ipvs *ipvs) { struct sysinfo i; int availmem; + int amemthresh; int nomem; int to_change = -1; @@ -105,7 +106,8 @@ static void update_defense_level(struct netns_ipvs *ipvs) /* si_swapinfo(&i); */ /* availmem = availmem - (i.totalswap - i.freeswap); */ - nomem = (availmem < ipvs->sysctl_amemthresh); + amemthresh = max(READ_ONCE(ipvs->sysctl_amemthresh), 0); + nomem = (availmem < amemthresh); local_bh_disable(); @@ -146,8 +148,8 @@ static void update_defense_level(struct netns_ipvs *ipvs) case 1: if (nomem) { ipvs->drop_rate = ipvs->drop_counter - = ipvs->sysctl_amemthresh / - (ipvs->sysctl_amemthresh-availmem); + = amemthresh / + (amemthresh-availmem); ipvs->sysctl_drop_packet = 2; } else { ipvs->drop_rate = 0; @@ -156,8 +158,8 @@ static void update_defense_level(struct netns_ipvs *ipvs) case 2: if (nomem) { ipvs->drop_rate = ipvs->drop_counter - = ipvs->sysctl_amemthresh / - (ipvs->sysctl_amemthresh-availmem); + = amemthresh / + (amemthresh-availmem); } else { ipvs->drop_rate = 0; ipvs->sysctl_drop_packet = 1;