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authorWillem de Bruijn <willemb@google.com>2018-09-09 19:12:12 -0400
committerDavid S. Miller <davem@davemloft.net>2018-09-11 23:34:20 -0700
commit0297c1c2eadb5bd996a873b87597af3b91c0d4ba (patch)
tree66398fef2588f20e0fad2083b18465089995bb0a /net/ipv4/tcp_input.c
parentMIPS: lantiq: dma: add dev pointer (diff)
downloadlinux-dev-0297c1c2eadb5bd996a873b87597af3b91c0d4ba.tar.xz
linux-dev-0297c1c2eadb5bd996a873b87597af3b91c0d4ba.zip
tcp: rate limit synflood warnings further
Convert pr_info to net_info_ratelimited to limit the total number of synflood warnings. Commit 946cedccbd73 ("tcp: Change possible SYN flooding messages") rate limits synflood warnings to one per listener. Workloads that open many listener sockets can still see a high rate of log messages. Syzkaller is one frequent example. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r--net/ipv4/tcp_input.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4c2dd9f863f7..4cf2f7bb2802 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6367,8 +6367,8 @@ static bool tcp_syn_flood_action(const struct sock *sk,
if (!queue->synflood_warned &&
net->ipv4.sysctl_tcp_syncookies != 2 &&
xchg(&queue->synflood_warned, 1) == 0)
- pr_info("%s: Possible SYN flooding on port %d. %s. Check SNMP counters.\n",
- proto, ntohs(tcp_hdr(skb)->dest), msg);
+ net_info_ratelimited("%s: Possible SYN flooding on port %d. %s. Check SNMP counters.\n",
+ proto, ntohs(tcp_hdr(skb)->dest), msg);
return want_cookie;
}