net: increase SOMAXCONN to 4096

SOMAXCONN is /proc/sys/net/core/somaxconn default value.

It has been defined as 128 more than 20 years ago.

Since it caps the listen() backlog values, the very small value has
caused numerous problems over the years, and many people had
to raise it on their hosts after beeing hit by problems.

Google has been using 1024 for at least 15 years, and we increased
this to 4096 after TCP listener rework has been completed, more than
4 years ago. We got no complain of this change breaking any
legacy application.

Many applications indeed setup a TCP listener with listen(fd, -1);
meaning they let the system select the backlog.

Raising SOMAXCONN lowers chance of the port being unavailable under
even small SYNFLOOD attack, and reduces possibilities of side channel
vulnerabilities.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Yue Cao <ycao009@ucr.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 49e95f438ed7571a93bceffdc17846c35dd64fca..0e6653471c0eacdd713df9c9ea65bb393c43bc57 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -207,8 +207,8 @@ TCP variables:
 
 somaxconn - INTEGER
        Limit of socket listen() backlog, known in userspace as SOMAXCONN.
-       Defaults to 128.  See also tcp_max_syn_backlog for additional tuning
-       for TCP sockets.
+       Defaults to 4096. (Was 128 before linux-5.4)
+       See also tcp_max_syn_backlog for additional tuning for TCP sockets.
 
 tcp_abort_on_overflow - BOOLEAN
        If listening service is too slow to accept new connections,

diff --git a/include/linux/socket.h b/include/linux/socket.h
index fc0bed59fc84ef8e6631d3c275853d52a46f84aa..4049d9755cf198bdda600a61485b36a888b9d879 100644 (file)
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -263,7 +263,7 @@ struct ucred {
 #define PF_MAX         AF_MAX
 
 /* Maximum queue length specifiable by listen.  */
-#define SOMAXCONN      128
+#define SOMAXCONN      4096
 
 /* Flags we can use with send/ and recv.
    Added those for 1003.1g not all are supported yet