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tcp: add LINUX_MIB_BEYOND_WINDOW

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Add a new SNMP MIB : LINUX_MIB_BEYOND_WINDOW

Incremented when an incoming packet is received beyond the
receiver window.

nstat -az | grep TcpExtBeyondWindow

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250711114006.480026-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2025-07-11 11:40:00 +00:00 • committed by Jakub Kicinski
parent 9ca48d616e
commit 6c758062c6
5 changed files with 5 additions and 0 deletions
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1
Documentation/networking/net_cachelines/snmp.rst
View file

@ -36,6 +36,7 @@ unsigned_long LINUX_MIB_TIMEWAITRECYCLED
unsigned_long LINUX_MIB_TIMEWAITKILLED
unsigned_long LINUX_MIB_PAWSACTIVEREJECTED
unsigned_long LINUX_MIB_PAWSESTABREJECTED
unsigned_long LINUX_MIB_BEYOND_WINDOW
unsigned_long LINUX_MIB_TSECR_REJECTED
unsigned_long LINUX_MIB_PAWS_OLD_ACK
unsigned_long LINUX_MIB_PAWS_TW_REJECTED

1
include/net/dropreason-core.h
View file

@ -309,6 +309,7 @@ enum skb_drop_reason {
/**
* @SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE:
* Not acceptable END_SEQ field.
* Corresponds to LINUX_MIB_BEYOND_WINDOW.
*/
SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE,
/**

1
include/uapi/linux/snmp.h
View file

@ -186,6 +186,7 @@ enum
LINUX_MIB_TIMEWAITKILLED, /* TimeWaitKilled */
LINUX_MIB_PAWSACTIVEREJECTED, /* PAWSActiveRejected */
LINUX_MIB_PAWSESTABREJECTED, /* PAWSEstabRejected */
LINUX_MIB_BEYOND_WINDOW, /* BeyondWindow */
LINUX_MIB_TSECRREJECTED, /* TSEcrRejected */
LINUX_MIB_PAWS_OLD_ACK, /* PAWSOldAck */
LINUX_MIB_PAWS_TW_REJECTED, /* PAWSTimewait */

1
net/ipv4/proc.c
View file

@ -189,6 +189,7 @@ static const struct snmp_mib snmp4_net_list[] = {
SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
SNMP_MIB_ITEM("BeyondWindow", LINUX_MIB_BEYOND_WINDOW),
SNMP_MIB_ITEM("TSEcrRejected", LINUX_MIB_TSECRREJECTED),
SNMP_MIB_ITEM("PAWSOldAck", LINUX_MIB_PAWS_OLD_ACK),
SNMP_MIB_ITEM("PAWSTimewait", LINUX_MIB_PAWS_TW_REJECTED),

1
net/ipv4/tcp_input.c
View file

@ -5900,6 +5900,7 @@ step1:
if (!th->rst) {
if (th->syn)
goto syn_challenge;
NET_INC_STATS(sock_net(sk), LINUX_MIB_BEYOND_WINDOW);
if (!tcp_oow_rate_limited(sock_net(sk), skb,
LINUX_MIB_TCPACKSKIPPEDSEQ,
&tp->last_oow_ack_time))