In some scenarios, it is necessary to know the count of syn
packages sent and syn packages received in order to assist in
troubleshooting issues.
Signed-off-by: lwk <lwk111111@126.com>
modified: include/uapi/linux/snmp.h
modified: net/ipv4/proc.c
modified: net/ipv4/tcp_input.c
modified: net/ipv4/tcp_output.c
---
include/uapi/linux/snmp.h | 2 ++
net/ipv4/proc.c | 2 ++
net/ipv4/tcp_input.c | 1 +
net/ipv4/tcp_output.c | 1 +
4 files changed, 6 insertions(+)
diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h
index 848c778..3ebf80d 100644
--- a/include/uapi/linux/snmp.h
+++ b/include/uapi/linux/snmp.h
@@ -303,6 +303,8 @@ enum
LINUX_MIB_TCPAOKEYNOTFOUND, /* TCPAOKeyNotFound */
LINUX_MIB_TCPAOGOOD, /* TCPAOGood */
LINUX_MIB_TCPAODROPPEDICMPS, /* TCPAODroppedIcmps */
+ LINUX_MIB_TCPSYNSEND, /* TCPSynSend */
+ LINUX_MIB_TCPSYNRECV, /* TCPSynRecv */
__LINUX_MIB_MAX
};
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index affd21a..1fb7755 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -306,6 +306,8 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
SNMP_MIB_ITEM("TCPAOKeyNotFound", LINUX_MIB_TCPAOKEYNOTFOUND),
SNMP_MIB_ITEM("TCPAOGood", LINUX_MIB_TCPAOGOOD),
SNMP_MIB_ITEM("TCPAODroppedIcmps", LINUX_MIB_TCPAODROPPEDICMPS),
+ SNMP_MIB_ITEM("TCPSynSend", LINUX_MIB_TCPSYNSEND),
+ SNMP_MIB_ITEM("TCPSynRecv", LINUX_MIB_TCPSYNRECV),
SNMP_MIB_SENTINEL
};
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 0cbf81b..a77bf35 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6781,6 +6781,7 @@ enum skb_drop_reason
icsk->icsk_af_ops->conn_request(sk, skb);
local_bh_enable();
rcu_read_unlock();
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNRECV);
consume_skb(skb);
return 0;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index bc95d2a..821aa63 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -4143,6 +4143,7 @@ int tcp_connect(struct sock *sk)
tcp_connect_queue_skb(sk, buff);
tcp_ecn_send_syn(sk, buff);
tcp_rbtree_insert(&sk->tcp_rtx_queue, buff);
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNSEND);
/* Send off SYN; include data in Fast Open. */
err = tp->fastopen_req ? tcp_send_syn_data(sk, buff) :
--
1.8.3.1