[MPTCP][PATCH net-next 05/16] mptcp: add ADD_ADDR related mibs

[Geliang Tang]

This patch added two mibs for ADD_ADDR, MPTCP_MIB_ADDADDR for receiving
of the ADD_ADDR suboption with echo-flag=0, and MPTCP_MIB_ECHOADD for
receiving the ADD_ADDR suboption with echo-flag=1.

Reviewed-by: Mat Martineau <mathew.j.martineau@xxxxxxxxxxxxxxx>
Co-developed-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Geliang Tang <geliangtang@xxxxxxxxx>
---
 net/mptcp/mib.c     | 2 ++
 net/mptcp/mib.h     | 2 ++
 net/mptcp/options.c | 7 ++++++-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/net/mptcp/mib.c b/net/mptcp/mib.c
index 056986c7a228..a33bf719ce6f 100644
--- a/net/mptcp/mib.c
+++ b/net/mptcp/mib.c
@@ -27,6 +27,8 @@ static const struct snmp_mib mptcp_snmp_list[] = {
 	SNMP_MIB_ITEM("OFOMerge", MPTCP_MIB_OFOMERGE),
 	SNMP_MIB_ITEM("NoDSSInWindow", MPTCP_MIB_NODSSWINDOW),
 	SNMP_MIB_ITEM("DuplicateData", MPTCP_MIB_DUPDATA),
+	SNMP_MIB_ITEM("AddAddr", MPTCP_MIB_ADDADDR),
+	SNMP_MIB_ITEM("EchoAdd", MPTCP_MIB_ECHOADD),
 	SNMP_MIB_SENTINEL
 };
 
diff --git a/net/mptcp/mib.h b/net/mptcp/mib.h
index 937a177729f1..cdeea3732ddf 100644
--- a/net/mptcp/mib.h
+++ b/net/mptcp/mib.h
@@ -20,6 +20,8 @@ enum linux_mptcp_mib_field {
 	MPTCP_MIB_OFOMERGE,		/* Segments merged in OoO queue */
 	MPTCP_MIB_NODSSWINDOW,		/* Segments not in MPTCP windows */
 	MPTCP_MIB_DUPDATA,		/* Segments discarded due to duplicate DSS */
+	MPTCP_MIB_ADDADDR,		/* Received ADD_ADDR with echo-flag=0 */
+	MPTCP_MIB_ECHOADD,		/* Received ADD_ADDR with echo-flag=1 */
 	__MPTCP_MIB_MAX
 };
 
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index a41996e6c6d7..171039cbe9c4 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -11,6 +11,7 @@
 #include <net/tcp.h>
 #include <net/mptcp.h>
 #include "protocol.h"
+#include "mib.h"
 
 static bool mptcp_cap_flag_sha256(u8 flags)
 {
@@ -888,8 +889,12 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
 			addr.addr6 = mp_opt.addr6;
 		}
 #endif
-		if (!mp_opt.echo)
+		if (!mp_opt.echo) {
 			mptcp_pm_add_addr_received(msk, &addr);
+			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDR);
+		} else {
+			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADD);
+		}
 		mp_opt.add_addr = 0;
 	}
 
-- 
2.17.1