netdev - [PATCH iproute2-next 5/8] bridge: fdb: support match on destination port in flush command

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Message-ID: <20231017070227.3560105-6-amcohen@nvidia.com>
Date: Tue, 17 Oct 2023 10:02:24 +0300
From: Amit Cohen <amcohen@...dia.com>
To: <netdev@...r.kernel.org>
CC: <dsahern@...il.com>, <stephen@...workplumber.org>, <razor@...ckwall.org>,
	<mlxsw@...dia.com>, <roopa@...dia.com>, Amit Cohen <amcohen@...dia.com>
Subject: [PATCH iproute2-next 5/8] bridge: fdb: support match on destination port in flush command

Extend "fdb flush" command to match fdb entries with a specific destination
port.

Example:
$ bridge fdb flush dev vx10 port 1111
This will flush all fdb entries pointing to vx10 with destination port
1111.

Signed-off-by: Amit Cohen <amcohen@...dia.com>
---
 bridge/fdb.c      | 21 ++++++++++++++++++++-
 man/man8/bridge.8 |  8 ++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/bridge/fdb.c b/bridge/fdb.c
index 69f0d9e4..d9665bd5 100644
--- a/bridge/fdb.c
+++ b/bridge/fdb.c
@@ -46,7 +46,7 @@ static void usage(void)
 		"       bridge fdb get [ to ] LLADDR [ br BRDEV ] { brport | dev } DEV\n"
 		"              [ vlan VID ] [ vni VNI ] [ self ] [ master ] [ dynamic ]\n"
 		"       bridge fdb flush dev DEV [ brport DEV ] [ vlan VID ] [ src_vni VNI ]\n"
-		"              [ nhid NHID ] [ vni VNI ] [ self ] [ master ]\n"
+		"              [ nhid NHID ] [ vni VNI ] [ port PORT ] [ self ] [ master ]\n"
 		"	       [ [no]permanent | [no]static | [no]dynamic ]\n"
 		"              [ [no]added_by_user ] [ [no]extern_learn ] [ [no]sticky ]\n"
 		"              [ [no]offloaded ]\n");
@@ -703,6 +703,7 @@ static int fdb_flush(int argc, char **argv)
 	unsigned short ndm_state = 0;
 	unsigned long src_vni = ~0;
 	unsigned long vni = ~0;
+	unsigned long port = 0;
 	__u32 nhid = 0;
 	char *endptr;
 
@@ -782,6 +783,18 @@ static int fdb_flush(int argc, char **argv)
 			if ((endptr && *endptr) ||
 			    (vni >> 24) || vni == ULONG_MAX)
 				invarg("invalid VNI\n", *argv);
+		} else if (strcmp(*argv, "port") == 0) {
+			NEXT_ARG();
+			port = strtoul(*argv, &endptr, 0);
+			if (endptr && *endptr) {
+				struct servent *pse;
+
+				pse = getservbyname(*argv, "udp");
+				if (!pse)
+					invarg("invalid port\n", *argv);
+				port = ntohs(pse->s_port);
+			} else if (port > 0xffff)
+				invarg("invalid port\n", *argv);
 		} else if (strcmp(*argv, "help") == 0) {
 			NEXT_ARG();
 		} else {
@@ -834,6 +847,12 @@ static int fdb_flush(int argc, char **argv)
 		addattr32(&req.n, sizeof(req), NDA_NH_ID, nhid);
 	if (vni != ~0)
 		addattr32(&req.n, sizeof(req), NDA_VNI, vni);
+	if (port) {
+		unsigned short dport;
+
+		dport = htons((unsigned short)port);
+		addattr16(&req.n, sizeof(req), NDA_PORT, dport);
+	}
 	if (ndm_flags_mask)
 		addattr8(&req.n, sizeof(req), NDA_NDM_FLAGS_MASK,
 			 ndm_flags_mask);
diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
index b21d9b25..4255364d 100644
--- a/man/man8/bridge.8
+++ b/man/man8/bridge.8
@@ -134,6 +134,8 @@ bridge \- show / manipulate bridge addresses and devices
 .IR NHID " ] ["
 .B vni
 .IR VNI " ] [ "
+.B port
+.IR PORT " ] ["
 .BR self " ] [ " master " ] [ "
 .BR [no]permanent " | " [no]static " | " [no]dynamic " ] [ "
 .BR [no]added_by_user " ] [ " [no]extern_learn " ] [ "
@@ -915,6 +917,12 @@ the VXLAN VNI Network Identifier (or VXLAN Segment ID) for the operation. Match
 forwarding table entries only with the specified VNI. Valid if the referenced
 device is a VXLAN type device.
 
+.TP
+.BI port " PORT"
+the UDP destination PORT number for the operation. Match forwarding table
+entries only with the specified PORT. Valid if the referenced device is a VXLAN
+type device.
+
 .TP
 .B self
 the operation is fulfilled directly by the driver for the specified network
-- 
2.41.0