Message-ID: <20231226153013.3262346-1-idosch@nvidia.com>
Date: Tue, 26 Dec 2023 17:30:13 +0200
From: Ido Schimmel <idosch@...dia.com>
To: <netdev@...r.kernel.org>
CC: <dsahern@...il.com>, <stephen@...workplumber.org>, <razor@...ckwall.org>,
	<petrm@...dia.com>, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH iproute2-next] bridge: mdb: Add flush support

Implement MDB flush functionality, allowing user space to flush MDB
entries from the kernel according to provided parameters.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 bridge/mdb.c      | 137 +++++++++++++++++++++++++++++++++++++++++++++-
 man/man8/bridge.8 |  67 +++++++++++++++++++++++
 2 files changed, 203 insertions(+), 1 deletion(-)

diff --git a/bridge/mdb.c b/bridge/mdb.c
index dc8007914a37..196363a5c829 100644
--- a/bridge/mdb.c
+++ b/bridge/mdb.c
@@ -37,7 +37,9 @@ static void usage(void)
 		"              [ filter_mode { include | exclude } ] [ source_list SOURCE_LIST ] [ proto PROTO ] [ dst IPADDR ]\n"
 		"              [ dst_port DST_PORT ] [ vni VNI ] [ src_vni SRC_VNI ] [ via DEV ]\n"
 		"       bridge mdb {show} [ dev DEV ] [ vid VID ]\n"
-		"       bridge mdb get dev DEV grp GROUP [ src SOURCE ] [ vid VID ] [ src_vni SRC_VNI ]\n");
+		"       bridge mdb get dev DEV grp GROUP [ src SOURCE ] [ vid VID ] [ src_vni SRC_VNI ]\n"
+		"       bridge mdb flush dev DEV [ port PORT ] [ vid VID ] [ src_vni SRC_VNI ] [ proto PROTO ]\n"
+		"              [ [no]permanent ] [ dst IPADDR ] [ dst_port DST_PORT ] [ vni VNI ]\n");
 	exit(-1);
 }
 
@@ -943,6 +945,137 @@ static int mdb_get(int argc, char **argv)
 	return ret;
 }
 
+static int mdb_flush(int argc, char **argv)
+{
+	struct {
+		struct nlmsghdr	n;
+		struct br_port_msg	bpm;
+		char			buf[1024];
+	} req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct br_port_msg)),
+		.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_BULK,
+		.n.nlmsg_type = RTM_DELMDB,
+		.bpm.family = PF_BRIDGE,
+	};
+	char *d = NULL, *p = NULL, *src_vni = NULL, *proto = NULL, *dst = NULL;
+	char *dst_port = NULL, *vni = NULL;
+	struct br_mdb_entry entry = {};
+	unsigned short state_mask = 0;
+	bool set_attrs = false;
+	short vid = 0;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			d = *argv;
+		} else if (strcmp(*argv, "port") == 0) {
+			NEXT_ARG();
+			p = *argv;
+		} else if (strcmp(*argv, "vid") == 0) {
+			NEXT_ARG();
+			vid = atoi(*argv);
+		} else if (strcmp(*argv, "src_vni") == 0) {
+			NEXT_ARG();
+			src_vni = *argv;
+			set_attrs = true;
+		} else if (strcmp(*argv, "proto") == 0) {
+			NEXT_ARG();
+			proto = *argv;
+			set_attrs = true;
+		} else if (strcmp(*argv, "permanent") == 0) {
+			entry.state |= MDB_PERMANENT;
+			state_mask |= MDB_PERMANENT;
+			set_attrs = true;
+		} else if (strcmp(*argv, "nopermanent") == 0) {
+			entry.state &= ~MDB_PERMANENT;
+			state_mask |= MDB_PERMANENT;
+			set_attrs = true;
+		} else if (strcmp(*argv, "dst") == 0) {
+			NEXT_ARG();
+			dst = *argv;
+			set_attrs = true;
+		} else if (strcmp(*argv, "dst_port") == 0) {
+			NEXT_ARG();
+			dst_port = *argv;
+			set_attrs = true;
+		} else if (strcmp(*argv, "vni") == 0) {
+			NEXT_ARG();
+			vni = *argv;
+			set_attrs = true;
+		} else {
+			if (strcmp(*argv, "help") == 0)
+				usage();
+		}
+		argc--; argv++;
+	}
+
+	if (d == NULL) {
+		fprintf(stderr, "Device is a required argument.\n");
+		return -1;
+	}
+
+	req.bpm.ifindex = ll_name_to_index(d);
+	if (!req.bpm.ifindex)
+		return nodev(d);
+
+	if (p) {
+		entry.ifindex = ll_name_to_index(p);
+		if (!entry.ifindex)
+			return nodev(p);
+	}
+
+	entry.vid = vid;
+	addattr_l(&req.n, sizeof(req), MDBA_SET_ENTRY, &entry, sizeof(entry));
+	if (set_attrs) {
+		struct rtattr *nest = addattr_nest(&req.n, sizeof(req),
+						   MDBA_SET_ENTRY_ATTRS);
+
+		nest->rta_type |= NLA_F_NESTED;
+
+		if (proto && mdb_parse_proto(&req.n, sizeof(req), proto)) {
+			fprintf(stderr, "Invalid protocol value \"%s\"\n",
+				proto);
+			return -1;
+		}
+
+		if (dst && mdb_parse_dst(&req.n, sizeof(req), dst)) {
+			fprintf(stderr, "Invalid underlay destination address \"%s\"\n",
+				dst);
+			return -1;
+		}
+
+		if (dst_port && mdb_parse_dst_port(&req.n, sizeof(req),
+						   dst_port)) {
+			fprintf(stderr, "Invalid destination port \"%s\"\n", dst_port);
+			return -1;
+		}
+
+		if (vni && mdb_parse_vni(&req.n, sizeof(req), vni,
+					 MDBE_ATTR_VNI)) {
+			fprintf(stderr, "Invalid destination VNI \"%s\"\n",
+				vni);
+			return -1;
+		}
+
+		if (src_vni && mdb_parse_vni(&req.n, sizeof(req), src_vni,
+					     MDBE_ATTR_SRC_VNI)) {
+			fprintf(stderr, "Invalid source VNI \"%s\"\n", src_vni);
+			return -1;
+		}
+
+		if (state_mask)
+			addattr8(&req.n, sizeof(req), MDBE_ATTR_STATE_MASK,
+				 state_mask);
+
+		addattr_nest_end(&req.n, nest);
+	}
+
+	if (rtnl_talk(&rth, &req.n, NULL) < 0)
+		return -1;
+
+	return 0;
+}
+
 int do_mdb(int argc, char **argv)
 {
 	ll_init_map(&rth);
@@ -962,6 +1095,8 @@ int do_mdb(int argc, char **argv)
 			return mdb_show(argc-1, argv+1);
 		if (strcmp(*argv, "get") == 0)
 			return mdb_get(argc-1, argv+1);
+		if (strcmp(*argv, "flush") == 0)
+			return mdb_flush(argc-1, argv+1);
 		if (matches(*argv, "help") == 0)
 			usage();
 	} else
diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
index a60964bb614c..eeea407320cd 100644
--- a/man/man8/bridge.8
+++ b/man/man8/bridge.8
@@ -187,6 +187,25 @@ bridge \- show / manipulate bridge addresses and devices
 .RB "[ " src_vni
 .IR SRC_VNI " ]"
 
+.ti -8
+.B "bridge mdb flush"
+.BI dev " DEV "
+.RB "[ " port
+.IR PORT " ]"
+.RB "[ " vid
+.IR VID " ]"
+.RB "[ " src_vni
+.IR SRC_VNI " ]"
+.RB "[ " proto
+.IR PROTO " ]"
+.RB "[ " [no]permanent " ]"
+.RB "[ " dst
+.IR IPADDR " ]"
+.RB "[ " dst_port
+.IR DST_PORT " ]"
+.RB "[ " vni
+.IR VNI " ]"
+
 .ti -8
 .BR "bridge vlan" " { " add " | " del " } "
 .B dev
@@ -1172,6 +1191,54 @@ the VLAN ID. Only relevant when the bridge is VLAN-aware.
 the source VNI Network Identifier. Only relevant when the VXLAN device is in
 external mode.
 
+.SS bridge mdb flush - flush multicast group database entries.
+
+This command flushes the matching multicast group database entries.
+
+.TP
+.BI dev " DEV"
+the interface where this group address is associated.
+
+.TP
+.BI port " PORT"
+the target port for the operation. If the bridge device is specified then only
+entries pointing to the bridge itself will be deleted.
+
+.TP
+.BI vid " VID"
+the VLAN ID for the operation. Match entries only with the specified VLAN ID.
+
+.TP
+.BI src_vni " SRC_VNI"
+the source VNI Network Identifier for the operation. Match entries only with
+the specified source VNI.
+
+.TP
+.BI proto " PROTO"
+the routing protocol identifier for the operation. Match entries only with the
+specified routing protocol. Can be a number or a string from the file
+/etc/iproute2/rt_protos.
+
+.TP
+.B [no]permanent
+if specified then only permanent entries will be deleted or respectively if
+"no" is prepended then only non-permanent (temp) entries will be deleted.
+
+.TP
+.BI dst " IPADDR"
+the IP address of the destination VXLAN tunnel endpoint where the multicast
+receivers reside. Match entries only with the specified destination IP.
+
+.TP
+.BI dst_port " DST_PORT"
+the UDP destination port number to use to connect to the remote VXLAN tunnel
+endpoint. Match entries only with the specified destination port number.
+
+.TP
+.BI vni " VNI"
+the VXLAN VNI Network Identifier to use to connect to the remote VXLAN tunnel
+endpoint. Match entries only with the specified destination VNI.
+
 .SH bridge vlan - VLAN filter list
 
 .B vlan
-- 
2.40.1

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