Merge branch 'mptcp-improve-set-flags-command-and-update-self-tests'

Mat Martineau says:

====================
mptcp: Improve set-flags command and update self tests

Patches 1-3 allow more flexibility in the combinations of features and
flags allowed with the MPTCP_PM_CMD_SET_FLAGS netlink command, and add
self test case coverage for the new functionality.

Patches 4-6 and 9 refactor the mptcp_join.sh self tests to allow them to
configure all of the test cases using either the pm_nl_ctl utility (part
of the mptcp self tests) or the 'ip mptcp' command (from iproute2). The
default remains to use pm_nl_ctl.

Patches 7 and 8 update the pm_netlink.sh self tests to cover the use of
endpoint ids to set endpoint flags (instead of just addresses).
====================

Link: https://lore.kernel.org/r/20220205000337.187292-1-mathew.j.martineau@linux.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/mptcp/pm_netlink.c

@@ -1174,14 +1174,8 @@ skip_family:
 	if (tb[MPTCP_PM_ADDR_ATTR_FLAGS])
 		entry->flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]);
 
-	if (tb[MPTCP_PM_ADDR_ATTR_PORT]) {
-		if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
-			NL_SET_ERR_MSG_ATTR(info->extack, attr,
-					    "flags must have signal when using port");
-			return -EINVAL;
-		}
+	if (tb[MPTCP_PM_ADDR_ATTR_PORT])
 		entry->addr.port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]));
-	}
 
 	return 0;
 }
@@ -1227,6 +1221,11 @@ static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
 	if (ret < 0)
 		return ret;
 
+	if (addr.addr.port && !(addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
+		GENL_SET_ERR_MSG(info, "flags must have signal when using port");
+		return -EINVAL;
+	}
+
 	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 	if (!entry) {
 		GENL_SET_ERR_MSG(info, "can't allocate addr");

tools/testing/selftests/net/mptcp/pm_netlink.sh

@@ -164,4 +164,22 @@ id 253 flags  10.0.0.5
 id 254 flags  10.0.0.2
 id 255 flags  10.0.0.3" "wrap-around ids"
 
+ip netns exec $ns1 ./pm_nl_ctl flush
+ip netns exec $ns1 ./pm_nl_ctl add 10.0.1.1 flags subflow
+ip netns exec $ns1 ./pm_nl_ctl set 10.0.1.1 flags backup
+check "ip netns exec $ns1 ./pm_nl_ctl dump" "id 1 flags \
+subflow,backup 10.0.1.1" "set flags (backup)"
+ip netns exec $ns1 ./pm_nl_ctl set 10.0.1.1 flags nobackup
+check "ip netns exec $ns1 ./pm_nl_ctl dump" "id 1 flags \
+subflow 10.0.1.1" "          (nobackup)"
+ip netns exec $ns1 ./pm_nl_ctl set id 1 flags fullmesh
+check "ip netns exec $ns1 ./pm_nl_ctl dump" "id 1 flags \
+subflow,fullmesh 10.0.1.1" "          (fullmesh)"
+ip netns exec $ns1 ./pm_nl_ctl set id 1 flags nofullmesh
+check "ip netns exec $ns1 ./pm_nl_ctl dump" "id 1 flags \
+subflow 10.0.1.1" "          (nofullmesh)"
+ip netns exec $ns1 ./pm_nl_ctl set id 1 flags backup,fullmesh
+check "ip netns exec $ns1 ./pm_nl_ctl dump" "id 1 flags \
+subflow,backup,fullmesh 10.0.1.1" "          (backup,fullmesh)"
+
 exit $ret

tools/testing/selftests/net/mptcp/pm_nl_ctl.c

@@ -28,7 +28,7 @@ static void syntax(char *argv[])
 	fprintf(stderr, "\tadd [flags signal|subflow|backup|fullmesh] [id <nr>] [dev <name>] <ip>\n");
 	fprintf(stderr, "\tdel <id> [<ip>]\n");
 	fprintf(stderr, "\tget <id>\n");
-	fprintf(stderr, "\tset <ip> [flags backup|nobackup|fullmesh|nofullmesh]\n");
+	fprintf(stderr, "\tset [<ip>] [id <nr>] flags [no]backup|[no]fullmesh [port <nr>]\n");
 	fprintf(stderr, "\tflush\n");
 	fprintf(stderr, "\tdump\n");
 	fprintf(stderr, "\tlimits [<rcv addr max> <subflow max>]\n");
@@ -657,8 +657,10 @@ int set_flags(int fd, int pm_family, int argc, char *argv[])
 	u_int32_t flags = 0;
 	u_int16_t family;
 	int nest_start;
+	int use_id = 0;
+	u_int8_t id;
 	int off = 0;
-	int arg;
+	int arg = 2;
 
 	memset(data, 0, sizeof(data));
 	nh = (void *)data;
@@ -674,18 +676,30 @@ int set_flags(int fd, int pm_family, int argc, char *argv[])
 	nest->rta_len = RTA_LENGTH(0);
 	off += NLMSG_ALIGN(nest->rta_len);
 
+	if (!strcmp(argv[arg], "id")) {
+		if (++arg >= argc)
+			error(1, 0, " missing id value");
+
+		use_id = 1;
+		id = atoi(argv[arg]);
+		rta = (void *)(data + off);
+		rta->rta_type = MPTCP_PM_ADDR_ATTR_ID;
+		rta->rta_len = RTA_LENGTH(1);
+		memcpy(RTA_DATA(rta), &id, 1);
+		off += NLMSG_ALIGN(rta->rta_len);
+	} else {
 		/* addr data */
 		rta = (void *)(data + off);
-	if (inet_pton(AF_INET, argv[2], RTA_DATA(rta))) {
+		if (inet_pton(AF_INET, argv[arg], RTA_DATA(rta))) {
 			family = AF_INET;
 			rta->rta_type = MPTCP_PM_ADDR_ATTR_ADDR4;
 			rta->rta_len = RTA_LENGTH(4);
-	} else if (inet_pton(AF_INET6, argv[2], RTA_DATA(rta))) {
+		} else if (inet_pton(AF_INET6, argv[arg], RTA_DATA(rta))) {
 			family = AF_INET6;
 			rta->rta_type = MPTCP_PM_ADDR_ATTR_ADDR6;
 			rta->rta_len = RTA_LENGTH(16);
 		} else {
-		error(1, errno, "can't parse ip %s", argv[2]);
+			error(1, errno, "can't parse ip %s", argv[arg]);
 		}
 		off += NLMSG_ALIGN(rta->rta_len);
 
@@ -695,8 +709,12 @@ int set_flags(int fd, int pm_family, int argc, char *argv[])
 		rta->rta_len = RTA_LENGTH(2);
 		memcpy(RTA_DATA(rta), &family, 2);
 		off += NLMSG_ALIGN(rta->rta_len);
+	}
 
-	for (arg = 3; arg < argc; arg++) {
+	if (++arg >= argc)
+		error(1, 0, " missing flags keyword");
+
+	for (; arg < argc; arg++) {
 		if (!strcmp(argv[arg], "flags")) {
 			char *tok, *str;
 
@@ -721,6 +739,21 @@ int set_flags(int fd, int pm_family, int argc, char *argv[])
 			rta->rta_len = RTA_LENGTH(4);
 			memcpy(RTA_DATA(rta), &flags, 4);
 			off += NLMSG_ALIGN(rta->rta_len);
+		} else if (!strcmp(argv[arg], "port")) {
+			u_int16_t port;
+
+			if (use_id)
+				error(1, 0, " port can't be used with id");
+
+			if (++arg >= argc)
+				error(1, 0, " missing port value");
+
+			port = atoi(argv[arg]);
+			rta = (void *)(data + off);
+			rta->rta_type = MPTCP_PM_ADDR_ATTR_PORT;
+			rta->rta_len = RTA_LENGTH(2);
+			memcpy(RTA_DATA(rta), &port, 2);
+			off += NLMSG_ALIGN(rta->rta_len);
 		} else {
 			error(1, 0, "unknown keyword %s", argv[arg]);
 		}