selftests: Move address validation in nettest

IPv6 addresses can have a device name to declare a scope (e.g.,
fe80::5054:ff:fe12:3456%eth0). The next patch adds support to
switch network namespace before running client or server code
(or both), so move the address validation to the server and
client functions.

IPv4 multicast groups do not have the device scope in the address
specification, so they can be validated inline with option parsing.
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/nettest.c

@@ -43,12 +43,14 @@
 
 struct sock_args {
 	/* local address */
+	const char *local_addr_str;
 	union {
 		struct in_addr  in;
 		struct in6_addr in6;
 	} local_addr;
 
 	/* remote address */
+	const char *remote_addr_str;
 	union {
 		struct in_addr  in;
 		struct in6_addr in6;
@@ -77,6 +79,7 @@ struct sock_args {
 
 	const char *password;
 	/* prefix for MD5 password */
+	const char *md5_prefix_str;
 	union {
 		struct sockaddr_in v4;
 		struct sockaddr_in6 v6;
@@ -88,12 +91,14 @@ struct sock_args {
 	int expected_ifindex;
 
 	/* local address */
+	const char *expected_laddr_str;
 	union {
 		struct in_addr  in;
 		struct in6_addr in6;
 	} expected_laddr;
 
 	/* remote address */
+	const char *expected_raddr_str;
 	union {
 		struct in_addr  in;
 		struct in6_addr in6;
@@ -753,6 +758,34 @@ static int convert_addr(struct sock_args *args, const char *_str,
 	return rc;
 }
 
+static int validate_addresses(struct sock_args *args)
+{
+	if (args->local_addr_str &&
+	    convert_addr(args, args->local_addr_str, ADDR_TYPE_LOCAL) < 0)
+		return 1;
+
+	if (args->remote_addr_str &&
+	    convert_addr(args, args->remote_addr_str, ADDR_TYPE_REMOTE) < 0)
+		return 1;
+
+	if (args->md5_prefix_str &&
+	    convert_addr(args, args->md5_prefix_str,
+			 ADDR_TYPE_MD5_PREFIX) < 0)
+		return 1;
+
+	if (args->expected_laddr_str &&
+	    convert_addr(args, args->expected_laddr_str,
+			 ADDR_TYPE_EXPECTED_LOCAL))
+		return 1;
+
+	if (args->expected_raddr_str &&
+	    convert_addr(args, args->expected_raddr_str,
+			 ADDR_TYPE_EXPECTED_REMOTE))
+		return 1;
+
+	return 0;
+}
+
 static int get_index_from_cmsg(struct msghdr *m)
 {
 	struct cmsghdr *cm;
@@ -1344,7 +1377,7 @@ static int do_server(struct sock_args *args)
 	fd_set rfds;
 	int rc;
 
-	if (resolve_devices(args))
+	if (resolve_devices(args) || validate_addresses(args))
 		return 1;
 
 	if (prog_timeout)
@@ -1532,7 +1565,7 @@ static int do_client(struct sock_args *args)
 		return 1;
 	}
 
-	if (resolve_devices(args))
+	if (resolve_devices(args) || validate_addresses(args))
 		return 1;
 
 	if ((args->use_setsockopt || args->use_cmsg) && !args->ifindex) {
@@ -1680,13 +1713,11 @@ int main(int argc, char *argv[])
 			break;
 		case 'l':
 			args.has_local_ip = 1;
-			if (convert_addr(&args, optarg, ADDR_TYPE_LOCAL) < 0)
-				return 1;
+			args.local_addr_str = optarg;
 			break;
 		case 'r':
 			args.has_remote_ip = 1;
-			if (convert_addr(&args, optarg, ADDR_TYPE_REMOTE) < 0)
-				return 1;
+			args.remote_addr_str = optarg;
 			break;
 		case 'p':
 			if (str_to_uint(optarg, 1, 65535, &tmp) != 0) {
@@ -1733,8 +1764,7 @@ int main(int argc, char *argv[])
 			args.password = optarg;
 			break;
 		case 'm':
-			if (convert_addr(&args, optarg, ADDR_TYPE_MD5_PREFIX) < 0)
-				return 1;
+			args.md5_prefix_str = optarg;
 			break;
 		case 'S':
 			args.use_setsockopt = 1;
@@ -1762,16 +1792,11 @@ int main(int argc, char *argv[])
 			break;
 		case '0':
 			args.has_expected_laddr = 1;
-			if (convert_addr(&args, optarg,
-					 ADDR_TYPE_EXPECTED_LOCAL))
-				return 1;
+			args.expected_laddr_str = optarg;
 			break;
 		case '1':
 			args.has_expected_raddr = 1;
-			if (convert_addr(&args, optarg,
-					 ADDR_TYPE_EXPECTED_REMOTE))
-				return 1;
-
+			args.expected_raddr_str = optarg;
 			break;
 		case '2':
 			args.expected_dev = optarg;
@@ -1786,12 +1811,13 @@ int main(int argc, char *argv[])
 	}
 
 	if (args.password &&
-	    ((!args.has_remote_ip && !args.prefix_len) || args.type != SOCK_STREAM)) {
+	    ((!args.has_remote_ip && !args.md5_prefix_str) ||
+	      args.type != SOCK_STREAM)) {
 		log_error("MD5 passwords apply to TCP only and require a remote ip for the password\n");
 		return 1;
 	}
 
-	if (args.prefix_len && !args.password) {
+	if (args.md5_prefix_str && !args.password) {
 		log_error("Prefix range for MD5 protection specified without a password\n");
 		return 1;
 	}