routes: make the prefix field variable-length.

Signed-off-by: y-kzm <[email protected]>

Author: y-kzm

test/send.c

@@ -162,10 +162,11 @@ START_TEST(test_add_ra_options_route)
 	ck_assert_msg(0, "\n%s", (char*)&buf);
 #else
 	unsigned char expected[] = {
-		0x18, 0x03, 0x30, 0x18, 0x00, 0x00, 0x27, 0x10, 0xfe, 0x80, 0x00, 0x0f, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
-		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x03, 0x28, 0x08, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x80, 0x00, 0x0f,
-		0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x03, 0x20, 0x00, 0x00, 0x00,
-		0x0b, 0xb8, 0xfe, 0x80, 0x00, 0x0f, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x18, 0x02, 0x30, 0x18, 0x00, 0x00, 0x27, 0x10, 0xfe, 0x80, 0x00, 0x0f, 0x00, 0x01, 0x00, 0x00,
+		0x18, 0x02, 0x28, 0x08, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x80, 0x00, 0x0f, 0x00, 0x02, 0x00, 0x00,
+		0x18, 0x02, 0x20, 0x00, 0x00, 0x00, 0x0b, 0xb8, 0xfe, 0x80, 0x00, 0x0f, 0x00, 0x02, 0x00, 0x00,
+		0x18, 0x03, 0x80, 0x00, 0x00, 0x00, 0x0b, 0xb8, 0xfe, 0x80, 0x00, 0x0f, 0x00, 0x02, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	};
 
 	ck_assert_int_eq(sizeof(expected), sb.used);

test/test1.conf

@@ -42,6 +42,9 @@ interface eth0 {
 	route fe80:f:2::/32 {
 	};
 
+	route fe80:f:2::/128 {
+	};
+
 	DNSSL office.branch.example.com branch.example.com example.com {
 		AdvDNSSLLifetime 1000;
 	};