Merge pull request #11424 from mirelachirica/stack_type_ip_versions

Stack type ip versions

Author: 0xc0170

UNITTESTS/stubs/CellularUtil_stub.cpp

@@ -51,9 +51,9 @@ uint16_t char_str_to_hex(const char *str, uint16_t len, char *buf, bool omit_lea
     return CellularUtil_stub::uint16_value;
 }
 
-void convert_ipv6(char *ip)
+nsapi_version_t convert_ipv6(char *ip)
 {
-
+    return NSAPI_UNSPEC;
 }
 
 char *find_dot_number(char *str, int dot_number)

features/cellular/framework/AT/AT_CellularBase.h

@@ -60,7 +60,7 @@ class AT_CellularBase {
         PROPERTY_AT_CSDH,           // 0 = not supported, 1 = supported. Show text mode AT command
         PROPERTY_IPV4_PDP_TYPE,     // 0 = not supported, 1 = supported. Does modem support IPV4?
         PROPERTY_IPV6_PDP_TYPE,     // 0 = not supported, 1 = supported. Does modem support IPV6?
-        PROPERTY_IPV4V6_PDP_TYPE,   // 0 = not supported, 1 = supported. Does modem support dual stack IPV4V6?
+        PROPERTY_IPV4V6_PDP_TYPE,   // 0 = not supported, 1 = supported. Does modem support IPV4 and IPV6 simultaneously?
         PROPERTY_NON_IP_PDP_TYPE,   // 0 = not supported, 1 = supported. Does modem support Non-IP?
         PROPERTY_AT_CGEREP,         // 0 = not supported, 1 = supported. Does modem support AT command AT+CGEREP.
 

features/cellular/framework/AT/AT_CellularContext.cpp

@@ -369,8 +369,9 @@ bool AT_CellularContext::get_context()
                 // APN matched -> Check PDP type
                 pdp_type_t pdp_type = string_to_pdp_type(pdp_type_from_context);
 
-                // Accept exact matching PDP context type
-                if (get_property(pdp_type_t_to_cellular_property(pdp_type))) {
+                // Accept exact matching PDP context type or dual PDP context for modems that support both IPv4 and IPv6 stacks
+                if (get_property(pdp_type_t_to_cellular_property(pdp_type)) ||
+                        ((pdp_type == IPV4V6_PDP_TYPE && (get_property(PROPERTY_IPV4_PDP_TYPE) && get_property(PROPERTY_IPV6_PDP_TYPE))) && !_nonip_req)) {
                     _pdp_type = pdp_type;
                     _cid = cid;
                 }
@@ -403,7 +404,7 @@ bool AT_CellularContext::set_new_context(int cid)
     if (_nonip_req && _cp_in_use && get_property(PROPERTY_NON_IP_PDP_TYPE)) {
         strncpy(pdp_type_str, "Non-IP", sizeof(pdp_type_str));
         pdp_type = NON_IP_PDP_TYPE;
-    } else if (get_property(PROPERTY_IPV4V6_PDP_TYPE)) {
+    } else if (get_property(PROPERTY_IPV4V6_PDP_TYPE) || (get_property(PROPERTY_IPV4_PDP_TYPE) && get_property(PROPERTY_IPV6_PDP_TYPE))) {
         strncpy(pdp_type_str, "IPV4V6", sizeof(pdp_type_str));
         pdp_type = IPV4V6_PDP_TYPE;
     } else if (get_property(PROPERTY_IPV6_PDP_TYPE)) {

features/cellular/framework/AT/AT_CellularStack.cpp

@@ -23,7 +23,7 @@
 using namespace mbed_cellular_util;
 using namespace mbed;
 
-AT_CellularStack::AT_CellularStack(ATHandler &at, int cid, nsapi_ip_stack_t stack_type) : AT_CellularBase(at), _socket(NULL), _socket_count(0), _cid(cid), _stack_type(stack_type)
+AT_CellularStack::AT_CellularStack(ATHandler &at, int cid, nsapi_ip_stack_t stack_type) : AT_CellularBase(at), _socket(NULL), _socket_count(0), _cid(cid), _stack_type(stack_type), _ip_ver_sendto(NSAPI_UNSPEC)
 {
     memset(_ip, 0, PDP_IPV6_SIZE);
 }
@@ -59,27 +59,43 @@ const char *AT_CellularStack::get_ip_address()
 {
     _at.lock();
 
+    bool ipv4 = false, ipv6 = false;
+
     _at.cmd_start_stop("+CGPADDR", "=", "%d", _cid);
     _at.resp_start("+CGPADDR:");
 
-    int len = -1;
     if (_at.info_resp()) {
         _at.skip_param();
 
-        len = _at.read_string(_ip, PDP_IPV6_SIZE);
-
-        if (len != -1 && _stack_type != IPV4_STACK) {
-            // in case stack type is not IPV4 only, try to look also for IPV6 address
-            (void)_at.read_string(_ip, PDP_IPV6_SIZE);
+        if (_at.read_string(_ip, PDP_IPV6_SIZE) != -1) {
+            convert_ipv6(_ip);
+            SocketAddress address;
+            address.set_ip_address(_ip);
+
+            ipv4 = (address.get_ip_version() == NSAPI_IPv4);
+            ipv6 = (address.get_ip_version() == NSAPI_IPv6);
+
+            // Try to look for second address ONLY if modem has support for dual stack(can handle both IPv4 and IPv6 simultaneously).
+            // Otherwise assumption is that second address is not reliable, even if network provides one.
+            if ((get_property(PROPERTY_IPV4V6_PDP_TYPE) && (_at.read_string(_ip, PDP_IPV6_SIZE) != -1))) {
+                convert_ipv6(_ip);
+                address.set_ip_address(_ip);
+                ipv6 = (address.get_ip_version() == NSAPI_IPv6);
+            }
         }
     }
     _at.resp_stop();
     _at.unlock();
 
-    // we have at least IPV4 address
-    convert_ipv6(_ip);
+    if (ipv4 && ipv6) {
+        _stack_type = IPV4V6_STACK;
+    } else if (ipv4) {
+        _stack_type = IPV4_STACK;
+    } else if (ipv6) {
+        _stack_type = IPV6_STACK;
+    }
 
-    return len != -1 ? _ip : NULL;
+    return (ipv4 || ipv6) ? _ip : NULL;
 }
 
 nsapi_error_t AT_CellularStack::socket_stack_init()
@@ -256,6 +272,13 @@ nsapi_size_or_error_t AT_CellularStack::socket_sendto(nsapi_socket_t handle, con
     nsapi_size_or_error_t ret_val = NSAPI_ERROR_OK;
 
     if (socket->id == -1) {
+
+        /* Check that stack type supports sendto address type*/
+        if (!is_addr_stack_compatible(addr)) {
+            return NSAPI_ERROR_PARAMETER;
+        }
+
+        _ip_ver_sendto = addr.get_ip_version();
         _at.lock();
 
         ret_val = create_socket_impl(socket);
@@ -267,9 +290,9 @@ nsapi_size_or_error_t AT_CellularStack::socket_sendto(nsapi_socket_t handle, con
         }
     }
 
-    /* Check parameters */
-    if (addr.get_ip_version() == NSAPI_UNSPEC) {
-        return NSAPI_ERROR_DEVICE_ERROR;
+    /* Check parameters - sendto address is valid and stack type supports sending to that address type*/
+    if (!is_addr_stack_compatible(addr)) {
+        return NSAPI_ERROR_PARAMETER;
     }
 
     _at.lock();
@@ -377,3 +400,14 @@ AT_CellularStack::CellularSocket *AT_CellularStack::find_socket(int sock_id)
     }
     return sock;
 }
+
+bool AT_CellularStack::is_addr_stack_compatible(const SocketAddress &addr)
+{
+    if ((addr.get_ip_version() == NSAPI_UNSPEC) ||
+            (addr.get_ip_version() == NSAPI_IPv4 && _stack_type == IPV6_STACK) ||
+            (addr.get_ip_version() == NSAPI_IPv6 && _stack_type == IPV4_STACK)) {
+        return false;
+    }
+    return true;
+}
+

features/cellular/framework/AT/AT_CellularStack.h

@@ -192,6 +192,11 @@ class AT_CellularStack : public NetworkStack, public AT_CellularBase {
      */
     int find_socket_index(nsapi_socket_t handle);
 
+    /**
+     *  Checks if send to address is valid and if current stack type supports sending to that address type
+     */
+    bool is_addr_stack_compatible(const SocketAddress &addr);
+
     // socket container
     CellularSocket **_socket;
 
@@ -204,9 +209,12 @@ class AT_CellularStack : public NetworkStack, public AT_CellularBase {
     // PDP context id
     int _cid;
 
-    // stack type from PDP context
+    // stack type - initialised as PDP type and set accordingly after CGPADDR checked
     nsapi_ip_stack_t _stack_type;
 
+    // IP version of send to address
+    nsapi_version_t _ip_ver_sendto;
+
 private:
 
     int get_socket_index_by_port(uint16_t port);

features/cellular/framework/common/CellularUtil.cpp

@@ -28,10 +28,10 @@
 using namespace mbed;
 namespace mbed_cellular_util {
 
-void convert_ipv6(char *ip)
+nsapi_version_t convert_ipv6(char *ip)
 {
     if (!ip) {
-        return;
+        return NSAPI_UNSPEC;
     }
 
     int len = strlen(ip);
@@ -49,7 +49,11 @@ void convert_ipv6(char *ip)
 
     // more that 3 periods mean that it was ipv6 but in format of a1.a2.a3.a4.a5.a6.a7.a8.a9.a10.a11.a12.a13.a14.a15.a16
     // we need to convert it to hexadecimal format separated with colons
-    if (pos > 3) {
+    if (pos == 3) {
+
+        return NSAPI_IPv4;
+
+    } else if (pos > 3) {
         pos = 0;
         int ip_pos = 0;
         char b;
@@ -74,7 +78,11 @@ void convert_ipv6(char *ip)
                 ip[pos] = '\0';
             }
         }
+
+        return NSAPI_IPv6;
     }
+
+    return NSAPI_UNSPEC;
 }
 
 // For example "32.1.13.184.0.0.205.48.0.0.0.0.0.0.0.0"

features/cellular/framework/common/CellularUtil.h

@@ -48,8 +48,9 @@ static const char hex_values[] = "0123456789ABCDEF";
  *  where ax are in decimal format. In this case, function converts decimals to hex with separated with colons.
  *
  *  @param ip       IP address that can be IPv4 or IPv6 in different formats from AT command +CGPADDR. Converted result uses same buffer.
+ *  @return         IP version of the address or NSAPI_UNSPEC if param ip empty or if IPv4 or IPv6 version could not be concluded.
  */
-void convert_ipv6(char *ip);
+nsapi_version_t convert_ipv6(char *ip);
 
 /** Separates IP addresses from the given 'orig' string. 'orig' may contain zero, one or two IP addresses in various formats.
  *  See AT command +CGPIAF from 3GPP TS 27.007 for details. Does also needed conversions for IPv6 addresses.

features/cellular/framework/targets/QUECTEL/BG96/QUECTEL_BG96.cpp

@@ -57,7 +57,7 @@ static const intptr_t cellular_properties[AT_CellularBase::PROPERTY_MAX] = {
     1,  // AT_CMGF
     1,  // AT_CSDH
     1,  // PROPERTY_IPV4_STACK
-    0,  // PROPERTY_IPV6_STACK
+    1,  // PROPERTY_IPV6_STACK
     0,  // PROPERTY_IPV4V6_STACK
     1,  // PROPERTY_NON_IP_PDP_TYPE
     1,  // PROPERTY_AT_CGEREP

features/cellular/framework/targets/QUECTEL/BG96/QUECTEL_BG96_CellularStack.cpp

@@ -212,7 +212,7 @@ nsapi_error_t QUECTEL_BG96_CellularStack::create_socket_impl(CellularSocket *soc
 
     if (socket->proto == NSAPI_UDP && !socket->connected) {
         _at.at_cmd_discard("+QIOPEN", "=", "%d%d%s%s%d%d%d", _cid, request_connect_id, "UDP SERVICE",
-                           (_stack_type == IPV4_STACK) ? "127.0.0.1" : "0:0:0:0:0:0:0:1",
+                           (_ip_ver_sendto == NSAPI_IPv4) ? "127.0.0.1" : "0:0:0:0:0:0:0:1",
                            remote_port, socket->localAddress.get_port(), 0);
 
         handle_open_socket_response(modem_connect_id, err);
@@ -225,7 +225,7 @@ nsapi_error_t QUECTEL_BG96_CellularStack::create_socket_impl(CellularSocket *soc
             socket_close_impl(modem_connect_id);
 
             _at.at_cmd_discard("+QIOPEN", "=", "%d%d%s%s%d%d%d", _cid, request_connect_id, "UDP SERVICE",
-                               (_stack_type == IPV4_STACK) ? "127.0.0.1" : "0:0:0:0:0:0:0:1",
+                               (_ip_ver_sendto == NSAPI_IPv4) ? "127.0.0.1" : "0:0:0:0:0:0:0:1",
                                remote_port, socket->localAddress.get_port(), 0);
 
             handle_open_socket_response(modem_connect_id, err);
@@ -273,6 +273,12 @@ nsapi_size_or_error_t QUECTEL_BG96_CellularStack::socket_sendto_impl(CellularSoc
         return NSAPI_ERROR_PARAMETER;
     }
 
+    if (_ip_ver_sendto != address.get_ip_version()) {
+        _ip_ver_sendto =  address.get_ip_version();
+        socket_close_impl(socket->id);
+        create_socket_impl(socket);
+    }
+
     int sent_len = 0;
     int sent_len_before = 0;
     int sent_len_after = 0;