Add option for dual stack IPv4&IPv6 account config

pjsip-apps/src/pjsua/pjsua_app.c

@@ -1713,7 +1713,7 @@ static pj_status_t app_init(void)
 
             app_config_init_video(&acc_cfg);
             acc_cfg.rtp_cfg = app_config.rtp_cfg;
-            acc_cfg.ipv6_media_use = PJSUA_IPV6_ENABLED;
+            // acc_cfg.ipv6_media_use = PJSUA_IPV6_ENABLED;
             pjsua_acc_modify(aid, &acc_cfg);
         }
 
@@ -1778,7 +1778,7 @@ static pj_status_t app_init(void)
 
             app_config_init_video(&acc_cfg);
             acc_cfg.rtp_cfg = app_config.rtp_cfg;
-            acc_cfg.ipv6_media_use = PJSUA_IPV6_ENABLED;
+            // acc_cfg.ipv6_media_use = PJSUA_IPV6_ENABLED;
             pjsua_acc_modify(aid, &acc_cfg);
         }
 
@@ -1846,7 +1846,7 @@ static pj_status_t app_init(void)
 
             app_config_init_video(&acc_cfg);
             acc_cfg.rtp_cfg = app_config.rtp_cfg;
-            acc_cfg.ipv6_media_use = PJSUA_IPV6_ENABLED;
+            // acc_cfg.ipv6_media_use = PJSUA_IPV6_ENABLED;
             pjsua_acc_modify(aid, &acc_cfg);
         }
 

pjsip-apps/src/pjsua/pjsua_app_config.c

@@ -91,7 +91,7 @@ static void usage(void)
     puts  ("");
     puts  ("Transport Options:");
 #if defined(PJ_HAS_IPV6) && PJ_HAS_IPV6
-    puts  ("  --ipv6              Use IPv6 instead for SIP and media.");
+    puts  ("  --ipv6              Create SIP IPv6 transports.");
 #endif
     puts  ("  --set-qos           Enable QoS tagging for SIP and media.");
     puts  ("  --local-port=port   Set TCP/UDP port. This implicitly enables both ");

pjsip-apps/src/swig/symbols.i

@@ -816,7 +816,11 @@ typedef enum pjsua_sip_timer_use
 typedef enum pjsua_ipv6_use
 {
   PJSUA_IPV6_DISABLED,
-  PJSUA_IPV6_ENABLED
+  PJSUA_IPV6_ENABLED = 1,
+  PJSUA_IPV6_ENABLED_NO_PREFERENCE = 1,
+  PJSUA_IPV6_ENABLED_PREFER_IPV4,
+  PJSUA_IPV6_ENABLED_PREFER_IPV6,
+  PJSUA_IPV6_ENABLED_USE_IPV6_ONLY
 } pjsua_ipv6_use;
 
 typedef enum pjsua_nat64_opt

pjsip/include/pjsip/sip_resolve.h

@@ -171,6 +171,25 @@ PJ_BEGIN_DECL
  *  - RFC 3263: Locating SIP Servers
  */
 
+/** Address records. */
+typedef struct pjsip_server_address_record
+{
+    /** Preferable transport to be used to contact this address. */
+    pjsip_transport_type_e  type;
+
+    /** Server priority (the lower the higher the priority). */
+    unsigned                priority;
+
+    /** Server weight (the higher the more load it can handle). */
+    unsigned                weight;
+
+    /** The server's address. */
+    pj_sockaddr             addr;
+
+    /** Address length. */
+    int                     addr_len;
+} pjsip_server_address_record;
+
 /**
  * The server addresses returned by the resolver.
  */
@@ -180,24 +199,7 @@ typedef struct pjsip_server_addresses
     unsigned    count;
 
     /** Address records. */
-    struct
-    {
-        /** Preferable transport to be used to contact this address. */
-        pjsip_transport_type_e  type;
-
-        /** Server priority (the lower the higher the priority). */
-        unsigned                priority;
-
-        /** Server weight (the higher the more load it can handle). */
-        unsigned                weight;
-
-        /** The server's address. */
-        pj_sockaddr             addr;
-
-        /** Address length. */
-        int                     addr_len;
-
-    } entry[PJSIP_MAX_RESOLVED_ADDRESSES];
+    pjsip_server_address_record entry[PJSIP_MAX_RESOLVED_ADDRESSES];
 
 } pjsip_server_addresses;
 

pjsip/include/pjsip/sip_transport.h

@@ -203,8 +203,36 @@ typedef enum pjsip_tpselector_type
     /** Use the specific listener to send request. */
     PJSIP_TPSELECTOR_LISTENER,
 
+    /** Use the IP version criteria to send request. */
+    PJSIP_TPSELECTOR_IP_VER,
+
 } pjsip_tpselector_type;
 
+/**
+ * This enumerator describes the IP version criteria for pjsip_tpselector.
+ */
+typedef enum pjsip_tpselector_ip_ver
+{
+    /** IPv4 only. */
+    PJSIP_TPSELECTOR_USE_IPV4_ONLY,
+
+    /**
+     * No preference. IP version used will depend on the order of addresses
+     * returned by pjsip_resolver.
+     */
+    PJSIP_TPSELECTOR_NO_PREFERENCE,
+
+    /** IPv4 is preferred. */
+    PJSIP_TPSELECTOR_PREFER_IPV4,
+
+    /** IPv6 is preferred. */
+    PJSIP_TPSELECTOR_PREFER_IPV6,
+
+    /** IPv6 only. */
+    PJSIP_TPSELECTOR_USE_IPV6_ONLY
+
+} pjsip_tpselector_ip_ver;
+
 
 /**
  * This structure describes the transport/listener preference to be used
@@ -240,11 +268,15 @@ typedef struct pjsip_tpselector
      */
     pj_bool_t disable_connection_reuse;
 
-    /** Union representing the transport/listener criteria to be used. */
+    /**
+     * Union representing the transport/listener/IP version criteria
+     * to be used.
+     */
     union {
-        pjsip_transport *transport;
-        pjsip_tpfactory *listener;
-        void            *ptr;
+        pjsip_transport         *transport;
+        pjsip_tpfactory         *listener;
+        pjsip_tpselector_ip_ver  ip_ver;
+        void                    *ptr;
     } u;
 
 } pjsip_tpselector;

pjsip/include/pjsua-lib/pjsua.h

@@ -3677,6 +3677,8 @@ typedef struct pjsua_turn_config
 
 /**
  * Specify how IPv6 transport should be used in account config.
+ * IP version preference only applies for outgoing direction, for incoming
+ * direction, we will check the corresponding message/offer and match it.
  */
 typedef enum pjsua_ipv6_use
 {
@@ -3688,7 +3690,23 @@ typedef enum pjsua_ipv6_use
     /**
      * IPv6 is enabled.
      */
-    PJSUA_IPV6_ENABLED
+    PJSUA_IPV6_ENABLED = 1,
+    PJSUA_IPV6_ENABLED_NO_PREFERENCE = 1,
+
+    /**
+     * IPv6 is enabled, but IPv4 is preferable.
+     */
+    PJSUA_IPV6_ENABLED_PREFER_IPV4,
+
+    /**
+     * IPv6 is enabled and preferable.
+     */
+    PJSUA_IPV6_ENABLED_PREFER_IPV6,
+
+    /**
+     * Only IPv6 is enabled, IPv4 will not be used.
+     */
+    PJSUA_IPV6_ENABLED_USE_IPV6_ONLY
 
 } pjsua_ipv6_use;
 
@@ -4177,8 +4195,21 @@ typedef struct pjsua_acc_config
      */
     pjsua_nat64_opt             nat64_opt;
 
+    /**
+     * Specify whether IPv6 should be used for SIP signalling.
+     *
+     * Default: PJSUA_IPV6_ENABLED_NO_PREFERENCE
+     * (IP version used will be based on the address resolution
+     * returned by OS/resolver)
+     */
+    pjsua_ipv6_use              ipv6_sip_use;
+
     /**
      * Specify whether IPv6 should be used on media.
+     *
+     * Default: PJSUA_IPV6_ENABLED_PREFER_IPV4
+     * (Dual stack media, capable to use IPv4/IPv6.
+     * Outgoing offer will prefer to use IPv4)
      */
     pjsua_ipv6_use              ipv6_media_use;
 

pjsip/include/pjsua2/account.hpp

@@ -277,6 +277,15 @@ struct AccountSipConfig : public PersistentObject
      */
     TransportId         transportId;
 
+    /**
+     * Specify whether IPv6 should be used for SIP signalling.
+     *
+     * Default: PJSUA_IPV6_ENABLED_NO_PREFERENCE
+     * (IP version used will be based on the address resolution
+     * returned by OS/resolver)
+     */
+    pjsua_ipv6_use      ipv6Use;
+
 public:
     /**
      * Read this object from a container node.
@@ -1033,7 +1042,11 @@ struct AccountMediaConfig : public PersistentObject
     SrtpOpt             srtpOpt;
 
     /**
-     * Specify whether IPv6 should be used on media. Default is not used.
+     * Specify whether IPv6 should be used on media.
+     *
+     * Default: PJSUA_IPV6_ENABLED_PREFER_IPV4
+     * (Dual stack media, capable to use IPv4/IPv6.
+     * Outgoing offer will prefer to use IPv4)
      */
     pjsua_ipv6_use      ipv6Use;
 
@@ -1082,7 +1095,7 @@ struct AccountMediaConfig : public PersistentObject
       streamKaEnabled(false),
       srtpUse(PJSUA_DEFAULT_USE_SRTP),
       srtpSecureSignaling(PJSUA_DEFAULT_SRTP_SECURE_SIGNALING),
-      ipv6Use(PJSUA_IPV6_DISABLED),
+      ipv6Use(PJSUA_IPV6_ENABLED_PREFER_IPV4),
       rtcpMuxEnabled(false),
       rtcpXrEnabled(PJMEDIA_STREAM_ENABLE_XR),
       useLoopMedTp(false),

pjsip/src/pjsip/sip_transport.c

@@ -2331,6 +2331,15 @@ PJ_DEF(pj_status_t) pjsip_tpmgr_acquire_transport2(pjsip_tpmgr *mgr,
                 TRACE_((THIS_FILE, "Listener type in tpsel not matched"));
                 return PJSIP_ETPNOTSUITABLE;
             }
+        } else if (sel && sel->type == PJSIP_TPSELECTOR_IP_VER) {
+            if ((sel->u.ip_ver == PJSIP_TPSELECTOR_USE_IPV4_ONLY &&
+                 pjsip_transport_type_get_af(type) != pj_AF_INET()) ||
+                (sel->u.ip_ver == PJSIP_TPSELECTOR_USE_IPV6_ONLY &&
+                 pjsip_transport_type_get_af(type) != pj_AF_INET6()))
+            {
+                TRACE_((THIS_FILE, "Address type in tpsel not matched"));
+                return PJSIP_ETPNOTSUITABLE;
+            }
         }
 
         if (!sel || sel->disable_connection_reuse == PJ_FALSE) {

pjsip/src/pjsip/sip_util.c

@@ -24,6 +24,7 @@
 #include <pjsip/sip_transaction.h>
 #include <pjsip/sip_module.h>
 #include <pjsip/sip_errno.h>
+#include <pj/array.h>
 #include <pj/log.h>
 #include <pj/string.h>
 #include <pj/guid.h>
@@ -33,7 +34,7 @@
 #include <pj/assert.h>
 #include <pj/errno.h>
 
-#define THIS_FILE    "endpoint"
+#define THIS_FILE    "sip_util.c"
 
 static const char *event_str[] = 
 {
@@ -1306,6 +1307,29 @@ static void stateless_send_transport_cb( void *token,
 
 }
 
+/* Resort addresses based on preferred address family.
+ * Note that the order of addresses within the same address family will
+ * be preserved.
+ */
+static void resort_address(pjsip_server_addresses *addr, int af)
+{
+    unsigned i = 0, j = 0;
+
+    while (j < addr->count) {
+        if (addr->entry[j].addr.addr.sa_family == af) {
+            if (i != j) {
+                pjsip_server_address_record temp;
+
+                pj_memcpy(&temp, &addr->entry[j], sizeof(temp));
+                pj_array_insert(addr->entry, sizeof(addr->entry[0]),
+                                j, i, &temp);
+            }
+            i++;
+        }
+        j++;
+    }
+}
+
 /* Resolver callback for sending stateless request. */
 static void 
 stateless_send_resolver_callback( pj_status_t status,
@@ -1382,6 +1406,17 @@ stateless_send_resolver_callback( pj_status_t status,
         }
     }
 
+    if (tdata->tp_sel.type == PJSIP_TPSELECTOR_IP_VER) {
+        PJ_LOG(5, (THIS_FILE, "Resorting target addresses based on "
+                   "%s preference",
+                   tdata->tp_sel.u.ip_ver == PJSIP_TPSELECTOR_PREFER_IPV4?
+                   "IPv4": "IPv6"));
+        if (tdata->tp_sel.u.ip_ver == PJSIP_TPSELECTOR_PREFER_IPV4)
+            resort_address(&tdata->dest_info.addr, pj_AF_INET());
+        else if (tdata->tp_sel.u.ip_ver == PJSIP_TPSELECTOR_PREFER_IPV6)
+            resort_address(&tdata->dest_info.addr, pj_AF_INET6());
+    }
+
     /* Process the addresses. */
     stateless_send_transport_cb( stateless_data, tdata, -PJ_EPENDING);
 }