make listening socket creation optional for userspace path manager plugins

include/mptcpd/path_manager.h

@@ -118,13 +118,15 @@ MPTCPD_API bool mptcpd_pm_ready(struct mptcpd_pm const *pm);
  *                      byte order.
  * @param[in]     id    MPTCP local address ID.
  * @param[in]     token MPTCP connection token.
+ * @param[in]     nolst Don't create listener.
  *
  * @return @c 0 if operation was successful. -1 or @c errno otherwise.
  */
 MPTCPD_API int mptcpd_pm_add_addr(struct mptcpd_pm *pm,
                                   struct sockaddr *addr,
                                   mptcpd_aid_t id,
-                                  mptcpd_token_t token);
+                                  mptcpd_token_t token,
+                                  bool nolst);
 
 /**
  * @brief Stop advertising network address to peers.

include/mptcpd/private/path_manager.h

@@ -150,14 +150,16 @@ struct mptcpd_pm_cmd_ops
          *                      network byte order.
          * @param[in]     id    MPTCP local address ID.
          * @param[in]     token MPTCP connection token.
+         * @param[in]     nolst Don't create listener.
          *
          * @return @c 0 if operation was successful. -1 or @c errno
          *         otherwise.
          */
         int (*add_addr)(struct mptcpd_pm *pm,
                         struct sockaddr *addr,
                         mptcpd_aid_t id,
-                        mptcpd_token_t token);
+                        mptcpd_token_t token,
+                        bool nolst);
 
         /**
          * @brief Stop advertising network address to peers.

lib/path_manager.c

@@ -241,7 +241,8 @@ int mptcpd_kpm_set_flags(struct mptcpd_pm *pm,
 int mptcpd_pm_add_addr(struct mptcpd_pm *pm,
                        struct sockaddr *addr,
                        mptcpd_aid_t address_id,
-                       mptcpd_token_t token)
+                       mptcpd_token_t token,
+                       bool nolst)
 {
         if (pm == NULL || addr == NULL || address_id == 0)
                 return EINVAL;
@@ -258,7 +259,8 @@ int mptcpd_pm_add_addr(struct mptcpd_pm *pm,
         return ops->add_addr(pm,
                              addr,
                              address_id,
-                             token);
+                             token,
+                             nolst);
 }
 
 int mptcpd_pm_remove_addr(struct mptcpd_pm *pm,

plugins/path_managers/sspi.c

@@ -487,7 +487,8 @@ static void sspi_send_addr(void *data, void *user_data)
         mptcpd_pm_add_addr(info->pm,
                            sa,
                            address_id,
-                           info->token);
+                           info->token,
+                           false);
 
         /**
          * @todo The sspi plugin currently doesn't stop advertising IP

src/netlink_pm_upstream.c

@@ -219,20 +219,21 @@ static int send_add_addr(struct mptcpd_pm *pm,
 static int upstream_announce(struct mptcpd_pm *pm,
                              struct sockaddr *addr,
                              mptcpd_aid_t id,
-                             mptcpd_token_t token)
+                             mptcpd_token_t token,
+                             bool nolst)
 {
-        /**
-         * Set up MPTCP listening socket.
-         *
-         * @note An ephemeral port will be assigned to the port in
-         *       @a addr if it is zero.
-         *
-         * @todo This should be optional.
-         */
-        int const r = mptcpd_lm_listen(pm->lm, addr);
+        if (!nolst) {
+                /**
+                 * Set up MPTCP listening socket.
+                 *
+                 * @note An ephemeral port will be assigned to the port in
+                 *       @a addr if it is zero.
+                 */
+                int const r = mptcpd_lm_listen(pm->lm, addr);
 
-        if (r != 0)
-                return r;
+                if (r != 0)
+                        return r;
+        }
 
         /**
          * @todo Add support for the optional network interface index

tests/test-commands.c

@@ -473,7 +473,8 @@ static void test_add_addr_user(void const *test_data)
         int const result = mptcpd_pm_add_addr(pm,
                                               u_addr->addr,
                                               u_addr->id,
-                                              u_addr->token);
+                                              u_addr->token,
+                                              false);
 
         /*
           EADDRNOTAVAIL error will generally occur if the test is run