only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/link/src/Plugin/migrate/field/LinkField.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace Drupal\link\Plugin\migrate\field;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate_drupal\Plugin\migrate\field\FieldPluginBase;
+
+/**
+ * @MigrateField(
+ *   id = "link",
+ *   core = {6},
+ *   type_map = {
+ *     "link_field" = "link"
+ *   }
+ * )
+ */
+class LinkField extends FieldPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFieldFormatterMap() {
+    // See d6_field_formatter_settings.yml and FieldPluginBase
+    // processFieldFormatter().
+    return [
+      'default' => 'link',
+      'plain' => 'link',
+      'absolute' => 'link',
+      'title_plain' => 'link',
+      'url' => 'link',
+      'short' => 'link',
+      'label' => 'link',
+      'separate' => 'link_separate',
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+    $process = [
+      'plugin' => 'd6_field_link',
+      'source' => $field_name,
+    ];
+    $migration->mergeProcessOfProperty($field_name, $process);
+  }
+
+}
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/link/src/Plugin/migrate/field/d7/LinkField.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace Drupal\link\Plugin\migrate\field\d7;
+
+use Drupal\link\Plugin\migrate\field\LinkField as D6LinkField;
+use Drupal\migrate\Plugin\MigrationInterface;
+
+/**
+ * @MigrateField(
+ *   id = "link_field",
+ *   core = {7},
+ *   type_map = {
+ *     "link_field" = "link"
+ *   }
+ * )
+ *
+ * This plugin provides the exact same functionality as the Drupal 6 "link"
+ * plugin with the exception that the plugin ID "link_field" is used in the
+ * field type map.
+ */
+class LinkField extends D6LinkField {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFieldWidgetMap() {
+    // By default, use the plugin ID for the widget types.
+    return ['link_field' => 'link_default'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function processFieldInstance(MigrationInterface $migration) {
+    $process = [
+      'plugin' => 'static_map',
+      'source' => 'instance_settings/title',
+      'bypass' => TRUE,
+      'map' => [
+        'disabled' => DRUPAL_DISABLED,
+        'optional' => DRUPAL_OPTIONAL,
+        'required' => DRUPAL_REQUIRED,
+      ],
+    ];
+    $migration->mergeProcessOfProperty('settings/title', $process);
+  }
+
+}
only in patch2:
unchanged:
--- a/core/modules/link/src/Plugin/migrate/process/d6/CckLink.php
+++ b/core/modules/link/src/Plugin/migrate/process/d6/CckLink.php
@@ -2,85 +2,12 @@
 
 namespace Drupal\link\Plugin\migrate\process\d6;
 
-use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
-use Drupal\migrate\Plugin\MigrationInterface;
-use Drupal\migrate\MigrateExecutableInterface;
-use Drupal\migrate\ProcessPluginBase;
-use Drupal\migrate\Row;
-use Symfony\Component\DependencyInjection\ContainerInterface;
-
 /**
+ * @deprecated in Drupal 8.2.x and will be removed before Drupal 9.0.x. Use the
+ *   d6_field_link plugin instead.
+ *
  * @MigrateProcessPlugin(
  *   id = "d6_cck_link"
  * )
  */
-class CckLink extends ProcessPluginBase implements ContainerFactoryPluginInterface {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration) {
-    parent::__construct($configuration, $plugin_id, $plugin_definition);
-    $this->migration = $migration;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
-    return new static(
-      $configuration,
-      $plugin_id,
-      $plugin_definition,
-      $migration
-    );
-  }
-
-  /**
-   * Turn a Drupal 6 URI into a Drupal 8-compatible format.
-   *
-   * @param string $uri
-   *   The 'url' value from Drupal 6.
-   *
-   * @return string
-   *   The Drupal 8-compatible URI.
-   *
-   * @see \Drupal\link\Plugin\Field\FieldWidget\LinkWidget::getUserEnteredStringAsUri()
-   */
-  protected function canonicalizeUri($uri) {
-    // If we already have a scheme, we're fine.
-    if (empty($uri) || !is_null(parse_url($uri, PHP_URL_SCHEME))) {
-      return $uri;
-    }
-
-    // Remove the <front> component of the URL.
-    if (strpos($uri, '<front>') === 0) {
-      $uri = substr($uri, strlen('<front>'));
-    }
-
-    // Add the internal: scheme and ensure a leading slash.
-    return 'internal:/' . ltrim($uri, '/');
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
-    $attributes = unserialize($value['attributes']);
-    // Drupal 6 link attributes might be double serialized.
-    if (!is_array($attributes)) {
-      $attributes = unserialize($attributes);
-    }
-
-    if (!$attributes) {
-      $attributes = [];
-    }
-
-    // Massage the values into the correct form for the link.
-    $route['uri'] = $this->canonicalizeUri($value['url']);
-    $route['options']['attributes'] = $attributes;
-    $route['title'] = $value['title'];
-    return $route;
-  }
-
-}
+class CckLink extends FieldLink { }
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/link/src/Plugin/migrate/process/d6/FieldLink.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace Drupal\link\Plugin\migrate\process\d6;
+
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * @MigrateProcessPlugin(
+ *   id = "d6_field_link"
+ * )
+ */
+class FieldLink extends ProcessPluginBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->migration = $migration;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $migration
+    );
+  }
+
+  /**
+   * Turn a Drupal 6 URI into a Drupal 8-compatible format.
+   *
+   * @param string $uri
+   *   The 'url' value from Drupal 6.
+   *
+   * @return string
+   *   The Drupal 8-compatible URI.
+   *
+   * @see \Drupal\link\Plugin\Field\FieldWidget\LinkWidget::getUserEnteredStringAsUri()
+   */
+  protected function canonicalizeUri($uri) {
+    // If we already have a scheme, we're fine.
+    if (empty($uri) || !is_null(parse_url($uri, PHP_URL_SCHEME))) {
+      return $uri;
+    }
+
+    // Remove the <front> component of the URL.
+    if (strpos($uri, '<front>') === 0) {
+      $uri = substr($uri, strlen('<front>'));
+    }
+
+    // Add the internal: scheme and ensure a leading slash.
+    return 'internal:/' . ltrim($uri, '/');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    $attributes = unserialize($value['attributes']);
+    // Drupal 6 link attributes might be double serialized.
+    if (!is_array($attributes)) {
+      $attributes = unserialize($attributes);
+    }
+
+    if (!$attributes) {
+      $attributes = [];
+    }
+
+    // Massage the values into the correct form for the link.
+    $route['uri'] = $this->canonicalizeUri($value['url']);
+    $route['options']['attributes'] = $attributes;
+    $route['title'] = $value['title'];
+    return $route;
+  }
+
+}