Patch for the webform module to integrate wtih the core ban module to block the IP address of a submission.

webform-ip-ban-integration.patch

diff --git a/src/WebformSubmissionListBuilder.php b/src/WebformSubmissionListBuilder.php
index b684647ec..48cc91c43 100644
--- a/src/WebformSubmissionListBuilder.php
+++ b/src/WebformSubmissionListBuilder.php
@@ -1114,6 +1114,19 @@ class WebformSubmissionListBuilder extends EntityListBuilder {
           'url' => $this->requestHandler->getUrl($entity, $this->sourceEntity, 'webform_submission.log'),
         ];
       }
+
+      if ($this->moduleHandler()->moduleExists('ban') && $this->currentUser->hasPermission('ban IP addresses')) {
+        /** @var \Drupal\ban\BanIpManager */
+        $ban_ip_manager = \Drupal::service('ban.ip_manager');
+        if (!$ban_ip_manager->isBanned($entity->getRemoteAddr())) {
+          $operations['block'] = [
+            'title' => $this->t('Block IP Address'),
+            'weight' => 100,
+            'url' => Url::fromRoute('ban.admin_page', ['default_ip' => $entity->getRemoteAddr()]),
+            'attributes' => WebformDialogHelper::getModalDialogAttributes(WebformDialogHelper::DIALOG_NARROW),
+          ];
+        }
+      }
     }
 
     // Add destination to all operation links.