nginxMainline: enable ktls support

nixos/modules/services/web-servers/nginx/default.nix

@@ -313,9 +313,12 @@ let
           ${optionalString (hasSSL && vhost.sslTrustedCertificate != null) ''
             ssl_trusted_certificate ${vhost.sslTrustedCertificate};
           ''}
-          ${optionalString vhost.rejectSSL ''
+          ${optionalString (hasSSL && vhost.rejectSSL) ''
             ssl_reject_handshake on;
           ''}
+          ${optionalString (hasSSL && vhost.kTLS) ''
+            ssl_conf_command Options KTLS;
+          ''}
 
           ${mkBasicAuth vhostName vhost}
 
@@ -820,6 +823,14 @@ in
         '';
       }
 
+      {
+        assertion = any (host: host.kTLS) (attrValues virtualHosts) -> versionAtLeast cfg.package.version "1.21.4";
+        message = ''
+          services.nginx.virtualHosts.<name>.kTLS requires nginx version
+          1.21.4 or above; see the documentation for services.nginx.package.
+        '';
+      }
+
       {
         assertion = all (host: !(host.enableACME && host.useACMEHost != null)) (attrValues virtualHosts);
         message = ''
@@ -896,7 +907,7 @@ in
         PrivateMounts = true;
         # System Call Filtering
         SystemCallArchitectures = "native";
-        SystemCallFilter = "~@cpu-emulation @debug @keyring @ipc @mount @obsolete @privileged @setuid @mincore";
+        SystemCallFilter = [ "~@cpu-emulation @debug @keyring @mount @obsolete @privileged @setuid @mincore" ] ++ optionals (cfg.package != pkgs.tengine) [ "~@ipc" ];
       };
     };
 

nixos/modules/services/web-servers/nginx/vhost-options.nix

@@ -147,6 +147,17 @@ with lib;
       '';
     };
 
+    kTLS = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to enable kTLS support.
+        Implementing TLS in the kernel (kTLS) improves performance by significantly
+        reducing the need for copying operations between user space and the kernel.
+        Required Nginx version 1.21.4 or later.
+      '';
+    };
+
     sslCertificate = mkOption {
       type = types.path;
       example = "/var/host.cert";

pkgs/development/libraries/openssl/default.nix

@@ -108,6 +108,7 @@ let
       "-DUSE_CRYPTODEV_DIGESTS"
     ] ++ lib.optional enableSSL2 "enable-ssl2"
       ++ lib.optional enableSSL3 "enable-ssl3"
+      ++ lib.optional (versionAtLeast version "3.0.0") "enable-ktls"
       ++ lib.optional (versionAtLeast version "1.1.0" && stdenv.hostPlatform.isAarch64) "no-afalgeng"
       # OpenSSL needs a specific `no-shared` configure flag.
       # See https://wiki.openssl.org/index.php/Compilation_and_Installation#Configure_Options

pkgs/servers/http/nginx/generic.nix

@@ -3,6 +3,7 @@
 , nixosTests
 , substituteAll, gd, geoip, perl
 , withDebug ? false
+, withKTLS ? false
 , withStream ? true
 , withMail ? false
 , withPerl ? true
@@ -80,6 +81,8 @@ stdenv.mkDerivation {
     "--http-scgi-temp-path=/var/cache/nginx/scgi"
   ] ++ optionals withDebug [
     "--with-debug"
+  ] ++ optionals withKTLS [
+    "--with-openssl-opt=enable-ktls"
   ] ++ optionals withStream [
     "--with-stream"
     "--with-stream_realip_module"

pkgs/top-level/all-packages.nix

@@ -21035,6 +21035,7 @@ with pkgs;
 
   nginxMainline = callPackage ../servers/http/nginx/mainline.nix {
     zlib = zlib-ng.override { withZlibCompat = true; };
+    withKTLS = true;
     withPerl = false;
     # We don't use `with` statement here on purpose!
     # See https://github.com/NixOS/nixpkgs/pull/10474#discussion_r42369334