detect: file_data keyword works on nfs protocol

Ticket: #4839

src/detect-file-data.c

@@ -111,6 +111,10 @@ void DetectFiledataRegister(void)
     DetectAppLayerMpmRegister2("file_data", SIG_FLAG_TOCLIENT, 2,
             PrefilterMpmFiledataRegister, NULL,
             ALPROTO_HTTP2, HTTP2StateDataServer);
+    DetectAppLayerMpmRegister2(
+            "file_data", SIG_FLAG_TOSERVER, 2, PrefilterMpmFiledataRegister, NULL, ALPROTO_NFS, 0);
+    DetectAppLayerMpmRegister2(
+            "file_data", SIG_FLAG_TOCLIENT, 2, PrefilterMpmFiledataRegister, NULL, ALPROTO_NFS, 0);
     DetectAppLayerMpmRegister2("file_data", SIG_FLAG_TOSERVER, 2, PrefilterMpmFiledataRegister,
             NULL, ALPROTO_FTPDATA, 0);
     DetectAppLayerMpmRegister2("file_data", SIG_FLAG_TOCLIENT, 2, PrefilterMpmFiledataRegister,
@@ -139,6 +143,10 @@ void DetectFiledataRegister(void)
     DetectAppLayerInspectEngineRegister2("file_data",
             ALPROTO_HTTP2, SIG_FLAG_TOCLIENT, HTTP2StateDataServer,
             DetectEngineInspectFiledata, NULL);
+    DetectAppLayerInspectEngineRegister2(
+            "file_data", ALPROTO_NFS, SIG_FLAG_TOSERVER, 0, DetectEngineInspectFiledata, NULL);
+    DetectAppLayerInspectEngineRegister2(
+            "file_data", ALPROTO_NFS, SIG_FLAG_TOCLIENT, 0, DetectEngineInspectFiledata, NULL);
     DetectAppLayerInspectEngineRegister2(
             "file_data", ALPROTO_FTPDATA, SIG_FLAG_TOSERVER, 0, DetectEngineInspectFiledata, NULL);
     DetectAppLayerInspectEngineRegister2(
@@ -198,7 +206,8 @@ static int DetectFiledataSetup (DetectEngineCtx *de_ctx, Signature *s, const cha
             (s->alproto != ALPROTO_UNKNOWN && s->alproto != ALPROTO_HTTP1 &&
                     s->alproto != ALPROTO_SMTP && s->alproto != ALPROTO_SMB &&
                     s->alproto != ALPROTO_HTTP2 && s->alproto != ALPROTO_FTP &&
-                    s->alproto != ALPROTO_FTPDATA && s->alproto != ALPROTO_HTTP)) {
+                    s->alproto != ALPROTO_FTPDATA && s->alproto != ALPROTO_HTTP &&
+                    s->alproto != ALPROTO_NFS)) {
         SCLogError(SC_ERR_CONFLICTING_RULE_KEYWORDS, "rule contains conflicting keywords.");
         return -1;
     }