s3:smb2_server: announce LargeMTU for SMB2.1

Signed-off-by: Jeremy Allison <jra@samba.org>

diff --git a/source3/smbd/smb2_negprot.c b/source3/smbd/smb2_negprot.c
index dd27700c7b52a408b091e94f9610ffd9acccb08f..cb8e98354a93ad226da8d217a031e905f7fa1b78 100644 (file)
--- a/source3/smbd/smb2_negprot.c
+++ b/source3/smbd/smb2_negprot.c
@@ -22,6 +22,7 @@
 #include "smbd/smbd.h"
 #include "smbd/globals.h"
 #include "../libcli/smb/smb_common.h"
+#include "tsocket.h"
 
 /*
  * this is the entry point if SMB2 is selected via
@@ -226,14 +227,36 @@ NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
        }
 
        /*
-        * Unless we implement SMB2_CAP_LARGE_MTU,
         * 0x10000 (65536) is the maximum allowed message size
+        * for SMB 2.0
         */
        max_limit = 0x10000;
 
-       max_trans = MIN(max_limit, max_trans);
-       max_read  = MIN(max_limit, max_read);
-       max_write = MIN(max_limit, max_write);
+       if (protocol >= PROTOCOL_SMB2_10) {
+               /* largeMTU is only available on port 445 */
+               if (TCP_SMB_PORT ==
+                   tsocket_address_inet_port(req->sconn->local_address))
+               {
+
+                       capabilities |= SMB2_CAP_LARGE_MTU;
+                       req->sconn->smb2.supports_multicredit = true;
+
+                       /* SMB2.1 has 1 MB of allowed size */
+                       max_limit = 0x100000; /* 1MB */
+               }
+       }
+
+       /*
+        * the defaults are 1MB, but we'll limit this to max_limit based on
+        * the dialect (64kb for SMB2.0, 1MB for SMB2.1 with LargeMTU)
+        *
+        * user configured values exceeding the limits will be overwritten,
+        * only smaller values will be accepted
+        */
+
+       max_trans = MIN(max_limit, lp_smb2_max_trans());
+       max_read = MIN(max_limit, lp_smb2_max_read());
+       max_write = MIN(max_limit, lp_smb2_max_write());
 
        security_offset = SMB2_HDR_BODY + 0x40;