From: Steve French Date: Fri, 7 May 2021 23:24:11 +0000 (-0500) Subject: smb3: when mounting with multichannel include it in requested capabilities X-Git-Tag: v5.11.20~47 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3dce7356b8932c5fc7cae39ee87179387f1a694b;p=thirdparty%2Fkernel%2Fstable.git smb3: when mounting with multichannel include it in requested capabilities commit 679971e7213174efb56abc8fab1299d0a88db0e8 upstream. In the SMB3/SMB3.1.1 negotiate protocol request, we are supposed to advertise CAP_MULTICHANNEL capability when establishing multiple channels has been requested by the user doing the mount. See MS-SMB2 sections 2.2.3 and 3.2.5.2 Without setting it there is some risk that multichannel could fail if the server interpreted the field strictly. Reviewed-By: Tom Talpey Reviewed-by: Shyam Prasad N Cc: # v5.8+ Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 6a1af5545f674..ca62b858c71f2 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -840,6 +840,8 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses) req->SecurityMode = 0; req->Capabilities = cpu_to_le32(server->vals->req_capabilities); + if (ses->chan_max > 1) + req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL); /* ClientGUID must be zero for SMB2.02 dialect */ if (server->vals->protocol_id == SMB20_PROT_ID) @@ -1025,6 +1027,9 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) pneg_inbuf->Capabilities = cpu_to_le32(server->vals->req_capabilities); + if (tcon->ses->chan_max > 1) + pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL); + memcpy(pneg_inbuf->Guid, server->client_guid, SMB2_CLIENT_GUID_SIZE);