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781802aa5a
Function ip_rfc1001_connect() which establish NetBIOS session for SMB connections, currently uses smb_send() function for sending NetBIOS Session Request packet. This function expects that the passed buffer is SMB packet and for SMB2+ connections it mangles packet header, which breaks prepared NetBIOS Session Request packet. Result is that this function send garbage packet for SMB2+ connection, which SMB2+ server cannot parse. That function is not mangling packets for SMB1 connections, so it somehow works for SMB1. Fix this problem and instead of smb_send(), use smb_send_kvec() function which does not mangle prepared packet, this function send them as is. Just API of this function takes struct msghdr (kvec) instead of packet buffer. [MS-SMB2] specification allows SMB2 protocol to use NetBIOS as a transport protocol. NetBIOS can be used over TCP via port 139. So this is a valid configuration, just not so common. And even recent Windows versions (e.g. Windows Server 2022) still supports this configuration: SMB over TCP port 139, including for modern SMB2 and SMB3 dialects. This change fixes SMB2 and SMB3 connections over TCP port 139 which requires establishing of NetBIOS session. Tested that this change fixes establishing of SMB2 and SMB3 connections with Windows Server 2022. Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.