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  1. 17 Aug, 2016 3 commits
    • Tom Herbert's avatar
      strparser: Stream parser for messages · 43a0c675
      Tom Herbert authored 
      This patch introduces a utility for parsing application layer protocol
messages in a TCP stream. This is a generalization of the mechanism
implemented of Kernel Connection Multiplexor.

The API includes a context structure, a set of callbacks, utility
functions, and a data ready function.

A stream parser instance is defined by a strparse structure that
is bound to a TCP socket. The function to initialize the structure
is:

int strp_init(struct strparser *strp, struct sock *csk,
              struct strp_callbacks *cb);

csk is the TCP socket being bound to and cb are the parser callbacks.

The upper layer calls strp_tcp_data_ready when data is ready on the lower
socket for strparser to process. This should be called from a data_ready
callback that is set on the socket:

void strp_tcp_data_ready(struct strparser *strp);

A parser is bound to a TCP socket by setting data_ready function to
strp_tcp_data_ready so that all receive indications on the socket
go through the parser. This is assumes that sk_user_data is set to
the strparser structure.

There are four callbacks.
 - parse_msg is called to parse the message (returns length or error).
 - rcv_msg is called when a complete message has been received
 - read_sock_done is called when data_ready function exits
 - abort_parser is called to abort the parser

The input to parse_msg is an skbuff which contains next message under
construction. The backend processing of parse_msg will parse the
application layer protocol headers to determine the length of
the message in the stream. The possible return values are:

   >0 : indicates length of successfully parsed message
   0  : indicates more data must be received to parse the message
   -ESTRPIPE : current message should not be processed by the
      kernel, return control of the socket to userspace which
      can proceed to read the messages itself
   other < 0 : Error is parsing, give control back to userspace
      assuming that synchronzation is lost and the stream
      is unrecoverable (application expected to close TCP socket)

In the case of error return (< 0) strparse will stop the parser
and report and error to userspace. The application must deal
with the error. To handle the error the strparser is unbound
from the TCP socket. If the error indicates that the stream
TCP socket is at recoverable point (ESTRPIPE) then the application
can read the TCP socket to process the stream. Once the application
has dealt with the exceptions in the stream, it may again bind the
socket to a strparser to continue data operations.

Note that ENODATA may be returned to the application. In this case
parse_msg returned -ESTRPIPE, however strparser was unable to maintain
synchronization of the stream (i.e. some of the message in question
was already read by the parser).

strp_pause and strp_unpause are used to provide flow control. For
instance, if rcv_msg is called but the upper layer can't immediately
consume the message it can hold the message and pause strparser.
Signed-off-by: default avatarTom Herbert <tom@herbertland.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      43a0c675
    • Thierry Reding's avatar
      net: ipconfig: Fix more use after free · d2d371ae
      Thierry Reding authored 
      While commit 9c706a49 ("net: ipconfig: fix use after free") avoids
the use after free, the resulting code still ends up calling both the
ic_setup_if() and ic_setup_routes() after calling ic_close_devs(), and
access to the device is still required.

Move the call to ic_close_devs() to the very end of the function.
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d2d371ae
    • David S. Miller's avatar
      Merge tag 'batadv-next-for-davem-20160816' of git://git.open-mesh.org/linux-merge · 00062a93
      David S. Miller authored 
      Simon Wunderlich says:

====================
pull request for net-next: batman-adv 2016-08-16

This feature patchset is all about adding netlink support, which should
supersede our debugfs configuration interface in the long run. It is
especially necessary when batman-adv should be used in different
namespaces, since debugfs can not differentiate between those.

More specifically, the following changes are included:

 - Two fixes for namespace handling by Andrew Lunn, checking also the
   namespaces for parent interfaces, and supress debugfs entries
   for non-default netns

 - Implement various netlink commands for the new interface, by
   Matthias Schiffer, Andrew Lunn, Sven Eckelmann and Simon Wunderlich
   (13 patches):
    * routing algorithm list
    * hardif list
    * translation tables (local and global)
    * TTVN for the translation tables
    * originator and neighbor tables for B.A.T.M.A.N. IV
      and B.A.T.M.A.N. V
    * gateway dump functionality for B.A.T.M.A.N. IV
      and B.A.T.M.A.N. V
    * Bridge Loop Avoidance claims, and corresponding BLA group
    * Bridge Loop Avoidance backbone tables

 - Finally, mark batman-adv as netns compatible, by Andrew Lunn (1 patch)
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      00062a93
  3. 15 Aug, 2016 30 commits
  5. 13 Aug, 2016 7 commits
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