Merge tag 'rxrpc-next-20201123' of git://git.kernel.org/pub/scm/linux/kernel/git...

Merge tag 'rxrpc-next-20201123' of git://git./linux/kernel/git/dhowells/linux-fs

David Howells says:

====================
rxrpc: Prelude to gssapi support

Here are some patches that do some reorganisation of the security class
handling in rxrpc to allow implementation of the RxGK security class that
will allow AF_RXRPC to use GSSAPI-negotiated tokens and better crypto.  The
RxGK security class is not included in this patchset.

It does the following things:

 (1) Add a keyrings patch to provide the original key description, as
     provided to add_key(), to the payload preparser so that it can
     interpret the content on that basis.  Unfortunately, the rxrpc_s key
     type wasn't written to interpret its payload as anything other than a
     string of bytes comprising a key, but for RxGK, more information is
     required as multiple Kerberos enctypes are supported.

 (2) Remove the rxk5 security class key parsing.  The rxk5 class never got
     rolled out in OpenAFS and got replaced with rxgk.

 (3) Support the creation of rxrpc keys with multiple tokens of different
     types.  If some types are not supported, the ENOPKG error is
     suppressed if at least one other token's type is supported.

 (4) Punt the handling of server keys (rxrpc_s type) to the appropriate
     security class.

 (5) Organise the security bits in the rxrpc_connection struct into a
     union to make it easier to override for other classes.

 (6) Move some bits from core code into rxkad that won't be appropriate to
     rxgk.

* tag 'rxrpc-next-20201123' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  rxrpc: Ask the security class how much space to allow in a packet
  rxrpc: rxkad: Don't use pskb_pull() to advance through the response packet
  rxrpc: Organise connection security to use a union
  rxrpc: Don't reserve security header in Tx DATA skbuff
  rxrpc: Merge prime_packet_security into init_connection_security
  rxrpc: Fix example key name in a comment
  rxrpc: Ignore unknown tokens in key payload unless no known tokens
  rxrpc: Make the parsing of xdr payloads more coherent
  rxrpc: Allow security classes to give more info on server keys
  rxrpc: Don't leak the service-side session key to userspace
  rxrpc: Hand server key parsing off to the security class
  rxrpc: Split the server key type (rxrpc_s) into its own file
  rxrpc: Don't retain the server key in the connection
  rxrpc: Support keys with multiple authentication tokens
  rxrpc: List the held token types in the key description in /proc/keys
  rxrpc: Remove the rxk5 security class as it's now defunct
  keys: Provide the original description to the key preparser
====================

Link: https://lore.kernel.org/r/160616220405.830164.2239716599743995145.stgit@warthog.procyon.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>