linux-kernel - [PATCH v4 0/7] TCP-AO fixes

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Message-ID: <20231129165721.337302-1-dima@arista.com>
Date:   Wed, 29 Nov 2023 16:57:14 +0000
From:   Dmitry Safonov <dima@...sta.com>
To:     David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org, Dmitry Safonov <dima@...sta.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        Salam Noureddine <noureddine@...sta.com>,
        Simon Horman <horms@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH v4 0/7] TCP-AO fixes

Hi,

Changes from v3:
- Don't restrict adding any keys on TCP-AO connection in VRF, but only
  the ones that don't match l3index (David)

Changes from v2:
- rwlocks are problematic in net code (Paolo)
  Changed the SNE code to avoid spin/rw locks on RX/TX fastpath by
  double-accounting SEQ numbers for TCP-AO enabled connections.

Changes from v1:
- Use tcp_can_repair_sock() helper to limit TCP_AO_REPAIR (Eric)
- Instead of hook to listen() syscall, allow removing current/rnext keys
  on TCP_LISTEN (addressing Eric's objection)
- Add sne_lock to protect snd_sne/rcv_sne
- Don't move used_tcp_ao in struct tcp_request_sock (Eric)

I've been working on TCP-AO key-rotation selftests and as a result
exercised some corner-cases that are not usually met in production.

Here are a bunch of semi-related fixes:
- Documentation typo (reported by Markus Elfring)
- Proper alignment for TCP-AO option in TCP header that has MAC length
  of non 4 bytes (now a selftest with randomized maclen/algorithm/etc
  passes)
- 3 uAPI restricting patches that disallow more things to userspace in
  order to prevent it shooting itself in any parts of the body
- SNEs READ_ONCE()/WRITE_ONCE() that went missing by my human factor
- Avoid storing MAC length from SYN header as SYN-ACK will use
  rnext_key.maclen (drops an extra check that fails on new selftests)

Please, consider applying/pulling.

The following changes since commit 3b47bc037bd44f142ac09848e8d3ecccc726be99:

  Merge tag 'pinctrl-v6.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl (2023-11-29 06:45:22 -0800)

are available in the Git repository at:

  git@...hub.com:0x7f454c46/linux.git tcp-ao-post-merge-v4

for you to fetch changes up to adb1a6e8d2034c1e17b6a84a512c71aa4c41c1d2:

  net/tcp: Don't store TCP-AO maclen on reqsk (2023-11-29 16:14:14 +0000)

----------------------------------------------------------------

Thanks,
             Dmitry

Cc: David Ahern <dsahern@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Dmitry Safonov <0x7f454c46@...il.com>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Francesco Ruggeri <fruggeri05@...il.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Salam Noureddine <noureddine@...sta.com>
Cc: Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org

Dmitry Safonov (7):
  Documentation/tcp: Fix an obvious typo
  net/tcp: Consistently align TCP-AO option in the header
  net/tcp: Limit TCP_AO_REPAIR to non-listen sockets
  net/tcp: Allow removing current/rnext TCP-AO keys on TCP_LISTEN
    sockets
  net/tcp: Don't add key with non-matching VRF on connected sockets
  net/tcp: Store SNEs + SEQs on ao_info
  net/tcp: Don't store TCP-AO maclen on reqsk

 Documentation/networking/tcp_ao.rst |  2 +-
 include/linux/tcp.h                 |  8 +--
 include/net/tcp_ao.h                | 31 +++++++++--
 net/ipv4/tcp.c                      | 13 ++++-
 net/ipv4/tcp_ao.c                   | 80 ++++++++++++++++++-----------
 net/ipv4/tcp_fastopen.c             |  2 +
 net/ipv4/tcp_input.c                | 26 ++++++----
 net/ipv4/tcp_ipv4.c                 |  4 +-
 net/ipv4/tcp_minisocks.c            |  2 +-
 net/ipv4/tcp_output.c               | 16 +++---
 net/ipv6/tcp_ipv6.c                 |  2 +-
 11 files changed, 122 insertions(+), 64 deletions(-)


base-commit: 3b47bc037bd44f142ac09848e8d3ecccc726be99
-- 
2.43.0