Network support for Landlock

Hi,
This is a new V12 patch related to Landlock LSM network confinement.
It is based on the landlock's -next branch on top of v6.5-rc6 kernel version:
https://git.kernel.org/pub/scm/linux/kernel/git/mic/linux...

It brings refactoring of previous patch version V11.
Mostly there are fixes of logic and typos, refactoring some selftests.

All test were run in QEMU evironment and compiled with
 -static flag.
 1. network_test: 77/77 tests passed.
 2. base_test: 7/7 tests passed.
 3. fs_test: 108/108 tests passed.
 4. ptrace_test: 8/8 tests passed.

Previous versions:
v11: https://lore.kernel.org/linux-security-module/20230515161...
v10: https://lore.kernel.org/linux-security-module/20230323085...
v9: https://lore.kernel.org/linux-security-module/20230116085...
v8: https://lore.kernel.org/linux-security-module/20221021152...
v7: https://lore.kernel.org/linux-security-module/20220829170...
v6: https://lore.kernel.org/linux-security-module/20220621082...
v5: https://lore.kernel.org/linux-security-module/20220516152...
v4: https://lore.kernel.org/linux-security-module/20220309134...
v3: https://lore.kernel.org/linux-security-module/20220124080...
v2: https://lore.kernel.org/linux-security-module/20211228115...
v1: https://lore.kernel.org/linux-security-module/20211210072...

Konstantin Meskhidze (11):
  landlock: Make ruleset's access masks more generic
  landlock: Refactor landlock_find_rule/insert_rule
  landlock: Refactor merge/inherit_ruleset functions
  landlock: Move and rename layer helpers
  landlock: Refactor layer helpers
  landlock: Refactor landlock_add_rule() syscall
  landlock: Add network rules and TCP hooks support
  selftests/landlock: Share enforce_ruleset()
  selftests/landlock: Add 7 new test variants dedicated to network
  samples/landlock: Add network demo
  landlock: Document Landlock's network support

Mickaël Salaün (1):
  landlock: Allow filesystem layout changes for domains without such
    rule type

 Documentation/userspace-api/landlock.rst     |   93 +-
 include/uapi/linux/landlock.h                |   47 +
 samples/landlock/sandboxer.c                 |  114 +-
 security/landlock/Kconfig                    |    3 +-
 security/landlock/Makefile                   |    2 +
 security/landlock/fs.c                       |  232 +--
 security/landlock/limits.h                   |    6 +
 security/landlock/net.c                      |  241 +++
 security/landlock/net.h                      |   35 +
 security/landlock/ruleset.c                  |  405 ++++-
 security/landlock/ruleset.h                  |  181 +-
 security/landlock/setup.c                    |    2 +
 security/landlock/syscalls.c                 |  122 +-
 tools/testing/selftests/landlock/base_test.c |    2 +-
 tools/testing/selftests/landlock/common.h    |   10 +
 tools/testing/selftests/landlock/config      |    4 +
 tools/testing/selftests/landlock/fs_test.c   |   75 +-
 tools/testing/selftests/landlock/net_test.c  | 1592 ++++++++++++++++++
 18 files changed, 2815 insertions(+), 351 deletions(-)
 create mode 100644 security/landlock/net.c
 create mode 100644 security/landlock/net.h
 create mode 100644 tools/testing/selftests/landlock/net_test.c

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2.25.1