netdev - [PATCH bpf-next v3 0/4] Expose network namespace cookies to user space

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Message-Id: <20210219154330.93615-1-lmb@cloudflare.com>
Date:   Fri, 19 Feb 2021 15:43:26 +0000
From:   Lorenz Bauer <lmb@...udflare.com>
To:     eric.dumazet@...il.com, daniel@...earbox.net, ast@...nel.org,
        andrii@...nel.org
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        kernel-team@...udflare.com, Lorenz Bauer <lmb@...udflare.com>
Subject: [PATCH bpf-next v3 0/4] Expose network namespace cookies to user space

We're working on a user space control plane for the BPF sk_lookup
hook [1]. The hook attaches to a network namespace and allows
control over which socket receives a new connection / packet.

I'm proposing to add a new getsockopt and a netns ioctl to retrieve
netns cookies, which allows identifying which netns a socket belongs
to.

1: https://www.kernel.org/doc/html/latest/bpf/prog_sk_lookup.html

Changes in v3:
- Use sock_net unconditionally
- Fix unused variable in nsfs ioctl
- Be strict about getsockopt value size

Changes in v2:
- Rebase on top of Eric Dumazet's netns cookie simplification

Lorenz Bauer (4):
  net: add SO_NETNS_COOKIE socket option
  nsfs: add an ioctl to discover the network namespace cookie
  tools/testing: add test for NS_GET_COOKIE
  tools/testing: add a selftest for SO_NETNS_COOKIE

 arch/alpha/include/uapi/asm/socket.h          |  2 +
 arch/mips/include/uapi/asm/socket.h           |  2 +
 arch/parisc/include/uapi/asm/socket.h         |  2 +
 arch/sparc/include/uapi/asm/socket.h          |  2 +
 fs/nsfs.c                                     |  7 +++
 include/uapi/asm-generic/socket.h             |  2 +
 include/uapi/linux/nsfs.h                     |  2 +
 net/core/sock.c                               |  7 +++
 tools/testing/selftests/net/.gitignore        |  1 +
 tools/testing/selftests/net/Makefile          |  2 +-
 tools/testing/selftests/net/config            |  1 +
 tools/testing/selftests/net/so_netns_cookie.c | 61 +++++++++++++++++++
 tools/testing/selftests/nsfs/.gitignore       |  1 +
 tools/testing/selftests/nsfs/Makefile         |  2 +-
 tools/testing/selftests/nsfs/config           |  1 +
 tools/testing/selftests/nsfs/netns.c          | 57 +++++++++++++++++
 16 files changed, 150 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/net/so_netns_cookie.c
 create mode 100644 tools/testing/selftests/nsfs/netns.c

-- 
2.27.0