netdev - [PATCH v2 bpf-next 0/3] bpf: Add sock_ops_get

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Message-Id: <20200218091541.107371-1-forrest0579@gmail.com>
Date:   Tue, 18 Feb 2020 09:15:38 +0000
From:   Lingpeng Chen <forrest0579@...il.com>
To:     bpf <bpf@...r.kernel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Petar Penkov <ppenkov.kernel@...il.com>,
        Lingpeng Chen <forrest0579@...il.com>
Subject: [PATCH v2 bpf-next 0/3] bpf: Add sock_ops_get_netns helpers

Currently 5-tuple(sip+dip+sport+dport+proto) can't identify a
uniq connection because there may be multi net namespace.
For example, there may be a chance that netns a and netns b all
listen on 127.0.0.1:8080 and the client with same port 40782
connect to them. Without netns number, sock ops program
can't distinguish them.
Using bpf_sock_ops_get_netns helpers to get current connection
netns number to distinguish connections.

Changes in v2:
- Return u64 instead of u32 for sock_ops_get_netns
- Fix build bug when CONFIG_NET_NS not set
- Add selftest for sock_ops_get_netns

Lingpeng Chen (3):
  bpf: Add sock ops get netns helpers
  bpf: Sync uapi bpf.h to tools/
  selftests/bpf: add selftest for sock_ops_get_netns helper

 include/uapi/linux/bpf.h                      |  8 +++-
 net/core/filter.c                             | 19 ++++++++
 tools/include/uapi/linux/bpf.h                |  8 +++-
 .../selftests/bpf/progs/test_tcpbpf_kern.c    | 11 +++++
 .../testing/selftests/bpf/test_tcpbpf_user.c  | 46 ++++++++++++++++++-
 5 files changed, 89 insertions(+), 3 deletions(-)


base-commit bb6d3fb354c5 ("Linux 5.6-rc1")
-- 
2.20.1