[MPTCP] [PATCH mptcp-next v2 0/3] bpf: add MPTCP subflow support

[MPTCP] [PATCH mptcp-next v2 0/3] bpf: add MPTCP subflow support

[Nicolas Rybowski]

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Previously it was not possible to make a distinction between plain TCP
sockets and MPTCP subflow sockets on the BPF_PROG_TYPE_SOCK_OPS hook.

This patch series now enables a fine control of subflow sockets. In its
current state, it allows to put different sockopt on each subflow from a
same MPTCP connection (socket mark, TCP congestion algorithm, ...) using
BPF programs.

It should also be the basis of exposing MPTCP-specific fields through BPF.

v1 -> v2:
- update cgroup attachment code in net/mptcp/subflow.c due to additional #ifdef
- revert MPTCP private structure moving in public API (previous patch 3)
- move new BPF helper implementation in net/mptcp/bpf.c
- add bpf.c in Makefile of net/mptcp
- minor cosmetic changes: alignment of function's arguments on open
	parenthesis

Nicolas Rybowski (3):
  bpf: expose is_mptcp flag to bpf_tcp_sock
  mptcp: attach subflow socket to parent cgroup
  bpf: add 'bpf_mptcp_sock' structure and helper

 include/linux/bpf.h            | 33 ++++++++++++++++
 include/uapi/linux/bpf.h       | 14 +++++++
 kernel/bpf/verifier.c          | 30 ++++++++++++++
 net/core/filter.c              | 13 +++++-
 net/mptcp/Makefile             |  2 +
 net/mptcp/bpf.c                | 72 ++++++++++++++++++++++++++++++++++
 net/mptcp/subflow.c            | 27 +++++++++++++
 scripts/bpf_helpers_doc.py     |  2 +
 tools/include/uapi/linux/bpf.h | 14 +++++++
 9 files changed, 206 insertions(+), 1 deletion(-)
 create mode 100644 net/mptcp/bpf.c

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2.28.0