This patchset adds support for:
- direct R or R/W access to many tcp_sock fields
- passing up to 4 arguments to sock_ops BPF functions
- tcp_sock field bpf_sock_ops_cb_flags for controlling callbacks
- optionally calling sock_ops BPF program when RTO fires
- optionally calling sock_ops BPF program when packet is retransmitted
- optionally calling sock_ops BPF program when TCP state changes
- access to tclass and sk_txhash
- new selftest
v2: Fixed commit message 0/11. The commit is to "bpf-next" but the patch
below used "bpf" and Patchwork didn't work correctly.
v3: Cleaned RTO callback as per Yuchung's comment
Added BPF enum for TCP states as per Alexei's comment
v4: Fixed compile warnings related to detecting changes between TCP
internal states and the BPF defined states.
v5: Fixed comment issues in some selftest files
Fixed accesss issue with u64 fields in bpf_sock_ops struct
v6: Made fixes based on comments form Eric Dumazet:
The field bpf_sock_ops_cb_flags was addded in a hole on 64bit kernels
Field bpf_sock_ops_cb_flags is now set through a helper function
which returns an error when a BPF program tries to set bits for
callbacks that are not supported in the current kernel.
Added a comment indicating that when adding fields to bpf_sock_ops_kern
they should be added before the field named "temp" if they need to be
cleared before calling the BPF function.
v7: Enfornced fields "op" and "replylong[1] .. replylong[3]" not be writable
based on comments form Eric Dumazet and Alexei Starovoitov.
Filled 32 bit hole in bpf_sock_ops struct with sk_txhash based on
comments from Daniel Borkmann.
Removed unused functions (tcp_call_bpf_1arg, tcp_call_bpf_4arg) based
on comments from Daniel Borkmann.
v8: Add commit message 00/12
Add Acked-by as appropriate
v9: Moved the bug fix to the front of the patchset
Changed RETRANS_CB so it is always called (before it was only called if
the retransmit succeeded). It is now called with an extra argument, the
return value of tcp_transmit_skb (0 => success). Based on comments
from Yuchung Cheng.
Added support for reading 2 new fields, sacked_out and lost_out, based on
comments from Yuchung Cheng.
Consists of the following patches:
[PATCH bpf-next v9 01/12] bpf: Only reply field should be writeable
[PATCH bpf-next v9 02/12] bpf: Make SOCK_OPS_GET_TCP size independent
[PATCH bpf-next v9 03/12] bpf: Make SOCK_OPS_GET_TCP struct
[PATCH bpf-next v9 04/12] bpf: Add write access to tcp_sock and sock
[PATCH bpf-next v9 05/12] bpf: Support passing args to sock_ops bpf
[PATCH bpf-next v9 06/12] bpf: Adds field bpf_sock_ops_cb_flags to
[PATCH bpf-next v9 07/12] bpf: Add sock_ops RTO callback
[PATCH bpf-next v9 08/12] bpf: Add support for reading sk_state and
[PATCH bpf-next v9 09/12] bpf: Add sock_ops R/W access to tclass
[PATCH bpf-next v9 10/12] bpf: Add BPF_SOCK_OPS_RETRANS_CB
[PATCH bpf-next v9 11/12] bpf: Add BPF_SOCK_OPS_STATE_CB
[PATCH bpf-next v9 12/12] bpf: add selftest for tcpbpf
include/linux/filter.h | 10 ++
include/linux/tcp.h | 11 ++
include/net/tcp.h | 42 ++++-
include/uapi/linux/bpf.h | 76 +++++++-
include/uapi/linux/tcp.h | 8 +
net/core/filter.c | 290
++++++++++++++++++++++++++++---
net/ipv4/tcp.c | 26 ++-
net/ipv4/tcp_nv.c | 2 +-
net/ipv4/tcp_output.c | 6 +-
net/ipv4/tcp_timer.c | 7 +
tools/include/uapi/linux/bpf.h | 78 ++++++++-
tools/testing/selftests/bpf/Makefile | 4 +-
tools/testing/selftests/bpf/bpf_helpers.h | 2 +
tools/testing/selftests/bpf/tcp_client.py | 52 ++++++
tools/testing/selftests/bpf/tcp_server.py | 79 +++++++++
tools/testing/selftests/bpf/test_tcpbpf.h | 16 ++
tools/testing/selftests/bpf/test_tcpbpf_kern.c | 131 ++++++++++++++
tools/testing/selftests/bpf/test_tcpbpf_user.c | 126 ++++++++++++++
18 files changed, 927 insertions(+), 39 deletions(-)
