[bpf-next PATCH 0/7] Add BPF_PROG_TYPE_SK_MSG and attach pt

John Fastabend
2018-01-12T18:09:59Z

This series include 4 setup patches (1-4) to allow ULP layer and
sockmap refcounting to support another ULP type. There is one small
change (5 lines!) on the TCP side in patch 4. This adds a flag so
that the ULP layer can inform the TCP stack not to mark the frags
as shared. When the ULP layer "owns" the frags and 'gives' them
to the TCP stack we know there can be no additional updates from
user side to the data.

Patch 4 is the bulk of the work. This adds a new program type
BPF_PROG_TYPE_SK_MSG, a sockmap program attach type
BPF_SK_MSG_VERDICT and a new ULP layer (TCP_ULP_BPF) to allow BPF
prgrams to be run on sendmsg/sendfile system calls and inspect data.
For now only TCP is supported when sockmap is extended other protos
can be added. See the patch description for a lengthy description
of the details. After this patch users can now attach BPF policy
and monitoring programs to socket send hooks.

Finally patches 6/7 and 7/7 add tests to test_maps and the verifier
in selftests/bpf so we get some automated coverage. One open
question I have is if we should move the samples/sockmap program
into selftests/bpf and start running it to get even more coverage
on the automated side. We can push this as an independent patch
set.

---

John Fastabend (7):
net: add a UID to use for ULP socket assignment
sock: make static tls function alloc_sg generic sock helper
sockmap: convert refcnt to an atomic refcnt
net: do_tcp_sendpages flag to avoid SKBTX_SHARED_FRAG
bpf: create tcp_bpf_ulp allowing BPF to monitor socket TX/RX data
bpf: add map tests for BPF_PROG_TYPE_SK_MSG
bpf: add verifier tests for BPF_PROG_TYPE_SK_MSG

include/linux/bpf.h | 1
include/linux/bpf_types.h | 1
include/linux/filter.h | 10
include/linux/socket.h | 1
include/net/sock.h | 4
include/net/tcp.h | 7
include/uapi/linux/bpf.h | 28 +
kernel/bpf/sockmap.c | 504 +++++++++++++++++++-
kernel/bpf/syscall.c | 14 -
kernel/bpf/verifier.c | 5
net/core/filter.c | 106 ++++
net/core/sock.c | 56 ++
net/ipv4/tcp.c | 4
net/ipv4/tcp_ulp.c | 51 ++
net/tls/tls_main.c | 1
net/tls/tls_sw.c | 69 ---
tools/include/uapi/linux/bpf.h | 16 +
tools/testing/selftests/bpf/Makefile | 3
tools/testing/selftests/bpf/bpf_helpers.h | 2
tools/testing/selftests/bpf/sockmap_parse_prog.c | 15 +
tools/testing/selftests/bpf/sockmap_verdict_prog.c | 7
tools/testing/selftests/bpf/test_maps.c | 54 ++
tools/testing/selftests/bpf/test_verifier.c | 54 ++
23 files changed, 913 insertions(+), 100 deletions(-)