From: Lorenz Bauer <lmb@cloudflare.com>
To: ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org,
bpf@vger.kernel.org
Cc: kafai@fb.com, Lorenz Bauer <lmb@cloudflare.com>
Subject: [PATCH v2 0/8] Allow checking SYN cookies from XDP and tc cls act
Date: Tue, 19 Mar 2019 10:20:55 +0000 [thread overview]
Message-ID: <20190319102103.7380-1-lmb@cloudflare.com> (raw)
In-Reply-To: <20190222095057.9442-1-lmb@cloudflare.com>
This series adds the necessary helpers to determine wheter a given
(encapsulated) TCP packet belongs to a connection known to the network stack.
* bpf_skc_lookup_tcp gives access to request and timewait sockets
* bpf_tcp_check_syncookie identifies the final 3WHS ACK when syncookies
are enabled
The goal is to be able to implement load-balancing approaches like
glb-director [1] or Beamer [2] in pure eBPF. Specifically, we'd like to replace
the functionality of the glb-redirect kernel module [3] by an XDP program or
tc classifier.
Apologies for submitting during the merge window. Thanks to Martin KaFai Lau
for his review!
Changes in v2:
* Rename bpf_sk_check_syncookie to bpf_tcp_check_syncookie.
* Add bpf_skc_lookup_tcp. Without it bpf_tcp_check_syncookie doesn't make sense.
* Check tcp_synq_no_recent_overflow() in bpf_tcp_check_syncookie.
* Check th->syn in bpf_tcp_check_syncookie.
* Require CONFIG_IPV6 to be a built in.
1: https://github.com/github/glb-director
2: https://www.usenix.org/conference/nsdi18/presentation/olteanu
3: https://github.com/github/glb-director/tree/master/src/glb-redirect
Lorenz Bauer (8):
bpf: track references based on is_acquire_func
bpf: allow helpers to return PTR_TO_SOCK_COMMON
bpf: add skc_lookup_tcp helper
bpf: add helper to check for a valid SYN cookie
tools: update include/uapi/linux/bpf.h
selftests/bpf: allow specifying helper for BPF_SK_LOOKUP
selftests/bpf: test references to sock_common
selftests/bpf: add tests for bpf_tcp_check_syncookie and
bpf_skc_lookup_tcp
include/linux/bpf.h | 1 +
include/uapi/linux/bpf.h | 36 ++-
kernel/bpf/verifier.c | 33 +--
net/core/filter.c | 185 ++++++++++++++-
tools/include/uapi/linux/bpf.h | 36 ++-
tools/testing/selftests/bpf/.gitignore | 1 +
tools/testing/selftests/bpf/Makefile | 5 +-
tools/testing/selftests/bpf/bpf_helpers.h | 8 +
.../bpf/progs/test_tcp_check_syncookie_kern.c | 126 +++++++++++
.../selftests/bpf/test_tcp_check_syncookie.sh | 81 +++++++
.../bpf/test_tcp_check_syncookie_user.c | 212 ++++++++++++++++++
tools/testing/selftests/bpf/test_verifier.c | 6 +-
.../selftests/bpf/verifier/ref_tracking.c | 126 +++++++----
tools/testing/selftests/bpf/verifier/unpriv.c | 8 +-
14 files changed, 789 insertions(+), 75 deletions(-)
create mode 100644 tools/testing/selftests/bpf/progs/test_tcp_check_syncookie_kern.c
create mode 100755 tools/testing/selftests/bpf/test_tcp_check_syncookie.sh
create mode 100644 tools/testing/selftests/bpf/test_tcp_check_syncookie_user.c
--
2.19.1
next prev parent reply other threads:[~2019-03-19 10:21 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-22 9:50 [PATCH 0/3] Allow checking SYN cookies from XDP and tc cls act Lorenz Bauer
2019-02-22 9:50 ` [PATCH 1/3] bpf: add helper to check for a valid SYN cookie Lorenz Bauer
2019-02-23 0:44 ` Martin Lau
2019-02-25 18:26 ` Lorenz Bauer
2019-02-26 5:37 ` Martin Lau
2019-02-28 15:11 ` Lorenz Bauer
2019-02-28 17:37 ` Martin Lau
2019-02-24 11:21 ` kbuild test robot
2019-02-24 11:37 ` kbuild test robot
2019-02-22 9:50 ` [PATCH 2/3] tools: sync changes to uapi/linux/bpf.h Lorenz Bauer
2019-02-22 9:50 ` [PATCH 3/3] selftests/bpf: add tests for bpf_sk_check_syncookie Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 0/8] Allow checking SYN cookies from XDP and tc cls act Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 1/8] bpf: track references based on is_acquire_func Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 2/8] bpf: allow helpers to return PTR_TO_SOCK_COMMON Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 3/8] bpf: add skc_lookup_tcp helper Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 4/8] bpf: add helper to check for a valid SYN cookie Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 5/8] tools: update include/uapi/linux/bpf.h Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 6/8] selftests/bpf: allow specifying helper for BPF_SK_LOOKUP Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 7/8] selftests/bpf: test references to sock_common Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 8/8] selftests/bpf: add tests for bpf_tcp_check_syncookie and bpf_skc_lookup_tcp Lorenz Bauer
2019-03-15 20:42 ` [PATCH v2 0/8] Allow checking SYN cookies from XDP and tc cls act Alexei Starovoitov
2019-03-19 10:20 ` Lorenz Bauer [this message]
2019-03-19 10:20 ` [PATCH v2 1/8] bpf: track references based on is_acquire_func Lorenz Bauer
2019-03-19 10:20 ` [PATCH v2 2/8] bpf: allow helpers to return PTR_TO_SOCK_COMMON Lorenz Bauer
2019-03-19 10:20 ` [PATCH v2 3/8] bpf: add skc_lookup_tcp helper Lorenz Bauer
2019-03-19 21:30 ` Alexei Starovoitov
2019-03-19 10:20 ` [PATCH v2 4/8] bpf: add helper to check for a valid SYN cookie Lorenz Bauer
2019-03-19 22:17 ` Alexei Starovoitov
2019-03-21 2:09 ` Lorenz Bauer
2019-03-21 3:03 ` Alexei Starovoitov
2019-03-21 4:53 ` Lorenz Bauer
2019-03-21 5:50 ` Alexei Starovoitov
2019-03-19 10:21 ` [PATCH v2 5/8] tools: update include/uapi/linux/bpf.h Lorenz Bauer
2019-03-19 10:21 ` [PATCH v2 6/8] selftests/bpf: allow specifying helper for BPF_SK_LOOKUP Lorenz Bauer
2019-03-19 10:21 ` [PATCH v2 7/8] selftests/bpf: test references to sock_common Lorenz Bauer
2019-03-19 10:21 ` [PATCH v2 8/8] selftests/bpf: add tests for bpf_tcp_check_syncookie and bpf_skc_lookup_tcp Lorenz Bauer
2019-03-22 1:53 ` [PATCH bpf-next v3 0/8] Allow checking SYN cookies from XDP and tc cls act Lorenz Bauer
2019-03-22 1:53 ` [PATCH bpf-next v3 1/8] bpf: track references based on is_acquire_func Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 2/8] bpf: allow helpers to return PTR_TO_SOCK_COMMON Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 3/8] bpf: add skc_lookup_tcp helper Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 4/8] bpf: add helper to check for a valid SYN cookie Lorenz Bauer
2019-03-22 2:06 ` Alexei Starovoitov
2019-03-22 2:52 ` Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 5/8] tools: update include/uapi/linux/bpf.h Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 6/8] selftests/bpf: allow specifying helper for BPF_SK_LOOKUP Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 7/8] selftests/bpf: test references to sock_common Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 8/8] selftests/bpf: add tests for bpf_tcp_check_syncookie and bpf_skc_lookup_tcp Lorenz Bauer
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