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Message-Id: <20190401205734.4400-1-sdf@google.com> Date: Mon, 1 Apr 2019 13:57:29 -0700 From: Stanislav Fomichev <sdf@...gle.com> To: netdev@...r.kernel.org, bpf@...r.kernel.org Cc: davem@...emloft.net, ast@...nel.org, daniel@...earbox.net, simon.horman@...ronome.com, willemb@...gle.com, peterpenkov96@...il.com, Stanislav Fomichev <sdf@...gle.com> Subject: [PATCH bpf 0/5] flow_dissector: lay groundwork for calling BPF hook from eth_get_headlen This patch series fixes the existing BPF flow dissector API to support calling BPF progs from the eth_get_headlen context (the support itself will be added in bpf-next tree). The summary of the changes: * fix VLAN handling in bpf_flow.c, we don't need to peek back and look at skb->vlan_present; add selftests * pass and use flow_keys->n_proto instead of skb->protocol * fix clamping of flow_keys->nhoff for packets with nhoff > 0 * prohibit access to most of the __sk_buff fields from BPF flow dissector progs; only data/data_end/flow_keys are allowed (all input is now passed via flow_keys) * finally, document BPF flow dissector program environment Stanislav Fomichev (5): selftests/bpf: fix vlan handling in flow dissector program net/flow_dissector: pass flow_keys->n_proto to BPF programs flow_dissector: fix clamping of BPF flow_keys for non-zero nhoff flow_dissector: allow access only to a subset of __sk_buff fields flow_dissector: document BPF flow dissector environment .../networking/bpf_flow_dissector.txt | 115 ++++++++++++++++++ net/core/filter.c | 16 +-- net/core/flow_dissector.c | 4 +- .../selftests/bpf/prog_tests/flow_dissector.c | 68 +++++++++++ tools/testing/selftests/bpf/progs/bpf_flow.c | 19 ++- 5 files changed, 196 insertions(+), 26 deletions(-) create mode 100644 Documentation/networking/bpf_flow_dissector.txt -- 2.21.0.392.gf8f6787159e-goog
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