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
