Support direct writes to nf_conn:mark from TC and XDP prog types. This is useful when applications want to store per-connection metadata. This is also particularly useful for applications that run both bpf and iptables/nftables because the latter can trivially access this metadata. One example use case would be if a bpf prog is responsible for advanced packet classification and iptables/nftables is later used for routing due to pre-existing/legacy code. Daniel Xu (3): bpf: Remove duplicate PTR_TO_BTF_ID RO check bpf: Add support for writing to nf_conn:mark selftests/bpf: Add tests for writing to nf_conn:mark include/net/netfilter/nf_conntrack_bpf.h | 18 +++++++ kernel/bpf/verifier.c | 3 -- net/core/filter.c | 34 +++++++++++++ net/netfilter/nf_conntrack_bpf.c | 50 +++++++++++++++++++ .../testing/selftests/bpf/prog_tests/bpf_nf.c | 1 + .../testing/selftests/bpf/progs/test_bpf_nf.c | 6 ++- .../selftests/bpf/progs/test_bpf_nf_fail.c | 14 ++++++ 7 files changed, 121 insertions(+), 5 deletions(-) -- 2.37.1
