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| author | Daniel Borkmann <daniel@iogearbox.net> | 2016-08-18 01:00:39 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-08-19 08:38:16 +0200 |
| commit | 5293efe62df81908f2e90c9820c7edcc8e61f5e9 (patch) | |
| tree | 6e3456c7bd339b1ebcfcebae0de6286635d44f33 /mm/madvise.c | |
| parent | bpf: use skb_pkt_type_ok helper in bpf_skb_change_type (diff) | |
| download | linux-5293efe62df81908f2e90c9820c7edcc8e61f5e9.tar.xz linux-5293efe62df81908f2e90c9820c7edcc8e61f5e9.zip | |
bpf: add bpf_skb_change_tail helper
This work adds a bpf_skb_change_tail() helper for tc BPF programs. The
basic idea is to expand or shrink the skb in a controlled manner. The
eBPF program can then rewrite the rest via helpers like bpf_skb_store_bytes(),
bpf_lX_csum_replace() and others rather than passing a raw buffer for
writing here.
bpf_skb_change_tail() is really a slow path helper and intended for
replies with f.e. ICMP control messages. Concept is similar to other
helpers like bpf_skb_change_proto() helper to keep the helper without
protocol specifics and let the BPF program mangle the remaining parts.
A flags field has been added and is reserved for now should we extend
the helper in future.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'mm/madvise.c')
0 files changed, 0 insertions, 0 deletions