bpf: add bpf_skb_adjust_room flag BPF_F_ADJ_ROOM_FIXED_GSO

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bpf_skb_adjust_room adjusts gso_size of gso packets to account for the
pushed or popped header room.

This is not allowed with UDP, where gso_size delineates datagrams. Add
an option to avoid these updates and allow this call for datagrams.

It can also be used with TCP, when MSS is known to allow headroom,
e.g., through MSS clamping or route MTU.

Changes v1->v2:
  - document flag BPF_F_ADJ_ROOM_FIXED_GSO
  - do not expose BPF_F_ADJ_ROOM_MASK through uapi, as it may change.

Link: https://patchwork.ozlabs.org/patch/1052497/
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Willem de Bruijn 2019-03-22 14:32:55 -04:00 • committed by Alexei Starovoitov

parent 14aa31929b

commit 2278f6cc15

2 changed files with 34 additions and 13 deletions

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9

include/uapi/linux/bpf.h

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38

net/core/filter.c

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