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Nick Hudson 19e98d95e9 bpf: Add BPF_F_ADJ_ROOM_DECAP_* flags for tunnel decapsulation

Add new bpf_skb_adjust_room() decapsulation flags:

- BPF_F_ADJ_ROOM_DECAP_L4_GRE
- BPF_F_ADJ_ROOM_DECAP_L4_UDP
- BPF_F_ADJ_ROOM_DECAP_IPXIP4
- BPF_F_ADJ_ROOM_DECAP_IPXIP6

These flags let BPF programs describe which tunnel layer is being
removed, so later changes can update tunnel-related GSO state
accordingly during decapsulation.

This patch only introduces the UAPI flag definitions and helper
documentation.

Co-developed-by: Max Tottenham <mtottenh@akamai.com>
Co-developed-by: Anna Glasgall <aglasgal@akamai.com>
Signed-off-by: Max Tottenham <mtottenh@akamai.com>
Signed-off-by: Anna Glasgall <aglasgal@akamai.com>
Signed-off-by: Nick Hudson <nhudson@akamai.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/bpf/20260812083115.73100-4-nhudson@akamai.com

2026-10-02 05:41:50 -07:00

bpf_common.h

sync: one-time strip out _UAPI prefix from UAPI header guards

2025-06-13 13:18:23 -07:00

bpf.h

bpf: Add BPF_F_ADJ_ROOM_DECAP_* flags for tunnel decapsulation

2026-10-02 05:41:50 -07:00

btf.h

bpf: Extend BTF UAPI vlen, kinds to use unused bits

2026-05-30 20:45:51 -07:00

fcntl.h

fs: support FD_FAILFS_ROOT in fchdir()