Re: [PATCH v2 3/5] bpf: add helper masks for ADJ_ROOM flags and encap validation

[Willem de Bruijn]

Nick Hudson wrote:
> Introduce helper masks for bpf_skb_adjust_room() flags to simplify
> validation logic:
> 
> - BPF_F_ADJ_ROOM_DECAP_L4_MASK
> - BPF_F_ADJ_ROOM_DECAP_IPXIP_MASK
> - BPF_F_ADJ_ROOM_ENCAP_MASK
> - BPF_F_ADJ_ROOM_DECAP_MASK
> 
> Add flag validation to bpf_skb_net_grow() to reject invalid encap
> flags early. Refactor existing validation checks in bpf_skb_net_shrink()
> and bpf_skb_adjust_room() to use the new masks (no behavior change).
> 
> Co-developed-by: Max Tottenham <mtottenh@xxxxxxxxxx>
> Signed-off-by: Max Tottenham <mtottenh@xxxxxxxxxx>
> Co-developed-by: Anna Glasgall <aglasgal@xxxxxxxxxx>
> Signed-off-by: Anna Glasgall <aglasgal@xxxxxxxxxx>
> Signed-off-by: Nick Hudson <nhudson@xxxxxxxxxx>

Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>