ACK: [PATCH 1/1] net: bpf: Allow TC programs to call BPF_FUNC_skb_change_head

[Kleber Souza]

On 08.10.20 16:07, Ian May wrote:
> From: Lorenzo Colitti <lorenzo at google.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1896504
> 
> This allows TC eBPF programs to modify and forward (redirect) packets
> from interfaces without ethernet headers (for example cellular)
> to interfaces with (for example ethernet/wifi).
> 
> The lack of this appears to simply be an oversight.
> 
> Tested:
>   in active use in Android R on 4.14+ devices for ipv6
>   cellular to wifi tethering offload.
> 
> Signed-off-by: Lorenzo Colitti <lorenzo at google.com>
> Signed-off-by: Maciej Żenczykowski <maze at google.com>
> Signed-off-by: Alexei Starovoitov <ast at kernel.org>
> (cherry picked from commit 6f3f65d80dac8f2bafce2213005821fccdce194c)
> Signed-off-by: Ian May <ian.may at canonical.com>

Acked-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>

> ---
>  net/core/filter.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 5c490d473df1..8340892884e8 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -6159,6 +6159,8 @@ tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
>  		return &bpf_skb_adjust_room_proto;
>  	case BPF_FUNC_skb_change_tail:
>  		return &bpf_skb_change_tail_proto;
> +	case BPF_FUNC_skb_change_head:
> +		return &bpf_skb_change_head_proto;
>  	case BPF_FUNC_skb_get_tunnel_key:
>  		return &bpf_skb_get_tunnel_key_proto;
>  	case BPF_FUNC_skb_set_tunnel_key:
>