net: bpf: Allow TC programs to call BPF_FUNC_skb_change_head

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@google.com>
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/net/core/filter.c b/net/core/filter.c
index a605626..da3b7a7 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6137,6 +6137,8 @@ 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: