From: Lorenzo Colitti <lorenzo@google.com>
Date: Mon, 20 Apr 2020 11:34:08 -0700
Subject: net: bpf: Allow TC programs to call BPF_FUNC_skb_change_head
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Content-Transfer-Encoding: 8bit
Patch-mainline: v5.8-rc1
Git-commit: 6f3f65d80dac8f2bafce2213005821fccdce194c
References: bsc#1177028

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>
Acked-by: Gary Lin <glin@suse.com>
---
 net/core/filter.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6137,6 +6137,8 @@ tc_cls_act_func_proto(enum bpf_func_id f
 		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: