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Commit d1988bf2 authored by Lorenzo Colitti's avatar Lorenzo Colitti Committed by Greg Kroah-Hartman
Browse files

net: bpf: Allow TC programs to call BPF_FUNC_skb_change_head 



commit 6f3f65d80dac8f2bafce2213005821fccdce194c upstream.

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: default avatarLorenzo Colitti <lorenzo@google.com>
Signed-off-by: default avatarMaciej Żenczykowski <maze@google.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 66bb2e2b

net/core/filter.c

+2 −0
Original line number Diff line number Diff line
@@ -6196,6 +6196,8 @@ 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: