Commit 43537b8e authored Apr 12, 2019 by Willem de Bruijn Committed by Daniel Borkmann Apr 16, 2019

bpf: reserve flags in bpf_skb_net_shrink



The ENCAP flags in bpf_skb_adjust_room are ignored on decap with
bpf_skb_net_shrink. Reserve these bits for future use.

Fixes: 868d5235 ("bpf: add bpf_skb_adjust_room encap flags")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

parent bfb35c27

net/core/filter.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -3069,6 +3069,9 @@ static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff,
		{
		int ret;

		if (flags & ~BPF_F_ADJ_ROOM_FIXED_GSO)
		return -EINVAL;

		if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) {
		/* udp gso_size delineates datagrams, only allow if fixed */
		if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) \|\|