From 43537b8e2dc515e037e855504db3f6c7cf73c79f Mon Sep 17 00:00:00 2001 From: Willem de Bruijn Date: Fri, 12 Apr 2019 09:30:48 -0400 Subject: 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: 868d523535c2d ("bpf: add bpf_skb_adjust_room encap flags") Signed-off-by: Willem de Bruijn Reviewed-by: Alan Maguire Signed-off-by: Daniel Borkmann --- net/core/filter.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/core') diff --git a/net/core/filter.c b/net/core/filter.c index 95a27fdf9a40..bd1f51907b83 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -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) || -- cgit v1.2.3-59-g8ed1b