netdev - [PATCH bpf-next] selftests/bpf: reserve flags in bpf_skb_net

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Date:   Fri, 12 Apr 2019 09:30:48 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     netdev@...r.kernel.org
Cc:     ast@...nel.org, daniel@...earbox.net, alan.maguire@...cle.com,
        Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH bpf-next] selftests/bpf: reserve flags in bpf_skb_net_shrink

From: Willem de Bruijn <willemb@...gle.com>

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 <willemb@...gle.com>
---
 net/core/filter.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index 95a27fdf9a405..bd1f51907b83b 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) ||
-- 
2.21.0.392.gf8f6787159e-goog