From 29d1b33a2e0a3288374102b004a15cb278a2303e Mon Sep 17 00:00:00 2001
From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Mon, 16 Oct 2017 16:40:56 -0700
Subject: [PATCH] bpf: allow access to skb->len from offloads

Since we are now doing strict checking of what offloads
may access, make sure skb->len is on that list.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/core/filter.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index 7373a08fbef7..09e011f20291 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3738,6 +3738,8 @@ tc_cls_act_is_valid_access_analyzer(int off, int size,
 				    struct bpf_insn_access_aux *info)
 {
 	switch (off) {
+	case offsetof(struct sk_buff, len):
+		return true;
 	case offsetof(struct sk_buff, data):
 		info->reg_type = PTR_TO_PACKET;
 		return true;
-- 
2.39.5