netdev - [PATCH net-next 4/4] bpf: allow access to skb->len from offloads

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Date:   Mon, 16 Oct 2017 16:40:56 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     netdev@...r.kernel.org
Cc:     oss-drivers@...ronome.com, alexei.starovoitov@...il.com,
        daniel@...earbox.net, Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net-next 4/4] 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@...ronome.com>
---
 net/core/filter.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index a908e5da5ffc..f8cd4d9aeb94 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3656,6 +3656,8 @@ 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;
-- 
2.14.1