Wrap the code to rebuild the ethernet + vlan header into a function.
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/netfilter/nft_payload.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c
index 87f6f5269be6..5676e22b36bc 100644
--- a/net/netfilter/nft_payload.c
+++ b/net/netfilter/nft_payload.c
@@ -23,6 +23,19 @@
#include <linux/ip.h>
#include <linux/ipv6.h>
+static bool nft_payload_rebuild_vlan_hdr(const struct sk_buff *skb, int mac_off,
+ struct vlan_ethhdr *veth)
+{
+ if (skb_copy_bits(skb, mac_off, veth, ETH_HLEN))
+ return false;
+
+ veth->h_vlan_proto = skb->vlan_proto;
+ veth->h_vlan_TCI = htons(skb_vlan_tag_get(skb));
+ veth->h_vlan_encapsulated_proto = skb->protocol;
+
+ return true;
+}
+
/* add vlan header into the user buffer for if tag was removed by offloads */
static bool
nft_payload_copy_vlan(u32 *d, const struct sk_buff *skb, u8 offset, u8 len)
@@ -35,13 +48,9 @@ nft_payload_copy_vlan(u32 *d, const struct sk_buff *skb, u8 offset, u8 len)
if (offset < VLAN_ETH_HLEN) {
u8 ethlen = len;
- if (skb_copy_bits(skb, mac_off, &veth, ETH_HLEN))
+ if (!nft_payload_rebuild_vlan_hdr(skb, mac_off, &veth))
return false;
- veth.h_vlan_proto = skb->vlan_proto;
- veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb));
- veth.h_vlan_encapsulated_proto = skb->protocol;
-
if (offset + len > VLAN_ETH_HLEN)
ethlen -= offset + len - VLAN_ETH_HLEN;
--
2.11.0
