When an application sends with AF_PACKET and places a vlan header on
the raw packet; then the AF_PACKET needs to move the tag into the skb
so that it gets processed normally through the rest of the transmit
path.
This is particularly a problem on Hyper-V where the host only allows
vlan in the offload info.
Cc: xe-linux-exter...@cisco.com
Cc: Sriram Krishnan <srira...@cisco.com>
Signed-off-by: Sriram Krishnan <srira...@cisco.com>
---
net/packet/af_packet.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 29bd405adbbd..10988639561e 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1857,15 +1857,35 @@ static int packet_rcv_spkt(struct sk_buff *skb, struct
net_device *dev,
return 0;
}
-static void packet_parse_headers(struct sk_buff *skb, struct socket *sock)
+static int packet_parse_headers(struct sk_buff *skb, struct socket *sock)
{
if ((!skb->protocol || skb->protocol == htons(ETH_P_ALL)) &&
sock->type == SOCK_RAW) {
+ __be16 ethertype;
+
skb_reset_mac_header(skb);
+
+ ethertype = eth_hdr(skb)->h_proto;
+ /*
+ * If Vlan tag is present in the packet
+ * move it to skb
+ */
+ if (eth_type_vlan(ethertype)) {
+ int err;
+ __be16 vlan_tci;
+
+ err = __skb_vlan_pop(skb, &vlan_tci);
+ if (unlikely(err))
+ return err;
+
+ __vlan_hwaccel_put_tag(skb, ethertype, vlan_tci);
+ }
+
skb->protocol = dev_parse_header_protocol(skb);
}
skb_probe_transport_header(skb);
+ return 0;
}
/*
@@ -1987,7 +2007,9 @@ static int packet_sendmsg_spkt(struct socket *sock,
struct msghdr *msg,
if (unlikely(extra_len == 4))
skb->no_fcs = 1;
- packet_parse_headers(skb, sock);
+ err = packet_parse_headers(skb, sock);
+ if (err)
+ goto out_unlock;
dev_queue_xmit(skb);
rcu_read_unlock();
--
2.24.0
