drivers/net/wan/hdlc: Set skb->protocol before transmitting

[ Upstream commit 9fb030a70431a2a2a1b292dbf0b2f399cc072c16 ]

This patch sets skb->protocol before transmitting frames on the HDLC
device, so that a user listening on the HDLC device with an AF_PACKET
socket will see outgoing frames' sll_protocol field correctly set and
consistent with that of incoming frames.

1. Control frames in hdlc_cisco and hdlc_ppp

When these drivers send control frames, skb->protocol is not set.

This value should be set to htons(ETH_P_HDLC), because when receiving
control frames, their skb->protocol is set to htons(ETH_P_HDLC).

When receiving, hdlc_type_trans in hdlc.h is called, which then calls
cisco_type_trans or ppp_type_trans. The skb->protocol of control frames
is set to htons(ETH_P_HDLC) so that the control frames can be received
by hdlc_rcv in hdlc.c, which calls cisco_rx or ppp_rx to process the
control frames.

2. hdlc_fr

When this driver sends control frames, skb->protocol is set to internal
values used in this driver.

When this driver sends data frames (from upper stacked PVC devices),
skb->protocol is the same as that of the user data packet being sent on
the upper PVC device (for normal PVC devices), or is htons(ETH_P_802_3)
(for Ethernet-emulating PVC devices).

However, skb->protocol for both control frames and data frames should be
set to htons(ETH_P_HDLC), because when receiving, all frames received on
the HDLC device will have their skb->protocol set to htons(ETH_P_HDLC).

When receiving, hdlc_type_trans in hdlc.h is called, and because this
driver doesn't provide a type_trans function in struct hdlc_proto,
all frames will have their skb->protocol set to htons(ETH_P_HDLC).
The frames are then received by hdlc_rcv in hdlc.c, which calls fr_rx
to process the frames (control frames are consumed and data frames
are re-received on upper PVC devices).

Cc: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wan/hdlc_cisco.c b/drivers/net/wan/hdlc_cisco.c
index 444130655d8ea845ee7395a344f0a57c98aabddf..cb5898f7d68c9849e1c04839dede6186cacf32a5 100644 (file)
--- a/drivers/net/wan/hdlc_cisco.c
+++ b/drivers/net/wan/hdlc_cisco.c
@@ -118,6 +118,7 @@ static void cisco_keepalive_send(struct net_device *dev, u32 type,
        skb_put(skb, sizeof(struct cisco_packet));
        skb->priority = TC_PRIO_CONTROL;
        skb->dev = dev;
+       skb->protocol = htons(ETH_P_HDLC);
        skb_reset_network_header(skb);
 
        dev_queue_xmit(skb);

diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c
index 12b35404cd8e734e11338cdc437a0650756296ef..d6cfd51613ed8d9132c51e307f9f6ef589deb974 100644 (file)
--- a/drivers/net/wan/hdlc_fr.c
+++ b/drivers/net/wan/hdlc_fr.c
@@ -433,6 +433,8 @@ static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
                        if (pvc->state.fecn) /* TX Congestion counter */
                                dev->stats.tx_compressed++;
                        skb->dev = pvc->frad;
+                       skb->protocol = htons(ETH_P_HDLC);
+                       skb_reset_network_header(skb);
                        dev_queue_xmit(skb);
                        return NETDEV_TX_OK;
                }
@@ -555,6 +557,7 @@ static void fr_lmi_send(struct net_device *dev, int fullrep)
        skb_put(skb, i);
        skb->priority = TC_PRIO_CONTROL;
        skb->dev = dev;
+       skb->protocol = htons(ETH_P_HDLC);
        skb_reset_network_header(skb);
 
        dev_queue_xmit(skb);

diff --git a/drivers/net/wan/hdlc_ppp.c b/drivers/net/wan/hdlc_ppp.c
index 16f33d1ffbfb973b5c8a33851c7dfe057dc29a02..64f855651336963eaa2401669f7c422d9e376ffd 100644 (file)
--- a/drivers/net/wan/hdlc_ppp.c
+++ b/drivers/net/wan/hdlc_ppp.c
@@ -251,6 +251,7 @@ static void ppp_tx_cp(struct net_device *dev, u16 pid, u8 code,
 
        skb->priority = TC_PRIO_CONTROL;
        skb->dev = dev;
+       skb->protocol = htons(ETH_P_HDLC);
        skb_reset_network_header(skb);
        skb_queue_tail(&tx_queue, skb);
 }