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>
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);
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;
}
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);
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);
}