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+/*
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+ * Ethernet interface part of the LG VL600 LTE modem (4G dongle)
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+ *
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+ * Copyright (C) 2011 Intel Corporation
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+ * Author: Andrzej Zaborowski <balrogg@gmail.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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+#include <linux/etherdevice.h>
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+#include <linux/ethtool.h>
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+#include <linux/mii.h>
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+#include <linux/usb.h>
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+#include <linux/usb/cdc.h>
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+#include <linux/usb/usbnet.h>
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+#include <linux/if_ether.h>
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+#include <linux/if_arp.h>
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+#include <linux/inetdevice.h>
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+
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+/*
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+ * The device has a CDC ACM port for modem control (it claims to be
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+ * CDC ACM anyway) and a CDC Ethernet port for actual network data.
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+ * It will however ignore data on both ports that is not encapsulated
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+ * in a specific way, any data returned is also encapsulated the same
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+ * way. The headers don't seem to follow any popular standard.
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+ *
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+ * This driver adds and strips these headers from the ethernet frames
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+ * sent/received from the CDC Ethernet port. The proprietary header
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+ * replaces the standard ethernet header in a packet so only actual
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+ * ethernet frames are allowed. The headers allow some form of
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+ * multiplexing by using non standard values of the .h_proto field.
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+ * Windows/Mac drivers do send a couple of such frames to the device
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+ * during initialisation, with protocol set to 0x0906 or 0x0b06 and (what
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+ * seems to be) a flag in the .dummy_flags. This doesn't seem necessary
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+ * for modem operation but can possibly be used for GPS or other funcitons.
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+ */
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+
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+struct vl600_frame_hdr {
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+ __le32 len;
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+ __le32 serial;
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+ __le32 pkt_cnt;
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+ __le32 dummy_flags;
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+ __le32 dummy;
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+ __le32 magic;
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+} __attribute__((packed));
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+
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+struct vl600_pkt_hdr {
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+ __le32 dummy[2];
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+ __le32 len;
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+ __be16 h_proto;
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+} __attribute__((packed));
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+
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+struct vl600_state {
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+ struct sk_buff *current_rx_buf;
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+};
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+
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+static int vl600_bind(struct usbnet *dev, struct usb_interface *intf)
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+{
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+ int ret;
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+ struct vl600_state *s = kzalloc(sizeof(struct vl600_state), GFP_KERNEL);
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+
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+ if (!s)
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+ return -ENOMEM;
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+
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+ ret = usbnet_cdc_bind(dev, intf);
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+ if (ret) {
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+ kfree(s);
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+ return ret;
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+ }
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+
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+ dev->driver_priv = s;
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+
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+ /* ARP packets don't go through, but they're also of no use. The
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+ * subnet has only two hosts anyway: us and the gateway / DHCP
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+ * server (probably simulated by modem firmware or network operator)
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+ * whose address changes everytime we connect to the intarwebz and
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+ * who doesn't bother answering ARP requests either. So hardware
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+ * addresses have no meaning, the destination and the source of every
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+ * packet depend only on whether it is on the IN or OUT endpoint. */
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+ dev->net->flags |= IFF_NOARP;
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+
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+ return ret;
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+}
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+
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+static void vl600_unbind(struct usbnet *dev, struct usb_interface *intf)
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+{
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+ struct vl600_state *s = dev->driver_priv;
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+
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+ if (s->current_rx_buf)
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+ dev_kfree_skb(s->current_rx_buf);
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+
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+ kfree(s);
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+
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+ return usbnet_cdc_unbind(dev, intf);
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+}
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+
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+static int vl600_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
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+{
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+ struct vl600_frame_hdr *frame;
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+ struct vl600_pkt_hdr *packet;
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+ struct ethhdr *ethhdr;
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+ int packet_len, count;
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+ struct sk_buff *buf = skb;
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+ struct sk_buff *clone;
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+ struct vl600_state *s = dev->driver_priv;
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+
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+ /* Frame lengths are generally 4B multiplies but every couple of
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+ * hours there's an odd number of bytes sized yet correct frame,
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+ * so don't require this. */
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+
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+ /* Allow a packet (or multiple packets batched together) to be
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+ * split across many frames. We don't allow a new batch to
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+ * begin in the same frame another one is ending however, and no
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+ * leading or trailing pad bytes. */
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+ if (s->current_rx_buf) {
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+ frame = (struct vl600_frame_hdr *) s->current_rx_buf->data;
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+ if (skb->len + s->current_rx_buf->len >
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+ le32_to_cpup(&frame->len)) {
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+ netif_err(dev, ifup, dev->net, "Fragment too long\n");
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+ dev->net->stats.rx_length_errors++;
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+ goto error;
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+ }
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+
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+ buf = s->current_rx_buf;
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+ memcpy(skb_put(buf, skb->len), skb->data, skb->len);
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+ } else if (skb->len < 4) {
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+ netif_err(dev, ifup, dev->net, "Frame too short\n");
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+ dev->net->stats.rx_length_errors++;
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+ goto error;
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+ }
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+
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+ frame = (struct vl600_frame_hdr *) buf->data;
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+ /* NOTE: Should check that frame->magic == 0x53544448?
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+ * Otherwise if we receive garbage at the beginning of the frame
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+ * we may end up allocating a huge buffer and saving all the
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+ * future incoming data into it. */
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+
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+ if (buf->len < sizeof(*frame) ||
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+ buf->len != le32_to_cpup(&frame->len)) {
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+ /* Save this fragment for later assembly */
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+ if (s->current_rx_buf)
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+ return 0;
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+
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+ s->current_rx_buf = skb_copy_expand(skb, 0,
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+ le32_to_cpup(&frame->len), GFP_ATOMIC);
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+ if (!s->current_rx_buf) {
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+ netif_err(dev, ifup, dev->net, "Reserving %i bytes "
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+ "for packet assembly failed.\n",
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+ le32_to_cpup(&frame->len));
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+ dev->net->stats.rx_errors++;
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+ }
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+
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+ return 0;
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+ }
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+
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+ count = le32_to_cpup(&frame->pkt_cnt);
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+
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+ skb_pull(buf, sizeof(*frame));
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+
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+ while (count--) {
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+ if (buf->len < sizeof(*packet)) {
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+ netif_err(dev, ifup, dev->net, "Packet too short\n");
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+ goto error;
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+ }
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+
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+ packet = (struct vl600_pkt_hdr *) buf->data;
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+ packet_len = sizeof(*packet) + le32_to_cpup(&packet->len);
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+ if (packet_len > buf->len) {
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+ netif_err(dev, ifup, dev->net,
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+ "Bad packet length stored in header\n");
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+ goto error;
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+ }
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+
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+ /* Packet header is same size as the ethernet header
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+ * (sizeof(*packet) == sizeof(*ethhdr)), additionally
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+ * the h_proto field is in the same place so we just leave it
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+ * alone and fill in the remaining fields.
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+ */
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+ ethhdr = (struct ethhdr *) skb->data;
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+ if (be16_to_cpup(ðhdr->h_proto) == ETH_P_ARP &&
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+ buf->len > 0x26) {
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+ /* Copy the addresses from packet contents */
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+ memcpy(ethhdr->h_source,
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+ &buf->data[sizeof(*ethhdr) + 0x8],
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+ ETH_ALEN);
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+ memcpy(ethhdr->h_dest,
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+ &buf->data[sizeof(*ethhdr) + 0x12],
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+ ETH_ALEN);
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+ } else {
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+ memset(ethhdr->h_source, 0, ETH_ALEN);
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+ memcpy(ethhdr->h_dest, dev->net->dev_addr, ETH_ALEN);
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+ }
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+
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+ if (count) {
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+ /* Not the last packet in this batch */
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+ clone = skb_clone(buf, GFP_ATOMIC);
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+ if (!clone)
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+ goto error;
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+
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+ skb_trim(clone, packet_len);
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+ usbnet_skb_return(dev, clone);
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+
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+ skb_pull(buf, (packet_len + 3) & ~3);
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+ } else {
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+ skb_trim(buf, packet_len);
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+
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+ if (s->current_rx_buf) {
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+ usbnet_skb_return(dev, buf);
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+ s->current_rx_buf = NULL;
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+ return 0;
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+ }
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+
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+ return 1;
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+ }
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+ }
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+
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+error:
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+ if (s->current_rx_buf) {
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+ dev_kfree_skb_any(s->current_rx_buf);
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+ s->current_rx_buf = NULL;
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+ }
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+ dev->net->stats.rx_errors++;
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+ return 0;
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+}
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+
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+static struct sk_buff *vl600_tx_fixup(struct usbnet *dev,
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+ struct sk_buff *skb, gfp_t flags)
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+{
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+ struct sk_buff *ret;
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+ struct vl600_frame_hdr *frame;
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+ struct vl600_pkt_hdr *packet;
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+ static uint32_t serial = 1;
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+ int orig_len = skb->len - sizeof(struct ethhdr);
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+ int full_len = (skb->len + sizeof(struct vl600_frame_hdr) + 3) & ~3;
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+
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+ frame = (struct vl600_frame_hdr *) skb->data;
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+ if (skb->len > sizeof(*frame) && skb->len == le32_to_cpup(&frame->len))
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+ return skb; /* Already encapsulated? */
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+
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+ if (skb->len < sizeof(struct ethhdr))
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+ /* Drop, device can only deal with ethernet packets */
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+ return NULL;
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+
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+ if (!skb_cloned(skb)) {
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+ int headroom = skb_headroom(skb);
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+ int tailroom = skb_tailroom(skb);
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+
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+ if (tailroom >= full_len - skb->len - sizeof(*frame) &&
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+ headroom >= sizeof(*frame))
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+ /* There's enough head and tail room */
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+ goto encapsulate;
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+
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+ if (headroom + tailroom + skb->len >= full_len) {
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+ /* There's enough total room, just readjust */
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+ skb->data = memmove(skb->head + sizeof(*frame),
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+ skb->data, skb->len);
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+ skb_set_tail_pointer(skb, skb->len);
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+ goto encapsulate;
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+ }
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+ }
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+
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+ /* Alloc a new skb with the required size */
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+ ret = skb_copy_expand(skb, sizeof(struct vl600_frame_hdr), full_len -
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+ skb->len - sizeof(struct vl600_frame_hdr), flags);
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+ dev_kfree_skb_any(skb);
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+ if (!ret)
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+ return ret;
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+ skb = ret;
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+
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+encapsulate:
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+ /* Packet header is same size as ethernet packet header
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+ * (sizeof(*packet) == sizeof(struct ethhdr)), additionally the
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+ * h_proto field is in the same place so we just leave it alone and
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+ * overwrite the remaining fields.
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+ */
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+ packet = (struct vl600_pkt_hdr *) skb->data;
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+ memset(&packet->dummy, 0, sizeof(packet->dummy));
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+ packet->len = cpu_to_le32(orig_len);
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+
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+ frame = (struct vl600_frame_hdr *) skb_push(skb, sizeof(*frame));
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+ memset(frame, 0, sizeof(*frame));
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+ frame->len = cpu_to_le32(full_len);
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+ frame->serial = cpu_to_le32(serial++);
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+ frame->pkt_cnt = cpu_to_le32(1);
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+
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+ if (skb->len < full_len) /* Pad */
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+ skb_put(skb, full_len - skb->len);
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+
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+ return skb;
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+}
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+
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+static const struct driver_info vl600_info = {
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+ .description = "LG VL600 modem",
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+ .flags = FLAG_ETHER | FLAG_RX_ASSEMBLE,
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+ .bind = vl600_bind,
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+ .unbind = vl600_unbind,
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+ .status = usbnet_cdc_status,
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+ .rx_fixup = vl600_rx_fixup,
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+ .tx_fixup = vl600_tx_fixup,
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+};
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+
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+static const struct usb_device_id products[] = {
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+ {
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+ USB_DEVICE_AND_INTERFACE_INFO(0x1004, 0x61aa, USB_CLASS_COMM,
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+ USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
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+ .driver_info = (unsigned long) &vl600_info,
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+ },
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+ {}, /* End */
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+};
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+MODULE_DEVICE_TABLE(usb, products);
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+
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+static struct usb_driver lg_vl600_driver = {
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+ .name = "lg-vl600",
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+ .id_table = products,
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+ .probe = usbnet_probe,
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+ .disconnect = usbnet_disconnect,
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+ .suspend = usbnet_suspend,
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+ .resume = usbnet_resume,
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+};
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+
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+static int __init vl600_init(void)
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+{
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+ return usb_register(&lg_vl600_driver);
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+}
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+module_init(vl600_init);
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+
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+static void __exit vl600_exit(void)
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+{
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+ usb_deregister(&lg_vl600_driver);
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+}
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+module_exit(vl600_exit);
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+
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+MODULE_AUTHOR("Anrzej Zaborowski");
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+MODULE_DESCRIPTION("LG-VL600 modem's ethernet link");
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+MODULE_LICENSE("GPL");
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