From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- drivers/net/usb/ipheth.c | 704 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 704 insertions(+) create mode 100644 drivers/net/usb/ipheth.c (limited to 'drivers/net/usb/ipheth.c') diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c new file mode 100644 index 000000000..2b490114d --- /dev/null +++ b/drivers/net/usb/ipheth.c @@ -0,0 +1,704 @@ +/* + * ipheth.c - Apple iPhone USB Ethernet driver + * + * Copyright (c) 2009 Diego Giagio + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of GIAGIO.COM nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * Alternatively, provided that this notice is retained in full, this + * software may be distributed under the terms of the GNU General + * Public License ("GPL") version 2, in which case the provisions of the + * GPL apply INSTEAD OF those given above. + * + * The provided data structures and external interfaces from this code + * are not restricted to be used by modules with a GPL compatible license. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * + * Attention: iPhone device must be paired, otherwise it won't respond to our + * driver. For more info: http://giagio.com/wiki/moin.cgi/iPhoneEthernetDriver + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define USB_VENDOR_APPLE 0x05ac + +#define IPHETH_USBINTF_CLASS 255 +#define IPHETH_USBINTF_SUBCLASS 253 +#define IPHETH_USBINTF_PROTO 1 + +#define IPHETH_IP_ALIGN 2 /* padding at front of URB */ +/* On iOS devices, NCM headers in RX have a fixed size regardless of DPE count: + * - NTH16 (NCMH): 12 bytes, as per CDC NCM 1.0 spec + * - NDP16 (NCM0): 96 bytes, of which + * - NDP16 fixed header: 8 bytes + * - maximum of 22 DPEs (21 datagrams + trailer), 4 bytes each + */ +#define IPHETH_NDP16_MAX_DPE 22 +#define IPHETH_NDP16_HEADER_SIZE (sizeof(struct usb_cdc_ncm_ndp16) + \ + IPHETH_NDP16_MAX_DPE * \ + sizeof(struct usb_cdc_ncm_dpe16)) +#define IPHETH_NCM_HEADER_SIZE (sizeof(struct usb_cdc_ncm_nth16) + \ + IPHETH_NDP16_HEADER_SIZE) +#define IPHETH_TX_BUF_SIZE ETH_FRAME_LEN +#define IPHETH_RX_BUF_SIZE_LEGACY (IPHETH_IP_ALIGN + ETH_FRAME_LEN) +#define IPHETH_RX_BUF_SIZE_NCM 65536 + +#define IPHETH_TX_TIMEOUT (5 * HZ) + +#define IPHETH_INTFNUM 2 +#define IPHETH_ALT_INTFNUM 1 + +#define IPHETH_CTRL_ENDP 0x00 +#define IPHETH_CTRL_BUF_SIZE 0x40 +#define IPHETH_CTRL_TIMEOUT (5 * HZ) + +#define IPHETH_CMD_GET_MACADDR 0x00 +#define IPHETH_CMD_ENABLE_NCM 0x04 +#define IPHETH_CMD_CARRIER_CHECK 0x45 + +#define IPHETH_CARRIER_CHECK_TIMEOUT round_jiffies_relative(1 * HZ) +#define IPHETH_CARRIER_ON 0x04 + +static const struct usb_device_id ipheth_table[] = { + { USB_VENDOR_AND_INTERFACE_INFO(USB_VENDOR_APPLE, IPHETH_USBINTF_CLASS, + IPHETH_USBINTF_SUBCLASS, + IPHETH_USBINTF_PROTO) }, + { } +}; +MODULE_DEVICE_TABLE(usb, ipheth_table); + +struct ipheth_device { + struct usb_device *udev; + struct usb_interface *intf; + struct net_device *net; + struct urb *tx_urb; + struct urb *rx_urb; + unsigned char *tx_buf; + unsigned char *rx_buf; + unsigned char *ctrl_buf; + u8 bulk_in; + u8 bulk_out; + struct delayed_work carrier_work; + bool confirmed_pairing; + int (*rcvbulk_callback)(struct urb *urb); + size_t rx_buf_len; +}; + +static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags); + +static int ipheth_alloc_urbs(struct ipheth_device *iphone) +{ + struct urb *tx_urb = NULL; + struct urb *rx_urb = NULL; + u8 *tx_buf = NULL; + u8 *rx_buf = NULL; + + tx_urb = usb_alloc_urb(0, GFP_KERNEL); + if (tx_urb == NULL) + goto error_nomem; + + rx_urb = usb_alloc_urb(0, GFP_KERNEL); + if (rx_urb == NULL) + goto free_tx_urb; + + tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, + GFP_KERNEL, &tx_urb->transfer_dma); + if (tx_buf == NULL) + goto free_rx_urb; + + rx_buf = usb_alloc_coherent(iphone->udev, iphone->rx_buf_len, + GFP_KERNEL, &rx_urb->transfer_dma); + if (rx_buf == NULL) + goto free_tx_buf; + + + iphone->tx_urb = tx_urb; + iphone->rx_urb = rx_urb; + iphone->tx_buf = tx_buf; + iphone->rx_buf = rx_buf; + return 0; + +free_tx_buf: + usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, tx_buf, + tx_urb->transfer_dma); +free_rx_urb: + usb_free_urb(rx_urb); +free_tx_urb: + usb_free_urb(tx_urb); +error_nomem: + return -ENOMEM; +} + +static void ipheth_free_urbs(struct ipheth_device *iphone) +{ + usb_free_coherent(iphone->udev, iphone->rx_buf_len, iphone->rx_buf, + iphone->rx_urb->transfer_dma); + usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, iphone->tx_buf, + iphone->tx_urb->transfer_dma); + usb_free_urb(iphone->rx_urb); + usb_free_urb(iphone->tx_urb); +} + +static void ipheth_kill_urbs(struct ipheth_device *dev) +{ + usb_kill_urb(dev->tx_urb); + usb_kill_urb(dev->rx_urb); +} + +static int ipheth_consume_skb(char *buf, int len, struct ipheth_device *dev) +{ + struct sk_buff *skb; + + skb = dev_alloc_skb(len); + if (!skb) { + dev->net->stats.rx_dropped++; + return -ENOMEM; + } + + skb_put_data(skb, buf, len); + skb->dev = dev->net; + skb->protocol = eth_type_trans(skb, dev->net); + + dev->net->stats.rx_packets++; + dev->net->stats.rx_bytes += len; + netif_rx(skb); + + return 0; +} + +static int ipheth_rcvbulk_callback_legacy(struct urb *urb) +{ + struct ipheth_device *dev; + char *buf; + int len; + + dev = urb->context; + + if (urb->actual_length <= IPHETH_IP_ALIGN) { + dev->net->stats.rx_length_errors++; + return -EINVAL; + } + len = urb->actual_length - IPHETH_IP_ALIGN; + buf = urb->transfer_buffer + IPHETH_IP_ALIGN; + + return ipheth_consume_skb(buf, len, dev); +} + +/* In "NCM mode", the iOS device encapsulates RX (phone->computer) traffic + * in NCM Transfer Blocks (similarly to CDC NCM). However, unlike reverse + * tethering (handled by the `cdc_ncm` driver), regular tethering is not + * compliant with the CDC NCM spec, as the device is missing the necessary + * descriptors, and TX (computer->phone) traffic is not encapsulated + * at all. Thus `ipheth` implements a very limited subset of the spec with + * the sole purpose of parsing RX URBs. + */ +static int ipheth_rcvbulk_callback_ncm(struct urb *urb) +{ + struct usb_cdc_ncm_nth16 *ncmh; + struct usb_cdc_ncm_ndp16 *ncm0; + struct usb_cdc_ncm_dpe16 *dpe; + struct ipheth_device *dev; + u16 dg_idx, dg_len; + int retval = -EINVAL; + char *buf; + + dev = urb->context; + + if (urb->actual_length < IPHETH_NCM_HEADER_SIZE) { + dev->net->stats.rx_length_errors++; + return retval; + } + + ncmh = urb->transfer_buffer; + if (ncmh->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN) || + /* On iOS, NDP16 directly follows NTH16 */ + ncmh->wNdpIndex != cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16))) + goto rx_error; + + ncm0 = urb->transfer_buffer + sizeof(struct usb_cdc_ncm_nth16); + if (ncm0->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) + goto rx_error; + + dpe = ncm0->dpe16; + for (int dpe_i = 0; dpe_i < IPHETH_NDP16_MAX_DPE; ++dpe_i, ++dpe) { + dg_idx = le16_to_cpu(dpe->wDatagramIndex); + dg_len = le16_to_cpu(dpe->wDatagramLength); + + /* Null DPE must be present after last datagram pointer entry + * (3.3.1 USB CDC NCM spec v1.0) + */ + if (dg_idx == 0 && dg_len == 0) + return 0; + + if (dg_idx < IPHETH_NCM_HEADER_SIZE || + dg_idx >= urb->actual_length || + dg_len > urb->actual_length - dg_idx) { + dev->net->stats.rx_length_errors++; + return retval; + } + + buf = urb->transfer_buffer + dg_idx; + + retval = ipheth_consume_skb(buf, dg_len, dev); + if (retval != 0) + return retval; + } + +rx_error: + dev->net->stats.rx_errors++; + return retval; +} + +static void ipheth_rcvbulk_callback(struct urb *urb) +{ + struct ipheth_device *dev; + int retval, status; + + dev = urb->context; + if (dev == NULL) + return; + + status = urb->status; + switch (status) { + case -ENOENT: + case -ECONNRESET: + case -ESHUTDOWN: + case -EPROTO: + return; + case 0: + break; + default: + dev_err(&dev->intf->dev, "%s: urb status: %d\n", + __func__, status); + return; + } + + /* iPhone may periodically send URBs with no payload + * on the "bulk in" endpoint. It is safe to ignore them. + */ + if (urb->actual_length == 0) + goto rx_submit; + + /* RX URBs starting with 0x00 0x01 do not encapsulate Ethernet frames, + * but rather are control frames. Their purpose is not documented, and + * they don't affect driver functionality, okay to drop them. + * There is usually just one 4-byte control frame as the very first + * URB received from the bulk IN endpoint. + */ + if (unlikely + (urb->actual_length == 4 && + ((char *)urb->transfer_buffer)[0] == 0 && + ((char *)urb->transfer_buffer)[1] == 1)) + goto rx_submit; + + retval = dev->rcvbulk_callback(urb); + if (retval != 0) { + dev_err(&dev->intf->dev, "%s: callback retval: %d\n", + __func__, retval); + } + +rx_submit: + dev->confirmed_pairing = true; + ipheth_rx_submit(dev, GFP_ATOMIC); +} + +static void ipheth_sndbulk_callback(struct urb *urb) +{ + struct ipheth_device *dev; + int status = urb->status; + + dev = urb->context; + if (dev == NULL) + return; + + if (status != 0 && + status != -ENOENT && + status != -ECONNRESET && + status != -ESHUTDOWN) + dev_err(&dev->intf->dev, "%s: urb status: %d\n", + __func__, status); + + if (status == 0) + netif_wake_queue(dev->net); + else + // on URB error, trigger immediate poll + schedule_delayed_work(&dev->carrier_work, 0); +} + +static int ipheth_carrier_set(struct ipheth_device *dev) +{ + struct usb_device *udev; + int retval; + + if (!dev->confirmed_pairing) + return 0; + + udev = dev->udev; + retval = usb_control_msg(udev, + usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP), + IPHETH_CMD_CARRIER_CHECK, /* request */ + 0xc0, /* request type */ + 0x00, /* value */ + 0x02, /* index */ + dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE, + IPHETH_CTRL_TIMEOUT); + if (retval <= 0) { + dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n", + __func__, retval); + return retval; + } + + if ((retval == 1 && dev->ctrl_buf[0] == IPHETH_CARRIER_ON) || + (retval >= 2 && dev->ctrl_buf[1] == IPHETH_CARRIER_ON)) { + netif_carrier_on(dev->net); + if (dev->tx_urb->status != -EINPROGRESS) + netif_wake_queue(dev->net); + } else { + netif_carrier_off(dev->net); + netif_stop_queue(dev->net); + } + return 0; +} + +static void ipheth_carrier_check_work(struct work_struct *work) +{ + struct ipheth_device *dev = container_of(work, struct ipheth_device, + carrier_work.work); + + ipheth_carrier_set(dev); + schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT); +} + +static int ipheth_get_macaddr(struct ipheth_device *dev) +{ + struct usb_device *udev = dev->udev; + struct net_device *net = dev->net; + int retval; + + retval = usb_control_msg(udev, + usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP), + IPHETH_CMD_GET_MACADDR, /* request */ + 0xc0, /* request type */ + 0x00, /* value */ + 0x02, /* index */ + dev->ctrl_buf, + IPHETH_CTRL_BUF_SIZE, + IPHETH_CTRL_TIMEOUT); + if (retval < 0) { + dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n", + __func__, retval); + } else if (retval < ETH_ALEN) { + dev_err(&dev->intf->dev, + "%s: usb_control_msg: short packet: %d bytes\n", + __func__, retval); + retval = -EINVAL; + } else { + eth_hw_addr_set(net, dev->ctrl_buf); + retval = 0; + } + + return retval; +} + +static int ipheth_enable_ncm(struct ipheth_device *dev) +{ + struct usb_device *udev = dev->udev; + int retval; + + retval = usb_control_msg(udev, + usb_sndctrlpipe(udev, IPHETH_CTRL_ENDP), + IPHETH_CMD_ENABLE_NCM, /* request */ + 0x41, /* request type */ + 0x00, /* value */ + 0x02, /* index */ + NULL, + 0, + IPHETH_CTRL_TIMEOUT); + + dev_info(&dev->intf->dev, "%s: usb_control_msg: %d\n", + __func__, retval); + + return retval; +} + +static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags) +{ + struct usb_device *udev = dev->udev; + int retval; + + usb_fill_bulk_urb(dev->rx_urb, udev, + usb_rcvbulkpipe(udev, dev->bulk_in), + dev->rx_buf, dev->rx_buf_len, + ipheth_rcvbulk_callback, + dev); + dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + + retval = usb_submit_urb(dev->rx_urb, mem_flags); + if (retval) + dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n", + __func__, retval); + return retval; +} + +static int ipheth_open(struct net_device *net) +{ + struct ipheth_device *dev = netdev_priv(net); + struct usb_device *udev = dev->udev; + int retval = 0; + + usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM); + + retval = ipheth_carrier_set(dev); + if (retval) + return retval; + + retval = ipheth_rx_submit(dev, GFP_KERNEL); + if (retval) + return retval; + + enable_delayed_work(&dev->carrier_work); + schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT); + return retval; +} + +static int ipheth_close(struct net_device *net) +{ + struct ipheth_device *dev = netdev_priv(net); + + netif_stop_queue(net); + /* A TX URB can still complete with an error after this point and + * try to re-arm the carrier work. Disable it instead of cancelling + * it, so that such a schedule_delayed_work() is a no-op. + */ + disable_delayed_work_sync(&dev->carrier_work); + return 0; +} + +static netdev_tx_t ipheth_tx(struct sk_buff *skb, struct net_device *net) +{ + struct ipheth_device *dev = netdev_priv(net); + struct usb_device *udev = dev->udev; + int retval; + + /* Paranoid */ + if (skb->len > IPHETH_TX_BUF_SIZE) { + WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len); + dev->net->stats.tx_dropped++; + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; + } + + memcpy(dev->tx_buf, skb->data, skb->len); + + usb_fill_bulk_urb(dev->tx_urb, udev, + usb_sndbulkpipe(udev, dev->bulk_out), + dev->tx_buf, skb->len, + ipheth_sndbulk_callback, + dev); + dev->tx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + + netif_stop_queue(net); + retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC); + if (retval) { + dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n", + __func__, retval); + dev->net->stats.tx_errors++; + dev_kfree_skb_any(skb); + netif_wake_queue(net); + } else { + dev->net->stats.tx_packets++; + dev->net->stats.tx_bytes += skb->len; + dev_consume_skb_any(skb); + } + + return NETDEV_TX_OK; +} + +static void ipheth_tx_timeout(struct net_device *net, unsigned int txqueue) +{ + struct ipheth_device *dev = netdev_priv(net); + + dev_err(&dev->intf->dev, "%s: TX timeout\n", __func__); + dev->net->stats.tx_errors++; + usb_unlink_urb(dev->tx_urb); +} + +static u32 ipheth_ethtool_op_get_link(struct net_device *net) +{ + struct ipheth_device *dev = netdev_priv(net); + return netif_carrier_ok(dev->net); +} + +static const struct ethtool_ops ops = { + .get_link = ipheth_ethtool_op_get_link +}; + +static const struct net_device_ops ipheth_netdev_ops = { + .ndo_open = ipheth_open, + .ndo_stop = ipheth_close, + .ndo_start_xmit = ipheth_tx, + .ndo_tx_timeout = ipheth_tx_timeout, +}; + +static int ipheth_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct usb_device *udev = interface_to_usbdev(intf); + struct usb_endpoint_descriptor *ep_in, *ep_out; + struct usb_host_interface *hintf; + struct ipheth_device *dev; + struct net_device *netdev; + int retval; + + netdev = alloc_etherdev(sizeof(struct ipheth_device)); + if (!netdev) + return -ENOMEM; + + netdev->netdev_ops = &ipheth_netdev_ops; + netdev->watchdog_timeo = IPHETH_TX_TIMEOUT; + strscpy(netdev->name, "eth%d", sizeof(netdev->name)); + + dev = netdev_priv(netdev); + dev->udev = udev; + dev->net = netdev; + dev->intf = intf; + dev->confirmed_pairing = false; + dev->rx_buf_len = IPHETH_RX_BUF_SIZE_LEGACY; + dev->rcvbulk_callback = ipheth_rcvbulk_callback_legacy; + /* Set up endpoints */ + hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM); + if (hintf == NULL) { + retval = -ENODEV; + dev_err(&intf->dev, "Unable to find alternate settings interface\n"); + goto err_endpoints; + } + + retval = usb_find_common_endpoints_reverse(hintf, &ep_in, &ep_out, + NULL, NULL); + if (retval) { + dev_err(&intf->dev, "Unable to find endpoints\n"); + goto err_endpoints; + } + + dev->bulk_in = ep_in->bEndpointAddress; + dev->bulk_out = ep_out->bEndpointAddress; + + dev->ctrl_buf = kmalloc(IPHETH_CTRL_BUF_SIZE, GFP_KERNEL); + if (dev->ctrl_buf == NULL) { + retval = -ENOMEM; + goto err_alloc_ctrl_buf; + } + + retval = ipheth_get_macaddr(dev); + if (retval) + goto err_get_macaddr; + + retval = ipheth_enable_ncm(dev); + if (!retval) { + dev->rx_buf_len = IPHETH_RX_BUF_SIZE_NCM; + dev->rcvbulk_callback = ipheth_rcvbulk_callback_ncm; + } + + INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work); + /* Armed only between ipheth_open() and ipheth_close(). Start out + * disabled so the enable/disable counts balance from the first open. + */ + disable_delayed_work(&dev->carrier_work); + + retval = ipheth_alloc_urbs(dev); + if (retval) { + dev_err(&intf->dev, "error allocating urbs: %d\n", retval); + goto err_alloc_urbs; + } + + usb_set_intfdata(intf, dev); + + SET_NETDEV_DEV(netdev, &intf->dev); + netdev->ethtool_ops = &ops; + + retval = register_netdev(netdev); + if (retval) { + dev_err(&intf->dev, "error registering netdev: %d\n", retval); + retval = -EIO; + goto err_register_netdev; + } + // carrier down and transmit queues stopped until packet from device + netif_carrier_off(netdev); + netif_tx_stop_all_queues(netdev); + dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n"); + return 0; + +err_register_netdev: + ipheth_free_urbs(dev); +err_alloc_urbs: +err_get_macaddr: + kfree(dev->ctrl_buf); +err_alloc_ctrl_buf: +err_endpoints: + free_netdev(netdev); + return retval; +} + +static void ipheth_disconnect(struct usb_interface *intf) +{ + struct ipheth_device *dev; + + dev = usb_get_intfdata(intf); + if (dev != NULL) { + unregister_netdev(dev->net); + ipheth_kill_urbs(dev); + ipheth_free_urbs(dev); + kfree(dev->ctrl_buf); + free_netdev(dev->net); + } + usb_set_intfdata(intf, NULL); + dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n"); +} + +static struct usb_driver ipheth_driver = { + .name = "ipheth", + .probe = ipheth_probe, + .disconnect = ipheth_disconnect, + .id_table = ipheth_table, + .disable_hub_initiated_lpm = 1, +}; + +module_usb_driver(ipheth_driver); + +MODULE_AUTHOR("Diego Giagio "); +MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver"); +MODULE_LICENSE("Dual BSD/GPL"); -- cgit v1.3.1