diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/usbip/usbip_common.c | 852 |
1 files changed, 852 insertions, 0 deletions
diff --git a/drivers/usb/usbip/usbip_common.c b/drivers/usb/usbip/usbip_common.c new file mode 100644 index 000000000..f8b326eed --- /dev/null +++ b/drivers/usb/usbip/usbip_common.c @@ -0,0 +1,852 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2003-2008 Takahiro Hirofuchi + * Copyright (C) 2015-2016 Samsung Electronics + * Krzysztof Opasiak <k.opasiak@samsung.com> + */ + +#include <asm/byteorder.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <net/sock.h> + +#include "usbip_common.h" + +#define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>" +#define DRIVER_DESC "USB/IP Core" + +#ifdef CONFIG_USBIP_DEBUG +unsigned long usbip_debug_flag = 0xffffffff; +#else +unsigned long usbip_debug_flag; +#endif +EXPORT_SYMBOL_GPL(usbip_debug_flag); +module_param(usbip_debug_flag, ulong, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(usbip_debug_flag, "debug flags (defined in usbip_common.h)"); + +/* FIXME */ +struct device_attribute dev_attr_usbip_debug; +EXPORT_SYMBOL_GPL(dev_attr_usbip_debug); + +static ssize_t usbip_debug_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%lx\n", usbip_debug_flag); +} + +static ssize_t usbip_debug_store(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + if (sscanf(buf, "%lx", &usbip_debug_flag) != 1) + return -EINVAL; + return count; +} +DEVICE_ATTR_RW(usbip_debug); + +static void usbip_dump_buffer(char *buff, int bufflen) +{ + print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4, + buff, bufflen, false); +} + +static void usbip_dump_pipe(unsigned int p) +{ + unsigned char type = usb_pipetype(p); + unsigned char ep = usb_pipeendpoint(p); + unsigned char dev = usb_pipedevice(p); + unsigned char dir = usb_pipein(p); + + pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT"); + + switch (type) { + case PIPE_ISOCHRONOUS: + pr_debug("ISO\n"); + break; + case PIPE_INTERRUPT: + pr_debug("INT\n"); + break; + case PIPE_CONTROL: + pr_debug("CTRL\n"); + break; + case PIPE_BULK: + pr_debug("BULK\n"); + break; + default: + pr_debug("ERR\n"); + break; + } +} + +static void usbip_dump_usb_device(struct usb_device *udev) +{ + struct device *dev = &udev->dev; + int i; + + dev_dbg(dev, " devnum(%d) devpath(%s) usb speed(%s)", + udev->devnum, udev->devpath, usb_speed_string(udev->speed)); + + pr_debug("tt hub ttport %d\n", udev->ttport); + + dev_dbg(dev, " "); + for (i = 0; i < 16; i++) + pr_debug(" %2u", i); + pr_debug("\n"); + + dev_dbg(dev, " toggle0(IN) :"); + for (i = 0; i < 16; i++) + pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0); + pr_debug("\n"); + + dev_dbg(dev, " toggle1(OUT):"); + for (i = 0; i < 16; i++) + pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0); + pr_debug("\n"); + + dev_dbg(dev, " epmaxp_in :"); + for (i = 0; i < 16; i++) { + if (udev->ep_in[i]) + pr_debug(" %2u", + le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize)); + } + pr_debug("\n"); + + dev_dbg(dev, " epmaxp_out :"); + for (i = 0; i < 16; i++) { + if (udev->ep_out[i]) + pr_debug(" %2u", + le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize)); + } + pr_debug("\n"); + + dev_dbg(dev, "parent %s, bus %s\n", dev_name(&udev->parent->dev), + udev->bus->bus_name); + + dev_dbg(dev, "have_langid %d, string_langid %d\n", + udev->have_langid, udev->string_langid); + + dev_dbg(dev, "maxchild %d\n", udev->maxchild); +} + +static void usbip_dump_request_type(__u8 rt) +{ + switch (rt & USB_RECIP_MASK) { + case USB_RECIP_DEVICE: + pr_debug("DEVICE"); + break; + case USB_RECIP_INTERFACE: + pr_debug("INTERF"); + break; + case USB_RECIP_ENDPOINT: + pr_debug("ENDPOI"); + break; + case USB_RECIP_OTHER: + pr_debug("OTHER "); + break; + default: + pr_debug("------"); + break; + } +} + +static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd) +{ + if (!cmd) { + pr_debug(" : null pointer\n"); + return; + } + + pr_debug(" "); + pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) wLength(%04X) ", + cmd->bRequestType, cmd->bRequest, + cmd->wValue, cmd->wIndex, cmd->wLength); + pr_debug("\n "); + + if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) { + pr_debug("STANDARD "); + switch (cmd->bRequest) { + case USB_REQ_GET_STATUS: + pr_debug("GET_STATUS\n"); + break; + case USB_REQ_CLEAR_FEATURE: + pr_debug("CLEAR_FEAT\n"); + break; + case USB_REQ_SET_FEATURE: + pr_debug("SET_FEAT\n"); + break; + case USB_REQ_SET_ADDRESS: + pr_debug("SET_ADDRRS\n"); + break; + case USB_REQ_GET_DESCRIPTOR: + pr_debug("GET_DESCRI\n"); + break; + case USB_REQ_SET_DESCRIPTOR: + pr_debug("SET_DESCRI\n"); + break; + case USB_REQ_GET_CONFIGURATION: + pr_debug("GET_CONFIG\n"); + break; + case USB_REQ_SET_CONFIGURATION: + pr_debug("SET_CONFIG\n"); + break; + case USB_REQ_GET_INTERFACE: + pr_debug("GET_INTERF\n"); + break; + case USB_REQ_SET_INTERFACE: + pr_debug("SET_INTERF\n"); + break; + case USB_REQ_SYNCH_FRAME: + pr_debug("SYNC_FRAME\n"); + break; + default: + pr_debug("REQ(%02X)\n", cmd->bRequest); + break; + } + usbip_dump_request_type(cmd->bRequestType); + } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) { + pr_debug("CLASS\n"); + } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) { + pr_debug("VENDOR\n"); + } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) { + pr_debug("RESERVED\n"); + } +} + +void usbip_dump_urb(struct urb *urb) +{ + struct device *dev; + + if (!urb) { + pr_debug("urb: null pointer!!\n"); + return; + } + + if (!urb->dev) { + pr_debug("urb->dev: null pointer!!\n"); + return; + } + + dev = &urb->dev->dev; + + usbip_dump_usb_device(urb->dev); + + dev_dbg(dev, " pipe :%08x ", urb->pipe); + + usbip_dump_pipe(urb->pipe); + + dev_dbg(dev, " status :%d\n", urb->status); + dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags); + dev_dbg(dev, " transfer_buffer_length:%d\n", + urb->transfer_buffer_length); + dev_dbg(dev, " actual_length :%d\n", urb->actual_length); + + if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL) + usbip_dump_usb_ctrlrequest( + (struct usb_ctrlrequest *)urb->setup_packet); + + dev_dbg(dev, " start_frame :%d\n", urb->start_frame); + dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets); + dev_dbg(dev, " interval :%d\n", urb->interval); + dev_dbg(dev, " error_count :%d\n", urb->error_count); +} +EXPORT_SYMBOL_GPL(usbip_dump_urb); + +void usbip_dump_header(struct usbip_header *pdu) +{ + pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n", + pdu->base.command, + pdu->base.seqnum, + pdu->base.devid, + pdu->base.direction, + pdu->base.ep); + + switch (pdu->base.command) { + case USBIP_CMD_SUBMIT: + pr_debug("USBIP_CMD_SUBMIT: x_flags %u x_len %u sf %u #p %d iv %d\n", + pdu->u.cmd_submit.transfer_flags, + pdu->u.cmd_submit.transfer_buffer_length, + pdu->u.cmd_submit.start_frame, + pdu->u.cmd_submit.number_of_packets, + pdu->u.cmd_submit.interval); + break; + case USBIP_CMD_UNLINK: + pr_debug("USBIP_CMD_UNLINK: seq %u\n", + pdu->u.cmd_unlink.seqnum); + break; + case USBIP_RET_SUBMIT: + pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n", + pdu->u.ret_submit.status, + pdu->u.ret_submit.actual_length, + pdu->u.ret_submit.start_frame, + pdu->u.ret_submit.number_of_packets, + pdu->u.ret_submit.error_count); + break; + case USBIP_RET_UNLINK: + pr_debug("USBIP_RET_UNLINK: status %d\n", + pdu->u.ret_unlink.status); + break; + default: + /* NOT REACHED */ + pr_err("unknown command\n"); + break; + } +} +EXPORT_SYMBOL_GPL(usbip_dump_header); + +/* Receive data over TCP/IP. */ +int usbip_recv(struct socket *sock, void *buf, int size) +{ + int result; + struct kvec iov = {.iov_base = buf, .iov_len = size}; + struct msghdr msg = {.msg_flags = MSG_NOSIGNAL}; + int total = 0; + + if (!sock || !buf || !size) + return -EINVAL; + + iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, size); + + usbip_dbg_xmit("enter\n"); + + do { + sock->sk->sk_allocation = GFP_NOIO; + + result = sock_recvmsg(sock, &msg, MSG_WAITALL); + if (result <= 0) + goto err; + + total += result; + } while (msg_data_left(&msg)); + + if (usbip_dbg_flag_xmit) { + pr_debug("receiving....\n"); + usbip_dump_buffer(buf, size); + pr_debug("received, osize %d ret %d size %zd total %d\n", + size, result, msg_data_left(&msg), total); + } + + return total; + +err: + return result; +} +EXPORT_SYMBOL_GPL(usbip_recv); + +/* there may be more cases to tweak the flags. */ +static unsigned int tweak_transfer_flags(unsigned int flags) +{ + flags &= ~URB_NO_TRANSFER_DMA_MAP; + return flags; +} + +/* + * USBIP driver packs URB transfer flags in PDUs that are exchanged + * between Server (usbip_host) and Client (vhci_hcd). URB_* flags + * are internal to kernel and could change. Where as USBIP URB flags + * exchanged in PDUs are USBIP user API must not change. + * + * USBIP_URB* flags are exported as explicit API and client and server + * do mapping from kernel flags to USBIP_URB*. Details as follows: + * + * Client tx path (USBIP_CMD_SUBMIT): + * - Maps URB_* to USBIP_URB_* when it sends USBIP_CMD_SUBMIT packet. + * + * Server rx path (USBIP_CMD_SUBMIT): + * - Maps USBIP_URB_* to URB_* when it receives USBIP_CMD_SUBMIT packet. + * + * Flags aren't included in USBIP_CMD_UNLINK and USBIP_RET_SUBMIT packets + * and no special handling is needed for them in the following cases: + * - Server rx path (USBIP_CMD_UNLINK) + * - Client rx path & Server tx path (USBIP_RET_SUBMIT) + * + * Code paths: + * usbip_pack_pdu() is the common routine that handles packing pdu from + * urb and unpack pdu to an urb. + * + * usbip_pack_cmd_submit() and usbip_pack_ret_submit() handle + * USBIP_CMD_SUBMIT and USBIP_RET_SUBMIT respectively. + * + * usbip_map_urb_to_usbip() and usbip_map_usbip_to_urb() are used + * by usbip_pack_cmd_submit() and usbip_pack_ret_submit() to map + * flags. + */ + +struct urb_to_usbip_flags { + u32 urb_flag; + u32 usbip_flag; +}; + +#define NUM_USBIP_FLAGS 17 + +static const struct urb_to_usbip_flags flag_map[NUM_USBIP_FLAGS] = { + {URB_SHORT_NOT_OK, USBIP_URB_SHORT_NOT_OK}, + {URB_ISO_ASAP, USBIP_URB_ISO_ASAP}, + {URB_NO_TRANSFER_DMA_MAP, USBIP_URB_NO_TRANSFER_DMA_MAP}, + {URB_ZERO_PACKET, USBIP_URB_ZERO_PACKET}, + {URB_NO_INTERRUPT, USBIP_URB_NO_INTERRUPT}, + {URB_FREE_BUFFER, USBIP_URB_FREE_BUFFER}, + {URB_DIR_IN, USBIP_URB_DIR_IN}, + {URB_DIR_OUT, USBIP_URB_DIR_OUT}, + {URB_DIR_MASK, USBIP_URB_DIR_MASK}, + {URB_DMA_MAP_SINGLE, USBIP_URB_DMA_MAP_SINGLE}, + {URB_DMA_MAP_PAGE, USBIP_URB_DMA_MAP_PAGE}, + {URB_DMA_MAP_SG, USBIP_URB_DMA_MAP_SG}, + {URB_MAP_LOCAL, USBIP_URB_MAP_LOCAL}, + {URB_SETUP_MAP_SINGLE, USBIP_URB_SETUP_MAP_SINGLE}, + {URB_SETUP_MAP_LOCAL, USBIP_URB_SETUP_MAP_LOCAL}, + {URB_DMA_SG_COMBINED, USBIP_URB_DMA_SG_COMBINED}, + {URB_ALIGNED_TEMP_BUFFER, USBIP_URB_ALIGNED_TEMP_BUFFER}, +}; + +static unsigned int urb_to_usbip(unsigned int flags) +{ + unsigned int map_flags = 0; + int loop; + + for (loop = 0; loop < NUM_USBIP_FLAGS; loop++) { + if (flags & flag_map[loop].urb_flag) + map_flags |= flag_map[loop].usbip_flag; + } + + return map_flags; +} + +static unsigned int usbip_to_urb(unsigned int flags) +{ + unsigned int map_flags = 0; + int loop; + + for (loop = 0; loop < NUM_USBIP_FLAGS; loop++) { + if (flags & flag_map[loop].usbip_flag) + map_flags |= flag_map[loop].urb_flag; + } + + return map_flags; +} + +static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb, + int pack) +{ + struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit; + + /* + * Some members are not still implemented in usbip. I hope this issue + * will be discussed when usbip is ported to other operating systems. + */ + if (pack) { + /* map after tweaking the urb flags */ + spdu->transfer_flags = urb_to_usbip(tweak_transfer_flags(urb->transfer_flags)); + spdu->transfer_buffer_length = urb->transfer_buffer_length; + spdu->start_frame = urb->start_frame; + spdu->number_of_packets = urb->number_of_packets; + spdu->interval = urb->interval; + } else { + urb->transfer_flags = usbip_to_urb(spdu->transfer_flags); + urb->transfer_buffer_length = spdu->transfer_buffer_length; + urb->start_frame = spdu->start_frame; + urb->number_of_packets = spdu->number_of_packets; + urb->interval = spdu->interval; + } +} + +static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb, + int pack) +{ + struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit; + + if (pack) { + rpdu->status = urb->status; + rpdu->actual_length = urb->actual_length; + rpdu->start_frame = urb->start_frame; + rpdu->number_of_packets = urb->number_of_packets; + rpdu->error_count = urb->error_count; + } else { + urb->status = rpdu->status; + urb->actual_length = rpdu->actual_length; + urb->start_frame = rpdu->start_frame; + urb->number_of_packets = rpdu->number_of_packets; + urb->error_count = rpdu->error_count; + } +} + +void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd, + int pack) +{ + switch (cmd) { + case USBIP_CMD_SUBMIT: + usbip_pack_cmd_submit(pdu, urb, pack); + break; + case USBIP_RET_SUBMIT: + usbip_pack_ret_submit(pdu, urb, pack); + break; + default: + /* NOT REACHED */ + pr_err("unknown command\n"); + break; + } +} +EXPORT_SYMBOL_GPL(usbip_pack_pdu); + +static void correct_endian_basic(struct usbip_header_basic *base, int send) +{ + if (send) { + base->command = cpu_to_be32(base->command); + base->seqnum = cpu_to_be32(base->seqnum); + base->devid = cpu_to_be32(base->devid); + base->direction = cpu_to_be32(base->direction); + base->ep = cpu_to_be32(base->ep); + } else { + base->command = be32_to_cpu(base->command); + base->seqnum = be32_to_cpu(base->seqnum); + base->devid = be32_to_cpu(base->devid); + base->direction = be32_to_cpu(base->direction); + base->ep = be32_to_cpu(base->ep); + } +} + +static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu, + int send) +{ + if (send) { + pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags); + + cpu_to_be32s(&pdu->transfer_buffer_length); + cpu_to_be32s(&pdu->start_frame); + cpu_to_be32s(&pdu->number_of_packets); + cpu_to_be32s(&pdu->interval); + } else { + pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags); + + be32_to_cpus(&pdu->transfer_buffer_length); + be32_to_cpus(&pdu->start_frame); + be32_to_cpus(&pdu->number_of_packets); + be32_to_cpus(&pdu->interval); + } +} + +static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu, + int send) +{ + if (send) { + cpu_to_be32s(&pdu->status); + cpu_to_be32s(&pdu->actual_length); + cpu_to_be32s(&pdu->start_frame); + cpu_to_be32s(&pdu->number_of_packets); + cpu_to_be32s(&pdu->error_count); + } else { + be32_to_cpus(&pdu->status); + be32_to_cpus(&pdu->actual_length); + be32_to_cpus(&pdu->start_frame); + be32_to_cpus(&pdu->number_of_packets); + be32_to_cpus(&pdu->error_count); + } +} + +static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu, + int send) +{ + if (send) + pdu->seqnum = cpu_to_be32(pdu->seqnum); + else + pdu->seqnum = be32_to_cpu(pdu->seqnum); +} + +static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu, + int send) +{ + if (send) + cpu_to_be32s(&pdu->status); + else + be32_to_cpus(&pdu->status); +} + +void usbip_header_correct_endian(struct usbip_header *pdu, int send) +{ + __u32 cmd = 0; + + if (send) + cmd = pdu->base.command; + + correct_endian_basic(&pdu->base, send); + + if (!send) + cmd = pdu->base.command; + + switch (cmd) { + case USBIP_CMD_SUBMIT: + correct_endian_cmd_submit(&pdu->u.cmd_submit, send); + break; + case USBIP_RET_SUBMIT: + correct_endian_ret_submit(&pdu->u.ret_submit, send); + break; + case USBIP_CMD_UNLINK: + correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send); + break; + case USBIP_RET_UNLINK: + correct_endian_ret_unlink(&pdu->u.ret_unlink, send); + break; + default: + /* NOT REACHED */ + pr_err("unknown command\n"); + break; + } +} +EXPORT_SYMBOL_GPL(usbip_header_correct_endian); + +static void usbip_iso_packet_correct_endian( + struct usbip_iso_packet_descriptor *iso, int send) +{ + /* does not need all members. but copy all simply. */ + if (send) { + iso->offset = cpu_to_be32(iso->offset); + iso->length = cpu_to_be32(iso->length); + iso->status = cpu_to_be32(iso->status); + iso->actual_length = cpu_to_be32(iso->actual_length); + } else { + iso->offset = be32_to_cpu(iso->offset); + iso->length = be32_to_cpu(iso->length); + iso->status = be32_to_cpu(iso->status); + iso->actual_length = be32_to_cpu(iso->actual_length); + } +} + +static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso, + struct usb_iso_packet_descriptor *uiso, int pack) +{ + if (pack) { + iso->offset = uiso->offset; + iso->length = uiso->length; + iso->status = uiso->status; + iso->actual_length = uiso->actual_length; + } else { + uiso->offset = iso->offset; + uiso->length = iso->length; + uiso->status = iso->status; + uiso->actual_length = iso->actual_length; + } +} + +/* must free buffer */ +struct usbip_iso_packet_descriptor* +usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen) +{ + struct usbip_iso_packet_descriptor *iso; + int np = urb->number_of_packets; + ssize_t size = np * sizeof(*iso); + int i; + + iso = kzalloc(size, GFP_KERNEL); + if (!iso) + return NULL; + + for (i = 0; i < np; i++) { + usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 1); + usbip_iso_packet_correct_endian(&iso[i], 1); + } + + *bufflen = size; + + return iso; +} +EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu); + +/* some members of urb must be substituted before. */ +int usbip_recv_iso(struct usbip_device *ud, struct urb *urb) +{ + void *buff; + struct usbip_iso_packet_descriptor *iso; + int np = urb->number_of_packets; + int size = np * sizeof(*iso); + int i; + int ret; + int total_length = 0; + + if (!usb_pipeisoc(urb->pipe)) + return 0; + + /* my Bluetooth dongle gets ISO URBs which are np = 0 */ + if (np == 0) + return 0; + + buff = kzalloc(size, GFP_KERNEL); + if (!buff) + return -ENOMEM; + + ret = usbip_recv(ud->tcp_socket, buff, size); + if (ret != size) { + dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n", + ret); + kfree(buff); + + if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) + usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); + else + usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); + + return -EPIPE; + } + + iso = (struct usbip_iso_packet_descriptor *) buff; + for (i = 0; i < np; i++) { + usbip_iso_packet_correct_endian(&iso[i], 0); + usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 0); + total_length += urb->iso_frame_desc[i].actual_length; + } + + kfree(buff); + + if (total_length != urb->actual_length) { + dev_err(&urb->dev->dev, + "total length of iso packets %d not equal to actual length of buffer %d\n", + total_length, urb->actual_length); + + if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) + usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); + else + usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); + + return -EPIPE; + } + + return ret; +} +EXPORT_SYMBOL_GPL(usbip_recv_iso); + +/* + * This functions restores the padding which was removed for optimizing + * the bandwidth during transfer over tcp/ip + * + * buffer and iso packets need to be stored and be in propeper endian in urb + * before calling this function + */ +void usbip_pad_iso(struct usbip_device *ud, struct urb *urb) +{ + int np = urb->number_of_packets; + int i; + int actualoffset = urb->actual_length; + + if (!usb_pipeisoc(urb->pipe)) + return; + + /* if no packets or length of data is 0, then nothing to unpack */ + if (np == 0 || urb->actual_length == 0) + return; + + /* + * if actual_length is transfer_buffer_length then no padding is + * present. + */ + if (urb->actual_length == urb->transfer_buffer_length) + return; + + /* + * loop over all packets from last to first (to prevent overwriting + * memory when padding) and move them into the proper place + */ + for (i = np-1; i > 0; i--) { + actualoffset -= urb->iso_frame_desc[i].actual_length; + memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset, + urb->transfer_buffer + actualoffset, + urb->iso_frame_desc[i].actual_length); + } +} +EXPORT_SYMBOL_GPL(usbip_pad_iso); + +/* some members of urb must be substituted before. */ +int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb) +{ + struct scatterlist *sg; + int ret = 0; + int recv; + int size; + int copy; + int i; + + if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) { + /* the direction of urb must be OUT. */ + if (usb_pipein(urb->pipe)) + return 0; + + size = urb->transfer_buffer_length; + } else { + /* the direction of urb must be IN. */ + if (usb_pipeout(urb->pipe)) + return 0; + + size = urb->actual_length; + } + + /* no need to recv xbuff */ + if (!(size > 0)) + return 0; + + if (size > urb->transfer_buffer_length) + /* should not happen, probably malicious packet */ + goto error; + + if (urb->num_sgs) { + copy = size; + for_each_sg(urb->sg, sg, urb->num_sgs, i) { + int recv_size; + + if (copy < sg->length) + recv_size = copy; + else + recv_size = sg->length; + + recv = usbip_recv(ud->tcp_socket, sg_virt(sg), + recv_size); + + if (recv != recv_size) + goto error; + + copy -= recv; + ret += recv; + + if (!copy) + break; + } + + if (ret != size) + goto error; + } else { + ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size); + if (ret != size) + goto error; + } + + return ret; + +error: + dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret); + if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) + usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); + else + usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); + + return -EPIPE; +} +EXPORT_SYMBOL_GPL(usbip_recv_xbuff); + +static int __init usbip_core_init(void) +{ + return usbip_init_eh(); +} + +static void __exit usbip_core_exit(void) +{ + usbip_finish_eh(); + return; +} + +module_init(usbip_core_init); +module_exit(usbip_core_exit); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); |