283 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (C) 2015-2016 Samsung Electronics4 * Igor Kotrasinski <i.kotrasinsk@samsung.com>5 * Krzysztof Opasiak <k.opasiak@samsung.com>6 *7 * Refactored from usbip_host_driver.c, which is:8 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>9 * 2005-2007 Takahiro Hirofuchi10 */11 12#include <sys/types.h>13#include <sys/stat.h>14#include <fcntl.h>15 16#include <errno.h>17#include <unistd.h>18 19#include <libudev.h>20 21#include "usbip_common.h"22#include "usbip_host_common.h"23#include "list.h"24#include "sysfs_utils.h"25 26extern struct udev *udev_context;27 28static int32_t read_attr_usbip_status(struct usbip_usb_device *udev)29{30 char status_attr_path[SYSFS_PATH_MAX];31 int size;32 int fd;33 int length;34 char status[2] = { 0 };35 int value = 0;36 37 size = snprintf(status_attr_path, sizeof(status_attr_path),38 "%s/usbip_status", udev->path);39 if (size < 0 || (unsigned int)size >= sizeof(status_attr_path)) {40 err("usbip_status path length %i >= %lu or < 0", size,41 (long unsigned)sizeof(status_attr_path));42 return -1;43 }44 45 46 fd = open(status_attr_path, O_RDONLY);47 if (fd < 0) {48 err("error opening attribute %s", status_attr_path);49 return -1;50 }51 52 length = read(fd, status, 1);53 if (length < 0) {54 err("error reading attribute %s", status_attr_path);55 close(fd);56 return -1;57 }58 59 value = atoi(status);60 close(fd);61 return value;62}63 64static65struct usbip_exported_device *usbip_exported_device_new(66 struct usbip_host_driver *hdriver, const char *sdevpath)67{68 struct usbip_exported_device *edev = NULL;69 struct usbip_exported_device *edev_old;70 size_t size;71 int i;72 73 edev = calloc(1, sizeof(struct usbip_exported_device));74 75 edev->sudev =76 udev_device_new_from_syspath(udev_context, sdevpath);77 if (!edev->sudev) {78 err("udev_device_new_from_syspath: %s", sdevpath);79 goto err;80 }81 82 if (hdriver->ops.read_device(edev->sudev, &edev->udev) < 0)83 goto err;84 85 edev->status = read_attr_usbip_status(&edev->udev);86 if (edev->status < 0)87 goto err;88 89 /* reallocate buffer to include usb interface data */90 size = sizeof(struct usbip_exported_device) +91 edev->udev.bNumInterfaces * sizeof(struct usbip_usb_interface);92 93 edev_old = edev;94 edev = realloc(edev, size);95 if (!edev) {96 edev = edev_old;97 dbg("realloc failed");98 goto err;99 }100 101 for (i = 0; i < edev->udev.bNumInterfaces; i++) {102 /* vudc does not support reading interfaces */103 if (!hdriver->ops.read_interface)104 break;105 hdriver->ops.read_interface(&edev->udev, i, &edev->uinf[i]);106 }107 108 return edev;109err:110 if (edev->sudev)111 udev_device_unref(edev->sudev);112 if (edev)113 free(edev);114 115 return NULL;116}117 118static int refresh_exported_devices(struct usbip_host_driver *hdriver)119{120 struct usbip_exported_device *edev;121 struct udev_enumerate *enumerate;122 struct udev_list_entry *devices, *dev_list_entry;123 struct udev_device *dev;124 const char *path;125 126 enumerate = udev_enumerate_new(udev_context);127 udev_enumerate_add_match_subsystem(enumerate, hdriver->udev_subsystem);128 udev_enumerate_scan_devices(enumerate);129 130 devices = udev_enumerate_get_list_entry(enumerate);131 132 udev_list_entry_foreach(dev_list_entry, devices) {133 path = udev_list_entry_get_name(dev_list_entry);134 dev = udev_device_new_from_syspath(udev_context,135 path);136 if (dev == NULL)137 continue;138 139 /* Check whether device uses usbip driver. */140 if (hdriver->ops.is_my_device(dev)) {141 edev = usbip_exported_device_new(hdriver, path);142 if (!edev) {143 dbg("usbip_exported_device_new failed");144 continue;145 }146 147 list_add(&edev->node, &hdriver->edev_list);148 hdriver->ndevs++;149 }150 }151 152 return 0;153}154 155static void usbip_exported_device_destroy(struct list_head *devs)156{157 struct list_head *i, *tmp;158 struct usbip_exported_device *edev;159 160 list_for_each_safe(i, tmp, devs) {161 edev = list_entry(i, struct usbip_exported_device, node);162 list_del(i);163 free(edev);164 }165}166 167int usbip_generic_driver_open(struct usbip_host_driver *hdriver)168{169 int rc;170 171 udev_context = udev_new();172 if (!udev_context) {173 err("udev_new failed");174 return -1;175 }176 177 rc = refresh_exported_devices(hdriver);178 if (rc < 0)179 goto err;180 return 0;181err:182 udev_unref(udev_context);183 return -1;184}185 186void usbip_generic_driver_close(struct usbip_host_driver *hdriver)187{188 if (!hdriver)189 return;190 191 usbip_exported_device_destroy(&hdriver->edev_list);192 193 udev_unref(udev_context);194}195 196int usbip_generic_refresh_device_list(struct usbip_host_driver *hdriver)197{198 int rc;199 200 usbip_exported_device_destroy(&hdriver->edev_list);201 202 hdriver->ndevs = 0;203 INIT_LIST_HEAD(&hdriver->edev_list);204 205 rc = refresh_exported_devices(hdriver);206 if (rc < 0)207 return -1;208 209 return 0;210}211 212int usbip_export_device(struct usbip_exported_device *edev, int sockfd)213{214 char attr_name[] = "usbip_sockfd";215 char sockfd_attr_path[SYSFS_PATH_MAX];216 int size;217 char sockfd_buff[30];218 int ret;219 220 if (edev->status != SDEV_ST_AVAILABLE) {221 dbg("device not available: %s", edev->udev.busid);222 switch (edev->status) {223 case SDEV_ST_ERROR:224 dbg("status SDEV_ST_ERROR");225 ret = ST_DEV_ERR;226 break;227 case SDEV_ST_USED:228 dbg("status SDEV_ST_USED");229 ret = ST_DEV_BUSY;230 break;231 default:232 dbg("status unknown: 0x%x", edev->status);233 ret = -1;234 }235 return ret;236 }237 238 /* only the first interface is true */239 size = snprintf(sockfd_attr_path, sizeof(sockfd_attr_path), "%s/%s",240 edev->udev.path, attr_name);241 if (size < 0 || (unsigned int)size >= sizeof(sockfd_attr_path)) {242 err("exported device path length %i >= %lu or < 0", size,243 (long unsigned)sizeof(sockfd_attr_path));244 return -1;245 }246 247 size = snprintf(sockfd_buff, sizeof(sockfd_buff), "%d\n", sockfd);248 if (size < 0 || (unsigned int)size >= sizeof(sockfd_buff)) {249 err("socket length %i >= %lu or < 0", size,250 (long unsigned)sizeof(sockfd_buff));251 return -1;252 }253 254 ret = write_sysfs_attribute(sockfd_attr_path, sockfd_buff,255 strlen(sockfd_buff));256 if (ret < 0) {257 err("write_sysfs_attribute failed: sockfd %s to %s",258 sockfd_buff, sockfd_attr_path);259 return ret;260 }261 262 info("connect: %s", edev->udev.busid);263 264 return ret;265}266 267struct usbip_exported_device *usbip_generic_get_device(268 struct usbip_host_driver *hdriver, int num)269{270 struct list_head *i;271 struct usbip_exported_device *edev;272 int cnt = 0;273 274 list_for_each(i, &hdriver->edev_list) {275 edev = list_entry(i, struct usbip_exported_device, node);276 if (num == cnt)277 return edev;278 cnt++;279 }280 281 return NULL;282}283