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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2015-2016 Samsung Electronics
4 * Igor Kotrasinski <[email protected]>
5 * Krzysztof Opasiak <[email protected]>
6 *
7 * Refactored from usbip_host_driver.c, which is:
8 * Copyright (C) 2011 matt mooney <[email protected]>
9 * 2005-2007 Takahiro Hirofuchi
10 */
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
64static
65struct 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 if (hdriver->ndevs == 0)
153 info("Please load appropriate modules or export devices.");
154
155 return 0;
156}
157
158static void usbip_exported_device_destroy(struct list_head *devs)
159{
160 struct list_head *i, *tmp;
161 struct usbip_exported_device *edev;
162
163 list_for_each_safe(i, tmp, devs) {
164 edev = list_entry(i, struct usbip_exported_device, node);
165 list_del(i);
166 free(edev);
167 }
168}
169
170int usbip_generic_driver_open(struct usbip_host_driver *hdriver)
171{
172 int rc;
173
174 udev_context = udev_new();
175 if (!udev_context) {
176 err("udev_new failed");
177 return -1;
178 }
179
180 rc = refresh_exported_devices(hdriver);
181 if (rc < 0)
182 goto err;
183 return 0;
184err:
185 udev_unref(udev_context);
186 return -1;
187}
188
189void usbip_generic_driver_close(struct usbip_host_driver *hdriver)
190{
191 if (!hdriver)
192 return;
193
194 usbip_exported_device_destroy(&hdriver->edev_list);
195
196 udev_unref(udev_context);
197}
198
199int usbip_generic_refresh_device_list(struct usbip_host_driver *hdriver)
200{
201 int rc;
202
203 usbip_exported_device_destroy(&hdriver->edev_list);
204
205 hdriver->ndevs = 0;
206 INIT_LIST_HEAD(&hdriver->edev_list);
207
208 rc = refresh_exported_devices(hdriver);
209 if (rc < 0)
210 return -1;
211
212 return 0;
213}
214
215int usbip_export_device(struct usbip_exported_device *edev, int sockfd)
216{
217 char attr_name[] = "usbip_sockfd";
218 char sockfd_attr_path[SYSFS_PATH_MAX];
219 int size;
220 char sockfd_buff[30];
221 int ret;
222
223 if (edev->status != SDEV_ST_AVAILABLE) {
224 dbg("device not available: %s", edev->udev.busid);
225 switch (edev->status) {
226 case SDEV_ST_ERROR:
227 dbg("status SDEV_ST_ERROR");
228 ret = ST_DEV_ERR;
229 break;
230 case SDEV_ST_USED:
231 dbg("status SDEV_ST_USED");
232 ret = ST_DEV_BUSY;
233 break;
234 default:
235 dbg("status unknown: 0x%x", edev->status);
236 ret = -1;
237 }
238 return ret;
239 }
240
241 /* only the first interface is true */
242 size = snprintf(sockfd_attr_path, sizeof(sockfd_attr_path), "%s/%s",
243 edev->udev.path, attr_name);
244 if (size < 0 || (unsigned int)size >= sizeof(sockfd_attr_path)) {
245 err("exported device path length %i >= %lu or < 0", size,
246 (long unsigned)sizeof(sockfd_attr_path));
247 return -1;
248 }
249
250 size = snprintf(sockfd_buff, sizeof(sockfd_buff), "%d\n", sockfd);
251 if (size < 0 || (unsigned int)size >= sizeof(sockfd_buff)) {
252 err("socket length %i >= %lu or < 0", size,
253 (long unsigned)sizeof(sockfd_buff));
254 return -1;
255 }
256
257 ret = write_sysfs_attribute(sockfd_attr_path, sockfd_buff,
258 strlen(sockfd_buff));
259 if (ret < 0) {
260 err("write_sysfs_attribute failed: sockfd %s to %s",
261 sockfd_buff, sockfd_attr_path);
262 return ret;
263 }
264
265 info("connect: %s", edev->udev.busid);
266
267 return ret;
268}
269
270struct usbip_exported_device *usbip_generic_get_device(
271 struct usbip_host_driver *hdriver, int num)
272{
273 struct list_head *i;
274 struct usbip_exported_device *edev;
275 int cnt = 0;
276
277 list_for_each(i, &hdriver->edev_list) {
278 edev = list_entry(i, struct usbip_exported_device, node);
279 if (num == cnt)
280 return edev;
281 cnt++;
282 }
283
284 return NULL;
285}