1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
4 * Copyright (C) 2015-2016 Samsung Electronics
5 * Igor Kotrasinski <i.kotrasinsk@samsung.com>
6 */
7
8 #include <net/sock.h>
9 #include <linux/list.h>
10 #include <linux/kthread.h>
11
12 #include "usbip_common.h"
13 #include "vudc.h"
14
alloc_urb_from_cmd(struct urb ** urbp,struct usbip_header * pdu,u8 type)15 static int alloc_urb_from_cmd(struct urb **urbp,
16 struct usbip_header *pdu, u8 type)
17 {
18 struct urb *urb;
19
20 if (type == USB_ENDPOINT_XFER_ISOC)
21 urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets,
22 GFP_KERNEL);
23 else
24 urb = usb_alloc_urb(0, GFP_KERNEL);
25
26 if (!urb)
27 goto err;
28
29 usbip_pack_pdu(pdu, urb, USBIP_CMD_SUBMIT, 0);
30
31 if (urb->transfer_buffer_length > 0) {
32 urb->transfer_buffer = kzalloc(urb->transfer_buffer_length,
33 GFP_KERNEL);
34 if (!urb->transfer_buffer)
35 goto free_urb;
36 }
37
38 urb->setup_packet = kmemdup(&pdu->u.cmd_submit.setup, 8,
39 GFP_KERNEL);
40 if (!urb->setup_packet)
41 goto free_buffer;
42
43 /*
44 * FIXME - we only setup pipe enough for usbip functions
45 * to behave nicely
46 */
47 urb->pipe |= pdu->base.direction == USBIP_DIR_IN ?
48 USB_DIR_IN : USB_DIR_OUT;
49
50 *urbp = urb;
51 return 0;
52
53 free_buffer:
54 kfree(urb->transfer_buffer);
55 urb->transfer_buffer = NULL;
56 free_urb:
57 usb_free_urb(urb);
58 err:
59 return -ENOMEM;
60 }
61
v_recv_cmd_unlink(struct vudc * udc,struct usbip_header * pdu)62 static int v_recv_cmd_unlink(struct vudc *udc,
63 struct usbip_header *pdu)
64 {
65 unsigned long flags;
66 struct urbp *urb_p;
67
68 spin_lock_irqsave(&udc->lock, flags);
69 list_for_each_entry(urb_p, &udc->urb_queue, urb_entry) {
70 if (urb_p->seqnum != pdu->u.cmd_unlink.seqnum)
71 continue;
72 urb_p->urb->unlinked = -ECONNRESET;
73 urb_p->seqnum = pdu->base.seqnum;
74 v_kick_timer(udc, jiffies);
75 spin_unlock_irqrestore(&udc->lock, flags);
76 return 0;
77 }
78 /* Not found, completed / not queued */
79 spin_lock(&udc->lock_tx);
80 v_enqueue_ret_unlink(udc, pdu->base.seqnum, 0);
81 wake_up(&udc->tx_waitq);
82 spin_unlock(&udc->lock_tx);
83 spin_unlock_irqrestore(&udc->lock, flags);
84
85 return 0;
86 }
87
v_recv_cmd_submit(struct vudc * udc,struct usbip_header * pdu)88 static int v_recv_cmd_submit(struct vudc *udc,
89 struct usbip_header *pdu)
90 {
91 int ret = 0;
92 struct urbp *urb_p;
93 u8 address;
94 unsigned long flags;
95
96 urb_p = alloc_urbp();
97 if (!urb_p) {
98 usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC);
99 return -ENOMEM;
100 }
101
102 /* base.ep is pipeendpoint(pipe) */
103 address = pdu->base.ep;
104 if (pdu->base.direction == USBIP_DIR_IN)
105 address |= USB_DIR_IN;
106
107 spin_lock_irqsave(&udc->lock, flags);
108 urb_p->ep = vudc_find_endpoint(udc, address);
109 if (!urb_p->ep) {
110 /* we don't know the type, there may be isoc data! */
111 dev_err(&udc->pdev->dev, "request to nonexistent endpoint");
112 spin_unlock_irqrestore(&udc->lock, flags);
113 usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
114 ret = -EPIPE;
115 goto free_urbp;
116 }
117 urb_p->type = urb_p->ep->type;
118 spin_unlock_irqrestore(&udc->lock, flags);
119
120 urb_p->new = 1;
121 urb_p->seqnum = pdu->base.seqnum;
122
123 if (urb_p->ep->type == USB_ENDPOINT_XFER_ISOC) {
124 /* validate packet size and number of packets */
125 unsigned int maxp, packets, bytes;
126
127 maxp = usb_endpoint_maxp(urb_p->ep->desc);
128 maxp *= usb_endpoint_maxp_mult(urb_p->ep->desc);
129 bytes = pdu->u.cmd_submit.transfer_buffer_length;
130 packets = DIV_ROUND_UP(bytes, maxp);
131
132 if (pdu->u.cmd_submit.number_of_packets < 0 ||
133 pdu->u.cmd_submit.number_of_packets > packets) {
134 dev_err(&udc->gadget.dev,
135 "CMD_SUBMIT: isoc invalid num packets %d\n",
136 pdu->u.cmd_submit.number_of_packets);
137 ret = -EMSGSIZE;
138 goto free_urbp;
139 }
140 }
141
142 ret = alloc_urb_from_cmd(&urb_p->urb, pdu, urb_p->ep->type);
143 if (ret) {
144 usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_MALLOC);
145 ret = -ENOMEM;
146 goto free_urbp;
147 }
148
149 urb_p->urb->status = -EINPROGRESS;
150
151 /* FIXME: more pipe setup to please usbip_common */
152 BUILD_BUG_ON_MSG(PIPE_BULK != 3, "PIPE_* doesn't range from 0 to 3");
153
154 urb_p->urb->pipe &= ~(PIPE_BULK << 30);
155 switch (urb_p->ep->type) {
156 case USB_ENDPOINT_XFER_BULK:
157 urb_p->urb->pipe |= (PIPE_BULK << 30);
158 break;
159 case USB_ENDPOINT_XFER_INT:
160 urb_p->urb->pipe |= (PIPE_INTERRUPT << 30);
161 break;
162 case USB_ENDPOINT_XFER_CONTROL:
163 urb_p->urb->pipe |= (PIPE_CONTROL << 30);
164 break;
165 case USB_ENDPOINT_XFER_ISOC:
166 urb_p->urb->pipe |= (PIPE_ISOCHRONOUS << 30);
167 break;
168 }
169 ret = usbip_recv_xbuff(&udc->ud, urb_p->urb);
170 if (ret < 0)
171 goto free_urbp;
172
173 ret = usbip_recv_iso(&udc->ud, urb_p->urb);
174 if (ret < 0)
175 goto free_urbp;
176
177 spin_lock_irqsave(&udc->lock, flags);
178 v_kick_timer(udc, jiffies);
179 list_add_tail(&urb_p->urb_entry, &udc->urb_queue);
180 spin_unlock_irqrestore(&udc->lock, flags);
181
182 return 0;
183
184 free_urbp:
185 free_urbp_and_urb(urb_p);
186 return ret;
187 }
188
v_rx_pdu(struct usbip_device * ud)189 static int v_rx_pdu(struct usbip_device *ud)
190 {
191 int ret;
192 struct usbip_header pdu;
193 struct vudc *udc = container_of(ud, struct vudc, ud);
194
195 memset(&pdu, 0, sizeof(pdu));
196 ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
197 if (ret != sizeof(pdu)) {
198 usbip_event_add(ud, VUDC_EVENT_ERROR_TCP);
199 if (ret >= 0)
200 return -EPIPE;
201 return ret;
202 }
203 usbip_header_correct_endian(&pdu, 0);
204
205 spin_lock_irq(&ud->lock);
206 ret = (ud->status == SDEV_ST_USED);
207 spin_unlock_irq(&ud->lock);
208 if (!ret) {
209 usbip_event_add(ud, VUDC_EVENT_ERROR_TCP);
210 return -EBUSY;
211 }
212
213 switch (pdu.base.command) {
214 case USBIP_CMD_UNLINK:
215 ret = v_recv_cmd_unlink(udc, &pdu);
216 break;
217 case USBIP_CMD_SUBMIT:
218 ret = v_recv_cmd_submit(udc, &pdu);
219 break;
220 default:
221 ret = -EPIPE;
222 pr_err("rx: unknown command");
223 break;
224 }
225 return ret;
226 }
227
v_rx_loop(void * data)228 int v_rx_loop(void *data)
229 {
230 struct usbip_device *ud = data;
231 int ret = 0;
232
233 while (!kthread_should_stop()) {
234 if (usbip_event_happened(ud))
235 break;
236 ret = v_rx_pdu(ud);
237 if (ret < 0) {
238 pr_warn("v_rx exit with error %d", ret);
239 break;
240 }
241 }
242 return ret;
243 }
244