]>
Commit | Line | Data |
---|---|---|
06a8fc78 AH |
1 | /* |
2 | * common code for virtio vsock | |
3 | * | |
4 | * Copyright (C) 2013-2015 Red Hat, Inc. | |
5 | * Author: Asias He <asias@redhat.com> | |
6 | * Stefan Hajnoczi <stefanha@redhat.com> | |
7 | * | |
8 | * This work is licensed under the terms of the GNU GPL, version 2. | |
9 | */ | |
10 | #include <linux/spinlock.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/ctype.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/virtio.h> | |
15 | #include <linux/virtio_ids.h> | |
16 | #include <linux/virtio_config.h> | |
17 | #include <linux/virtio_vsock.h> | |
18 | ||
19 | #include <net/sock.h> | |
20 | #include <net/af_vsock.h> | |
21 | ||
22 | #define CREATE_TRACE_POINTS | |
23 | #include <trace/events/vsock_virtio_transport_common.h> | |
24 | ||
25 | /* How long to wait for graceful shutdown of a connection */ | |
26 | #define VSOCK_CLOSE_TIMEOUT (8 * HZ) | |
27 | ||
28 | static const struct virtio_transport *virtio_transport_get_ops(void) | |
29 | { | |
30 | const struct vsock_transport *t = vsock_core_get_transport(); | |
31 | ||
32 | return container_of(t, struct virtio_transport, transport); | |
33 | } | |
34 | ||
819483d8 | 35 | static struct virtio_vsock_pkt * |
06a8fc78 AH |
36 | virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info, |
37 | size_t len, | |
38 | u32 src_cid, | |
39 | u32 src_port, | |
40 | u32 dst_cid, | |
41 | u32 dst_port) | |
42 | { | |
43 | struct virtio_vsock_pkt *pkt; | |
44 | int err; | |
45 | ||
46 | pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); | |
47 | if (!pkt) | |
48 | return NULL; | |
49 | ||
50 | pkt->hdr.type = cpu_to_le16(info->type); | |
51 | pkt->hdr.op = cpu_to_le16(info->op); | |
52 | pkt->hdr.src_cid = cpu_to_le64(src_cid); | |
53 | pkt->hdr.dst_cid = cpu_to_le64(dst_cid); | |
54 | pkt->hdr.src_port = cpu_to_le32(src_port); | |
55 | pkt->hdr.dst_port = cpu_to_le32(dst_port); | |
56 | pkt->hdr.flags = cpu_to_le32(info->flags); | |
57 | pkt->len = len; | |
58 | pkt->hdr.len = cpu_to_le32(len); | |
59 | pkt->reply = info->reply; | |
60 | ||
61 | if (info->msg && len > 0) { | |
62 | pkt->buf = kmalloc(len, GFP_KERNEL); | |
63 | if (!pkt->buf) | |
64 | goto out_pkt; | |
65 | err = memcpy_from_msg(pkt->buf, info->msg, len); | |
66 | if (err) | |
67 | goto out; | |
68 | } | |
69 | ||
70 | trace_virtio_transport_alloc_pkt(src_cid, src_port, | |
71 | dst_cid, dst_port, | |
72 | len, | |
73 | info->type, | |
74 | info->op, | |
75 | info->flags); | |
76 | ||
77 | return pkt; | |
78 | ||
79 | out: | |
80 | kfree(pkt->buf); | |
81 | out_pkt: | |
82 | kfree(pkt); | |
83 | return NULL; | |
84 | } | |
06a8fc78 AH |
85 | |
86 | static int virtio_transport_send_pkt_info(struct vsock_sock *vsk, | |
87 | struct virtio_vsock_pkt_info *info) | |
88 | { | |
89 | u32 src_cid, src_port, dst_cid, dst_port; | |
90 | struct virtio_vsock_sock *vvs; | |
91 | struct virtio_vsock_pkt *pkt; | |
92 | u32 pkt_len = info->pkt_len; | |
93 | ||
94 | src_cid = vm_sockets_get_local_cid(); | |
95 | src_port = vsk->local_addr.svm_port; | |
96 | if (!info->remote_cid) { | |
97 | dst_cid = vsk->remote_addr.svm_cid; | |
98 | dst_port = vsk->remote_addr.svm_port; | |
99 | } else { | |
100 | dst_cid = info->remote_cid; | |
101 | dst_port = info->remote_port; | |
102 | } | |
103 | ||
104 | vvs = vsk->trans; | |
105 | ||
106 | /* we can send less than pkt_len bytes */ | |
107 | if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE) | |
108 | pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE; | |
109 | ||
110 | /* virtio_transport_get_credit might return less than pkt_len credit */ | |
111 | pkt_len = virtio_transport_get_credit(vvs, pkt_len); | |
112 | ||
113 | /* Do not send zero length OP_RW pkt */ | |
114 | if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW) | |
115 | return pkt_len; | |
116 | ||
117 | pkt = virtio_transport_alloc_pkt(info, pkt_len, | |
118 | src_cid, src_port, | |
119 | dst_cid, dst_port); | |
120 | if (!pkt) { | |
121 | virtio_transport_put_credit(vvs, pkt_len); | |
122 | return -ENOMEM; | |
123 | } | |
124 | ||
125 | virtio_transport_inc_tx_pkt(vvs, pkt); | |
126 | ||
127 | return virtio_transport_get_ops()->send_pkt(pkt); | |
128 | } | |
129 | ||
130 | static void virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs, | |
131 | struct virtio_vsock_pkt *pkt) | |
132 | { | |
133 | vvs->rx_bytes += pkt->len; | |
134 | } | |
135 | ||
136 | static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs, | |
137 | struct virtio_vsock_pkt *pkt) | |
138 | { | |
139 | vvs->rx_bytes -= pkt->len; | |
140 | vvs->fwd_cnt += pkt->len; | |
141 | } | |
142 | ||
143 | void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt) | |
144 | { | |
145 | spin_lock_bh(&vvs->tx_lock); | |
146 | pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt); | |
147 | pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc); | |
148 | spin_unlock_bh(&vvs->tx_lock); | |
149 | } | |
150 | EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt); | |
151 | ||
152 | u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit) | |
153 | { | |
154 | u32 ret; | |
155 | ||
156 | spin_lock_bh(&vvs->tx_lock); | |
157 | ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); | |
158 | if (ret > credit) | |
159 | ret = credit; | |
160 | vvs->tx_cnt += ret; | |
161 | spin_unlock_bh(&vvs->tx_lock); | |
162 | ||
163 | return ret; | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(virtio_transport_get_credit); | |
166 | ||
167 | void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit) | |
168 | { | |
169 | spin_lock_bh(&vvs->tx_lock); | |
170 | vvs->tx_cnt -= credit; | |
171 | spin_unlock_bh(&vvs->tx_lock); | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(virtio_transport_put_credit); | |
174 | ||
175 | static int virtio_transport_send_credit_update(struct vsock_sock *vsk, | |
176 | int type, | |
177 | struct virtio_vsock_hdr *hdr) | |
178 | { | |
179 | struct virtio_vsock_pkt_info info = { | |
180 | .op = VIRTIO_VSOCK_OP_CREDIT_UPDATE, | |
181 | .type = type, | |
182 | }; | |
183 | ||
184 | return virtio_transport_send_pkt_info(vsk, &info); | |
185 | } | |
186 | ||
187 | static ssize_t | |
188 | virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, | |
189 | struct msghdr *msg, | |
190 | size_t len) | |
191 | { | |
192 | struct virtio_vsock_sock *vvs = vsk->trans; | |
193 | struct virtio_vsock_pkt *pkt; | |
194 | size_t bytes, total = 0; | |
195 | int err = -EFAULT; | |
196 | ||
197 | spin_lock_bh(&vvs->rx_lock); | |
198 | while (total < len && !list_empty(&vvs->rx_queue)) { | |
199 | pkt = list_first_entry(&vvs->rx_queue, | |
200 | struct virtio_vsock_pkt, list); | |
201 | ||
202 | bytes = len - total; | |
203 | if (bytes > pkt->len - pkt->off) | |
204 | bytes = pkt->len - pkt->off; | |
205 | ||
206 | /* sk_lock is held by caller so no one else can dequeue. | |
207 | * Unlock rx_lock since memcpy_to_msg() may sleep. | |
208 | */ | |
209 | spin_unlock_bh(&vvs->rx_lock); | |
210 | ||
211 | err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes); | |
212 | if (err) | |
213 | goto out; | |
214 | ||
215 | spin_lock_bh(&vvs->rx_lock); | |
216 | ||
217 | total += bytes; | |
218 | pkt->off += bytes; | |
219 | if (pkt->off == pkt->len) { | |
220 | virtio_transport_dec_rx_pkt(vvs, pkt); | |
221 | list_del(&pkt->list); | |
222 | virtio_transport_free_pkt(pkt); | |
223 | } | |
224 | } | |
225 | spin_unlock_bh(&vvs->rx_lock); | |
226 | ||
227 | /* Send a credit pkt to peer */ | |
228 | virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM, | |
229 | NULL); | |
230 | ||
231 | return total; | |
232 | ||
233 | out: | |
234 | if (total) | |
235 | err = total; | |
236 | return err; | |
237 | } | |
238 | ||
239 | ssize_t | |
240 | virtio_transport_stream_dequeue(struct vsock_sock *vsk, | |
241 | struct msghdr *msg, | |
242 | size_t len, int flags) | |
243 | { | |
244 | if (flags & MSG_PEEK) | |
245 | return -EOPNOTSUPP; | |
246 | ||
247 | return virtio_transport_stream_do_dequeue(vsk, msg, len); | |
248 | } | |
249 | EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue); | |
250 | ||
251 | int | |
252 | virtio_transport_dgram_dequeue(struct vsock_sock *vsk, | |
253 | struct msghdr *msg, | |
254 | size_t len, int flags) | |
255 | { | |
256 | return -EOPNOTSUPP; | |
257 | } | |
258 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue); | |
259 | ||
260 | s64 virtio_transport_stream_has_data(struct vsock_sock *vsk) | |
261 | { | |
262 | struct virtio_vsock_sock *vvs = vsk->trans; | |
263 | s64 bytes; | |
264 | ||
265 | spin_lock_bh(&vvs->rx_lock); | |
266 | bytes = vvs->rx_bytes; | |
267 | spin_unlock_bh(&vvs->rx_lock); | |
268 | ||
269 | return bytes; | |
270 | } | |
271 | EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data); | |
272 | ||
273 | static s64 virtio_transport_has_space(struct vsock_sock *vsk) | |
274 | { | |
275 | struct virtio_vsock_sock *vvs = vsk->trans; | |
276 | s64 bytes; | |
277 | ||
278 | bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); | |
279 | if (bytes < 0) | |
280 | bytes = 0; | |
281 | ||
282 | return bytes; | |
283 | } | |
284 | ||
285 | s64 virtio_transport_stream_has_space(struct vsock_sock *vsk) | |
286 | { | |
287 | struct virtio_vsock_sock *vvs = vsk->trans; | |
288 | s64 bytes; | |
289 | ||
290 | spin_lock_bh(&vvs->tx_lock); | |
291 | bytes = virtio_transport_has_space(vsk); | |
292 | spin_unlock_bh(&vvs->tx_lock); | |
293 | ||
294 | return bytes; | |
295 | } | |
296 | EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space); | |
297 | ||
298 | int virtio_transport_do_socket_init(struct vsock_sock *vsk, | |
299 | struct vsock_sock *psk) | |
300 | { | |
301 | struct virtio_vsock_sock *vvs; | |
302 | ||
303 | vvs = kzalloc(sizeof(*vvs), GFP_KERNEL); | |
304 | if (!vvs) | |
305 | return -ENOMEM; | |
306 | ||
307 | vsk->trans = vvs; | |
308 | vvs->vsk = vsk; | |
309 | if (psk) { | |
310 | struct virtio_vsock_sock *ptrans = psk->trans; | |
311 | ||
312 | vvs->buf_size = ptrans->buf_size; | |
313 | vvs->buf_size_min = ptrans->buf_size_min; | |
314 | vvs->buf_size_max = ptrans->buf_size_max; | |
315 | vvs->peer_buf_alloc = ptrans->peer_buf_alloc; | |
316 | } else { | |
317 | vvs->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE; | |
318 | vvs->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE; | |
319 | vvs->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE; | |
320 | } | |
321 | ||
322 | vvs->buf_alloc = vvs->buf_size; | |
323 | ||
324 | spin_lock_init(&vvs->rx_lock); | |
325 | spin_lock_init(&vvs->tx_lock); | |
326 | INIT_LIST_HEAD(&vvs->rx_queue); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init); | |
331 | ||
332 | u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk) | |
333 | { | |
334 | struct virtio_vsock_sock *vvs = vsk->trans; | |
335 | ||
336 | return vvs->buf_size; | |
337 | } | |
338 | EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size); | |
339 | ||
340 | u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk) | |
341 | { | |
342 | struct virtio_vsock_sock *vvs = vsk->trans; | |
343 | ||
344 | return vvs->buf_size_min; | |
345 | } | |
346 | EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size); | |
347 | ||
348 | u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk) | |
349 | { | |
350 | struct virtio_vsock_sock *vvs = vsk->trans; | |
351 | ||
352 | return vvs->buf_size_max; | |
353 | } | |
354 | EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size); | |
355 | ||
356 | void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val) | |
357 | { | |
358 | struct virtio_vsock_sock *vvs = vsk->trans; | |
359 | ||
360 | if (val > VIRTIO_VSOCK_MAX_BUF_SIZE) | |
361 | val = VIRTIO_VSOCK_MAX_BUF_SIZE; | |
362 | if (val < vvs->buf_size_min) | |
363 | vvs->buf_size_min = val; | |
364 | if (val > vvs->buf_size_max) | |
365 | vvs->buf_size_max = val; | |
366 | vvs->buf_size = val; | |
367 | vvs->buf_alloc = val; | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size); | |
370 | ||
371 | void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val) | |
372 | { | |
373 | struct virtio_vsock_sock *vvs = vsk->trans; | |
374 | ||
375 | if (val > VIRTIO_VSOCK_MAX_BUF_SIZE) | |
376 | val = VIRTIO_VSOCK_MAX_BUF_SIZE; | |
377 | if (val > vvs->buf_size) | |
378 | vvs->buf_size = val; | |
379 | vvs->buf_size_min = val; | |
380 | } | |
381 | EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size); | |
382 | ||
383 | void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val) | |
384 | { | |
385 | struct virtio_vsock_sock *vvs = vsk->trans; | |
386 | ||
387 | if (val > VIRTIO_VSOCK_MAX_BUF_SIZE) | |
388 | val = VIRTIO_VSOCK_MAX_BUF_SIZE; | |
389 | if (val < vvs->buf_size) | |
390 | vvs->buf_size = val; | |
391 | vvs->buf_size_max = val; | |
392 | } | |
393 | EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size); | |
394 | ||
395 | int | |
396 | virtio_transport_notify_poll_in(struct vsock_sock *vsk, | |
397 | size_t target, | |
398 | bool *data_ready_now) | |
399 | { | |
400 | if (vsock_stream_has_data(vsk)) | |
401 | *data_ready_now = true; | |
402 | else | |
403 | *data_ready_now = false; | |
404 | ||
405 | return 0; | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in); | |
408 | ||
409 | int | |
410 | virtio_transport_notify_poll_out(struct vsock_sock *vsk, | |
411 | size_t target, | |
412 | bool *space_avail_now) | |
413 | { | |
414 | s64 free_space; | |
415 | ||
416 | free_space = vsock_stream_has_space(vsk); | |
417 | if (free_space > 0) | |
418 | *space_avail_now = true; | |
419 | else if (free_space == 0) | |
420 | *space_avail_now = false; | |
421 | ||
422 | return 0; | |
423 | } | |
424 | EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out); | |
425 | ||
426 | int virtio_transport_notify_recv_init(struct vsock_sock *vsk, | |
427 | size_t target, struct vsock_transport_recv_notify_data *data) | |
428 | { | |
429 | return 0; | |
430 | } | |
431 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init); | |
432 | ||
433 | int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, | |
434 | size_t target, struct vsock_transport_recv_notify_data *data) | |
435 | { | |
436 | return 0; | |
437 | } | |
438 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block); | |
439 | ||
440 | int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, | |
441 | size_t target, struct vsock_transport_recv_notify_data *data) | |
442 | { | |
443 | return 0; | |
444 | } | |
445 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue); | |
446 | ||
447 | int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, | |
448 | size_t target, ssize_t copied, bool data_read, | |
449 | struct vsock_transport_recv_notify_data *data) | |
450 | { | |
451 | return 0; | |
452 | } | |
453 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue); | |
454 | ||
455 | int virtio_transport_notify_send_init(struct vsock_sock *vsk, | |
456 | struct vsock_transport_send_notify_data *data) | |
457 | { | |
458 | return 0; | |
459 | } | |
460 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init); | |
461 | ||
462 | int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, | |
463 | struct vsock_transport_send_notify_data *data) | |
464 | { | |
465 | return 0; | |
466 | } | |
467 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block); | |
468 | ||
469 | int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, | |
470 | struct vsock_transport_send_notify_data *data) | |
471 | { | |
472 | return 0; | |
473 | } | |
474 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue); | |
475 | ||
476 | int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, | |
477 | ssize_t written, struct vsock_transport_send_notify_data *data) | |
478 | { | |
479 | return 0; | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue); | |
482 | ||
483 | u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk) | |
484 | { | |
485 | struct virtio_vsock_sock *vvs = vsk->trans; | |
486 | ||
487 | return vvs->buf_size; | |
488 | } | |
489 | EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat); | |
490 | ||
491 | bool virtio_transport_stream_is_active(struct vsock_sock *vsk) | |
492 | { | |
493 | return true; | |
494 | } | |
495 | EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active); | |
496 | ||
497 | bool virtio_transport_stream_allow(u32 cid, u32 port) | |
498 | { | |
499 | return true; | |
500 | } | |
501 | EXPORT_SYMBOL_GPL(virtio_transport_stream_allow); | |
502 | ||
503 | int virtio_transport_dgram_bind(struct vsock_sock *vsk, | |
504 | struct sockaddr_vm *addr) | |
505 | { | |
506 | return -EOPNOTSUPP; | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind); | |
509 | ||
510 | bool virtio_transport_dgram_allow(u32 cid, u32 port) | |
511 | { | |
512 | return false; | |
513 | } | |
514 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow); | |
515 | ||
516 | int virtio_transport_connect(struct vsock_sock *vsk) | |
517 | { | |
518 | struct virtio_vsock_pkt_info info = { | |
519 | .op = VIRTIO_VSOCK_OP_REQUEST, | |
520 | .type = VIRTIO_VSOCK_TYPE_STREAM, | |
521 | }; | |
522 | ||
523 | return virtio_transport_send_pkt_info(vsk, &info); | |
524 | } | |
525 | EXPORT_SYMBOL_GPL(virtio_transport_connect); | |
526 | ||
527 | int virtio_transport_shutdown(struct vsock_sock *vsk, int mode) | |
528 | { | |
529 | struct virtio_vsock_pkt_info info = { | |
530 | .op = VIRTIO_VSOCK_OP_SHUTDOWN, | |
531 | .type = VIRTIO_VSOCK_TYPE_STREAM, | |
532 | .flags = (mode & RCV_SHUTDOWN ? | |
533 | VIRTIO_VSOCK_SHUTDOWN_RCV : 0) | | |
534 | (mode & SEND_SHUTDOWN ? | |
535 | VIRTIO_VSOCK_SHUTDOWN_SEND : 0), | |
536 | }; | |
537 | ||
538 | return virtio_transport_send_pkt_info(vsk, &info); | |
539 | } | |
540 | EXPORT_SYMBOL_GPL(virtio_transport_shutdown); | |
541 | ||
542 | int | |
543 | virtio_transport_dgram_enqueue(struct vsock_sock *vsk, | |
544 | struct sockaddr_vm *remote_addr, | |
545 | struct msghdr *msg, | |
546 | size_t dgram_len) | |
547 | { | |
548 | return -EOPNOTSUPP; | |
549 | } | |
550 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue); | |
551 | ||
552 | ssize_t | |
553 | virtio_transport_stream_enqueue(struct vsock_sock *vsk, | |
554 | struct msghdr *msg, | |
555 | size_t len) | |
556 | { | |
557 | struct virtio_vsock_pkt_info info = { | |
558 | .op = VIRTIO_VSOCK_OP_RW, | |
559 | .type = VIRTIO_VSOCK_TYPE_STREAM, | |
560 | .msg = msg, | |
561 | .pkt_len = len, | |
562 | }; | |
563 | ||
564 | return virtio_transport_send_pkt_info(vsk, &info); | |
565 | } | |
566 | EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue); | |
567 | ||
568 | void virtio_transport_destruct(struct vsock_sock *vsk) | |
569 | { | |
570 | struct virtio_vsock_sock *vvs = vsk->trans; | |
571 | ||
572 | kfree(vvs); | |
573 | } | |
574 | EXPORT_SYMBOL_GPL(virtio_transport_destruct); | |
575 | ||
576 | static int virtio_transport_reset(struct vsock_sock *vsk, | |
577 | struct virtio_vsock_pkt *pkt) | |
578 | { | |
579 | struct virtio_vsock_pkt_info info = { | |
580 | .op = VIRTIO_VSOCK_OP_RST, | |
581 | .type = VIRTIO_VSOCK_TYPE_STREAM, | |
582 | .reply = !!pkt, | |
583 | }; | |
584 | ||
585 | /* Send RST only if the original pkt is not a RST pkt */ | |
586 | if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) | |
587 | return 0; | |
588 | ||
589 | return virtio_transport_send_pkt_info(vsk, &info); | |
590 | } | |
591 | ||
592 | /* Normally packets are associated with a socket. There may be no socket if an | |
593 | * attempt was made to connect to a socket that does not exist. | |
594 | */ | |
595 | static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt) | |
596 | { | |
597 | struct virtio_vsock_pkt_info info = { | |
598 | .op = VIRTIO_VSOCK_OP_RST, | |
599 | .type = le16_to_cpu(pkt->hdr.type), | |
600 | .reply = true, | |
601 | }; | |
602 | ||
603 | /* Send RST only if the original pkt is not a RST pkt */ | |
604 | if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) | |
605 | return 0; | |
606 | ||
607 | pkt = virtio_transport_alloc_pkt(&info, 0, | |
f83f12d6 | 608 | le64_to_cpu(pkt->hdr.dst_cid), |
06a8fc78 | 609 | le32_to_cpu(pkt->hdr.dst_port), |
f83f12d6 | 610 | le64_to_cpu(pkt->hdr.src_cid), |
06a8fc78 AH |
611 | le32_to_cpu(pkt->hdr.src_port)); |
612 | if (!pkt) | |
613 | return -ENOMEM; | |
614 | ||
615 | return virtio_transport_get_ops()->send_pkt(pkt); | |
616 | } | |
617 | ||
618 | static void virtio_transport_wait_close(struct sock *sk, long timeout) | |
619 | { | |
620 | if (timeout) { | |
d9dc8b0f WC |
621 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
622 | ||
623 | add_wait_queue(sk_sleep(sk), &wait); | |
06a8fc78 AH |
624 | |
625 | do { | |
06a8fc78 | 626 | if (sk_wait_event(sk, &timeout, |
d9dc8b0f | 627 | sock_flag(sk, SOCK_DONE), &wait)) |
06a8fc78 AH |
628 | break; |
629 | } while (!signal_pending(current) && timeout); | |
630 | ||
d9dc8b0f | 631 | remove_wait_queue(sk_sleep(sk), &wait); |
06a8fc78 AH |
632 | } |
633 | } | |
634 | ||
635 | static void virtio_transport_do_close(struct vsock_sock *vsk, | |
636 | bool cancel_timeout) | |
637 | { | |
638 | struct sock *sk = sk_vsock(vsk); | |
639 | ||
640 | sock_set_flag(sk, SOCK_DONE); | |
641 | vsk->peer_shutdown = SHUTDOWN_MASK; | |
642 | if (vsock_stream_has_data(vsk) <= 0) | |
643 | sk->sk_state = SS_DISCONNECTING; | |
644 | sk->sk_state_change(sk); | |
645 | ||
646 | if (vsk->close_work_scheduled && | |
647 | (!cancel_timeout || cancel_delayed_work(&vsk->close_work))) { | |
648 | vsk->close_work_scheduled = false; | |
649 | ||
650 | vsock_remove_sock(vsk); | |
651 | ||
652 | /* Release refcnt obtained when we scheduled the timeout */ | |
653 | sock_put(sk); | |
654 | } | |
655 | } | |
656 | ||
657 | static void virtio_transport_close_timeout(struct work_struct *work) | |
658 | { | |
659 | struct vsock_sock *vsk = | |
660 | container_of(work, struct vsock_sock, close_work.work); | |
661 | struct sock *sk = sk_vsock(vsk); | |
662 | ||
663 | sock_hold(sk); | |
664 | lock_sock(sk); | |
665 | ||
666 | if (!sock_flag(sk, SOCK_DONE)) { | |
667 | (void)virtio_transport_reset(vsk, NULL); | |
668 | ||
669 | virtio_transport_do_close(vsk, false); | |
670 | } | |
671 | ||
672 | vsk->close_work_scheduled = false; | |
673 | ||
674 | release_sock(sk); | |
675 | sock_put(sk); | |
676 | } | |
677 | ||
678 | /* User context, vsk->sk is locked */ | |
679 | static bool virtio_transport_close(struct vsock_sock *vsk) | |
680 | { | |
681 | struct sock *sk = &vsk->sk; | |
682 | ||
683 | if (!(sk->sk_state == SS_CONNECTED || | |
684 | sk->sk_state == SS_DISCONNECTING)) | |
685 | return true; | |
686 | ||
687 | /* Already received SHUTDOWN from peer, reply with RST */ | |
688 | if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) { | |
689 | (void)virtio_transport_reset(vsk, NULL); | |
690 | return true; | |
691 | } | |
692 | ||
693 | if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK) | |
694 | (void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK); | |
695 | ||
696 | if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING)) | |
697 | virtio_transport_wait_close(sk, sk->sk_lingertime); | |
698 | ||
699 | if (sock_flag(sk, SOCK_DONE)) { | |
700 | return true; | |
701 | } | |
702 | ||
703 | sock_hold(sk); | |
704 | INIT_DELAYED_WORK(&vsk->close_work, | |
705 | virtio_transport_close_timeout); | |
706 | vsk->close_work_scheduled = true; | |
707 | schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT); | |
708 | return false; | |
709 | } | |
710 | ||
711 | void virtio_transport_release(struct vsock_sock *vsk) | |
712 | { | |
713 | struct sock *sk = &vsk->sk; | |
714 | bool remove_sock = true; | |
715 | ||
716 | lock_sock(sk); | |
717 | if (sk->sk_type == SOCK_STREAM) | |
718 | remove_sock = virtio_transport_close(vsk); | |
719 | release_sock(sk); | |
720 | ||
721 | if (remove_sock) | |
722 | vsock_remove_sock(vsk); | |
723 | } | |
724 | EXPORT_SYMBOL_GPL(virtio_transport_release); | |
725 | ||
726 | static int | |
727 | virtio_transport_recv_connecting(struct sock *sk, | |
728 | struct virtio_vsock_pkt *pkt) | |
729 | { | |
730 | struct vsock_sock *vsk = vsock_sk(sk); | |
731 | int err; | |
732 | int skerr; | |
733 | ||
734 | switch (le16_to_cpu(pkt->hdr.op)) { | |
735 | case VIRTIO_VSOCK_OP_RESPONSE: | |
736 | sk->sk_state = SS_CONNECTED; | |
737 | sk->sk_socket->state = SS_CONNECTED; | |
738 | vsock_insert_connected(vsk); | |
739 | sk->sk_state_change(sk); | |
740 | break; | |
741 | case VIRTIO_VSOCK_OP_INVALID: | |
742 | break; | |
743 | case VIRTIO_VSOCK_OP_RST: | |
744 | skerr = ECONNRESET; | |
745 | err = 0; | |
746 | goto destroy; | |
747 | default: | |
748 | skerr = EPROTO; | |
749 | err = -EINVAL; | |
750 | goto destroy; | |
751 | } | |
752 | return 0; | |
753 | ||
754 | destroy: | |
755 | virtio_transport_reset(vsk, pkt); | |
756 | sk->sk_state = SS_UNCONNECTED; | |
757 | sk->sk_err = skerr; | |
758 | sk->sk_error_report(sk); | |
759 | return err; | |
760 | } | |
761 | ||
762 | static int | |
763 | virtio_transport_recv_connected(struct sock *sk, | |
764 | struct virtio_vsock_pkt *pkt) | |
765 | { | |
766 | struct vsock_sock *vsk = vsock_sk(sk); | |
767 | struct virtio_vsock_sock *vvs = vsk->trans; | |
768 | int err = 0; | |
769 | ||
770 | switch (le16_to_cpu(pkt->hdr.op)) { | |
771 | case VIRTIO_VSOCK_OP_RW: | |
772 | pkt->len = le32_to_cpu(pkt->hdr.len); | |
773 | pkt->off = 0; | |
774 | ||
775 | spin_lock_bh(&vvs->rx_lock); | |
776 | virtio_transport_inc_rx_pkt(vvs, pkt); | |
777 | list_add_tail(&pkt->list, &vvs->rx_queue); | |
778 | spin_unlock_bh(&vvs->rx_lock); | |
779 | ||
780 | sk->sk_data_ready(sk); | |
781 | return err; | |
782 | case VIRTIO_VSOCK_OP_CREDIT_UPDATE: | |
783 | sk->sk_write_space(sk); | |
784 | break; | |
785 | case VIRTIO_VSOCK_OP_SHUTDOWN: | |
786 | if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV) | |
787 | vsk->peer_shutdown |= RCV_SHUTDOWN; | |
788 | if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND) | |
789 | vsk->peer_shutdown |= SEND_SHUTDOWN; | |
790 | if (vsk->peer_shutdown == SHUTDOWN_MASK && | |
791 | vsock_stream_has_data(vsk) <= 0) | |
792 | sk->sk_state = SS_DISCONNECTING; | |
793 | if (le32_to_cpu(pkt->hdr.flags)) | |
794 | sk->sk_state_change(sk); | |
795 | break; | |
796 | case VIRTIO_VSOCK_OP_RST: | |
797 | virtio_transport_do_close(vsk, true); | |
798 | break; | |
799 | default: | |
800 | err = -EINVAL; | |
801 | break; | |
802 | } | |
803 | ||
804 | virtio_transport_free_pkt(pkt); | |
805 | return err; | |
806 | } | |
807 | ||
808 | static void | |
809 | virtio_transport_recv_disconnecting(struct sock *sk, | |
810 | struct virtio_vsock_pkt *pkt) | |
811 | { | |
812 | struct vsock_sock *vsk = vsock_sk(sk); | |
813 | ||
814 | if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) | |
815 | virtio_transport_do_close(vsk, true); | |
816 | } | |
817 | ||
818 | static int | |
819 | virtio_transport_send_response(struct vsock_sock *vsk, | |
820 | struct virtio_vsock_pkt *pkt) | |
821 | { | |
822 | struct virtio_vsock_pkt_info info = { | |
823 | .op = VIRTIO_VSOCK_OP_RESPONSE, | |
824 | .type = VIRTIO_VSOCK_TYPE_STREAM, | |
f83f12d6 | 825 | .remote_cid = le64_to_cpu(pkt->hdr.src_cid), |
06a8fc78 AH |
826 | .remote_port = le32_to_cpu(pkt->hdr.src_port), |
827 | .reply = true, | |
828 | }; | |
829 | ||
830 | return virtio_transport_send_pkt_info(vsk, &info); | |
831 | } | |
832 | ||
833 | /* Handle server socket */ | |
834 | static int | |
835 | virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt) | |
836 | { | |
837 | struct vsock_sock *vsk = vsock_sk(sk); | |
838 | struct vsock_sock *vchild; | |
839 | struct sock *child; | |
840 | ||
841 | if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) { | |
842 | virtio_transport_reset(vsk, pkt); | |
843 | return -EINVAL; | |
844 | } | |
845 | ||
846 | if (sk_acceptq_is_full(sk)) { | |
847 | virtio_transport_reset(vsk, pkt); | |
848 | return -ENOMEM; | |
849 | } | |
850 | ||
851 | child = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL, | |
852 | sk->sk_type, 0); | |
853 | if (!child) { | |
854 | virtio_transport_reset(vsk, pkt); | |
855 | return -ENOMEM; | |
856 | } | |
857 | ||
858 | sk->sk_ack_backlog++; | |
859 | ||
860 | lock_sock_nested(child, SINGLE_DEPTH_NESTING); | |
861 | ||
862 | child->sk_state = SS_CONNECTED; | |
863 | ||
864 | vchild = vsock_sk(child); | |
f83f12d6 | 865 | vsock_addr_init(&vchild->local_addr, le64_to_cpu(pkt->hdr.dst_cid), |
06a8fc78 | 866 | le32_to_cpu(pkt->hdr.dst_port)); |
f83f12d6 | 867 | vsock_addr_init(&vchild->remote_addr, le64_to_cpu(pkt->hdr.src_cid), |
06a8fc78 AH |
868 | le32_to_cpu(pkt->hdr.src_port)); |
869 | ||
870 | vsock_insert_connected(vchild); | |
871 | vsock_enqueue_accept(sk, child); | |
872 | virtio_transport_send_response(vchild, pkt); | |
873 | ||
874 | release_sock(child); | |
875 | ||
876 | sk->sk_data_ready(sk); | |
877 | return 0; | |
878 | } | |
879 | ||
880 | static bool virtio_transport_space_update(struct sock *sk, | |
881 | struct virtio_vsock_pkt *pkt) | |
882 | { | |
883 | struct vsock_sock *vsk = vsock_sk(sk); | |
884 | struct virtio_vsock_sock *vvs = vsk->trans; | |
885 | bool space_available; | |
886 | ||
887 | /* buf_alloc and fwd_cnt is always included in the hdr */ | |
888 | spin_lock_bh(&vvs->tx_lock); | |
889 | vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc); | |
890 | vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt); | |
891 | space_available = virtio_transport_has_space(vsk); | |
892 | spin_unlock_bh(&vvs->tx_lock); | |
893 | return space_available; | |
894 | } | |
895 | ||
896 | /* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex | |
897 | * lock. | |
898 | */ | |
899 | void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt) | |
900 | { | |
901 | struct sockaddr_vm src, dst; | |
902 | struct vsock_sock *vsk; | |
903 | struct sock *sk; | |
904 | bool space_available; | |
905 | ||
f83f12d6 | 906 | vsock_addr_init(&src, le64_to_cpu(pkt->hdr.src_cid), |
06a8fc78 | 907 | le32_to_cpu(pkt->hdr.src_port)); |
f83f12d6 | 908 | vsock_addr_init(&dst, le64_to_cpu(pkt->hdr.dst_cid), |
06a8fc78 AH |
909 | le32_to_cpu(pkt->hdr.dst_port)); |
910 | ||
911 | trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port, | |
912 | dst.svm_cid, dst.svm_port, | |
913 | le32_to_cpu(pkt->hdr.len), | |
914 | le16_to_cpu(pkt->hdr.type), | |
915 | le16_to_cpu(pkt->hdr.op), | |
916 | le32_to_cpu(pkt->hdr.flags), | |
917 | le32_to_cpu(pkt->hdr.buf_alloc), | |
918 | le32_to_cpu(pkt->hdr.fwd_cnt)); | |
919 | ||
920 | if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) { | |
921 | (void)virtio_transport_reset_no_sock(pkt); | |
922 | goto free_pkt; | |
923 | } | |
924 | ||
925 | /* The socket must be in connected or bound table | |
926 | * otherwise send reset back | |
927 | */ | |
928 | sk = vsock_find_connected_socket(&src, &dst); | |
929 | if (!sk) { | |
930 | sk = vsock_find_bound_socket(&dst); | |
931 | if (!sk) { | |
932 | (void)virtio_transport_reset_no_sock(pkt); | |
933 | goto free_pkt; | |
934 | } | |
935 | } | |
936 | ||
937 | vsk = vsock_sk(sk); | |
938 | ||
939 | space_available = virtio_transport_space_update(sk, pkt); | |
940 | ||
941 | lock_sock(sk); | |
942 | ||
943 | /* Update CID in case it has changed after a transport reset event */ | |
944 | vsk->local_addr.svm_cid = dst.svm_cid; | |
945 | ||
946 | if (space_available) | |
947 | sk->sk_write_space(sk); | |
948 | ||
949 | switch (sk->sk_state) { | |
950 | case VSOCK_SS_LISTEN: | |
951 | virtio_transport_recv_listen(sk, pkt); | |
952 | virtio_transport_free_pkt(pkt); | |
953 | break; | |
954 | case SS_CONNECTING: | |
955 | virtio_transport_recv_connecting(sk, pkt); | |
956 | virtio_transport_free_pkt(pkt); | |
957 | break; | |
958 | case SS_CONNECTED: | |
959 | virtio_transport_recv_connected(sk, pkt); | |
960 | break; | |
961 | case SS_DISCONNECTING: | |
962 | virtio_transport_recv_disconnecting(sk, pkt); | |
963 | virtio_transport_free_pkt(pkt); | |
964 | break; | |
965 | default: | |
966 | virtio_transport_free_pkt(pkt); | |
967 | break; | |
968 | } | |
969 | release_sock(sk); | |
970 | ||
971 | /* Release refcnt obtained when we fetched this socket out of the | |
972 | * bound or connected list. | |
973 | */ | |
974 | sock_put(sk); | |
975 | return; | |
976 | ||
977 | free_pkt: | |
978 | virtio_transport_free_pkt(pkt); | |
979 | } | |
980 | EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt); | |
981 | ||
982 | void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt) | |
983 | { | |
984 | kfree(pkt->buf); | |
985 | kfree(pkt); | |
986 | } | |
987 | EXPORT_SYMBOL_GPL(virtio_transport_free_pkt); | |
988 | ||
989 | MODULE_LICENSE("GPL v2"); | |
990 | MODULE_AUTHOR("Asias He"); | |
991 | MODULE_DESCRIPTION("common code for virtio vsock"); |