Commit | Line | Data |
---|---|---|
7a338472 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
06a8fc78 AH |
2 | /* |
3 | * common code for virtio vsock | |
4 | * | |
5 | * Copyright (C) 2013-2015 Red Hat, Inc. | |
6 | * Author: Asias He <asias@redhat.com> | |
7 | * Stefan Hajnoczi <stefanha@redhat.com> | |
06a8fc78 AH |
8 | */ |
9 | #include <linux/spinlock.h> | |
10 | #include <linux/module.h> | |
174cd4b1 | 11 | #include <linux/sched/signal.h> |
06a8fc78 AH |
12 | #include <linux/ctype.h> |
13 | #include <linux/list.h> | |
06a8fc78 | 14 | #include <linux/virtio_vsock.h> |
82dfb540 | 15 | #include <uapi/linux/vsockmon.h> |
06a8fc78 AH |
16 | |
17 | #include <net/sock.h> | |
18 | #include <net/af_vsock.h> | |
19 | ||
20 | #define CREATE_TRACE_POINTS | |
21 | #include <trace/events/vsock_virtio_transport_common.h> | |
22 | ||
23 | /* How long to wait for graceful shutdown of a connection */ | |
24 | #define VSOCK_CLOSE_TIMEOUT (8 * HZ) | |
25 | ||
473c7391 SG |
26 | /* Threshold for detecting small packets to copy */ |
27 | #define GOOD_COPY_LEN 128 | |
28 | ||
daabfbca SG |
29 | static const struct virtio_transport * |
30 | virtio_transport_get_ops(struct vsock_sock *vsk) | |
06a8fc78 | 31 | { |
daabfbca | 32 | const struct vsock_transport *t = vsock_core_get_transport(vsk); |
06a8fc78 | 33 | |
4aaf5961 SG |
34 | if (WARN_ON(!t)) |
35 | return NULL; | |
36 | ||
06a8fc78 AH |
37 | return container_of(t, struct virtio_transport, transport); |
38 | } | |
39 | ||
819483d8 | 40 | static struct virtio_vsock_pkt * |
06a8fc78 AH |
41 | virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info, |
42 | size_t len, | |
43 | u32 src_cid, | |
44 | u32 src_port, | |
45 | u32 dst_cid, | |
46 | u32 dst_port) | |
47 | { | |
48 | struct virtio_vsock_pkt *pkt; | |
49 | int err; | |
50 | ||
51 | pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); | |
52 | if (!pkt) | |
53 | return NULL; | |
54 | ||
55 | pkt->hdr.type = cpu_to_le16(info->type); | |
56 | pkt->hdr.op = cpu_to_le16(info->op); | |
57 | pkt->hdr.src_cid = cpu_to_le64(src_cid); | |
58 | pkt->hdr.dst_cid = cpu_to_le64(dst_cid); | |
59 | pkt->hdr.src_port = cpu_to_le32(src_port); | |
60 | pkt->hdr.dst_port = cpu_to_le32(dst_port); | |
61 | pkt->hdr.flags = cpu_to_le32(info->flags); | |
62 | pkt->len = len; | |
63 | pkt->hdr.len = cpu_to_le32(len); | |
64 | pkt->reply = info->reply; | |
36d277ba | 65 | pkt->vsk = info->vsk; |
06a8fc78 AH |
66 | |
67 | if (info->msg && len > 0) { | |
68 | pkt->buf = kmalloc(len, GFP_KERNEL); | |
69 | if (!pkt->buf) | |
70 | goto out_pkt; | |
473c7391 SG |
71 | |
72 | pkt->buf_len = len; | |
73 | ||
06a8fc78 AH |
74 | err = memcpy_from_msg(pkt->buf, info->msg, len); |
75 | if (err) | |
76 | goto out; | |
77 | } | |
78 | ||
79 | trace_virtio_transport_alloc_pkt(src_cid, src_port, | |
80 | dst_cid, dst_port, | |
81 | len, | |
82 | info->type, | |
83 | info->op, | |
84 | info->flags); | |
85 | ||
86 | return pkt; | |
87 | ||
88 | out: | |
89 | kfree(pkt->buf); | |
90 | out_pkt: | |
91 | kfree(pkt); | |
92 | return NULL; | |
93 | } | |
06a8fc78 | 94 | |
82dfb540 GG |
95 | /* Packet capture */ |
96 | static struct sk_buff *virtio_transport_build_skb(void *opaque) | |
97 | { | |
98 | struct virtio_vsock_pkt *pkt = opaque; | |
82dfb540 GG |
99 | struct af_vsockmon_hdr *hdr; |
100 | struct sk_buff *skb; | |
6dbd3e66 SG |
101 | size_t payload_len; |
102 | void *payload_buf; | |
82dfb540 | 103 | |
6dbd3e66 SG |
104 | /* A packet could be split to fit the RX buffer, so we can retrieve |
105 | * the payload length from the header and the buffer pointer taking | |
106 | * care of the offset in the original packet. | |
107 | */ | |
108 | payload_len = le32_to_cpu(pkt->hdr.len); | |
109 | payload_buf = pkt->buf + pkt->off; | |
110 | ||
111 | skb = alloc_skb(sizeof(*hdr) + sizeof(pkt->hdr) + payload_len, | |
82dfb540 GG |
112 | GFP_ATOMIC); |
113 | if (!skb) | |
114 | return NULL; | |
115 | ||
4df864c1 | 116 | hdr = skb_put(skb, sizeof(*hdr)); |
82dfb540 GG |
117 | |
118 | /* pkt->hdr is little-endian so no need to byteswap here */ | |
119 | hdr->src_cid = pkt->hdr.src_cid; | |
120 | hdr->src_port = pkt->hdr.src_port; | |
121 | hdr->dst_cid = pkt->hdr.dst_cid; | |
122 | hdr->dst_port = pkt->hdr.dst_port; | |
123 | ||
124 | hdr->transport = cpu_to_le16(AF_VSOCK_TRANSPORT_VIRTIO); | |
125 | hdr->len = cpu_to_le16(sizeof(pkt->hdr)); | |
126 | memset(hdr->reserved, 0, sizeof(hdr->reserved)); | |
127 | ||
128 | switch (le16_to_cpu(pkt->hdr.op)) { | |
129 | case VIRTIO_VSOCK_OP_REQUEST: | |
130 | case VIRTIO_VSOCK_OP_RESPONSE: | |
131 | hdr->op = cpu_to_le16(AF_VSOCK_OP_CONNECT); | |
132 | break; | |
133 | case VIRTIO_VSOCK_OP_RST: | |
134 | case VIRTIO_VSOCK_OP_SHUTDOWN: | |
135 | hdr->op = cpu_to_le16(AF_VSOCK_OP_DISCONNECT); | |
136 | break; | |
137 | case VIRTIO_VSOCK_OP_RW: | |
138 | hdr->op = cpu_to_le16(AF_VSOCK_OP_PAYLOAD); | |
139 | break; | |
140 | case VIRTIO_VSOCK_OP_CREDIT_UPDATE: | |
141 | case VIRTIO_VSOCK_OP_CREDIT_REQUEST: | |
142 | hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL); | |
143 | break; | |
144 | default: | |
145 | hdr->op = cpu_to_le16(AF_VSOCK_OP_UNKNOWN); | |
146 | break; | |
147 | } | |
148 | ||
b952f4df | 149 | skb_put_data(skb, &pkt->hdr, sizeof(pkt->hdr)); |
82dfb540 | 150 | |
6dbd3e66 SG |
151 | if (payload_len) { |
152 | skb_put_data(skb, payload_buf, payload_len); | |
82dfb540 GG |
153 | } |
154 | ||
155 | return skb; | |
156 | } | |
157 | ||
158 | void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt) | |
159 | { | |
a78d1639 SG |
160 | if (pkt->tap_delivered) |
161 | return; | |
162 | ||
82dfb540 | 163 | vsock_deliver_tap(virtio_transport_build_skb, pkt); |
a78d1639 | 164 | pkt->tap_delivered = true; |
82dfb540 GG |
165 | } |
166 | EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt); | |
167 | ||
4aaf5961 SG |
168 | /* This function can only be used on connecting/connected sockets, |
169 | * since a socket assigned to a transport is required. | |
170 | * | |
171 | * Do not use on listener sockets! | |
172 | */ | |
06a8fc78 AH |
173 | static int virtio_transport_send_pkt_info(struct vsock_sock *vsk, |
174 | struct virtio_vsock_pkt_info *info) | |
175 | { | |
176 | u32 src_cid, src_port, dst_cid, dst_port; | |
4aaf5961 | 177 | const struct virtio_transport *t_ops; |
06a8fc78 AH |
178 | struct virtio_vsock_sock *vvs; |
179 | struct virtio_vsock_pkt *pkt; | |
180 | u32 pkt_len = info->pkt_len; | |
181 | ||
b93f8877 AK |
182 | info->type = VIRTIO_VSOCK_TYPE_STREAM; |
183 | ||
4aaf5961 SG |
184 | t_ops = virtio_transport_get_ops(vsk); |
185 | if (unlikely(!t_ops)) | |
186 | return -EFAULT; | |
187 | ||
188 | src_cid = t_ops->transport.get_local_cid(); | |
06a8fc78 AH |
189 | src_port = vsk->local_addr.svm_port; |
190 | if (!info->remote_cid) { | |
191 | dst_cid = vsk->remote_addr.svm_cid; | |
192 | dst_port = vsk->remote_addr.svm_port; | |
193 | } else { | |
194 | dst_cid = info->remote_cid; | |
195 | dst_port = info->remote_port; | |
196 | } | |
197 | ||
198 | vvs = vsk->trans; | |
199 | ||
200 | /* we can send less than pkt_len bytes */ | |
0038ff35 SG |
201 | if (pkt_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) |
202 | pkt_len = VIRTIO_VSOCK_MAX_PKT_BUF_SIZE; | |
06a8fc78 AH |
203 | |
204 | /* virtio_transport_get_credit might return less than pkt_len credit */ | |
205 | pkt_len = virtio_transport_get_credit(vvs, pkt_len); | |
206 | ||
207 | /* Do not send zero length OP_RW pkt */ | |
208 | if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW) | |
209 | return pkt_len; | |
210 | ||
211 | pkt = virtio_transport_alloc_pkt(info, pkt_len, | |
212 | src_cid, src_port, | |
213 | dst_cid, dst_port); | |
214 | if (!pkt) { | |
215 | virtio_transport_put_credit(vvs, pkt_len); | |
216 | return -ENOMEM; | |
217 | } | |
218 | ||
219 | virtio_transport_inc_tx_pkt(vvs, pkt); | |
220 | ||
4aaf5961 | 221 | return t_ops->send_pkt(pkt); |
06a8fc78 AH |
222 | } |
223 | ||
ae6fcfbf | 224 | static bool virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs, |
06a8fc78 AH |
225 | struct virtio_vsock_pkt *pkt) |
226 | { | |
ae6fcfbf SG |
227 | if (vvs->rx_bytes + pkt->len > vvs->buf_alloc) |
228 | return false; | |
229 | ||
06a8fc78 | 230 | vvs->rx_bytes += pkt->len; |
ae6fcfbf | 231 | return true; |
06a8fc78 AH |
232 | } |
233 | ||
234 | static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs, | |
235 | struct virtio_vsock_pkt *pkt) | |
236 | { | |
237 | vvs->rx_bytes -= pkt->len; | |
238 | vvs->fwd_cnt += pkt->len; | |
239 | } | |
240 | ||
241 | void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt) | |
242 | { | |
9632e9f6 | 243 | spin_lock_bh(&vvs->rx_lock); |
b89d882d | 244 | vvs->last_fwd_cnt = vvs->fwd_cnt; |
06a8fc78 AH |
245 | pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt); |
246 | pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc); | |
9632e9f6 | 247 | spin_unlock_bh(&vvs->rx_lock); |
06a8fc78 AH |
248 | } |
249 | EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt); | |
250 | ||
251 | u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit) | |
252 | { | |
253 | u32 ret; | |
254 | ||
255 | spin_lock_bh(&vvs->tx_lock); | |
256 | ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); | |
257 | if (ret > credit) | |
258 | ret = credit; | |
259 | vvs->tx_cnt += ret; | |
260 | spin_unlock_bh(&vvs->tx_lock); | |
261 | ||
262 | return ret; | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(virtio_transport_get_credit); | |
265 | ||
266 | void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit) | |
267 | { | |
268 | spin_lock_bh(&vvs->tx_lock); | |
269 | vvs->tx_cnt -= credit; | |
270 | spin_unlock_bh(&vvs->tx_lock); | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(virtio_transport_put_credit); | |
273 | ||
c10844c5 | 274 | static int virtio_transport_send_credit_update(struct vsock_sock *vsk) |
06a8fc78 AH |
275 | { |
276 | struct virtio_vsock_pkt_info info = { | |
277 | .op = VIRTIO_VSOCK_OP_CREDIT_UPDATE, | |
36d277ba | 278 | .vsk = vsk, |
06a8fc78 AH |
279 | }; |
280 | ||
281 | return virtio_transport_send_pkt_info(vsk, &info); | |
282 | } | |
283 | ||
a786ab36 MEVL |
284 | static ssize_t |
285 | virtio_transport_stream_do_peek(struct vsock_sock *vsk, | |
286 | struct msghdr *msg, | |
287 | size_t len) | |
288 | { | |
289 | struct virtio_vsock_sock *vvs = vsk->trans; | |
290 | struct virtio_vsock_pkt *pkt; | |
291 | size_t bytes, total = 0, off; | |
292 | int err = -EFAULT; | |
293 | ||
294 | spin_lock_bh(&vvs->rx_lock); | |
295 | ||
296 | list_for_each_entry(pkt, &vvs->rx_queue, list) { | |
297 | off = pkt->off; | |
298 | ||
299 | if (total == len) | |
300 | break; | |
301 | ||
302 | while (total < len && off < pkt->len) { | |
303 | bytes = len - total; | |
304 | if (bytes > pkt->len - off) | |
305 | bytes = pkt->len - off; | |
306 | ||
307 | /* sk_lock is held by caller so no one else can dequeue. | |
308 | * Unlock rx_lock since memcpy_to_msg() may sleep. | |
309 | */ | |
310 | spin_unlock_bh(&vvs->rx_lock); | |
311 | ||
312 | err = memcpy_to_msg(msg, pkt->buf + off, bytes); | |
313 | if (err) | |
314 | goto out; | |
315 | ||
316 | spin_lock_bh(&vvs->rx_lock); | |
317 | ||
318 | total += bytes; | |
319 | off += bytes; | |
320 | } | |
321 | } | |
322 | ||
323 | spin_unlock_bh(&vvs->rx_lock); | |
324 | ||
325 | return total; | |
326 | ||
327 | out: | |
328 | if (total) | |
329 | err = total; | |
330 | return err; | |
331 | } | |
332 | ||
06a8fc78 AH |
333 | static ssize_t |
334 | virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, | |
335 | struct msghdr *msg, | |
336 | size_t len) | |
337 | { | |
338 | struct virtio_vsock_sock *vvs = vsk->trans; | |
339 | struct virtio_vsock_pkt *pkt; | |
340 | size_t bytes, total = 0; | |
b89d882d | 341 | u32 free_space; |
06a8fc78 AH |
342 | int err = -EFAULT; |
343 | ||
344 | spin_lock_bh(&vvs->rx_lock); | |
345 | while (total < len && !list_empty(&vvs->rx_queue)) { | |
346 | pkt = list_first_entry(&vvs->rx_queue, | |
347 | struct virtio_vsock_pkt, list); | |
348 | ||
349 | bytes = len - total; | |
350 | if (bytes > pkt->len - pkt->off) | |
351 | bytes = pkt->len - pkt->off; | |
352 | ||
353 | /* sk_lock is held by caller so no one else can dequeue. | |
354 | * Unlock rx_lock since memcpy_to_msg() may sleep. | |
355 | */ | |
356 | spin_unlock_bh(&vvs->rx_lock); | |
357 | ||
358 | err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes); | |
359 | if (err) | |
360 | goto out; | |
361 | ||
362 | spin_lock_bh(&vvs->rx_lock); | |
363 | ||
364 | total += bytes; | |
365 | pkt->off += bytes; | |
366 | if (pkt->off == pkt->len) { | |
367 | virtio_transport_dec_rx_pkt(vvs, pkt); | |
368 | list_del(&pkt->list); | |
369 | virtio_transport_free_pkt(pkt); | |
370 | } | |
371 | } | |
b89d882d SG |
372 | |
373 | free_space = vvs->buf_alloc - (vvs->fwd_cnt - vvs->last_fwd_cnt); | |
374 | ||
06a8fc78 AH |
375 | spin_unlock_bh(&vvs->rx_lock); |
376 | ||
f4d7c8e3 MT |
377 | /* To reduce the number of credit update messages, |
378 | * don't update credits as long as lots of space is available. | |
379 | * Note: the limit chosen here is arbitrary. Setting the limit | |
380 | * too high causes extra messages. Too low causes transmitter | |
381 | * stalls. As stalls are in theory more expensive than extra | |
382 | * messages, we set the limit to a high value. TODO: experiment | |
383 | * with different values. | |
b89d882d | 384 | */ |
b93f8877 | 385 | if (free_space < VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) |
c10844c5 | 386 | virtio_transport_send_credit_update(vsk); |
06a8fc78 AH |
387 | |
388 | return total; | |
389 | ||
390 | out: | |
391 | if (total) | |
392 | err = total; | |
393 | return err; | |
394 | } | |
395 | ||
396 | ssize_t | |
397 | virtio_transport_stream_dequeue(struct vsock_sock *vsk, | |
398 | struct msghdr *msg, | |
399 | size_t len, int flags) | |
400 | { | |
401 | if (flags & MSG_PEEK) | |
a786ab36 MEVL |
402 | return virtio_transport_stream_do_peek(vsk, msg, len); |
403 | else | |
404 | return virtio_transport_stream_do_dequeue(vsk, msg, len); | |
06a8fc78 AH |
405 | } |
406 | EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue); | |
407 | ||
408 | int | |
409 | virtio_transport_dgram_dequeue(struct vsock_sock *vsk, | |
410 | struct msghdr *msg, | |
411 | size_t len, int flags) | |
412 | { | |
413 | return -EOPNOTSUPP; | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue); | |
416 | ||
417 | s64 virtio_transport_stream_has_data(struct vsock_sock *vsk) | |
418 | { | |
419 | struct virtio_vsock_sock *vvs = vsk->trans; | |
420 | s64 bytes; | |
421 | ||
422 | spin_lock_bh(&vvs->rx_lock); | |
423 | bytes = vvs->rx_bytes; | |
424 | spin_unlock_bh(&vvs->rx_lock); | |
425 | ||
426 | return bytes; | |
427 | } | |
428 | EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data); | |
429 | ||
430 | static s64 virtio_transport_has_space(struct vsock_sock *vsk) | |
431 | { | |
432 | struct virtio_vsock_sock *vvs = vsk->trans; | |
433 | s64 bytes; | |
434 | ||
435 | bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); | |
436 | if (bytes < 0) | |
437 | bytes = 0; | |
438 | ||
439 | return bytes; | |
440 | } | |
441 | ||
442 | s64 virtio_transport_stream_has_space(struct vsock_sock *vsk) | |
443 | { | |
444 | struct virtio_vsock_sock *vvs = vsk->trans; | |
445 | s64 bytes; | |
446 | ||
447 | spin_lock_bh(&vvs->tx_lock); | |
448 | bytes = virtio_transport_has_space(vsk); | |
449 | spin_unlock_bh(&vvs->tx_lock); | |
450 | ||
451 | return bytes; | |
452 | } | |
453 | EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space); | |
454 | ||
455 | int virtio_transport_do_socket_init(struct vsock_sock *vsk, | |
456 | struct vsock_sock *psk) | |
457 | { | |
458 | struct virtio_vsock_sock *vvs; | |
459 | ||
460 | vvs = kzalloc(sizeof(*vvs), GFP_KERNEL); | |
461 | if (!vvs) | |
462 | return -ENOMEM; | |
463 | ||
464 | vsk->trans = vvs; | |
465 | vvs->vsk = vsk; | |
c0cfa2d8 | 466 | if (psk && psk->trans) { |
06a8fc78 AH |
467 | struct virtio_vsock_sock *ptrans = psk->trans; |
468 | ||
06a8fc78 | 469 | vvs->peer_buf_alloc = ptrans->peer_buf_alloc; |
06a8fc78 AH |
470 | } |
471 | ||
b9f2b0ff SG |
472 | if (vsk->buffer_size > VIRTIO_VSOCK_MAX_BUF_SIZE) |
473 | vsk->buffer_size = VIRTIO_VSOCK_MAX_BUF_SIZE; | |
474 | ||
475 | vvs->buf_alloc = vsk->buffer_size; | |
06a8fc78 AH |
476 | |
477 | spin_lock_init(&vvs->rx_lock); | |
478 | spin_lock_init(&vvs->tx_lock); | |
479 | INIT_LIST_HEAD(&vvs->rx_queue); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init); | |
484 | ||
b9f2b0ff SG |
485 | /* sk_lock held by the caller */ |
486 | void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val) | |
06a8fc78 AH |
487 | { |
488 | struct virtio_vsock_sock *vvs = vsk->trans; | |
489 | ||
b9f2b0ff SG |
490 | if (*val > VIRTIO_VSOCK_MAX_BUF_SIZE) |
491 | *val = VIRTIO_VSOCK_MAX_BUF_SIZE; | |
06a8fc78 | 492 | |
b9f2b0ff | 493 | vvs->buf_alloc = *val; |
ec3359b6 | 494 | |
c10844c5 | 495 | virtio_transport_send_credit_update(vsk); |
06a8fc78 | 496 | } |
b9f2b0ff | 497 | EXPORT_SYMBOL_GPL(virtio_transport_notify_buffer_size); |
06a8fc78 AH |
498 | |
499 | int | |
500 | virtio_transport_notify_poll_in(struct vsock_sock *vsk, | |
501 | size_t target, | |
502 | bool *data_ready_now) | |
503 | { | |
504 | if (vsock_stream_has_data(vsk)) | |
505 | *data_ready_now = true; | |
506 | else | |
507 | *data_ready_now = false; | |
508 | ||
509 | return 0; | |
510 | } | |
511 | EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in); | |
512 | ||
513 | int | |
514 | virtio_transport_notify_poll_out(struct vsock_sock *vsk, | |
515 | size_t target, | |
516 | bool *space_avail_now) | |
517 | { | |
518 | s64 free_space; | |
519 | ||
520 | free_space = vsock_stream_has_space(vsk); | |
521 | if (free_space > 0) | |
522 | *space_avail_now = true; | |
523 | else if (free_space == 0) | |
524 | *space_avail_now = false; | |
525 | ||
526 | return 0; | |
527 | } | |
528 | EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out); | |
529 | ||
530 | int virtio_transport_notify_recv_init(struct vsock_sock *vsk, | |
531 | size_t target, struct vsock_transport_recv_notify_data *data) | |
532 | { | |
533 | return 0; | |
534 | } | |
535 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init); | |
536 | ||
537 | int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, | |
538 | size_t target, struct vsock_transport_recv_notify_data *data) | |
539 | { | |
540 | return 0; | |
541 | } | |
542 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block); | |
543 | ||
544 | int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, | |
545 | size_t target, struct vsock_transport_recv_notify_data *data) | |
546 | { | |
547 | return 0; | |
548 | } | |
549 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue); | |
550 | ||
551 | int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, | |
552 | size_t target, ssize_t copied, bool data_read, | |
553 | struct vsock_transport_recv_notify_data *data) | |
554 | { | |
555 | return 0; | |
556 | } | |
557 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue); | |
558 | ||
559 | int virtio_transport_notify_send_init(struct vsock_sock *vsk, | |
560 | struct vsock_transport_send_notify_data *data) | |
561 | { | |
562 | return 0; | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init); | |
565 | ||
566 | int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, | |
567 | struct vsock_transport_send_notify_data *data) | |
568 | { | |
569 | return 0; | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block); | |
572 | ||
573 | int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, | |
574 | struct vsock_transport_send_notify_data *data) | |
575 | { | |
576 | return 0; | |
577 | } | |
578 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue); | |
579 | ||
580 | int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, | |
581 | ssize_t written, struct vsock_transport_send_notify_data *data) | |
582 | { | |
583 | return 0; | |
584 | } | |
585 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue); | |
586 | ||
587 | u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk) | |
588 | { | |
b9f2b0ff | 589 | return vsk->buffer_size; |
06a8fc78 AH |
590 | } |
591 | EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat); | |
592 | ||
593 | bool virtio_transport_stream_is_active(struct vsock_sock *vsk) | |
594 | { | |
595 | return true; | |
596 | } | |
597 | EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active); | |
598 | ||
599 | bool virtio_transport_stream_allow(u32 cid, u32 port) | |
600 | { | |
601 | return true; | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(virtio_transport_stream_allow); | |
604 | ||
605 | int virtio_transport_dgram_bind(struct vsock_sock *vsk, | |
606 | struct sockaddr_vm *addr) | |
607 | { | |
608 | return -EOPNOTSUPP; | |
609 | } | |
610 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind); | |
611 | ||
612 | bool virtio_transport_dgram_allow(u32 cid, u32 port) | |
613 | { | |
614 | return false; | |
615 | } | |
616 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow); | |
617 | ||
618 | int virtio_transport_connect(struct vsock_sock *vsk) | |
619 | { | |
620 | struct virtio_vsock_pkt_info info = { | |
621 | .op = VIRTIO_VSOCK_OP_REQUEST, | |
36d277ba | 622 | .vsk = vsk, |
06a8fc78 AH |
623 | }; |
624 | ||
625 | return virtio_transport_send_pkt_info(vsk, &info); | |
626 | } | |
627 | EXPORT_SYMBOL_GPL(virtio_transport_connect); | |
628 | ||
629 | int virtio_transport_shutdown(struct vsock_sock *vsk, int mode) | |
630 | { | |
631 | struct virtio_vsock_pkt_info info = { | |
632 | .op = VIRTIO_VSOCK_OP_SHUTDOWN, | |
06a8fc78 AH |
633 | .flags = (mode & RCV_SHUTDOWN ? |
634 | VIRTIO_VSOCK_SHUTDOWN_RCV : 0) | | |
635 | (mode & SEND_SHUTDOWN ? | |
636 | VIRTIO_VSOCK_SHUTDOWN_SEND : 0), | |
36d277ba | 637 | .vsk = vsk, |
06a8fc78 AH |
638 | }; |
639 | ||
640 | return virtio_transport_send_pkt_info(vsk, &info); | |
641 | } | |
642 | EXPORT_SYMBOL_GPL(virtio_transport_shutdown); | |
643 | ||
644 | int | |
645 | virtio_transport_dgram_enqueue(struct vsock_sock *vsk, | |
646 | struct sockaddr_vm *remote_addr, | |
647 | struct msghdr *msg, | |
648 | size_t dgram_len) | |
649 | { | |
650 | return -EOPNOTSUPP; | |
651 | } | |
652 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue); | |
653 | ||
654 | ssize_t | |
655 | virtio_transport_stream_enqueue(struct vsock_sock *vsk, | |
656 | struct msghdr *msg, | |
657 | size_t len) | |
658 | { | |
659 | struct virtio_vsock_pkt_info info = { | |
660 | .op = VIRTIO_VSOCK_OP_RW, | |
06a8fc78 AH |
661 | .msg = msg, |
662 | .pkt_len = len, | |
36d277ba | 663 | .vsk = vsk, |
06a8fc78 AH |
664 | }; |
665 | ||
666 | return virtio_transport_send_pkt_info(vsk, &info); | |
667 | } | |
668 | EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue); | |
669 | ||
670 | void virtio_transport_destruct(struct vsock_sock *vsk) | |
671 | { | |
672 | struct virtio_vsock_sock *vvs = vsk->trans; | |
673 | ||
674 | kfree(vvs); | |
675 | } | |
676 | EXPORT_SYMBOL_GPL(virtio_transport_destruct); | |
677 | ||
678 | static int virtio_transport_reset(struct vsock_sock *vsk, | |
679 | struct virtio_vsock_pkt *pkt) | |
680 | { | |
681 | struct virtio_vsock_pkt_info info = { | |
682 | .op = VIRTIO_VSOCK_OP_RST, | |
06a8fc78 | 683 | .reply = !!pkt, |
36d277ba | 684 | .vsk = vsk, |
06a8fc78 AH |
685 | }; |
686 | ||
687 | /* Send RST only if the original pkt is not a RST pkt */ | |
688 | if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) | |
689 | return 0; | |
690 | ||
691 | return virtio_transport_send_pkt_info(vsk, &info); | |
692 | } | |
693 | ||
694 | /* Normally packets are associated with a socket. There may be no socket if an | |
695 | * attempt was made to connect to a socket that does not exist. | |
696 | */ | |
4c7246dc SG |
697 | static int virtio_transport_reset_no_sock(const struct virtio_transport *t, |
698 | struct virtio_vsock_pkt *pkt) | |
06a8fc78 | 699 | { |
4c404ce2 | 700 | struct virtio_vsock_pkt *reply; |
06a8fc78 AH |
701 | struct virtio_vsock_pkt_info info = { |
702 | .op = VIRTIO_VSOCK_OP_RST, | |
703 | .type = le16_to_cpu(pkt->hdr.type), | |
704 | .reply = true, | |
705 | }; | |
706 | ||
707 | /* Send RST only if the original pkt is not a RST pkt */ | |
708 | if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) | |
709 | return 0; | |
710 | ||
4c404ce2 AL |
711 | reply = virtio_transport_alloc_pkt(&info, 0, |
712 | le64_to_cpu(pkt->hdr.dst_cid), | |
713 | le32_to_cpu(pkt->hdr.dst_port), | |
714 | le64_to_cpu(pkt->hdr.src_cid), | |
715 | le32_to_cpu(pkt->hdr.src_port)); | |
716 | if (!reply) | |
06a8fc78 AH |
717 | return -ENOMEM; |
718 | ||
4c404ce2 AL |
719 | if (!t) { |
720 | virtio_transport_free_pkt(reply); | |
721 | return -ENOTCONN; | |
722 | } | |
723 | ||
724 | return t->send_pkt(reply); | |
06a8fc78 AH |
725 | } |
726 | ||
8432b811 SG |
727 | /* This function should be called with sk_lock held and SOCK_DONE set */ |
728 | static void virtio_transport_remove_sock(struct vsock_sock *vsk) | |
729 | { | |
730 | struct virtio_vsock_sock *vvs = vsk->trans; | |
731 | struct virtio_vsock_pkt *pkt, *tmp; | |
732 | ||
733 | /* We don't need to take rx_lock, as the socket is closing and we are | |
734 | * removing it. | |
735 | */ | |
736 | list_for_each_entry_safe(pkt, tmp, &vvs->rx_queue, list) { | |
737 | list_del(&pkt->list); | |
738 | virtio_transport_free_pkt(pkt); | |
739 | } | |
740 | ||
741 | vsock_remove_sock(vsk); | |
742 | } | |
743 | ||
06a8fc78 AH |
744 | static void virtio_transport_wait_close(struct sock *sk, long timeout) |
745 | { | |
746 | if (timeout) { | |
d9dc8b0f WC |
747 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
748 | ||
749 | add_wait_queue(sk_sleep(sk), &wait); | |
06a8fc78 AH |
750 | |
751 | do { | |
06a8fc78 | 752 | if (sk_wait_event(sk, &timeout, |
d9dc8b0f | 753 | sock_flag(sk, SOCK_DONE), &wait)) |
06a8fc78 AH |
754 | break; |
755 | } while (!signal_pending(current) && timeout); | |
756 | ||
d9dc8b0f | 757 | remove_wait_queue(sk_sleep(sk), &wait); |
06a8fc78 AH |
758 | } |
759 | } | |
760 | ||
761 | static void virtio_transport_do_close(struct vsock_sock *vsk, | |
762 | bool cancel_timeout) | |
763 | { | |
764 | struct sock *sk = sk_vsock(vsk); | |
765 | ||
766 | sock_set_flag(sk, SOCK_DONE); | |
767 | vsk->peer_shutdown = SHUTDOWN_MASK; | |
768 | if (vsock_stream_has_data(vsk) <= 0) | |
3b4477d2 | 769 | sk->sk_state = TCP_CLOSING; |
06a8fc78 AH |
770 | sk->sk_state_change(sk); |
771 | ||
772 | if (vsk->close_work_scheduled && | |
773 | (!cancel_timeout || cancel_delayed_work(&vsk->close_work))) { | |
774 | vsk->close_work_scheduled = false; | |
775 | ||
8432b811 | 776 | virtio_transport_remove_sock(vsk); |
06a8fc78 AH |
777 | |
778 | /* Release refcnt obtained when we scheduled the timeout */ | |
779 | sock_put(sk); | |
780 | } | |
781 | } | |
782 | ||
783 | static void virtio_transport_close_timeout(struct work_struct *work) | |
784 | { | |
785 | struct vsock_sock *vsk = | |
786 | container_of(work, struct vsock_sock, close_work.work); | |
787 | struct sock *sk = sk_vsock(vsk); | |
788 | ||
789 | sock_hold(sk); | |
790 | lock_sock(sk); | |
791 | ||
792 | if (!sock_flag(sk, SOCK_DONE)) { | |
793 | (void)virtio_transport_reset(vsk, NULL); | |
794 | ||
795 | virtio_transport_do_close(vsk, false); | |
796 | } | |
797 | ||
798 | vsk->close_work_scheduled = false; | |
799 | ||
800 | release_sock(sk); | |
801 | sock_put(sk); | |
802 | } | |
803 | ||
804 | /* User context, vsk->sk is locked */ | |
805 | static bool virtio_transport_close(struct vsock_sock *vsk) | |
806 | { | |
807 | struct sock *sk = &vsk->sk; | |
808 | ||
3b4477d2 SH |
809 | if (!(sk->sk_state == TCP_ESTABLISHED || |
810 | sk->sk_state == TCP_CLOSING)) | |
06a8fc78 AH |
811 | return true; |
812 | ||
813 | /* Already received SHUTDOWN from peer, reply with RST */ | |
814 | if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) { | |
815 | (void)virtio_transport_reset(vsk, NULL); | |
816 | return true; | |
817 | } | |
818 | ||
819 | if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK) | |
820 | (void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK); | |
821 | ||
822 | if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING)) | |
823 | virtio_transport_wait_close(sk, sk->sk_lingertime); | |
824 | ||
825 | if (sock_flag(sk, SOCK_DONE)) { | |
826 | return true; | |
827 | } | |
828 | ||
829 | sock_hold(sk); | |
830 | INIT_DELAYED_WORK(&vsk->close_work, | |
831 | virtio_transport_close_timeout); | |
832 | vsk->close_work_scheduled = true; | |
833 | schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT); | |
834 | return false; | |
835 | } | |
836 | ||
837 | void virtio_transport_release(struct vsock_sock *vsk) | |
838 | { | |
839 | struct sock *sk = &vsk->sk; | |
840 | bool remove_sock = true; | |
841 | ||
06a8fc78 AH |
842 | if (sk->sk_type == SOCK_STREAM) |
843 | remove_sock = virtio_transport_close(vsk); | |
ac03046e | 844 | |
3fe356d5 SG |
845 | if (remove_sock) { |
846 | sock_set_flag(sk, SOCK_DONE); | |
8432b811 | 847 | virtio_transport_remove_sock(vsk); |
3fe356d5 | 848 | } |
06a8fc78 AH |
849 | } |
850 | EXPORT_SYMBOL_GPL(virtio_transport_release); | |
851 | ||
852 | static int | |
853 | virtio_transport_recv_connecting(struct sock *sk, | |
854 | struct virtio_vsock_pkt *pkt) | |
855 | { | |
856 | struct vsock_sock *vsk = vsock_sk(sk); | |
857 | int err; | |
858 | int skerr; | |
859 | ||
860 | switch (le16_to_cpu(pkt->hdr.op)) { | |
861 | case VIRTIO_VSOCK_OP_RESPONSE: | |
3b4477d2 | 862 | sk->sk_state = TCP_ESTABLISHED; |
06a8fc78 AH |
863 | sk->sk_socket->state = SS_CONNECTED; |
864 | vsock_insert_connected(vsk); | |
865 | sk->sk_state_change(sk); | |
866 | break; | |
867 | case VIRTIO_VSOCK_OP_INVALID: | |
868 | break; | |
869 | case VIRTIO_VSOCK_OP_RST: | |
870 | skerr = ECONNRESET; | |
871 | err = 0; | |
872 | goto destroy; | |
873 | default: | |
874 | skerr = EPROTO; | |
875 | err = -EINVAL; | |
876 | goto destroy; | |
877 | } | |
878 | return 0; | |
879 | ||
880 | destroy: | |
881 | virtio_transport_reset(vsk, pkt); | |
3b4477d2 | 882 | sk->sk_state = TCP_CLOSE; |
06a8fc78 AH |
883 | sk->sk_err = skerr; |
884 | sk->sk_error_report(sk); | |
885 | return err; | |
886 | } | |
887 | ||
473c7391 SG |
888 | static void |
889 | virtio_transport_recv_enqueue(struct vsock_sock *vsk, | |
890 | struct virtio_vsock_pkt *pkt) | |
891 | { | |
892 | struct virtio_vsock_sock *vvs = vsk->trans; | |
ae6fcfbf | 893 | bool can_enqueue, free_pkt = false; |
473c7391 SG |
894 | |
895 | pkt->len = le32_to_cpu(pkt->hdr.len); | |
896 | pkt->off = 0; | |
897 | ||
898 | spin_lock_bh(&vvs->rx_lock); | |
899 | ||
ae6fcfbf SG |
900 | can_enqueue = virtio_transport_inc_rx_pkt(vvs, pkt); |
901 | if (!can_enqueue) { | |
902 | free_pkt = true; | |
903 | goto out; | |
904 | } | |
473c7391 SG |
905 | |
906 | /* Try to copy small packets into the buffer of last packet queued, | |
907 | * to avoid wasting memory queueing the entire buffer with a small | |
908 | * payload. | |
909 | */ | |
910 | if (pkt->len <= GOOD_COPY_LEN && !list_empty(&vvs->rx_queue)) { | |
911 | struct virtio_vsock_pkt *last_pkt; | |
912 | ||
913 | last_pkt = list_last_entry(&vvs->rx_queue, | |
914 | struct virtio_vsock_pkt, list); | |
915 | ||
916 | /* If there is space in the last packet queued, we copy the | |
917 | * new packet in its buffer. | |
918 | */ | |
919 | if (pkt->len <= last_pkt->buf_len - last_pkt->len) { | |
920 | memcpy(last_pkt->buf + last_pkt->len, pkt->buf, | |
921 | pkt->len); | |
922 | last_pkt->len += pkt->len; | |
923 | free_pkt = true; | |
924 | goto out; | |
925 | } | |
926 | } | |
927 | ||
928 | list_add_tail(&pkt->list, &vvs->rx_queue); | |
929 | ||
930 | out: | |
931 | spin_unlock_bh(&vvs->rx_lock); | |
932 | if (free_pkt) | |
933 | virtio_transport_free_pkt(pkt); | |
934 | } | |
935 | ||
06a8fc78 AH |
936 | static int |
937 | virtio_transport_recv_connected(struct sock *sk, | |
938 | struct virtio_vsock_pkt *pkt) | |
939 | { | |
940 | struct vsock_sock *vsk = vsock_sk(sk); | |
06a8fc78 AH |
941 | int err = 0; |
942 | ||
943 | switch (le16_to_cpu(pkt->hdr.op)) { | |
944 | case VIRTIO_VSOCK_OP_RW: | |
473c7391 | 945 | virtio_transport_recv_enqueue(vsk, pkt); |
06a8fc78 AH |
946 | sk->sk_data_ready(sk); |
947 | return err; | |
948 | case VIRTIO_VSOCK_OP_CREDIT_UPDATE: | |
949 | sk->sk_write_space(sk); | |
950 | break; | |
951 | case VIRTIO_VSOCK_OP_SHUTDOWN: | |
952 | if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV) | |
953 | vsk->peer_shutdown |= RCV_SHUTDOWN; | |
954 | if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND) | |
955 | vsk->peer_shutdown |= SEND_SHUTDOWN; | |
956 | if (vsk->peer_shutdown == SHUTDOWN_MASK && | |
ad8a7220 SG |
957 | vsock_stream_has_data(vsk) <= 0 && |
958 | !sock_flag(sk, SOCK_DONE)) { | |
959 | (void)virtio_transport_reset(vsk, NULL); | |
960 | ||
961 | virtio_transport_do_close(vsk, true); | |
42f5cda5 | 962 | } |
06a8fc78 AH |
963 | if (le32_to_cpu(pkt->hdr.flags)) |
964 | sk->sk_state_change(sk); | |
965 | break; | |
966 | case VIRTIO_VSOCK_OP_RST: | |
967 | virtio_transport_do_close(vsk, true); | |
968 | break; | |
969 | default: | |
970 | err = -EINVAL; | |
971 | break; | |
972 | } | |
973 | ||
974 | virtio_transport_free_pkt(pkt); | |
975 | return err; | |
976 | } | |
977 | ||
978 | static void | |
979 | virtio_transport_recv_disconnecting(struct sock *sk, | |
980 | struct virtio_vsock_pkt *pkt) | |
981 | { | |
982 | struct vsock_sock *vsk = vsock_sk(sk); | |
983 | ||
984 | if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) | |
985 | virtio_transport_do_close(vsk, true); | |
986 | } | |
987 | ||
988 | static int | |
989 | virtio_transport_send_response(struct vsock_sock *vsk, | |
990 | struct virtio_vsock_pkt *pkt) | |
991 | { | |
992 | struct virtio_vsock_pkt_info info = { | |
993 | .op = VIRTIO_VSOCK_OP_RESPONSE, | |
f83f12d6 | 994 | .remote_cid = le64_to_cpu(pkt->hdr.src_cid), |
06a8fc78 AH |
995 | .remote_port = le32_to_cpu(pkt->hdr.src_port), |
996 | .reply = true, | |
36d277ba | 997 | .vsk = vsk, |
06a8fc78 AH |
998 | }; |
999 | ||
1000 | return virtio_transport_send_pkt_info(vsk, &info); | |
1001 | } | |
1002 | ||
c0cfa2d8 SG |
1003 | static bool virtio_transport_space_update(struct sock *sk, |
1004 | struct virtio_vsock_pkt *pkt) | |
1005 | { | |
1006 | struct vsock_sock *vsk = vsock_sk(sk); | |
1007 | struct virtio_vsock_sock *vvs = vsk->trans; | |
1008 | bool space_available; | |
1009 | ||
1010 | /* Listener sockets are not associated with any transport, so we are | |
1011 | * not able to take the state to see if there is space available in the | |
1012 | * remote peer, but since they are only used to receive requests, we | |
1013 | * can assume that there is always space available in the other peer. | |
1014 | */ | |
1015 | if (!vvs) | |
1016 | return true; | |
1017 | ||
1018 | /* buf_alloc and fwd_cnt is always included in the hdr */ | |
1019 | spin_lock_bh(&vvs->tx_lock); | |
1020 | vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc); | |
1021 | vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt); | |
1022 | space_available = virtio_transport_has_space(vsk); | |
1023 | spin_unlock_bh(&vvs->tx_lock); | |
1024 | return space_available; | |
1025 | } | |
1026 | ||
06a8fc78 AH |
1027 | /* Handle server socket */ |
1028 | static int | |
c0cfa2d8 SG |
1029 | virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt, |
1030 | struct virtio_transport *t) | |
06a8fc78 AH |
1031 | { |
1032 | struct vsock_sock *vsk = vsock_sk(sk); | |
1033 | struct vsock_sock *vchild; | |
1034 | struct sock *child; | |
c0cfa2d8 | 1035 | int ret; |
06a8fc78 AH |
1036 | |
1037 | if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) { | |
df18fa14 | 1038 | virtio_transport_reset_no_sock(t, pkt); |
06a8fc78 AH |
1039 | return -EINVAL; |
1040 | } | |
1041 | ||
1042 | if (sk_acceptq_is_full(sk)) { | |
df18fa14 | 1043 | virtio_transport_reset_no_sock(t, pkt); |
06a8fc78 AH |
1044 | return -ENOMEM; |
1045 | } | |
1046 | ||
b9ca2f5f | 1047 | child = vsock_create_connected(sk); |
06a8fc78 | 1048 | if (!child) { |
df18fa14 | 1049 | virtio_transport_reset_no_sock(t, pkt); |
06a8fc78 AH |
1050 | return -ENOMEM; |
1051 | } | |
1052 | ||
7976a11b | 1053 | sk_acceptq_added(sk); |
06a8fc78 AH |
1054 | |
1055 | lock_sock_nested(child, SINGLE_DEPTH_NESTING); | |
1056 | ||
3b4477d2 | 1057 | child->sk_state = TCP_ESTABLISHED; |
06a8fc78 AH |
1058 | |
1059 | vchild = vsock_sk(child); | |
f83f12d6 | 1060 | vsock_addr_init(&vchild->local_addr, le64_to_cpu(pkt->hdr.dst_cid), |
06a8fc78 | 1061 | le32_to_cpu(pkt->hdr.dst_port)); |
f83f12d6 | 1062 | vsock_addr_init(&vchild->remote_addr, le64_to_cpu(pkt->hdr.src_cid), |
06a8fc78 AH |
1063 | le32_to_cpu(pkt->hdr.src_port)); |
1064 | ||
c0cfa2d8 SG |
1065 | ret = vsock_assign_transport(vchild, vsk); |
1066 | /* Transport assigned (looking at remote_addr) must be the same | |
1067 | * where we received the request. | |
1068 | */ | |
1069 | if (ret || vchild->transport != &t->transport) { | |
1070 | release_sock(child); | |
df18fa14 | 1071 | virtio_transport_reset_no_sock(t, pkt); |
c0cfa2d8 SG |
1072 | sock_put(child); |
1073 | return ret; | |
1074 | } | |
1075 | ||
1076 | if (virtio_transport_space_update(child, pkt)) | |
1077 | child->sk_write_space(child); | |
1078 | ||
06a8fc78 AH |
1079 | vsock_insert_connected(vchild); |
1080 | vsock_enqueue_accept(sk, child); | |
1081 | virtio_transport_send_response(vchild, pkt); | |
1082 | ||
1083 | release_sock(child); | |
1084 | ||
1085 | sk->sk_data_ready(sk); | |
1086 | return 0; | |
1087 | } | |
1088 | ||
06a8fc78 AH |
1089 | /* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex |
1090 | * lock. | |
1091 | */ | |
4c7246dc SG |
1092 | void virtio_transport_recv_pkt(struct virtio_transport *t, |
1093 | struct virtio_vsock_pkt *pkt) | |
06a8fc78 AH |
1094 | { |
1095 | struct sockaddr_vm src, dst; | |
1096 | struct vsock_sock *vsk; | |
1097 | struct sock *sk; | |
1098 | bool space_available; | |
1099 | ||
f83f12d6 | 1100 | vsock_addr_init(&src, le64_to_cpu(pkt->hdr.src_cid), |
06a8fc78 | 1101 | le32_to_cpu(pkt->hdr.src_port)); |
f83f12d6 | 1102 | vsock_addr_init(&dst, le64_to_cpu(pkt->hdr.dst_cid), |
06a8fc78 AH |
1103 | le32_to_cpu(pkt->hdr.dst_port)); |
1104 | ||
1105 | trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port, | |
1106 | dst.svm_cid, dst.svm_port, | |
1107 | le32_to_cpu(pkt->hdr.len), | |
1108 | le16_to_cpu(pkt->hdr.type), | |
1109 | le16_to_cpu(pkt->hdr.op), | |
1110 | le32_to_cpu(pkt->hdr.flags), | |
1111 | le32_to_cpu(pkt->hdr.buf_alloc), | |
1112 | le32_to_cpu(pkt->hdr.fwd_cnt)); | |
1113 | ||
1114 | if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) { | |
4c7246dc | 1115 | (void)virtio_transport_reset_no_sock(t, pkt); |
06a8fc78 AH |
1116 | goto free_pkt; |
1117 | } | |
1118 | ||
1119 | /* The socket must be in connected or bound table | |
1120 | * otherwise send reset back | |
1121 | */ | |
1122 | sk = vsock_find_connected_socket(&src, &dst); | |
1123 | if (!sk) { | |
1124 | sk = vsock_find_bound_socket(&dst); | |
1125 | if (!sk) { | |
4c7246dc | 1126 | (void)virtio_transport_reset_no_sock(t, pkt); |
06a8fc78 AH |
1127 | goto free_pkt; |
1128 | } | |
1129 | } | |
1130 | ||
1131 | vsk = vsock_sk(sk); | |
1132 | ||
06a8fc78 AH |
1133 | lock_sock(sk); |
1134 | ||
3fe356d5 SG |
1135 | /* Check if sk has been closed before lock_sock */ |
1136 | if (sock_flag(sk, SOCK_DONE)) { | |
8692cefc JH |
1137 | (void)virtio_transport_reset_no_sock(t, pkt); |
1138 | release_sock(sk); | |
1139 | sock_put(sk); | |
1140 | goto free_pkt; | |
1141 | } | |
1142 | ||
ce7536bc SG |
1143 | space_available = virtio_transport_space_update(sk, pkt); |
1144 | ||
06a8fc78 AH |
1145 | /* Update CID in case it has changed after a transport reset event */ |
1146 | vsk->local_addr.svm_cid = dst.svm_cid; | |
1147 | ||
1148 | if (space_available) | |
1149 | sk->sk_write_space(sk); | |
1150 | ||
1151 | switch (sk->sk_state) { | |
3b4477d2 | 1152 | case TCP_LISTEN: |
c0cfa2d8 | 1153 | virtio_transport_recv_listen(sk, pkt, t); |
06a8fc78 AH |
1154 | virtio_transport_free_pkt(pkt); |
1155 | break; | |
3b4477d2 | 1156 | case TCP_SYN_SENT: |
06a8fc78 AH |
1157 | virtio_transport_recv_connecting(sk, pkt); |
1158 | virtio_transport_free_pkt(pkt); | |
1159 | break; | |
3b4477d2 | 1160 | case TCP_ESTABLISHED: |
06a8fc78 AH |
1161 | virtio_transport_recv_connected(sk, pkt); |
1162 | break; | |
3b4477d2 | 1163 | case TCP_CLOSING: |
06a8fc78 AH |
1164 | virtio_transport_recv_disconnecting(sk, pkt); |
1165 | virtio_transport_free_pkt(pkt); | |
1166 | break; | |
1167 | default: | |
df12eb6d | 1168 | (void)virtio_transport_reset_no_sock(t, pkt); |
06a8fc78 AH |
1169 | virtio_transport_free_pkt(pkt); |
1170 | break; | |
1171 | } | |
c0cfa2d8 | 1172 | |
06a8fc78 AH |
1173 | release_sock(sk); |
1174 | ||
1175 | /* Release refcnt obtained when we fetched this socket out of the | |
1176 | * bound or connected list. | |
1177 | */ | |
1178 | sock_put(sk); | |
1179 | return; | |
1180 | ||
1181 | free_pkt: | |
1182 | virtio_transport_free_pkt(pkt); | |
1183 | } | |
1184 | EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt); | |
1185 | ||
1186 | void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt) | |
1187 | { | |
1188 | kfree(pkt->buf); | |
1189 | kfree(pkt); | |
1190 | } | |
1191 | EXPORT_SYMBOL_GPL(virtio_transport_free_pkt); | |
1192 | ||
1193 | MODULE_LICENSE("GPL v2"); | |
1194 | MODULE_AUTHOR("Asias He"); | |
1195 | MODULE_DESCRIPTION("common code for virtio vsock"); |