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