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685a6bf8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d021c344 AK |
2 | /* |
3 | * VMware vSockets Driver | |
4 | * | |
5 | * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. | |
d021c344 AK |
6 | */ |
7 | ||
8 | #include <linux/types.h> | |
d021c344 AK |
9 | #include <linux/bitops.h> |
10 | #include <linux/cred.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/kmod.h> | |
15 | #include <linux/list.h> | |
d021c344 AK |
16 | #include <linux/module.h> |
17 | #include <linux/mutex.h> | |
18 | #include <linux/net.h> | |
19 | #include <linux/poll.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/smp.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/unistd.h> | |
25 | #include <linux/wait.h> | |
26 | #include <linux/workqueue.h> | |
27 | #include <net/sock.h> | |
82a54d0e | 28 | #include <net/af_vsock.h> |
d021c344 | 29 | |
d021c344 AK |
30 | #include "vmci_transport_notify.h" |
31 | ||
32 | static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg); | |
33 | static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg); | |
d021c344 AK |
34 | static void vmci_transport_peer_detach_cb(u32 sub_id, |
35 | const struct vmci_event_data *ed, | |
36 | void *client_data); | |
37 | static void vmci_transport_recv_pkt_work(struct work_struct *work); | |
4ef7ea91 | 38 | static void vmci_transport_cleanup(struct work_struct *work); |
d021c344 AK |
39 | static int vmci_transport_recv_listen(struct sock *sk, |
40 | struct vmci_transport_packet *pkt); | |
41 | static int vmci_transport_recv_connecting_server( | |
42 | struct sock *sk, | |
43 | struct sock *pending, | |
44 | struct vmci_transport_packet *pkt); | |
45 | static int vmci_transport_recv_connecting_client( | |
46 | struct sock *sk, | |
47 | struct vmci_transport_packet *pkt); | |
48 | static int vmci_transport_recv_connecting_client_negotiate( | |
49 | struct sock *sk, | |
50 | struct vmci_transport_packet *pkt); | |
51 | static int vmci_transport_recv_connecting_client_invalid( | |
52 | struct sock *sk, | |
53 | struct vmci_transport_packet *pkt); | |
54 | static int vmci_transport_recv_connected(struct sock *sk, | |
55 | struct vmci_transport_packet *pkt); | |
56 | static bool vmci_transport_old_proto_override(bool *old_pkt_proto); | |
57 | static u16 vmci_transport_new_proto_supported_versions(void); | |
58 | static bool vmci_transport_proto_to_notify_struct(struct sock *sk, u16 *proto, | |
59 | bool old_pkt_proto); | |
60 | ||
61 | struct vmci_transport_recv_pkt_info { | |
62 | struct work_struct work; | |
63 | struct sock *sk; | |
64 | struct vmci_transport_packet pkt; | |
65 | }; | |
66 | ||
4ef7ea91 JH |
67 | static LIST_HEAD(vmci_transport_cleanup_list); |
68 | static DEFINE_SPINLOCK(vmci_transport_cleanup_lock); | |
69 | static DECLARE_WORK(vmci_transport_cleanup_work, vmci_transport_cleanup); | |
70 | ||
d021c344 AK |
71 | static struct vmci_handle vmci_transport_stream_handle = { VMCI_INVALID_ID, |
72 | VMCI_INVALID_ID }; | |
73 | static u32 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; | |
74 | ||
75 | static int PROTOCOL_OVERRIDE = -1; | |
76 | ||
77 | #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN 128 | |
78 | #define VMCI_TRANSPORT_DEFAULT_QP_SIZE 262144 | |
79 | #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX 262144 | |
80 | ||
81 | /* The default peer timeout indicates how long we will wait for a peer response | |
82 | * to a control message. | |
83 | */ | |
84 | #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) | |
85 | ||
d021c344 AK |
86 | /* Helper function to convert from a VMCI error code to a VSock error code. */ |
87 | ||
88 | static s32 vmci_transport_error_to_vsock_error(s32 vmci_error) | |
89 | { | |
d021c344 AK |
90 | switch (vmci_error) { |
91 | case VMCI_ERROR_NO_MEM: | |
ed8bfd5c | 92 | return -ENOMEM; |
d021c344 AK |
93 | case VMCI_ERROR_DUPLICATE_ENTRY: |
94 | case VMCI_ERROR_ALREADY_EXISTS: | |
ed8bfd5c | 95 | return -EADDRINUSE; |
d021c344 | 96 | case VMCI_ERROR_NO_ACCESS: |
ed8bfd5c | 97 | return -EPERM; |
d021c344 | 98 | case VMCI_ERROR_NO_RESOURCES: |
ed8bfd5c | 99 | return -ENOBUFS; |
d021c344 | 100 | case VMCI_ERROR_INVALID_RESOURCE: |
ed8bfd5c | 101 | return -EHOSTUNREACH; |
d021c344 AK |
102 | case VMCI_ERROR_INVALID_ARGS: |
103 | default: | |
ed8bfd5c | 104 | break; |
d021c344 | 105 | } |
ed8bfd5c | 106 | return -EINVAL; |
d021c344 AK |
107 | } |
108 | ||
2a89f924 RG |
109 | static u32 vmci_transport_peer_rid(u32 peer_cid) |
110 | { | |
111 | if (VMADDR_CID_HYPERVISOR == peer_cid) | |
112 | return VMCI_TRANSPORT_HYPERVISOR_PACKET_RID; | |
113 | ||
114 | return VMCI_TRANSPORT_PACKET_RID; | |
115 | } | |
116 | ||
d021c344 AK |
117 | static inline void |
118 | vmci_transport_packet_init(struct vmci_transport_packet *pkt, | |
119 | struct sockaddr_vm *src, | |
120 | struct sockaddr_vm *dst, | |
121 | u8 type, | |
122 | u64 size, | |
123 | u64 mode, | |
124 | struct vmci_transport_waiting_info *wait, | |
125 | u16 proto, | |
126 | struct vmci_handle handle) | |
127 | { | |
128 | /* We register the stream control handler as an any cid handle so we | |
129 | * must always send from a source address of VMADDR_CID_ANY | |
130 | */ | |
131 | pkt->dg.src = vmci_make_handle(VMADDR_CID_ANY, | |
132 | VMCI_TRANSPORT_PACKET_RID); | |
133 | pkt->dg.dst = vmci_make_handle(dst->svm_cid, | |
2a89f924 | 134 | vmci_transport_peer_rid(dst->svm_cid)); |
d021c344 AK |
135 | pkt->dg.payload_size = sizeof(*pkt) - sizeof(pkt->dg); |
136 | pkt->version = VMCI_TRANSPORT_PACKET_VERSION; | |
137 | pkt->type = type; | |
138 | pkt->src_port = src->svm_port; | |
139 | pkt->dst_port = dst->svm_port; | |
140 | memset(&pkt->proto, 0, sizeof(pkt->proto)); | |
141 | memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2)); | |
142 | ||
143 | switch (pkt->type) { | |
144 | case VMCI_TRANSPORT_PACKET_TYPE_INVALID: | |
145 | pkt->u.size = 0; | |
146 | break; | |
147 | ||
148 | case VMCI_TRANSPORT_PACKET_TYPE_REQUEST: | |
149 | case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: | |
150 | pkt->u.size = size; | |
151 | break; | |
152 | ||
153 | case VMCI_TRANSPORT_PACKET_TYPE_OFFER: | |
154 | case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: | |
155 | pkt->u.handle = handle; | |
156 | break; | |
157 | ||
158 | case VMCI_TRANSPORT_PACKET_TYPE_WROTE: | |
159 | case VMCI_TRANSPORT_PACKET_TYPE_READ: | |
160 | case VMCI_TRANSPORT_PACKET_TYPE_RST: | |
161 | pkt->u.size = 0; | |
162 | break; | |
163 | ||
164 | case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: | |
165 | pkt->u.mode = mode; | |
166 | break; | |
167 | ||
168 | case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ: | |
169 | case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE: | |
170 | memcpy(&pkt->u.wait, wait, sizeof(pkt->u.wait)); | |
171 | break; | |
172 | ||
173 | case VMCI_TRANSPORT_PACKET_TYPE_REQUEST2: | |
174 | case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: | |
175 | pkt->u.size = size; | |
176 | pkt->proto = proto; | |
177 | break; | |
178 | } | |
179 | } | |
180 | ||
181 | static inline void | |
182 | vmci_transport_packet_get_addresses(struct vmci_transport_packet *pkt, | |
183 | struct sockaddr_vm *local, | |
184 | struct sockaddr_vm *remote) | |
185 | { | |
186 | vsock_addr_init(local, pkt->dg.dst.context, pkt->dst_port); | |
187 | vsock_addr_init(remote, pkt->dg.src.context, pkt->src_port); | |
188 | } | |
189 | ||
190 | static int | |
191 | __vmci_transport_send_control_pkt(struct vmci_transport_packet *pkt, | |
192 | struct sockaddr_vm *src, | |
193 | struct sockaddr_vm *dst, | |
194 | enum vmci_transport_packet_type type, | |
195 | u64 size, | |
196 | u64 mode, | |
197 | struct vmci_transport_waiting_info *wait, | |
198 | u16 proto, | |
199 | struct vmci_handle handle, | |
200 | bool convert_error) | |
201 | { | |
202 | int err; | |
203 | ||
204 | vmci_transport_packet_init(pkt, src, dst, type, size, mode, wait, | |
205 | proto, handle); | |
206 | err = vmci_datagram_send(&pkt->dg); | |
207 | if (convert_error && (err < 0)) | |
208 | return vmci_transport_error_to_vsock_error(err); | |
209 | ||
210 | return err; | |
211 | } | |
212 | ||
213 | static int | |
214 | vmci_transport_reply_control_pkt_fast(struct vmci_transport_packet *pkt, | |
215 | enum vmci_transport_packet_type type, | |
216 | u64 size, | |
217 | u64 mode, | |
218 | struct vmci_transport_waiting_info *wait, | |
219 | struct vmci_handle handle) | |
220 | { | |
221 | struct vmci_transport_packet reply; | |
222 | struct sockaddr_vm src, dst; | |
223 | ||
224 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) { | |
225 | return 0; | |
226 | } else { | |
227 | vmci_transport_packet_get_addresses(pkt, &src, &dst); | |
228 | return __vmci_transport_send_control_pkt(&reply, &src, &dst, | |
229 | type, | |
230 | size, mode, wait, | |
231 | VSOCK_PROTO_INVALID, | |
232 | handle, true); | |
233 | } | |
234 | } | |
235 | ||
236 | static int | |
237 | vmci_transport_send_control_pkt_bh(struct sockaddr_vm *src, | |
238 | struct sockaddr_vm *dst, | |
239 | enum vmci_transport_packet_type type, | |
240 | u64 size, | |
241 | u64 mode, | |
242 | struct vmci_transport_waiting_info *wait, | |
243 | struct vmci_handle handle) | |
244 | { | |
245 | /* Note that it is safe to use a single packet across all CPUs since | |
246 | * two tasklets of the same type are guaranteed to not ever run | |
247 | * simultaneously. If that ever changes, or VMCI stops using tasklets, | |
248 | * we can use per-cpu packets. | |
249 | */ | |
250 | static struct vmci_transport_packet pkt; | |
251 | ||
252 | return __vmci_transport_send_control_pkt(&pkt, src, dst, type, | |
253 | size, mode, wait, | |
254 | VSOCK_PROTO_INVALID, handle, | |
255 | false); | |
256 | } | |
257 | ||
a915b982 JH |
258 | static int |
259 | vmci_transport_alloc_send_control_pkt(struct sockaddr_vm *src, | |
260 | struct sockaddr_vm *dst, | |
261 | enum vmci_transport_packet_type type, | |
262 | u64 size, | |
263 | u64 mode, | |
264 | struct vmci_transport_waiting_info *wait, | |
265 | u16 proto, | |
266 | struct vmci_handle handle) | |
267 | { | |
268 | struct vmci_transport_packet *pkt; | |
269 | int err; | |
270 | ||
271 | pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); | |
272 | if (!pkt) | |
273 | return -ENOMEM; | |
274 | ||
275 | err = __vmci_transport_send_control_pkt(pkt, src, dst, type, size, | |
276 | mode, wait, proto, handle, | |
277 | true); | |
278 | kfree(pkt); | |
279 | ||
280 | return err; | |
281 | } | |
282 | ||
d021c344 AK |
283 | static int |
284 | vmci_transport_send_control_pkt(struct sock *sk, | |
285 | enum vmci_transport_packet_type type, | |
286 | u64 size, | |
287 | u64 mode, | |
288 | struct vmci_transport_waiting_info *wait, | |
289 | u16 proto, | |
290 | struct vmci_handle handle) | |
291 | { | |
d021c344 | 292 | struct vsock_sock *vsk; |
d021c344 AK |
293 | |
294 | vsk = vsock_sk(sk); | |
295 | ||
296 | if (!vsock_addr_bound(&vsk->local_addr)) | |
297 | return -EINVAL; | |
298 | ||
299 | if (!vsock_addr_bound(&vsk->remote_addr)) | |
300 | return -EINVAL; | |
301 | ||
a915b982 JH |
302 | return vmci_transport_alloc_send_control_pkt(&vsk->local_addr, |
303 | &vsk->remote_addr, | |
304 | type, size, mode, | |
305 | wait, proto, handle); | |
d021c344 AK |
306 | } |
307 | ||
308 | static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst, | |
309 | struct sockaddr_vm *src, | |
310 | struct vmci_transport_packet *pkt) | |
311 | { | |
312 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) | |
313 | return 0; | |
314 | return vmci_transport_send_control_pkt_bh( | |
315 | dst, src, | |
316 | VMCI_TRANSPORT_PACKET_TYPE_RST, 0, | |
317 | 0, NULL, VMCI_INVALID_HANDLE); | |
318 | } | |
319 | ||
320 | static int vmci_transport_send_reset(struct sock *sk, | |
321 | struct vmci_transport_packet *pkt) | |
322 | { | |
a915b982 JH |
323 | struct sockaddr_vm *dst_ptr; |
324 | struct sockaddr_vm dst; | |
325 | struct vsock_sock *vsk; | |
326 | ||
d021c344 AK |
327 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) |
328 | return 0; | |
a915b982 JH |
329 | |
330 | vsk = vsock_sk(sk); | |
331 | ||
332 | if (!vsock_addr_bound(&vsk->local_addr)) | |
333 | return -EINVAL; | |
334 | ||
335 | if (vsock_addr_bound(&vsk->remote_addr)) { | |
336 | dst_ptr = &vsk->remote_addr; | |
337 | } else { | |
338 | vsock_addr_init(&dst, pkt->dg.src.context, | |
339 | pkt->src_port); | |
340 | dst_ptr = &dst; | |
341 | } | |
342 | return vmci_transport_alloc_send_control_pkt(&vsk->local_addr, dst_ptr, | |
343 | VMCI_TRANSPORT_PACKET_TYPE_RST, | |
344 | 0, 0, NULL, VSOCK_PROTO_INVALID, | |
345 | VMCI_INVALID_HANDLE); | |
d021c344 AK |
346 | } |
347 | ||
348 | static int vmci_transport_send_negotiate(struct sock *sk, size_t size) | |
349 | { | |
350 | return vmci_transport_send_control_pkt( | |
351 | sk, | |
352 | VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE, | |
353 | size, 0, NULL, | |
354 | VSOCK_PROTO_INVALID, | |
355 | VMCI_INVALID_HANDLE); | |
356 | } | |
357 | ||
358 | static int vmci_transport_send_negotiate2(struct sock *sk, size_t size, | |
359 | u16 version) | |
360 | { | |
361 | return vmci_transport_send_control_pkt( | |
362 | sk, | |
363 | VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2, | |
364 | size, 0, NULL, version, | |
365 | VMCI_INVALID_HANDLE); | |
366 | } | |
367 | ||
368 | static int vmci_transport_send_qp_offer(struct sock *sk, | |
369 | struct vmci_handle handle) | |
370 | { | |
371 | return vmci_transport_send_control_pkt( | |
372 | sk, VMCI_TRANSPORT_PACKET_TYPE_OFFER, 0, | |
373 | 0, NULL, | |
374 | VSOCK_PROTO_INVALID, handle); | |
375 | } | |
376 | ||
377 | static int vmci_transport_send_attach(struct sock *sk, | |
378 | struct vmci_handle handle) | |
379 | { | |
380 | return vmci_transport_send_control_pkt( | |
381 | sk, VMCI_TRANSPORT_PACKET_TYPE_ATTACH, | |
382 | 0, 0, NULL, VSOCK_PROTO_INVALID, | |
383 | handle); | |
384 | } | |
385 | ||
386 | static int vmci_transport_reply_reset(struct vmci_transport_packet *pkt) | |
387 | { | |
388 | return vmci_transport_reply_control_pkt_fast( | |
389 | pkt, | |
390 | VMCI_TRANSPORT_PACKET_TYPE_RST, | |
391 | 0, 0, NULL, | |
392 | VMCI_INVALID_HANDLE); | |
393 | } | |
394 | ||
395 | static int vmci_transport_send_invalid_bh(struct sockaddr_vm *dst, | |
396 | struct sockaddr_vm *src) | |
397 | { | |
398 | return vmci_transport_send_control_pkt_bh( | |
399 | dst, src, | |
400 | VMCI_TRANSPORT_PACKET_TYPE_INVALID, | |
401 | 0, 0, NULL, VMCI_INVALID_HANDLE); | |
402 | } | |
403 | ||
404 | int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst, | |
405 | struct sockaddr_vm *src) | |
406 | { | |
407 | return vmci_transport_send_control_pkt_bh( | |
408 | dst, src, | |
409 | VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, | |
410 | 0, NULL, VMCI_INVALID_HANDLE); | |
411 | } | |
412 | ||
413 | int vmci_transport_send_read_bh(struct sockaddr_vm *dst, | |
414 | struct sockaddr_vm *src) | |
415 | { | |
416 | return vmci_transport_send_control_pkt_bh( | |
417 | dst, src, | |
418 | VMCI_TRANSPORT_PACKET_TYPE_READ, 0, | |
419 | 0, NULL, VMCI_INVALID_HANDLE); | |
420 | } | |
421 | ||
422 | int vmci_transport_send_wrote(struct sock *sk) | |
423 | { | |
424 | return vmci_transport_send_control_pkt( | |
425 | sk, VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, | |
426 | 0, NULL, VSOCK_PROTO_INVALID, | |
427 | VMCI_INVALID_HANDLE); | |
428 | } | |
429 | ||
430 | int vmci_transport_send_read(struct sock *sk) | |
431 | { | |
432 | return vmci_transport_send_control_pkt( | |
433 | sk, VMCI_TRANSPORT_PACKET_TYPE_READ, 0, | |
434 | 0, NULL, VSOCK_PROTO_INVALID, | |
435 | VMCI_INVALID_HANDLE); | |
436 | } | |
437 | ||
438 | int vmci_transport_send_waiting_write(struct sock *sk, | |
439 | struct vmci_transport_waiting_info *wait) | |
440 | { | |
441 | return vmci_transport_send_control_pkt( | |
442 | sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE, | |
443 | 0, 0, wait, VSOCK_PROTO_INVALID, | |
444 | VMCI_INVALID_HANDLE); | |
445 | } | |
446 | ||
447 | int vmci_transport_send_waiting_read(struct sock *sk, | |
448 | struct vmci_transport_waiting_info *wait) | |
449 | { | |
450 | return vmci_transport_send_control_pkt( | |
451 | sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ, | |
452 | 0, 0, wait, VSOCK_PROTO_INVALID, | |
453 | VMCI_INVALID_HANDLE); | |
454 | } | |
455 | ||
456 | static int vmci_transport_shutdown(struct vsock_sock *vsk, int mode) | |
457 | { | |
458 | return vmci_transport_send_control_pkt( | |
459 | &vsk->sk, | |
460 | VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN, | |
461 | 0, mode, NULL, | |
462 | VSOCK_PROTO_INVALID, | |
463 | VMCI_INVALID_HANDLE); | |
464 | } | |
465 | ||
466 | static int vmci_transport_send_conn_request(struct sock *sk, size_t size) | |
467 | { | |
468 | return vmci_transport_send_control_pkt(sk, | |
469 | VMCI_TRANSPORT_PACKET_TYPE_REQUEST, | |
470 | size, 0, NULL, | |
471 | VSOCK_PROTO_INVALID, | |
472 | VMCI_INVALID_HANDLE); | |
473 | } | |
474 | ||
475 | static int vmci_transport_send_conn_request2(struct sock *sk, size_t size, | |
476 | u16 version) | |
477 | { | |
478 | return vmci_transport_send_control_pkt( | |
479 | sk, VMCI_TRANSPORT_PACKET_TYPE_REQUEST2, | |
480 | size, 0, NULL, version, | |
481 | VMCI_INVALID_HANDLE); | |
482 | } | |
483 | ||
484 | static struct sock *vmci_transport_get_pending( | |
485 | struct sock *listener, | |
486 | struct vmci_transport_packet *pkt) | |
487 | { | |
488 | struct vsock_sock *vlistener; | |
489 | struct vsock_sock *vpending; | |
490 | struct sock *pending; | |
990454b5 RG |
491 | struct sockaddr_vm src; |
492 | ||
493 | vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); | |
d021c344 AK |
494 | |
495 | vlistener = vsock_sk(listener); | |
496 | ||
497 | list_for_each_entry(vpending, &vlistener->pending_links, | |
498 | pending_links) { | |
d021c344 | 499 | if (vsock_addr_equals_addr(&src, &vpending->remote_addr) && |
990454b5 | 500 | pkt->dst_port == vpending->local_addr.svm_port) { |
d021c344 AK |
501 | pending = sk_vsock(vpending); |
502 | sock_hold(pending); | |
503 | goto found; | |
504 | } | |
505 | } | |
506 | ||
507 | pending = NULL; | |
508 | found: | |
509 | return pending; | |
510 | ||
511 | } | |
512 | ||
513 | static void vmci_transport_release_pending(struct sock *pending) | |
514 | { | |
515 | sock_put(pending); | |
516 | } | |
517 | ||
518 | /* We allow two kinds of sockets to communicate with a restricted VM: 1) | |
519 | * trusted sockets 2) sockets from applications running as the same user as the | |
520 | * VM (this is only true for the host side and only when using hosted products) | |
521 | */ | |
522 | ||
523 | static bool vmci_transport_is_trusted(struct vsock_sock *vsock, u32 peer_cid) | |
524 | { | |
525 | return vsock->trusted || | |
526 | vmci_is_context_owner(peer_cid, vsock->owner->uid); | |
527 | } | |
528 | ||
529 | /* We allow sending datagrams to and receiving datagrams from a restricted VM | |
530 | * only if it is trusted as described in vmci_transport_is_trusted. | |
531 | */ | |
532 | ||
533 | static bool vmci_transport_allow_dgram(struct vsock_sock *vsock, u32 peer_cid) | |
534 | { | |
2a89f924 RG |
535 | if (VMADDR_CID_HYPERVISOR == peer_cid) |
536 | return true; | |
537 | ||
d021c344 AK |
538 | if (vsock->cached_peer != peer_cid) { |
539 | vsock->cached_peer = peer_cid; | |
540 | if (!vmci_transport_is_trusted(vsock, peer_cid) && | |
541 | (vmci_context_get_priv_flags(peer_cid) & | |
542 | VMCI_PRIVILEGE_FLAG_RESTRICTED)) { | |
543 | vsock->cached_peer_allow_dgram = false; | |
544 | } else { | |
545 | vsock->cached_peer_allow_dgram = true; | |
546 | } | |
547 | } | |
548 | ||
549 | return vsock->cached_peer_allow_dgram; | |
550 | } | |
551 | ||
552 | static int | |
553 | vmci_transport_queue_pair_alloc(struct vmci_qp **qpair, | |
554 | struct vmci_handle *handle, | |
555 | u64 produce_size, | |
556 | u64 consume_size, | |
557 | u32 peer, u32 flags, bool trusted) | |
558 | { | |
559 | int err = 0; | |
560 | ||
561 | if (trusted) { | |
562 | /* Try to allocate our queue pair as trusted. This will only | |
563 | * work if vsock is running in the host. | |
564 | */ | |
565 | ||
566 | err = vmci_qpair_alloc(qpair, handle, produce_size, | |
567 | consume_size, | |
568 | peer, flags, | |
569 | VMCI_PRIVILEGE_FLAG_TRUSTED); | |
570 | if (err != VMCI_ERROR_NO_ACCESS) | |
571 | goto out; | |
572 | ||
573 | } | |
574 | ||
575 | err = vmci_qpair_alloc(qpair, handle, produce_size, consume_size, | |
576 | peer, flags, VMCI_NO_PRIVILEGE_FLAGS); | |
577 | out: | |
578 | if (err < 0) { | |
579 | pr_err("Could not attach to queue pair with %d\n", | |
580 | err); | |
581 | err = vmci_transport_error_to_vsock_error(err); | |
582 | } | |
583 | ||
584 | return err; | |
585 | } | |
586 | ||
587 | static int | |
588 | vmci_transport_datagram_create_hnd(u32 resource_id, | |
589 | u32 flags, | |
590 | vmci_datagram_recv_cb recv_cb, | |
591 | void *client_data, | |
592 | struct vmci_handle *out_handle) | |
593 | { | |
594 | int err = 0; | |
595 | ||
596 | /* Try to allocate our datagram handler as trusted. This will only work | |
597 | * if vsock is running in the host. | |
598 | */ | |
599 | ||
600 | err = vmci_datagram_create_handle_priv(resource_id, flags, | |
601 | VMCI_PRIVILEGE_FLAG_TRUSTED, | |
602 | recv_cb, | |
603 | client_data, out_handle); | |
604 | ||
605 | if (err == VMCI_ERROR_NO_ACCESS) | |
606 | err = vmci_datagram_create_handle(resource_id, flags, | |
607 | recv_cb, client_data, | |
608 | out_handle); | |
609 | ||
610 | return err; | |
611 | } | |
612 | ||
613 | /* This is invoked as part of a tasklet that's scheduled when the VMCI | |
614 | * interrupt fires. This is run in bottom-half context and if it ever needs to | |
615 | * sleep it should defer that work to a work queue. | |
616 | */ | |
617 | ||
618 | static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg) | |
619 | { | |
620 | struct sock *sk; | |
621 | size_t size; | |
622 | struct sk_buff *skb; | |
623 | struct vsock_sock *vsk; | |
624 | ||
625 | sk = (struct sock *)data; | |
626 | ||
627 | /* This handler is privileged when this module is running on the host. | |
628 | * We will get datagrams from all endpoints (even VMs that are in a | |
629 | * restricted context). If we get one from a restricted context then | |
630 | * the destination socket must be trusted. | |
631 | * | |
632 | * NOTE: We access the socket struct without holding the lock here. | |
633 | * This is ok because the field we are interested is never modified | |
634 | * outside of the create and destruct socket functions. | |
635 | */ | |
636 | vsk = vsock_sk(sk); | |
637 | if (!vmci_transport_allow_dgram(vsk, dg->src.context)) | |
638 | return VMCI_ERROR_NO_ACCESS; | |
639 | ||
640 | size = VMCI_DG_SIZE(dg); | |
641 | ||
642 | /* Attach the packet to the socket's receive queue as an sk_buff. */ | |
643 | skb = alloc_skb(size, GFP_ATOMIC); | |
dce1a287 AH |
644 | if (!skb) |
645 | return VMCI_ERROR_NO_MEM; | |
646 | ||
647 | /* sk_receive_skb() will do a sock_put(), so hold here. */ | |
648 | sock_hold(sk); | |
649 | skb_put(skb, size); | |
650 | memcpy(skb->data, dg, size); | |
651 | sk_receive_skb(sk, skb, 0); | |
d021c344 AK |
652 | |
653 | return VMCI_SUCCESS; | |
654 | } | |
655 | ||
656 | static bool vmci_transport_stream_allow(u32 cid, u32 port) | |
657 | { | |
658 | static const u32 non_socket_contexts[] = { | |
d021c344 AK |
659 | VMADDR_CID_RESERVED, |
660 | }; | |
661 | int i; | |
662 | ||
663 | BUILD_BUG_ON(sizeof(cid) != sizeof(*non_socket_contexts)); | |
664 | ||
665 | for (i = 0; i < ARRAY_SIZE(non_socket_contexts); i++) { | |
666 | if (cid == non_socket_contexts[i]) | |
667 | return false; | |
668 | } | |
669 | ||
670 | return true; | |
671 | } | |
672 | ||
673 | /* This is invoked as part of a tasklet that's scheduled when the VMCI | |
674 | * interrupt fires. This is run in bottom-half context but it defers most of | |
675 | * its work to the packet handling work queue. | |
676 | */ | |
677 | ||
678 | static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg) | |
679 | { | |
680 | struct sock *sk; | |
681 | struct sockaddr_vm dst; | |
682 | struct sockaddr_vm src; | |
683 | struct vmci_transport_packet *pkt; | |
684 | struct vsock_sock *vsk; | |
685 | bool bh_process_pkt; | |
686 | int err; | |
687 | ||
688 | sk = NULL; | |
689 | err = VMCI_SUCCESS; | |
690 | bh_process_pkt = false; | |
691 | ||
692 | /* Ignore incoming packets from contexts without sockets, or resources | |
693 | * that aren't vsock implementations. | |
694 | */ | |
695 | ||
696 | if (!vmci_transport_stream_allow(dg->src.context, -1) | |
2a89f924 | 697 | || vmci_transport_peer_rid(dg->src.context) != dg->src.resource) |
d021c344 AK |
698 | return VMCI_ERROR_NO_ACCESS; |
699 | ||
700 | if (VMCI_DG_SIZE(dg) < sizeof(*pkt)) | |
701 | /* Drop datagrams that do not contain full VSock packets. */ | |
702 | return VMCI_ERROR_INVALID_ARGS; | |
703 | ||
704 | pkt = (struct vmci_transport_packet *)dg; | |
705 | ||
706 | /* Find the socket that should handle this packet. First we look for a | |
707 | * connected socket and if there is none we look for a socket bound to | |
708 | * the destintation address. | |
709 | */ | |
710 | vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); | |
711 | vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port); | |
712 | ||
713 | sk = vsock_find_connected_socket(&src, &dst); | |
714 | if (!sk) { | |
715 | sk = vsock_find_bound_socket(&dst); | |
716 | if (!sk) { | |
717 | /* We could not find a socket for this specified | |
718 | * address. If this packet is a RST, we just drop it. | |
719 | * If it is another packet, we send a RST. Note that | |
720 | * we do not send a RST reply to RSTs so that we do not | |
721 | * continually send RSTs between two endpoints. | |
722 | * | |
723 | * Note that since this is a reply, dst is src and src | |
724 | * is dst. | |
725 | */ | |
726 | if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) | |
727 | pr_err("unable to send reset\n"); | |
728 | ||
729 | err = VMCI_ERROR_NOT_FOUND; | |
730 | goto out; | |
731 | } | |
732 | } | |
733 | ||
734 | /* If the received packet type is beyond all types known to this | |
735 | * implementation, reply with an invalid message. Hopefully this will | |
736 | * help when implementing backwards compatibility in the future. | |
737 | */ | |
738 | if (pkt->type >= VMCI_TRANSPORT_PACKET_TYPE_MAX) { | |
739 | vmci_transport_send_invalid_bh(&dst, &src); | |
740 | err = VMCI_ERROR_INVALID_ARGS; | |
741 | goto out; | |
742 | } | |
743 | ||
744 | /* This handler is privileged when this module is running on the host. | |
745 | * We will get datagram connect requests from all endpoints (even VMs | |
746 | * that are in a restricted context). If we get one from a restricted | |
747 | * context then the destination socket must be trusted. | |
748 | * | |
749 | * NOTE: We access the socket struct without holding the lock here. | |
750 | * This is ok because the field we are interested is never modified | |
751 | * outside of the create and destruct socket functions. | |
752 | */ | |
753 | vsk = vsock_sk(sk); | |
754 | if (!vmci_transport_allow_dgram(vsk, pkt->dg.src.context)) { | |
755 | err = VMCI_ERROR_NO_ACCESS; | |
756 | goto out; | |
757 | } | |
758 | ||
759 | /* We do most everything in a work queue, but let's fast path the | |
760 | * notification of reads and writes to help data transfer performance. | |
761 | * We can only do this if there is no process context code executing | |
762 | * for this socket since that may change the state. | |
763 | */ | |
764 | bh_lock_sock(sk); | |
765 | ||
990454b5 RG |
766 | if (!sock_owned_by_user(sk)) { |
767 | /* The local context ID may be out of date, update it. */ | |
768 | vsk->local_addr.svm_cid = dst.svm_cid; | |
769 | ||
3b4477d2 | 770 | if (sk->sk_state == TCP_ESTABLISHED) |
990454b5 RG |
771 | vmci_trans(vsk)->notify_ops->handle_notify_pkt( |
772 | sk, pkt, true, &dst, &src, | |
773 | &bh_process_pkt); | |
774 | } | |
d021c344 AK |
775 | |
776 | bh_unlock_sock(sk); | |
777 | ||
778 | if (!bh_process_pkt) { | |
779 | struct vmci_transport_recv_pkt_info *recv_pkt_info; | |
780 | ||
781 | recv_pkt_info = kmalloc(sizeof(*recv_pkt_info), GFP_ATOMIC); | |
782 | if (!recv_pkt_info) { | |
783 | if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) | |
784 | pr_err("unable to send reset\n"); | |
785 | ||
786 | err = VMCI_ERROR_NO_MEM; | |
787 | goto out; | |
788 | } | |
789 | ||
790 | recv_pkt_info->sk = sk; | |
791 | memcpy(&recv_pkt_info->pkt, pkt, sizeof(recv_pkt_info->pkt)); | |
792 | INIT_WORK(&recv_pkt_info->work, vmci_transport_recv_pkt_work); | |
793 | ||
794 | schedule_work(&recv_pkt_info->work); | |
795 | /* Clear sk so that the reference count incremented by one of | |
796 | * the Find functions above is not decremented below. We need | |
797 | * that reference count for the packet handler we've scheduled | |
798 | * to run. | |
799 | */ | |
800 | sk = NULL; | |
801 | } | |
802 | ||
803 | out: | |
804 | if (sk) | |
805 | sock_put(sk); | |
806 | ||
807 | return err; | |
808 | } | |
809 | ||
d021c344 AK |
810 | static void vmci_transport_handle_detach(struct sock *sk) |
811 | { | |
812 | struct vsock_sock *vsk; | |
813 | ||
814 | vsk = vsock_sk(sk); | |
815 | if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) { | |
816 | sock_set_flag(sk, SOCK_DONE); | |
817 | ||
818 | /* On a detach the peer will not be sending or receiving | |
819 | * anymore. | |
820 | */ | |
821 | vsk->peer_shutdown = SHUTDOWN_MASK; | |
822 | ||
823 | /* We should not be sending anymore since the peer won't be | |
824 | * there to receive, but we can still receive if there is data | |
afbea2cd JH |
825 | * left in our consume queue. If the local endpoint is a host, |
826 | * we can't call vsock_stream_has_data, since that may block, | |
827 | * but a host endpoint can't read data once the VM has | |
828 | * detached, so there is no available data in that case. | |
d021c344 | 829 | */ |
afbea2cd JH |
830 | if (vsk->local_addr.svm_cid == VMADDR_CID_HOST || |
831 | vsock_stream_has_data(vsk) <= 0) { | |
3b4477d2 | 832 | if (sk->sk_state == TCP_SYN_SENT) { |
d021c344 AK |
833 | /* The peer may detach from a queue pair while |
834 | * we are still in the connecting state, i.e., | |
835 | * if the peer VM is killed after attaching to | |
836 | * a queue pair, but before we complete the | |
837 | * handshake. In that case, we treat the detach | |
838 | * event like a reset. | |
839 | */ | |
840 | ||
4a5def7f | 841 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
842 | sk->sk_err = ECONNRESET; |
843 | sk->sk_error_report(sk); | |
844 | return; | |
845 | } | |
4a5def7f | 846 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
847 | } |
848 | sk->sk_state_change(sk); | |
849 | } | |
850 | } | |
851 | ||
852 | static void vmci_transport_peer_detach_cb(u32 sub_id, | |
853 | const struct vmci_event_data *e_data, | |
854 | void *client_data) | |
855 | { | |
4ef7ea91 | 856 | struct vmci_transport *trans = client_data; |
d021c344 | 857 | const struct vmci_event_payload_qp *e_payload; |
d021c344 AK |
858 | |
859 | e_payload = vmci_event_data_const_payload(e_data); | |
d021c344 AK |
860 | |
861 | /* XXX This is lame, we should provide a way to lookup sockets by | |
862 | * qp_handle. | |
863 | */ | |
4ef7ea91 | 864 | if (vmci_handle_is_invalid(e_payload->handle) || |
8ab18d71 | 865 | !vmci_handle_is_equal(trans->qp_handle, e_payload->handle)) |
4ef7ea91 | 866 | return; |
d021c344 | 867 | |
4ef7ea91 JH |
868 | /* We don't ask for delayed CBs when we subscribe to this event (we |
869 | * pass 0 as flags to vmci_event_subscribe()). VMCI makes no | |
870 | * guarantees in that case about what context we might be running in, | |
871 | * so it could be BH or process, blockable or non-blockable. So we | |
872 | * need to account for all possible contexts here. | |
873 | */ | |
874 | spin_lock_bh(&trans->lock); | |
875 | if (!trans->sk) | |
876 | goto out; | |
877 | ||
878 | /* Apart from here, trans->lock is only grabbed as part of sk destruct, | |
879 | * where trans->sk isn't locked. | |
880 | */ | |
881 | bh_lock_sock(trans->sk); | |
882 | ||
883 | vmci_transport_handle_detach(trans->sk); | |
884 | ||
885 | bh_unlock_sock(trans->sk); | |
886 | out: | |
887 | spin_unlock_bh(&trans->lock); | |
d021c344 AK |
888 | } |
889 | ||
890 | static void vmci_transport_qp_resumed_cb(u32 sub_id, | |
891 | const struct vmci_event_data *e_data, | |
892 | void *client_data) | |
893 | { | |
894 | vsock_for_each_connected_socket(vmci_transport_handle_detach); | |
895 | } | |
896 | ||
897 | static void vmci_transport_recv_pkt_work(struct work_struct *work) | |
898 | { | |
899 | struct vmci_transport_recv_pkt_info *recv_pkt_info; | |
900 | struct vmci_transport_packet *pkt; | |
901 | struct sock *sk; | |
902 | ||
903 | recv_pkt_info = | |
904 | container_of(work, struct vmci_transport_recv_pkt_info, work); | |
905 | sk = recv_pkt_info->sk; | |
906 | pkt = &recv_pkt_info->pkt; | |
907 | ||
908 | lock_sock(sk); | |
909 | ||
990454b5 RG |
910 | /* The local context ID may be out of date. */ |
911 | vsock_sk(sk)->local_addr.svm_cid = pkt->dg.dst.context; | |
912 | ||
d021c344 | 913 | switch (sk->sk_state) { |
3b4477d2 | 914 | case TCP_LISTEN: |
d021c344 AK |
915 | vmci_transport_recv_listen(sk, pkt); |
916 | break; | |
3b4477d2 | 917 | case TCP_SYN_SENT: |
d021c344 AK |
918 | /* Processing of pending connections for servers goes through |
919 | * the listening socket, so see vmci_transport_recv_listen() | |
920 | * for that path. | |
921 | */ | |
922 | vmci_transport_recv_connecting_client(sk, pkt); | |
923 | break; | |
3b4477d2 | 924 | case TCP_ESTABLISHED: |
d021c344 AK |
925 | vmci_transport_recv_connected(sk, pkt); |
926 | break; | |
927 | default: | |
928 | /* Because this function does not run in the same context as | |
929 | * vmci_transport_recv_stream_cb it is possible that the | |
930 | * socket has closed. We need to let the other side know or it | |
931 | * could be sitting in a connect and hang forever. Send a | |
932 | * reset to prevent that. | |
933 | */ | |
934 | vmci_transport_send_reset(sk, pkt); | |
0fc93246 | 935 | break; |
d021c344 AK |
936 | } |
937 | ||
d021c344 AK |
938 | release_sock(sk); |
939 | kfree(recv_pkt_info); | |
940 | /* Release reference obtained in the stream callback when we fetched | |
941 | * this socket out of the bound or connected list. | |
942 | */ | |
943 | sock_put(sk); | |
944 | } | |
945 | ||
946 | static int vmci_transport_recv_listen(struct sock *sk, | |
947 | struct vmci_transport_packet *pkt) | |
948 | { | |
949 | struct sock *pending; | |
950 | struct vsock_sock *vpending; | |
951 | int err; | |
952 | u64 qp_size; | |
953 | bool old_request = false; | |
954 | bool old_pkt_proto = false; | |
955 | ||
956 | err = 0; | |
957 | ||
958 | /* Because we are in the listen state, we could be receiving a packet | |
959 | * for ourself or any previous connection requests that we received. | |
960 | * If it's the latter, we try to find a socket in our list of pending | |
961 | * connections and, if we do, call the appropriate handler for the | |
962 | * state that that socket is in. Otherwise we try to service the | |
963 | * connection request. | |
964 | */ | |
965 | pending = vmci_transport_get_pending(sk, pkt); | |
966 | if (pending) { | |
967 | lock_sock(pending); | |
990454b5 RG |
968 | |
969 | /* The local context ID may be out of date. */ | |
970 | vsock_sk(pending)->local_addr.svm_cid = pkt->dg.dst.context; | |
971 | ||
d021c344 | 972 | switch (pending->sk_state) { |
3b4477d2 | 973 | case TCP_SYN_SENT: |
d021c344 AK |
974 | err = vmci_transport_recv_connecting_server(sk, |
975 | pending, | |
976 | pkt); | |
977 | break; | |
978 | default: | |
979 | vmci_transport_send_reset(pending, pkt); | |
980 | err = -EINVAL; | |
981 | } | |
982 | ||
983 | if (err < 0) | |
984 | vsock_remove_pending(sk, pending); | |
985 | ||
986 | release_sock(pending); | |
987 | vmci_transport_release_pending(pending); | |
988 | ||
989 | return err; | |
990 | } | |
991 | ||
992 | /* The listen state only accepts connection requests. Reply with a | |
993 | * reset unless we received a reset. | |
994 | */ | |
995 | ||
996 | if (!(pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST || | |
997 | pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)) { | |
998 | vmci_transport_reply_reset(pkt); | |
999 | return -EINVAL; | |
1000 | } | |
1001 | ||
1002 | if (pkt->u.size == 0) { | |
1003 | vmci_transport_reply_reset(pkt); | |
1004 | return -EINVAL; | |
1005 | } | |
1006 | ||
1007 | /* If this socket can't accommodate this connection request, we send a | |
1008 | * reset. Otherwise we create and initialize a child socket and reply | |
1009 | * with a connection negotiation. | |
1010 | */ | |
1011 | if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) { | |
1012 | vmci_transport_reply_reset(pkt); | |
1013 | return -ECONNREFUSED; | |
1014 | } | |
1015 | ||
1016 | pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL, | |
11aa9c28 | 1017 | sk->sk_type, 0); |
d021c344 AK |
1018 | if (!pending) { |
1019 | vmci_transport_send_reset(sk, pkt); | |
1020 | return -ENOMEM; | |
1021 | } | |
1022 | ||
1023 | vpending = vsock_sk(pending); | |
1024 | ||
1025 | vsock_addr_init(&vpending->local_addr, pkt->dg.dst.context, | |
1026 | pkt->dst_port); | |
1027 | vsock_addr_init(&vpending->remote_addr, pkt->dg.src.context, | |
1028 | pkt->src_port); | |
1029 | ||
1030 | /* If the proposed size fits within our min/max, accept it. Otherwise | |
1031 | * propose our own size. | |
1032 | */ | |
1033 | if (pkt->u.size >= vmci_trans(vpending)->queue_pair_min_size && | |
1034 | pkt->u.size <= vmci_trans(vpending)->queue_pair_max_size) { | |
1035 | qp_size = pkt->u.size; | |
1036 | } else { | |
1037 | qp_size = vmci_trans(vpending)->queue_pair_size; | |
1038 | } | |
1039 | ||
1040 | /* Figure out if we are using old or new requests based on the | |
1041 | * overrides pkt types sent by our peer. | |
1042 | */ | |
1043 | if (vmci_transport_old_proto_override(&old_pkt_proto)) { | |
1044 | old_request = old_pkt_proto; | |
1045 | } else { | |
1046 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST) | |
1047 | old_request = true; | |
1048 | else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2) | |
1049 | old_request = false; | |
1050 | ||
1051 | } | |
1052 | ||
1053 | if (old_request) { | |
1054 | /* Handle a REQUEST (or override) */ | |
1055 | u16 version = VSOCK_PROTO_INVALID; | |
1056 | if (vmci_transport_proto_to_notify_struct( | |
1057 | pending, &version, true)) | |
1058 | err = vmci_transport_send_negotiate(pending, qp_size); | |
1059 | else | |
1060 | err = -EINVAL; | |
1061 | ||
1062 | } else { | |
1063 | /* Handle a REQUEST2 (or override) */ | |
1064 | int proto_int = pkt->proto; | |
1065 | int pos; | |
1066 | u16 active_proto_version = 0; | |
1067 | ||
1068 | /* The list of possible protocols is the intersection of all | |
1069 | * protocols the client supports ... plus all the protocols we | |
1070 | * support. | |
1071 | */ | |
1072 | proto_int &= vmci_transport_new_proto_supported_versions(); | |
1073 | ||
1074 | /* We choose the highest possible protocol version and use that | |
1075 | * one. | |
1076 | */ | |
1077 | pos = fls(proto_int); | |
1078 | if (pos) { | |
1079 | active_proto_version = (1 << (pos - 1)); | |
1080 | if (vmci_transport_proto_to_notify_struct( | |
1081 | pending, &active_proto_version, false)) | |
1082 | err = vmci_transport_send_negotiate2(pending, | |
1083 | qp_size, | |
1084 | active_proto_version); | |
1085 | else | |
1086 | err = -EINVAL; | |
1087 | ||
1088 | } else { | |
1089 | err = -EINVAL; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | if (err < 0) { | |
1094 | vmci_transport_send_reset(sk, pkt); | |
1095 | sock_put(pending); | |
1096 | err = vmci_transport_error_to_vsock_error(err); | |
1097 | goto out; | |
1098 | } | |
1099 | ||
1100 | vsock_add_pending(sk, pending); | |
1101 | sk->sk_ack_backlog++; | |
1102 | ||
3b4477d2 | 1103 | pending->sk_state = TCP_SYN_SENT; |
d021c344 AK |
1104 | vmci_trans(vpending)->produce_size = |
1105 | vmci_trans(vpending)->consume_size = qp_size; | |
1106 | vmci_trans(vpending)->queue_pair_size = qp_size; | |
1107 | ||
1108 | vmci_trans(vpending)->notify_ops->process_request(pending); | |
1109 | ||
1110 | /* We might never receive another message for this socket and it's not | |
1111 | * connected to any process, so we have to ensure it gets cleaned up | |
1112 | * ourself. Our delayed work function will take care of that. Note | |
1113 | * that we do not ever cancel this function since we have few | |
1114 | * guarantees about its state when calling cancel_delayed_work(). | |
1115 | * Instead we hold a reference on the socket for that function and make | |
1116 | * it capable of handling cases where it needs to do nothing but | |
1117 | * release that reference. | |
1118 | */ | |
1119 | vpending->listener = sk; | |
1120 | sock_hold(sk); | |
1121 | sock_hold(pending); | |
455f05ec | 1122 | schedule_delayed_work(&vpending->pending_work, HZ); |
d021c344 AK |
1123 | |
1124 | out: | |
1125 | return err; | |
1126 | } | |
1127 | ||
1128 | static int | |
1129 | vmci_transport_recv_connecting_server(struct sock *listener, | |
1130 | struct sock *pending, | |
1131 | struct vmci_transport_packet *pkt) | |
1132 | { | |
1133 | struct vsock_sock *vpending; | |
1134 | struct vmci_handle handle; | |
1135 | struct vmci_qp *qpair; | |
1136 | bool is_local; | |
1137 | u32 flags; | |
1138 | u32 detach_sub_id; | |
1139 | int err; | |
1140 | int skerr; | |
1141 | ||
1142 | vpending = vsock_sk(pending); | |
1143 | detach_sub_id = VMCI_INVALID_ID; | |
1144 | ||
1145 | switch (pkt->type) { | |
1146 | case VMCI_TRANSPORT_PACKET_TYPE_OFFER: | |
1147 | if (vmci_handle_is_invalid(pkt->u.handle)) { | |
1148 | vmci_transport_send_reset(pending, pkt); | |
1149 | skerr = EPROTO; | |
1150 | err = -EINVAL; | |
1151 | goto destroy; | |
1152 | } | |
1153 | break; | |
1154 | default: | |
1155 | /* Close and cleanup the connection. */ | |
1156 | vmci_transport_send_reset(pending, pkt); | |
1157 | skerr = EPROTO; | |
1158 | err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; | |
1159 | goto destroy; | |
1160 | } | |
1161 | ||
1162 | /* In order to complete the connection we need to attach to the offered | |
1163 | * queue pair and send an attach notification. We also subscribe to the | |
1164 | * detach event so we know when our peer goes away, and we do that | |
1165 | * before attaching so we don't miss an event. If all this succeeds, | |
1166 | * we update our state and wakeup anything waiting in accept() for a | |
1167 | * connection. | |
1168 | */ | |
1169 | ||
1170 | /* We don't care about attach since we ensure the other side has | |
1171 | * attached by specifying the ATTACH_ONLY flag below. | |
1172 | */ | |
1173 | err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, | |
1174 | vmci_transport_peer_detach_cb, | |
4ef7ea91 | 1175 | vmci_trans(vpending), &detach_sub_id); |
d021c344 AK |
1176 | if (err < VMCI_SUCCESS) { |
1177 | vmci_transport_send_reset(pending, pkt); | |
1178 | err = vmci_transport_error_to_vsock_error(err); | |
1179 | skerr = -err; | |
1180 | goto destroy; | |
1181 | } | |
1182 | ||
1183 | vmci_trans(vpending)->detach_sub_id = detach_sub_id; | |
1184 | ||
1185 | /* Now attach to the queue pair the client created. */ | |
1186 | handle = pkt->u.handle; | |
1187 | ||
1188 | /* vpending->local_addr always has a context id so we do not need to | |
1189 | * worry about VMADDR_CID_ANY in this case. | |
1190 | */ | |
1191 | is_local = | |
1192 | vpending->remote_addr.svm_cid == vpending->local_addr.svm_cid; | |
1193 | flags = VMCI_QPFLAG_ATTACH_ONLY; | |
1194 | flags |= is_local ? VMCI_QPFLAG_LOCAL : 0; | |
1195 | ||
1196 | err = vmci_transport_queue_pair_alloc( | |
1197 | &qpair, | |
1198 | &handle, | |
1199 | vmci_trans(vpending)->produce_size, | |
1200 | vmci_trans(vpending)->consume_size, | |
1201 | pkt->dg.src.context, | |
1202 | flags, | |
1203 | vmci_transport_is_trusted( | |
1204 | vpending, | |
1205 | vpending->remote_addr.svm_cid)); | |
1206 | if (err < 0) { | |
1207 | vmci_transport_send_reset(pending, pkt); | |
1208 | skerr = -err; | |
1209 | goto destroy; | |
1210 | } | |
1211 | ||
1212 | vmci_trans(vpending)->qp_handle = handle; | |
1213 | vmci_trans(vpending)->qpair = qpair; | |
1214 | ||
1215 | /* When we send the attach message, we must be ready to handle incoming | |
1216 | * control messages on the newly connected socket. So we move the | |
1217 | * pending socket to the connected state before sending the attach | |
1218 | * message. Otherwise, an incoming packet triggered by the attach being | |
1219 | * received by the peer may be processed concurrently with what happens | |
1220 | * below after sending the attach message, and that incoming packet | |
1221 | * will find the listening socket instead of the (currently) pending | |
1222 | * socket. Note that enqueueing the socket increments the reference | |
1223 | * count, so even if a reset comes before the connection is accepted, | |
1224 | * the socket will be valid until it is removed from the queue. | |
1225 | * | |
1226 | * If we fail sending the attach below, we remove the socket from the | |
3b4477d2 | 1227 | * connected list and move the socket to TCP_CLOSE before |
d021c344 AK |
1228 | * releasing the lock, so a pending slow path processing of an incoming |
1229 | * packet will not see the socket in the connected state in that case. | |
1230 | */ | |
3b4477d2 | 1231 | pending->sk_state = TCP_ESTABLISHED; |
d021c344 AK |
1232 | |
1233 | vsock_insert_connected(vpending); | |
1234 | ||
1235 | /* Notify our peer of our attach. */ | |
1236 | err = vmci_transport_send_attach(pending, handle); | |
1237 | if (err < 0) { | |
1238 | vsock_remove_connected(vpending); | |
1239 | pr_err("Could not send attach\n"); | |
1240 | vmci_transport_send_reset(pending, pkt); | |
1241 | err = vmci_transport_error_to_vsock_error(err); | |
1242 | skerr = -err; | |
1243 | goto destroy; | |
1244 | } | |
1245 | ||
1246 | /* We have a connection. Move the now connected socket from the | |
1247 | * listener's pending list to the accept queue so callers of accept() | |
1248 | * can find it. | |
1249 | */ | |
1250 | vsock_remove_pending(listener, pending); | |
1251 | vsock_enqueue_accept(listener, pending); | |
1252 | ||
1253 | /* Callers of accept() will be be waiting on the listening socket, not | |
1254 | * the pending socket. | |
1255 | */ | |
7362945a | 1256 | listener->sk_data_ready(listener); |
d021c344 AK |
1257 | |
1258 | return 0; | |
1259 | ||
1260 | destroy: | |
1261 | pending->sk_err = skerr; | |
3b4477d2 | 1262 | pending->sk_state = TCP_CLOSE; |
d021c344 AK |
1263 | /* As long as we drop our reference, all necessary cleanup will handle |
1264 | * when the cleanup function drops its reference and our destruct | |
1265 | * implementation is called. Note that since the listen handler will | |
1266 | * remove pending from the pending list upon our failure, the cleanup | |
1267 | * function won't drop the additional reference, which is why we do it | |
1268 | * here. | |
1269 | */ | |
1270 | sock_put(pending); | |
1271 | ||
1272 | return err; | |
1273 | } | |
1274 | ||
1275 | static int | |
1276 | vmci_transport_recv_connecting_client(struct sock *sk, | |
1277 | struct vmci_transport_packet *pkt) | |
1278 | { | |
1279 | struct vsock_sock *vsk; | |
1280 | int err; | |
1281 | int skerr; | |
1282 | ||
1283 | vsk = vsock_sk(sk); | |
1284 | ||
1285 | switch (pkt->type) { | |
1286 | case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: | |
1287 | if (vmci_handle_is_invalid(pkt->u.handle) || | |
1288 | !vmci_handle_is_equal(pkt->u.handle, | |
1289 | vmci_trans(vsk)->qp_handle)) { | |
1290 | skerr = EPROTO; | |
1291 | err = -EINVAL; | |
1292 | goto destroy; | |
1293 | } | |
1294 | ||
1295 | /* Signify the socket is connected and wakeup the waiter in | |
1296 | * connect(). Also place the socket in the connected table for | |
1297 | * accounting (it can already be found since it's in the bound | |
1298 | * table). | |
1299 | */ | |
3b4477d2 | 1300 | sk->sk_state = TCP_ESTABLISHED; |
d021c344 AK |
1301 | sk->sk_socket->state = SS_CONNECTED; |
1302 | vsock_insert_connected(vsk); | |
1303 | sk->sk_state_change(sk); | |
1304 | ||
1305 | break; | |
1306 | case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: | |
1307 | case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: | |
1308 | if (pkt->u.size == 0 | |
1309 | || pkt->dg.src.context != vsk->remote_addr.svm_cid | |
1310 | || pkt->src_port != vsk->remote_addr.svm_port | |
1311 | || !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle) | |
1312 | || vmci_trans(vsk)->qpair | |
1313 | || vmci_trans(vsk)->produce_size != 0 | |
1314 | || vmci_trans(vsk)->consume_size != 0 | |
d021c344 AK |
1315 | || vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) { |
1316 | skerr = EPROTO; | |
1317 | err = -EINVAL; | |
1318 | ||
1319 | goto destroy; | |
1320 | } | |
1321 | ||
1322 | err = vmci_transport_recv_connecting_client_negotiate(sk, pkt); | |
1323 | if (err) { | |
1324 | skerr = -err; | |
1325 | goto destroy; | |
1326 | } | |
1327 | ||
1328 | break; | |
1329 | case VMCI_TRANSPORT_PACKET_TYPE_INVALID: | |
1330 | err = vmci_transport_recv_connecting_client_invalid(sk, pkt); | |
1331 | if (err) { | |
1332 | skerr = -err; | |
1333 | goto destroy; | |
1334 | } | |
1335 | ||
1336 | break; | |
1337 | case VMCI_TRANSPORT_PACKET_TYPE_RST: | |
1338 | /* Older versions of the linux code (WS 6.5 / ESX 4.0) used to | |
1339 | * continue processing here after they sent an INVALID packet. | |
1340 | * This meant that we got a RST after the INVALID. We ignore a | |
1341 | * RST after an INVALID. The common code doesn't send the RST | |
1342 | * ... so we can hang if an old version of the common code | |
1343 | * fails between getting a REQUEST and sending an OFFER back. | |
1344 | * Not much we can do about it... except hope that it doesn't | |
1345 | * happen. | |
1346 | */ | |
1347 | if (vsk->ignore_connecting_rst) { | |
1348 | vsk->ignore_connecting_rst = false; | |
1349 | } else { | |
1350 | skerr = ECONNRESET; | |
1351 | err = 0; | |
1352 | goto destroy; | |
1353 | } | |
1354 | ||
1355 | break; | |
1356 | default: | |
1357 | /* Close and cleanup the connection. */ | |
1358 | skerr = EPROTO; | |
1359 | err = -EINVAL; | |
1360 | goto destroy; | |
1361 | } | |
1362 | ||
1363 | return 0; | |
1364 | ||
1365 | destroy: | |
1366 | vmci_transport_send_reset(sk, pkt); | |
1367 | ||
3b4477d2 | 1368 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
1369 | sk->sk_err = skerr; |
1370 | sk->sk_error_report(sk); | |
1371 | return err; | |
1372 | } | |
1373 | ||
1374 | static int vmci_transport_recv_connecting_client_negotiate( | |
1375 | struct sock *sk, | |
1376 | struct vmci_transport_packet *pkt) | |
1377 | { | |
1378 | int err; | |
1379 | struct vsock_sock *vsk; | |
1380 | struct vmci_handle handle; | |
1381 | struct vmci_qp *qpair; | |
d021c344 AK |
1382 | u32 detach_sub_id; |
1383 | bool is_local; | |
1384 | u32 flags; | |
1385 | bool old_proto = true; | |
1386 | bool old_pkt_proto; | |
1387 | u16 version; | |
1388 | ||
1389 | vsk = vsock_sk(sk); | |
1390 | handle = VMCI_INVALID_HANDLE; | |
d021c344 AK |
1391 | detach_sub_id = VMCI_INVALID_ID; |
1392 | ||
1393 | /* If we have gotten here then we should be past the point where old | |
1394 | * linux vsock could have sent the bogus rst. | |
1395 | */ | |
1396 | vsk->sent_request = false; | |
1397 | vsk->ignore_connecting_rst = false; | |
1398 | ||
1399 | /* Verify that we're OK with the proposed queue pair size */ | |
1400 | if (pkt->u.size < vmci_trans(vsk)->queue_pair_min_size || | |
1401 | pkt->u.size > vmci_trans(vsk)->queue_pair_max_size) { | |
1402 | err = -EINVAL; | |
1403 | goto destroy; | |
1404 | } | |
1405 | ||
1406 | /* At this point we know the CID the peer is using to talk to us. */ | |
1407 | ||
1408 | if (vsk->local_addr.svm_cid == VMADDR_CID_ANY) | |
1409 | vsk->local_addr.svm_cid = pkt->dg.dst.context; | |
1410 | ||
1411 | /* Setup the notify ops to be the highest supported version that both | |
1412 | * the server and the client support. | |
1413 | */ | |
1414 | ||
1415 | if (vmci_transport_old_proto_override(&old_pkt_proto)) { | |
1416 | old_proto = old_pkt_proto; | |
1417 | } else { | |
1418 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE) | |
1419 | old_proto = true; | |
1420 | else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2) | |
1421 | old_proto = false; | |
1422 | ||
1423 | } | |
1424 | ||
1425 | if (old_proto) | |
1426 | version = VSOCK_PROTO_INVALID; | |
1427 | else | |
1428 | version = pkt->proto; | |
1429 | ||
1430 | if (!vmci_transport_proto_to_notify_struct(sk, &version, old_proto)) { | |
1431 | err = -EINVAL; | |
1432 | goto destroy; | |
1433 | } | |
1434 | ||
4ef7ea91 | 1435 | /* Subscribe to detach events first. |
d021c344 AK |
1436 | * |
1437 | * XXX We attach once for each queue pair created for now so it is easy | |
1438 | * to find the socket (it's provided), but later we should only | |
1439 | * subscribe once and add a way to lookup sockets by queue pair handle. | |
1440 | */ | |
d021c344 AK |
1441 | err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, |
1442 | vmci_transport_peer_detach_cb, | |
4ef7ea91 | 1443 | vmci_trans(vsk), &detach_sub_id); |
d021c344 AK |
1444 | if (err < VMCI_SUCCESS) { |
1445 | err = vmci_transport_error_to_vsock_error(err); | |
1446 | goto destroy; | |
1447 | } | |
1448 | ||
1449 | /* Make VMCI select the handle for us. */ | |
1450 | handle = VMCI_INVALID_HANDLE; | |
1451 | is_local = vsk->remote_addr.svm_cid == vsk->local_addr.svm_cid; | |
1452 | flags = is_local ? VMCI_QPFLAG_LOCAL : 0; | |
1453 | ||
1454 | err = vmci_transport_queue_pair_alloc(&qpair, | |
1455 | &handle, | |
1456 | pkt->u.size, | |
1457 | pkt->u.size, | |
1458 | vsk->remote_addr.svm_cid, | |
1459 | flags, | |
1460 | vmci_transport_is_trusted( | |
1461 | vsk, | |
1462 | vsk-> | |
1463 | remote_addr.svm_cid)); | |
1464 | if (err < 0) | |
1465 | goto destroy; | |
1466 | ||
1467 | err = vmci_transport_send_qp_offer(sk, handle); | |
1468 | if (err < 0) { | |
1469 | err = vmci_transport_error_to_vsock_error(err); | |
1470 | goto destroy; | |
1471 | } | |
1472 | ||
1473 | vmci_trans(vsk)->qp_handle = handle; | |
1474 | vmci_trans(vsk)->qpair = qpair; | |
1475 | ||
1476 | vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = | |
1477 | pkt->u.size; | |
1478 | ||
d021c344 AK |
1479 | vmci_trans(vsk)->detach_sub_id = detach_sub_id; |
1480 | ||
1481 | vmci_trans(vsk)->notify_ops->process_negotiate(sk); | |
1482 | ||
1483 | return 0; | |
1484 | ||
1485 | destroy: | |
d021c344 AK |
1486 | if (detach_sub_id != VMCI_INVALID_ID) |
1487 | vmci_event_unsubscribe(detach_sub_id); | |
1488 | ||
1489 | if (!vmci_handle_is_invalid(handle)) | |
1490 | vmci_qpair_detach(&qpair); | |
1491 | ||
1492 | return err; | |
1493 | } | |
1494 | ||
1495 | static int | |
1496 | vmci_transport_recv_connecting_client_invalid(struct sock *sk, | |
1497 | struct vmci_transport_packet *pkt) | |
1498 | { | |
1499 | int err = 0; | |
1500 | struct vsock_sock *vsk = vsock_sk(sk); | |
1501 | ||
1502 | if (vsk->sent_request) { | |
1503 | vsk->sent_request = false; | |
1504 | vsk->ignore_connecting_rst = true; | |
1505 | ||
1506 | err = vmci_transport_send_conn_request( | |
1507 | sk, vmci_trans(vsk)->queue_pair_size); | |
1508 | if (err < 0) | |
1509 | err = vmci_transport_error_to_vsock_error(err); | |
1510 | else | |
1511 | err = 0; | |
1512 | ||
1513 | } | |
1514 | ||
1515 | return err; | |
1516 | } | |
1517 | ||
1518 | static int vmci_transport_recv_connected(struct sock *sk, | |
1519 | struct vmci_transport_packet *pkt) | |
1520 | { | |
1521 | struct vsock_sock *vsk; | |
1522 | bool pkt_processed = false; | |
1523 | ||
1524 | /* In cases where we are closing the connection, it's sufficient to | |
1525 | * mark the state change (and maybe error) and wake up any waiting | |
1526 | * threads. Since this is a connected socket, it's owned by a user | |
1527 | * process and will be cleaned up when the failure is passed back on | |
1528 | * the current or next system call. Our system call implementations | |
1529 | * must therefore check for error and state changes on entry and when | |
1530 | * being awoken. | |
1531 | */ | |
1532 | switch (pkt->type) { | |
1533 | case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: | |
1534 | if (pkt->u.mode) { | |
1535 | vsk = vsock_sk(sk); | |
1536 | ||
1537 | vsk->peer_shutdown |= pkt->u.mode; | |
1538 | sk->sk_state_change(sk); | |
1539 | } | |
1540 | break; | |
1541 | ||
1542 | case VMCI_TRANSPORT_PACKET_TYPE_RST: | |
1543 | vsk = vsock_sk(sk); | |
1544 | /* It is possible that we sent our peer a message (e.g a | |
1545 | * WAITING_READ) right before we got notified that the peer had | |
1546 | * detached. If that happens then we can get a RST pkt back | |
1547 | * from our peer even though there is data available for us to | |
1548 | * read. In that case, don't shutdown the socket completely but | |
1549 | * instead allow the local client to finish reading data off | |
1550 | * the queuepair. Always treat a RST pkt in connected mode like | |
1551 | * a clean shutdown. | |
1552 | */ | |
1553 | sock_set_flag(sk, SOCK_DONE); | |
1554 | vsk->peer_shutdown = SHUTDOWN_MASK; | |
1555 | if (vsock_stream_has_data(vsk) <= 0) | |
3b4477d2 | 1556 | sk->sk_state = TCP_CLOSING; |
d021c344 AK |
1557 | |
1558 | sk->sk_state_change(sk); | |
1559 | break; | |
1560 | ||
1561 | default: | |
1562 | vsk = vsock_sk(sk); | |
1563 | vmci_trans(vsk)->notify_ops->handle_notify_pkt( | |
1564 | sk, pkt, false, NULL, NULL, | |
1565 | &pkt_processed); | |
1566 | if (!pkt_processed) | |
1567 | return -EINVAL; | |
1568 | ||
1569 | break; | |
1570 | } | |
1571 | ||
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | static int vmci_transport_socket_init(struct vsock_sock *vsk, | |
1576 | struct vsock_sock *psk) | |
1577 | { | |
1578 | vsk->trans = kmalloc(sizeof(struct vmci_transport), GFP_KERNEL); | |
1579 | if (!vsk->trans) | |
1580 | return -ENOMEM; | |
1581 | ||
1582 | vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; | |
1583 | vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE; | |
1584 | vmci_trans(vsk)->qpair = NULL; | |
1585 | vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = 0; | |
4ef7ea91 | 1586 | vmci_trans(vsk)->detach_sub_id = VMCI_INVALID_ID; |
d021c344 | 1587 | vmci_trans(vsk)->notify_ops = NULL; |
4ef7ea91 JH |
1588 | INIT_LIST_HEAD(&vmci_trans(vsk)->elem); |
1589 | vmci_trans(vsk)->sk = &vsk->sk; | |
8566b86a | 1590 | spin_lock_init(&vmci_trans(vsk)->lock); |
d021c344 AK |
1591 | if (psk) { |
1592 | vmci_trans(vsk)->queue_pair_size = | |
1593 | vmci_trans(psk)->queue_pair_size; | |
1594 | vmci_trans(vsk)->queue_pair_min_size = | |
1595 | vmci_trans(psk)->queue_pair_min_size; | |
1596 | vmci_trans(vsk)->queue_pair_max_size = | |
1597 | vmci_trans(psk)->queue_pair_max_size; | |
1598 | } else { | |
1599 | vmci_trans(vsk)->queue_pair_size = | |
1600 | VMCI_TRANSPORT_DEFAULT_QP_SIZE; | |
1601 | vmci_trans(vsk)->queue_pair_min_size = | |
1602 | VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN; | |
1603 | vmci_trans(vsk)->queue_pair_max_size = | |
1604 | VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX; | |
1605 | } | |
1606 | ||
1607 | return 0; | |
1608 | } | |
1609 | ||
4ef7ea91 | 1610 | static void vmci_transport_free_resources(struct list_head *transport_list) |
d021c344 | 1611 | { |
4ef7ea91 JH |
1612 | while (!list_empty(transport_list)) { |
1613 | struct vmci_transport *transport = | |
1614 | list_first_entry(transport_list, struct vmci_transport, | |
1615 | elem); | |
1616 | list_del(&transport->elem); | |
d021c344 | 1617 | |
4ef7ea91 JH |
1618 | if (transport->detach_sub_id != VMCI_INVALID_ID) { |
1619 | vmci_event_unsubscribe(transport->detach_sub_id); | |
1620 | transport->detach_sub_id = VMCI_INVALID_ID; | |
1621 | } | |
d021c344 | 1622 | |
4ef7ea91 JH |
1623 | if (!vmci_handle_is_invalid(transport->qp_handle)) { |
1624 | vmci_qpair_detach(&transport->qpair); | |
1625 | transport->qp_handle = VMCI_INVALID_HANDLE; | |
1626 | transport->produce_size = 0; | |
1627 | transport->consume_size = 0; | |
1628 | } | |
1629 | ||
1630 | kfree(transport); | |
d021c344 | 1631 | } |
4ef7ea91 JH |
1632 | } |
1633 | ||
1634 | static void vmci_transport_cleanup(struct work_struct *work) | |
1635 | { | |
1636 | LIST_HEAD(pending); | |
1637 | ||
1638 | spin_lock_bh(&vmci_transport_cleanup_lock); | |
1639 | list_replace_init(&vmci_transport_cleanup_list, &pending); | |
1640 | spin_unlock_bh(&vmci_transport_cleanup_lock); | |
1641 | vmci_transport_free_resources(&pending); | |
1642 | } | |
1643 | ||
1644 | static void vmci_transport_destruct(struct vsock_sock *vsk) | |
1645 | { | |
225d9464 PA |
1646 | /* transport can be NULL if we hit a failure at init() time */ |
1647 | if (!vmci_trans(vsk)) | |
1648 | return; | |
1649 | ||
4ef7ea91 JH |
1650 | /* Ensure that the detach callback doesn't use the sk/vsk |
1651 | * we are about to destruct. | |
1652 | */ | |
1653 | spin_lock_bh(&vmci_trans(vsk)->lock); | |
1654 | vmci_trans(vsk)->sk = NULL; | |
1655 | spin_unlock_bh(&vmci_trans(vsk)->lock); | |
d021c344 AK |
1656 | |
1657 | if (vmci_trans(vsk)->notify_ops) | |
1658 | vmci_trans(vsk)->notify_ops->socket_destruct(vsk); | |
1659 | ||
4ef7ea91 JH |
1660 | spin_lock_bh(&vmci_transport_cleanup_lock); |
1661 | list_add(&vmci_trans(vsk)->elem, &vmci_transport_cleanup_list); | |
1662 | spin_unlock_bh(&vmci_transport_cleanup_lock); | |
1663 | schedule_work(&vmci_transport_cleanup_work); | |
1664 | ||
d021c344 AK |
1665 | vsk->trans = NULL; |
1666 | } | |
1667 | ||
1668 | static void vmci_transport_release(struct vsock_sock *vsk) | |
1669 | { | |
6773b7dc SH |
1670 | vsock_remove_sock(vsk); |
1671 | ||
d021c344 AK |
1672 | if (!vmci_handle_is_invalid(vmci_trans(vsk)->dg_handle)) { |
1673 | vmci_datagram_destroy_handle(vmci_trans(vsk)->dg_handle); | |
1674 | vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; | |
1675 | } | |
1676 | } | |
1677 | ||
1678 | static int vmci_transport_dgram_bind(struct vsock_sock *vsk, | |
1679 | struct sockaddr_vm *addr) | |
1680 | { | |
1681 | u32 port; | |
1682 | u32 flags; | |
1683 | int err; | |
1684 | ||
1685 | /* VMCI will select a resource ID for us if we provide | |
1686 | * VMCI_INVALID_ID. | |
1687 | */ | |
1688 | port = addr->svm_port == VMADDR_PORT_ANY ? | |
1689 | VMCI_INVALID_ID : addr->svm_port; | |
1690 | ||
1691 | if (port <= LAST_RESERVED_PORT && !capable(CAP_NET_BIND_SERVICE)) | |
1692 | return -EACCES; | |
1693 | ||
1694 | flags = addr->svm_cid == VMADDR_CID_ANY ? | |
1695 | VMCI_FLAG_ANYCID_DG_HND : 0; | |
1696 | ||
1697 | err = vmci_transport_datagram_create_hnd(port, flags, | |
1698 | vmci_transport_recv_dgram_cb, | |
1699 | &vsk->sk, | |
1700 | &vmci_trans(vsk)->dg_handle); | |
1701 | if (err < VMCI_SUCCESS) | |
1702 | return vmci_transport_error_to_vsock_error(err); | |
1703 | vsock_addr_init(&vsk->local_addr, addr->svm_cid, | |
1704 | vmci_trans(vsk)->dg_handle.resource); | |
1705 | ||
1706 | return 0; | |
1707 | } | |
1708 | ||
1709 | static int vmci_transport_dgram_enqueue( | |
1710 | struct vsock_sock *vsk, | |
1711 | struct sockaddr_vm *remote_addr, | |
0f7db23a | 1712 | struct msghdr *msg, |
d021c344 AK |
1713 | size_t len) |
1714 | { | |
1715 | int err; | |
1716 | struct vmci_datagram *dg; | |
1717 | ||
1718 | if (len > VMCI_MAX_DG_PAYLOAD_SIZE) | |
1719 | return -EMSGSIZE; | |
1720 | ||
1721 | if (!vmci_transport_allow_dgram(vsk, remote_addr->svm_cid)) | |
1722 | return -EPERM; | |
1723 | ||
1724 | /* Allocate a buffer for the user's message and our packet header. */ | |
1725 | dg = kmalloc(len + sizeof(*dg), GFP_KERNEL); | |
1726 | if (!dg) | |
1727 | return -ENOMEM; | |
1728 | ||
0f7db23a | 1729 | memcpy_from_msg(VMCI_DG_PAYLOAD(dg), msg, len); |
d021c344 AK |
1730 | |
1731 | dg->dst = vmci_make_handle(remote_addr->svm_cid, | |
1732 | remote_addr->svm_port); | |
1733 | dg->src = vmci_make_handle(vsk->local_addr.svm_cid, | |
1734 | vsk->local_addr.svm_port); | |
1735 | dg->payload_size = len; | |
1736 | ||
1737 | err = vmci_datagram_send(dg); | |
1738 | kfree(dg); | |
1739 | if (err < 0) | |
1740 | return vmci_transport_error_to_vsock_error(err); | |
1741 | ||
1742 | return err - sizeof(*dg); | |
1743 | } | |
1744 | ||
1b784140 | 1745 | static int vmci_transport_dgram_dequeue(struct vsock_sock *vsk, |
d021c344 AK |
1746 | struct msghdr *msg, size_t len, |
1747 | int flags) | |
1748 | { | |
1749 | int err; | |
1750 | int noblock; | |
1751 | struct vmci_datagram *dg; | |
1752 | size_t payload_len; | |
1753 | struct sk_buff *skb; | |
1754 | ||
1755 | noblock = flags & MSG_DONTWAIT; | |
1756 | ||
1757 | if (flags & MSG_OOB || flags & MSG_ERRQUEUE) | |
1758 | return -EOPNOTSUPP; | |
1759 | ||
1760 | /* Retrieve the head sk_buff from the socket's receive queue. */ | |
1761 | err = 0; | |
1762 | skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err); | |
d021c344 | 1763 | if (!skb) |
9c995cc9 | 1764 | return err; |
d021c344 AK |
1765 | |
1766 | dg = (struct vmci_datagram *)skb->data; | |
1767 | if (!dg) | |
1768 | /* err is 0, meaning we read zero bytes. */ | |
1769 | goto out; | |
1770 | ||
1771 | payload_len = dg->payload_size; | |
1772 | /* Ensure the sk_buff matches the payload size claimed in the packet. */ | |
1773 | if (payload_len != skb->len - sizeof(*dg)) { | |
1774 | err = -EINVAL; | |
1775 | goto out; | |
1776 | } | |
1777 | ||
1778 | if (payload_len > len) { | |
1779 | payload_len = len; | |
1780 | msg->msg_flags |= MSG_TRUNC; | |
1781 | } | |
1782 | ||
1783 | /* Place the datagram payload in the user's iovec. */ | |
51f3d02b | 1784 | err = skb_copy_datagram_msg(skb, sizeof(*dg), msg, payload_len); |
d021c344 AK |
1785 | if (err) |
1786 | goto out; | |
1787 | ||
d021c344 | 1788 | if (msg->msg_name) { |
d021c344 | 1789 | /* Provide the address of the sender. */ |
342dfc30 | 1790 | DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name); |
d021c344 AK |
1791 | vsock_addr_init(vm_addr, dg->src.context, dg->src.resource); |
1792 | msg->msg_namelen = sizeof(*vm_addr); | |
1793 | } | |
1794 | err = payload_len; | |
1795 | ||
1796 | out: | |
1797 | skb_free_datagram(&vsk->sk, skb); | |
1798 | return err; | |
1799 | } | |
1800 | ||
1801 | static bool vmci_transport_dgram_allow(u32 cid, u32 port) | |
1802 | { | |
1803 | if (cid == VMADDR_CID_HYPERVISOR) { | |
1804 | /* Registrations of PBRPC Servers do not modify VMX/Hypervisor | |
1805 | * state and are allowed. | |
1806 | */ | |
1807 | return port == VMCI_UNITY_PBRPC_REGISTER; | |
1808 | } | |
1809 | ||
1810 | return true; | |
1811 | } | |
1812 | ||
1813 | static int vmci_transport_connect(struct vsock_sock *vsk) | |
1814 | { | |
1815 | int err; | |
1816 | bool old_pkt_proto = false; | |
1817 | struct sock *sk = &vsk->sk; | |
1818 | ||
1819 | if (vmci_transport_old_proto_override(&old_pkt_proto) && | |
1820 | old_pkt_proto) { | |
1821 | err = vmci_transport_send_conn_request( | |
1822 | sk, vmci_trans(vsk)->queue_pair_size); | |
1823 | if (err < 0) { | |
3b4477d2 | 1824 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
1825 | return err; |
1826 | } | |
1827 | } else { | |
1828 | int supported_proto_versions = | |
1829 | vmci_transport_new_proto_supported_versions(); | |
1830 | err = vmci_transport_send_conn_request2( | |
1831 | sk, vmci_trans(vsk)->queue_pair_size, | |
1832 | supported_proto_versions); | |
1833 | if (err < 0) { | |
3b4477d2 | 1834 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
1835 | return err; |
1836 | } | |
1837 | ||
1838 | vsk->sent_request = true; | |
1839 | } | |
1840 | ||
1841 | return err; | |
1842 | } | |
1843 | ||
1844 | static ssize_t vmci_transport_stream_dequeue( | |
1845 | struct vsock_sock *vsk, | |
0f7db23a | 1846 | struct msghdr *msg, |
d021c344 AK |
1847 | size_t len, |
1848 | int flags) | |
1849 | { | |
1850 | if (flags & MSG_PEEK) | |
d838df2e | 1851 | return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0); |
d021c344 | 1852 | else |
d838df2e | 1853 | return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0); |
d021c344 AK |
1854 | } |
1855 | ||
1856 | static ssize_t vmci_transport_stream_enqueue( | |
1857 | struct vsock_sock *vsk, | |
0f7db23a | 1858 | struct msghdr *msg, |
d021c344 AK |
1859 | size_t len) |
1860 | { | |
4c946d9c | 1861 | return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0); |
d021c344 AK |
1862 | } |
1863 | ||
1864 | static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk) | |
1865 | { | |
1866 | return vmci_qpair_consume_buf_ready(vmci_trans(vsk)->qpair); | |
1867 | } | |
1868 | ||
1869 | static s64 vmci_transport_stream_has_space(struct vsock_sock *vsk) | |
1870 | { | |
1871 | return vmci_qpair_produce_free_space(vmci_trans(vsk)->qpair); | |
1872 | } | |
1873 | ||
1874 | static u64 vmci_transport_stream_rcvhiwat(struct vsock_sock *vsk) | |
1875 | { | |
1876 | return vmci_trans(vsk)->consume_size; | |
1877 | } | |
1878 | ||
1879 | static bool vmci_transport_stream_is_active(struct vsock_sock *vsk) | |
1880 | { | |
1881 | return !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle); | |
1882 | } | |
1883 | ||
1884 | static u64 vmci_transport_get_buffer_size(struct vsock_sock *vsk) | |
1885 | { | |
1886 | return vmci_trans(vsk)->queue_pair_size; | |
1887 | } | |
1888 | ||
1889 | static u64 vmci_transport_get_min_buffer_size(struct vsock_sock *vsk) | |
1890 | { | |
1891 | return vmci_trans(vsk)->queue_pair_min_size; | |
1892 | } | |
1893 | ||
1894 | static u64 vmci_transport_get_max_buffer_size(struct vsock_sock *vsk) | |
1895 | { | |
1896 | return vmci_trans(vsk)->queue_pair_max_size; | |
1897 | } | |
1898 | ||
1899 | static void vmci_transport_set_buffer_size(struct vsock_sock *vsk, u64 val) | |
1900 | { | |
1901 | if (val < vmci_trans(vsk)->queue_pair_min_size) | |
1902 | vmci_trans(vsk)->queue_pair_min_size = val; | |
1903 | if (val > vmci_trans(vsk)->queue_pair_max_size) | |
1904 | vmci_trans(vsk)->queue_pair_max_size = val; | |
1905 | vmci_trans(vsk)->queue_pair_size = val; | |
1906 | } | |
1907 | ||
1908 | static void vmci_transport_set_min_buffer_size(struct vsock_sock *vsk, | |
1909 | u64 val) | |
1910 | { | |
1911 | if (val > vmci_trans(vsk)->queue_pair_size) | |
1912 | vmci_trans(vsk)->queue_pair_size = val; | |
1913 | vmci_trans(vsk)->queue_pair_min_size = val; | |
1914 | } | |
1915 | ||
1916 | static void vmci_transport_set_max_buffer_size(struct vsock_sock *vsk, | |
1917 | u64 val) | |
1918 | { | |
1919 | if (val < vmci_trans(vsk)->queue_pair_size) | |
1920 | vmci_trans(vsk)->queue_pair_size = val; | |
1921 | vmci_trans(vsk)->queue_pair_max_size = val; | |
1922 | } | |
1923 | ||
1924 | static int vmci_transport_notify_poll_in( | |
1925 | struct vsock_sock *vsk, | |
1926 | size_t target, | |
1927 | bool *data_ready_now) | |
1928 | { | |
1929 | return vmci_trans(vsk)->notify_ops->poll_in( | |
1930 | &vsk->sk, target, data_ready_now); | |
1931 | } | |
1932 | ||
1933 | static int vmci_transport_notify_poll_out( | |
1934 | struct vsock_sock *vsk, | |
1935 | size_t target, | |
1936 | bool *space_available_now) | |
1937 | { | |
1938 | return vmci_trans(vsk)->notify_ops->poll_out( | |
1939 | &vsk->sk, target, space_available_now); | |
1940 | } | |
1941 | ||
1942 | static int vmci_transport_notify_recv_init( | |
1943 | struct vsock_sock *vsk, | |
1944 | size_t target, | |
1945 | struct vsock_transport_recv_notify_data *data) | |
1946 | { | |
1947 | return vmci_trans(vsk)->notify_ops->recv_init( | |
1948 | &vsk->sk, target, | |
1949 | (struct vmci_transport_recv_notify_data *)data); | |
1950 | } | |
1951 | ||
1952 | static int vmci_transport_notify_recv_pre_block( | |
1953 | struct vsock_sock *vsk, | |
1954 | size_t target, | |
1955 | struct vsock_transport_recv_notify_data *data) | |
1956 | { | |
1957 | return vmci_trans(vsk)->notify_ops->recv_pre_block( | |
1958 | &vsk->sk, target, | |
1959 | (struct vmci_transport_recv_notify_data *)data); | |
1960 | } | |
1961 | ||
1962 | static int vmci_transport_notify_recv_pre_dequeue( | |
1963 | struct vsock_sock *vsk, | |
1964 | size_t target, | |
1965 | struct vsock_transport_recv_notify_data *data) | |
1966 | { | |
1967 | return vmci_trans(vsk)->notify_ops->recv_pre_dequeue( | |
1968 | &vsk->sk, target, | |
1969 | (struct vmci_transport_recv_notify_data *)data); | |
1970 | } | |
1971 | ||
1972 | static int vmci_transport_notify_recv_post_dequeue( | |
1973 | struct vsock_sock *vsk, | |
1974 | size_t target, | |
1975 | ssize_t copied, | |
1976 | bool data_read, | |
1977 | struct vsock_transport_recv_notify_data *data) | |
1978 | { | |
1979 | return vmci_trans(vsk)->notify_ops->recv_post_dequeue( | |
1980 | &vsk->sk, target, copied, data_read, | |
1981 | (struct vmci_transport_recv_notify_data *)data); | |
1982 | } | |
1983 | ||
1984 | static int vmci_transport_notify_send_init( | |
1985 | struct vsock_sock *vsk, | |
1986 | struct vsock_transport_send_notify_data *data) | |
1987 | { | |
1988 | return vmci_trans(vsk)->notify_ops->send_init( | |
1989 | &vsk->sk, | |
1990 | (struct vmci_transport_send_notify_data *)data); | |
1991 | } | |
1992 | ||
1993 | static int vmci_transport_notify_send_pre_block( | |
1994 | struct vsock_sock *vsk, | |
1995 | struct vsock_transport_send_notify_data *data) | |
1996 | { | |
1997 | return vmci_trans(vsk)->notify_ops->send_pre_block( | |
1998 | &vsk->sk, | |
1999 | (struct vmci_transport_send_notify_data *)data); | |
2000 | } | |
2001 | ||
2002 | static int vmci_transport_notify_send_pre_enqueue( | |
2003 | struct vsock_sock *vsk, | |
2004 | struct vsock_transport_send_notify_data *data) | |
2005 | { | |
2006 | return vmci_trans(vsk)->notify_ops->send_pre_enqueue( | |
2007 | &vsk->sk, | |
2008 | (struct vmci_transport_send_notify_data *)data); | |
2009 | } | |
2010 | ||
2011 | static int vmci_transport_notify_send_post_enqueue( | |
2012 | struct vsock_sock *vsk, | |
2013 | ssize_t written, | |
2014 | struct vsock_transport_send_notify_data *data) | |
2015 | { | |
2016 | return vmci_trans(vsk)->notify_ops->send_post_enqueue( | |
2017 | &vsk->sk, written, | |
2018 | (struct vmci_transport_send_notify_data *)data); | |
2019 | } | |
2020 | ||
2021 | static bool vmci_transport_old_proto_override(bool *old_pkt_proto) | |
2022 | { | |
2023 | if (PROTOCOL_OVERRIDE != -1) { | |
2024 | if (PROTOCOL_OVERRIDE == 0) | |
2025 | *old_pkt_proto = true; | |
2026 | else | |
2027 | *old_pkt_proto = false; | |
2028 | ||
2029 | pr_info("Proto override in use\n"); | |
2030 | return true; | |
2031 | } | |
2032 | ||
2033 | return false; | |
2034 | } | |
2035 | ||
2036 | static bool vmci_transport_proto_to_notify_struct(struct sock *sk, | |
2037 | u16 *proto, | |
2038 | bool old_pkt_proto) | |
2039 | { | |
2040 | struct vsock_sock *vsk = vsock_sk(sk); | |
2041 | ||
2042 | if (old_pkt_proto) { | |
2043 | if (*proto != VSOCK_PROTO_INVALID) { | |
2044 | pr_err("Can't set both an old and new protocol\n"); | |
2045 | return false; | |
2046 | } | |
2047 | vmci_trans(vsk)->notify_ops = &vmci_transport_notify_pkt_ops; | |
2048 | goto exit; | |
2049 | } | |
2050 | ||
2051 | switch (*proto) { | |
2052 | case VSOCK_PROTO_PKT_ON_NOTIFY: | |
2053 | vmci_trans(vsk)->notify_ops = | |
2054 | &vmci_transport_notify_pkt_q_state_ops; | |
2055 | break; | |
2056 | default: | |
2057 | pr_err("Unknown notify protocol version\n"); | |
2058 | return false; | |
2059 | } | |
2060 | ||
2061 | exit: | |
2062 | vmci_trans(vsk)->notify_ops->socket_init(sk); | |
2063 | return true; | |
2064 | } | |
2065 | ||
2066 | static u16 vmci_transport_new_proto_supported_versions(void) | |
2067 | { | |
2068 | if (PROTOCOL_OVERRIDE != -1) | |
2069 | return PROTOCOL_OVERRIDE; | |
2070 | ||
2071 | return VSOCK_PROTO_ALL_SUPPORTED; | |
2072 | } | |
2073 | ||
2074 | static u32 vmci_transport_get_local_cid(void) | |
2075 | { | |
2076 | return vmci_get_context_id(); | |
2077 | } | |
2078 | ||
56130915 | 2079 | static const struct vsock_transport vmci_transport = { |
d021c344 AK |
2080 | .init = vmci_transport_socket_init, |
2081 | .destruct = vmci_transport_destruct, | |
2082 | .release = vmci_transport_release, | |
2083 | .connect = vmci_transport_connect, | |
2084 | .dgram_bind = vmci_transport_dgram_bind, | |
2085 | .dgram_dequeue = vmci_transport_dgram_dequeue, | |
2086 | .dgram_enqueue = vmci_transport_dgram_enqueue, | |
2087 | .dgram_allow = vmci_transport_dgram_allow, | |
2088 | .stream_dequeue = vmci_transport_stream_dequeue, | |
2089 | .stream_enqueue = vmci_transport_stream_enqueue, | |
2090 | .stream_has_data = vmci_transport_stream_has_data, | |
2091 | .stream_has_space = vmci_transport_stream_has_space, | |
2092 | .stream_rcvhiwat = vmci_transport_stream_rcvhiwat, | |
2093 | .stream_is_active = vmci_transport_stream_is_active, | |
2094 | .stream_allow = vmci_transport_stream_allow, | |
2095 | .notify_poll_in = vmci_transport_notify_poll_in, | |
2096 | .notify_poll_out = vmci_transport_notify_poll_out, | |
2097 | .notify_recv_init = vmci_transport_notify_recv_init, | |
2098 | .notify_recv_pre_block = vmci_transport_notify_recv_pre_block, | |
2099 | .notify_recv_pre_dequeue = vmci_transport_notify_recv_pre_dequeue, | |
2100 | .notify_recv_post_dequeue = vmci_transport_notify_recv_post_dequeue, | |
2101 | .notify_send_init = vmci_transport_notify_send_init, | |
2102 | .notify_send_pre_block = vmci_transport_notify_send_pre_block, | |
2103 | .notify_send_pre_enqueue = vmci_transport_notify_send_pre_enqueue, | |
2104 | .notify_send_post_enqueue = vmci_transport_notify_send_post_enqueue, | |
2105 | .shutdown = vmci_transport_shutdown, | |
2106 | .set_buffer_size = vmci_transport_set_buffer_size, | |
2107 | .set_min_buffer_size = vmci_transport_set_min_buffer_size, | |
2108 | .set_max_buffer_size = vmci_transport_set_max_buffer_size, | |
2109 | .get_buffer_size = vmci_transport_get_buffer_size, | |
2110 | .get_min_buffer_size = vmci_transport_get_min_buffer_size, | |
2111 | .get_max_buffer_size = vmci_transport_get_max_buffer_size, | |
2112 | .get_local_cid = vmci_transport_get_local_cid, | |
2113 | }; | |
2114 | ||
2115 | static int __init vmci_transport_init(void) | |
2116 | { | |
2117 | int err; | |
2118 | ||
2119 | /* Create the datagram handle that we will use to send and receive all | |
2120 | * VSocket control messages for this context. | |
2121 | */ | |
2122 | err = vmci_transport_datagram_create_hnd(VMCI_TRANSPORT_PACKET_RID, | |
2123 | VMCI_FLAG_ANYCID_DG_HND, | |
2124 | vmci_transport_recv_stream_cb, | |
2125 | NULL, | |
2126 | &vmci_transport_stream_handle); | |
2127 | if (err < VMCI_SUCCESS) { | |
2128 | pr_err("Unable to create datagram handle. (%d)\n", err); | |
2129 | return vmci_transport_error_to_vsock_error(err); | |
2130 | } | |
2131 | ||
2132 | err = vmci_event_subscribe(VMCI_EVENT_QP_RESUMED, | |
2133 | vmci_transport_qp_resumed_cb, | |
2134 | NULL, &vmci_transport_qp_resumed_sub_id); | |
2135 | if (err < VMCI_SUCCESS) { | |
2136 | pr_err("Unable to subscribe to resumed event. (%d)\n", err); | |
2137 | err = vmci_transport_error_to_vsock_error(err); | |
2138 | vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; | |
2139 | goto err_destroy_stream_handle; | |
2140 | } | |
2141 | ||
2142 | err = vsock_core_init(&vmci_transport); | |
2143 | if (err < 0) | |
2144 | goto err_unsubscribe; | |
2145 | ||
2146 | return 0; | |
2147 | ||
2148 | err_unsubscribe: | |
2149 | vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); | |
2150 | err_destroy_stream_handle: | |
2151 | vmci_datagram_destroy_handle(vmci_transport_stream_handle); | |
2152 | return err; | |
2153 | } | |
2154 | module_init(vmci_transport_init); | |
2155 | ||
2156 | static void __exit vmci_transport_exit(void) | |
2157 | { | |
4ef7ea91 JH |
2158 | cancel_work_sync(&vmci_transport_cleanup_work); |
2159 | vmci_transport_free_resources(&vmci_transport_cleanup_list); | |
2160 | ||
d021c344 AK |
2161 | if (!vmci_handle_is_invalid(vmci_transport_stream_handle)) { |
2162 | if (vmci_datagram_destroy_handle( | |
2163 | vmci_transport_stream_handle) != VMCI_SUCCESS) | |
2164 | pr_err("Couldn't destroy datagram handle\n"); | |
2165 | vmci_transport_stream_handle = VMCI_INVALID_HANDLE; | |
2166 | } | |
2167 | ||
2168 | if (vmci_transport_qp_resumed_sub_id != VMCI_INVALID_ID) { | |
2169 | vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); | |
2170 | vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; | |
2171 | } | |
2172 | ||
2173 | vsock_core_exit(); | |
2174 | } | |
2175 | module_exit(vmci_transport_exit); | |
2176 | ||
2177 | MODULE_AUTHOR("VMware, Inc."); | |
2178 | MODULE_DESCRIPTION("VMCI transport for Virtual Sockets"); | |
afbea2cd | 2179 | MODULE_VERSION("1.0.5.0-k"); |
d021c344 AK |
2180 | MODULE_LICENSE("GPL v2"); |
2181 | MODULE_ALIAS("vmware_vsock"); | |
2182 | MODULE_ALIAS_NETPROTO(PF_VSOCK); |