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d021c344 AK |
1 | /* |
2 | * VMware vSockets Driver | |
3 | * | |
4 | * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation version 2 and no later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | */ | |
15 | ||
16 | #include <linux/types.h> | |
d021c344 AK |
17 | #include <linux/bitops.h> |
18 | #include <linux/cred.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/io.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/kmod.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/miscdevice.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/net.h> | |
28 | #include <linux/poll.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/smp.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/stddef.h> | |
33 | #include <linux/unistd.h> | |
34 | #include <linux/wait.h> | |
35 | #include <linux/workqueue.h> | |
36 | #include <net/sock.h> | |
37 | ||
38 | #include "af_vsock.h" | |
39 | #include "vmci_transport_notify.h" | |
40 | ||
41 | static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg); | |
42 | static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg); | |
43 | static void vmci_transport_peer_attach_cb(u32 sub_id, | |
44 | const struct vmci_event_data *ed, | |
45 | void *client_data); | |
46 | static void vmci_transport_peer_detach_cb(u32 sub_id, | |
47 | const struct vmci_event_data *ed, | |
48 | void *client_data); | |
49 | static void vmci_transport_recv_pkt_work(struct work_struct *work); | |
50 | static int vmci_transport_recv_listen(struct sock *sk, | |
51 | struct vmci_transport_packet *pkt); | |
52 | static int vmci_transport_recv_connecting_server( | |
53 | struct sock *sk, | |
54 | struct sock *pending, | |
55 | struct vmci_transport_packet *pkt); | |
56 | static int vmci_transport_recv_connecting_client( | |
57 | struct sock *sk, | |
58 | struct vmci_transport_packet *pkt); | |
59 | static int vmci_transport_recv_connecting_client_negotiate( | |
60 | struct sock *sk, | |
61 | struct vmci_transport_packet *pkt); | |
62 | static int vmci_transport_recv_connecting_client_invalid( | |
63 | struct sock *sk, | |
64 | struct vmci_transport_packet *pkt); | |
65 | static int vmci_transport_recv_connected(struct sock *sk, | |
66 | struct vmci_transport_packet *pkt); | |
67 | static bool vmci_transport_old_proto_override(bool *old_pkt_proto); | |
68 | static u16 vmci_transport_new_proto_supported_versions(void); | |
69 | static bool vmci_transport_proto_to_notify_struct(struct sock *sk, u16 *proto, | |
70 | bool old_pkt_proto); | |
71 | ||
72 | struct vmci_transport_recv_pkt_info { | |
73 | struct work_struct work; | |
74 | struct sock *sk; | |
75 | struct vmci_transport_packet pkt; | |
76 | }; | |
77 | ||
78 | static struct vmci_handle vmci_transport_stream_handle = { VMCI_INVALID_ID, | |
79 | VMCI_INVALID_ID }; | |
80 | static u32 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; | |
81 | ||
82 | static int PROTOCOL_OVERRIDE = -1; | |
83 | ||
84 | #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN 128 | |
85 | #define VMCI_TRANSPORT_DEFAULT_QP_SIZE 262144 | |
86 | #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX 262144 | |
87 | ||
88 | /* The default peer timeout indicates how long we will wait for a peer response | |
89 | * to a control message. | |
90 | */ | |
91 | #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) | |
92 | ||
93 | #define SS_LISTEN 255 | |
94 | ||
95 | /* Helper function to convert from a VMCI error code to a VSock error code. */ | |
96 | ||
97 | static s32 vmci_transport_error_to_vsock_error(s32 vmci_error) | |
98 | { | |
99 | int err; | |
100 | ||
101 | switch (vmci_error) { | |
102 | case VMCI_ERROR_NO_MEM: | |
103 | err = ENOMEM; | |
104 | break; | |
105 | case VMCI_ERROR_DUPLICATE_ENTRY: | |
106 | case VMCI_ERROR_ALREADY_EXISTS: | |
107 | err = EADDRINUSE; | |
108 | break; | |
109 | case VMCI_ERROR_NO_ACCESS: | |
110 | err = EPERM; | |
111 | break; | |
112 | case VMCI_ERROR_NO_RESOURCES: | |
113 | err = ENOBUFS; | |
114 | break; | |
115 | case VMCI_ERROR_INVALID_RESOURCE: | |
116 | err = EHOSTUNREACH; | |
117 | break; | |
118 | case VMCI_ERROR_INVALID_ARGS: | |
119 | default: | |
120 | err = EINVAL; | |
121 | } | |
122 | ||
123 | return err > 0 ? -err : err; | |
124 | } | |
125 | ||
2a89f924 RG |
126 | static u32 vmci_transport_peer_rid(u32 peer_cid) |
127 | { | |
128 | if (VMADDR_CID_HYPERVISOR == peer_cid) | |
129 | return VMCI_TRANSPORT_HYPERVISOR_PACKET_RID; | |
130 | ||
131 | return VMCI_TRANSPORT_PACKET_RID; | |
132 | } | |
133 | ||
d021c344 AK |
134 | static inline void |
135 | vmci_transport_packet_init(struct vmci_transport_packet *pkt, | |
136 | struct sockaddr_vm *src, | |
137 | struct sockaddr_vm *dst, | |
138 | u8 type, | |
139 | u64 size, | |
140 | u64 mode, | |
141 | struct vmci_transport_waiting_info *wait, | |
142 | u16 proto, | |
143 | struct vmci_handle handle) | |
144 | { | |
145 | /* We register the stream control handler as an any cid handle so we | |
146 | * must always send from a source address of VMADDR_CID_ANY | |
147 | */ | |
148 | pkt->dg.src = vmci_make_handle(VMADDR_CID_ANY, | |
149 | VMCI_TRANSPORT_PACKET_RID); | |
150 | pkt->dg.dst = vmci_make_handle(dst->svm_cid, | |
2a89f924 | 151 | vmci_transport_peer_rid(dst->svm_cid)); |
d021c344 AK |
152 | pkt->dg.payload_size = sizeof(*pkt) - sizeof(pkt->dg); |
153 | pkt->version = VMCI_TRANSPORT_PACKET_VERSION; | |
154 | pkt->type = type; | |
155 | pkt->src_port = src->svm_port; | |
156 | pkt->dst_port = dst->svm_port; | |
157 | memset(&pkt->proto, 0, sizeof(pkt->proto)); | |
158 | memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2)); | |
159 | ||
160 | switch (pkt->type) { | |
161 | case VMCI_TRANSPORT_PACKET_TYPE_INVALID: | |
162 | pkt->u.size = 0; | |
163 | break; | |
164 | ||
165 | case VMCI_TRANSPORT_PACKET_TYPE_REQUEST: | |
166 | case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: | |
167 | pkt->u.size = size; | |
168 | break; | |
169 | ||
170 | case VMCI_TRANSPORT_PACKET_TYPE_OFFER: | |
171 | case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: | |
172 | pkt->u.handle = handle; | |
173 | break; | |
174 | ||
175 | case VMCI_TRANSPORT_PACKET_TYPE_WROTE: | |
176 | case VMCI_TRANSPORT_PACKET_TYPE_READ: | |
177 | case VMCI_TRANSPORT_PACKET_TYPE_RST: | |
178 | pkt->u.size = 0; | |
179 | break; | |
180 | ||
181 | case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: | |
182 | pkt->u.mode = mode; | |
183 | break; | |
184 | ||
185 | case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ: | |
186 | case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE: | |
187 | memcpy(&pkt->u.wait, wait, sizeof(pkt->u.wait)); | |
188 | break; | |
189 | ||
190 | case VMCI_TRANSPORT_PACKET_TYPE_REQUEST2: | |
191 | case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: | |
192 | pkt->u.size = size; | |
193 | pkt->proto = proto; | |
194 | break; | |
195 | } | |
196 | } | |
197 | ||
198 | static inline void | |
199 | vmci_transport_packet_get_addresses(struct vmci_transport_packet *pkt, | |
200 | struct sockaddr_vm *local, | |
201 | struct sockaddr_vm *remote) | |
202 | { | |
203 | vsock_addr_init(local, pkt->dg.dst.context, pkt->dst_port); | |
204 | vsock_addr_init(remote, pkt->dg.src.context, pkt->src_port); | |
205 | } | |
206 | ||
207 | static int | |
208 | __vmci_transport_send_control_pkt(struct vmci_transport_packet *pkt, | |
209 | struct sockaddr_vm *src, | |
210 | struct sockaddr_vm *dst, | |
211 | enum vmci_transport_packet_type type, | |
212 | u64 size, | |
213 | u64 mode, | |
214 | struct vmci_transport_waiting_info *wait, | |
215 | u16 proto, | |
216 | struct vmci_handle handle, | |
217 | bool convert_error) | |
218 | { | |
219 | int err; | |
220 | ||
221 | vmci_transport_packet_init(pkt, src, dst, type, size, mode, wait, | |
222 | proto, handle); | |
223 | err = vmci_datagram_send(&pkt->dg); | |
224 | if (convert_error && (err < 0)) | |
225 | return vmci_transport_error_to_vsock_error(err); | |
226 | ||
227 | return err; | |
228 | } | |
229 | ||
230 | static int | |
231 | vmci_transport_reply_control_pkt_fast(struct vmci_transport_packet *pkt, | |
232 | enum vmci_transport_packet_type type, | |
233 | u64 size, | |
234 | u64 mode, | |
235 | struct vmci_transport_waiting_info *wait, | |
236 | struct vmci_handle handle) | |
237 | { | |
238 | struct vmci_transport_packet reply; | |
239 | struct sockaddr_vm src, dst; | |
240 | ||
241 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) { | |
242 | return 0; | |
243 | } else { | |
244 | vmci_transport_packet_get_addresses(pkt, &src, &dst); | |
245 | return __vmci_transport_send_control_pkt(&reply, &src, &dst, | |
246 | type, | |
247 | size, mode, wait, | |
248 | VSOCK_PROTO_INVALID, | |
249 | handle, true); | |
250 | } | |
251 | } | |
252 | ||
253 | static int | |
254 | vmci_transport_send_control_pkt_bh(struct sockaddr_vm *src, | |
255 | struct sockaddr_vm *dst, | |
256 | enum vmci_transport_packet_type type, | |
257 | u64 size, | |
258 | u64 mode, | |
259 | struct vmci_transport_waiting_info *wait, | |
260 | struct vmci_handle handle) | |
261 | { | |
262 | /* Note that it is safe to use a single packet across all CPUs since | |
263 | * two tasklets of the same type are guaranteed to not ever run | |
264 | * simultaneously. If that ever changes, or VMCI stops using tasklets, | |
265 | * we can use per-cpu packets. | |
266 | */ | |
267 | static struct vmci_transport_packet pkt; | |
268 | ||
269 | return __vmci_transport_send_control_pkt(&pkt, src, dst, type, | |
270 | size, mode, wait, | |
271 | VSOCK_PROTO_INVALID, handle, | |
272 | false); | |
273 | } | |
274 | ||
275 | static int | |
276 | vmci_transport_send_control_pkt(struct sock *sk, | |
277 | enum vmci_transport_packet_type type, | |
278 | u64 size, | |
279 | u64 mode, | |
280 | struct vmci_transport_waiting_info *wait, | |
281 | u16 proto, | |
282 | struct vmci_handle handle) | |
283 | { | |
284 | struct vmci_transport_packet *pkt; | |
285 | struct vsock_sock *vsk; | |
286 | int err; | |
287 | ||
288 | vsk = vsock_sk(sk); | |
289 | ||
290 | if (!vsock_addr_bound(&vsk->local_addr)) | |
291 | return -EINVAL; | |
292 | ||
293 | if (!vsock_addr_bound(&vsk->remote_addr)) | |
294 | return -EINVAL; | |
295 | ||
296 | pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); | |
297 | if (!pkt) | |
298 | return -ENOMEM; | |
299 | ||
300 | err = __vmci_transport_send_control_pkt(pkt, &vsk->local_addr, | |
301 | &vsk->remote_addr, type, size, | |
302 | mode, wait, proto, handle, | |
303 | true); | |
304 | kfree(pkt); | |
305 | ||
306 | return err; | |
307 | } | |
308 | ||
309 | static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst, | |
310 | struct sockaddr_vm *src, | |
311 | struct vmci_transport_packet *pkt) | |
312 | { | |
313 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) | |
314 | return 0; | |
315 | return vmci_transport_send_control_pkt_bh( | |
316 | dst, src, | |
317 | VMCI_TRANSPORT_PACKET_TYPE_RST, 0, | |
318 | 0, NULL, VMCI_INVALID_HANDLE); | |
319 | } | |
320 | ||
321 | static int vmci_transport_send_reset(struct sock *sk, | |
322 | struct vmci_transport_packet *pkt) | |
323 | { | |
324 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) | |
325 | return 0; | |
326 | return vmci_transport_send_control_pkt(sk, | |
327 | VMCI_TRANSPORT_PACKET_TYPE_RST, | |
328 | 0, 0, NULL, VSOCK_PROTO_INVALID, | |
329 | VMCI_INVALID_HANDLE); | |
330 | } | |
331 | ||
332 | static int vmci_transport_send_negotiate(struct sock *sk, size_t size) | |
333 | { | |
334 | return vmci_transport_send_control_pkt( | |
335 | sk, | |
336 | VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE, | |
337 | size, 0, NULL, | |
338 | VSOCK_PROTO_INVALID, | |
339 | VMCI_INVALID_HANDLE); | |
340 | } | |
341 | ||
342 | static int vmci_transport_send_negotiate2(struct sock *sk, size_t size, | |
343 | u16 version) | |
344 | { | |
345 | return vmci_transport_send_control_pkt( | |
346 | sk, | |
347 | VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2, | |
348 | size, 0, NULL, version, | |
349 | VMCI_INVALID_HANDLE); | |
350 | } | |
351 | ||
352 | static int vmci_transport_send_qp_offer(struct sock *sk, | |
353 | struct vmci_handle handle) | |
354 | { | |
355 | return vmci_transport_send_control_pkt( | |
356 | sk, VMCI_TRANSPORT_PACKET_TYPE_OFFER, 0, | |
357 | 0, NULL, | |
358 | VSOCK_PROTO_INVALID, handle); | |
359 | } | |
360 | ||
361 | static int vmci_transport_send_attach(struct sock *sk, | |
362 | struct vmci_handle handle) | |
363 | { | |
364 | return vmci_transport_send_control_pkt( | |
365 | sk, VMCI_TRANSPORT_PACKET_TYPE_ATTACH, | |
366 | 0, 0, NULL, VSOCK_PROTO_INVALID, | |
367 | handle); | |
368 | } | |
369 | ||
370 | static int vmci_transport_reply_reset(struct vmci_transport_packet *pkt) | |
371 | { | |
372 | return vmci_transport_reply_control_pkt_fast( | |
373 | pkt, | |
374 | VMCI_TRANSPORT_PACKET_TYPE_RST, | |
375 | 0, 0, NULL, | |
376 | VMCI_INVALID_HANDLE); | |
377 | } | |
378 | ||
379 | static int vmci_transport_send_invalid_bh(struct sockaddr_vm *dst, | |
380 | struct sockaddr_vm *src) | |
381 | { | |
382 | return vmci_transport_send_control_pkt_bh( | |
383 | dst, src, | |
384 | VMCI_TRANSPORT_PACKET_TYPE_INVALID, | |
385 | 0, 0, NULL, VMCI_INVALID_HANDLE); | |
386 | } | |
387 | ||
388 | int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst, | |
389 | struct sockaddr_vm *src) | |
390 | { | |
391 | return vmci_transport_send_control_pkt_bh( | |
392 | dst, src, | |
393 | VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, | |
394 | 0, NULL, VMCI_INVALID_HANDLE); | |
395 | } | |
396 | ||
397 | int vmci_transport_send_read_bh(struct sockaddr_vm *dst, | |
398 | struct sockaddr_vm *src) | |
399 | { | |
400 | return vmci_transport_send_control_pkt_bh( | |
401 | dst, src, | |
402 | VMCI_TRANSPORT_PACKET_TYPE_READ, 0, | |
403 | 0, NULL, VMCI_INVALID_HANDLE); | |
404 | } | |
405 | ||
406 | int vmci_transport_send_wrote(struct sock *sk) | |
407 | { | |
408 | return vmci_transport_send_control_pkt( | |
409 | sk, VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, | |
410 | 0, NULL, VSOCK_PROTO_INVALID, | |
411 | VMCI_INVALID_HANDLE); | |
412 | } | |
413 | ||
414 | int vmci_transport_send_read(struct sock *sk) | |
415 | { | |
416 | return vmci_transport_send_control_pkt( | |
417 | sk, VMCI_TRANSPORT_PACKET_TYPE_READ, 0, | |
418 | 0, NULL, VSOCK_PROTO_INVALID, | |
419 | VMCI_INVALID_HANDLE); | |
420 | } | |
421 | ||
422 | int vmci_transport_send_waiting_write(struct sock *sk, | |
423 | struct vmci_transport_waiting_info *wait) | |
424 | { | |
425 | return vmci_transport_send_control_pkt( | |
426 | sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE, | |
427 | 0, 0, wait, VSOCK_PROTO_INVALID, | |
428 | VMCI_INVALID_HANDLE); | |
429 | } | |
430 | ||
431 | int vmci_transport_send_waiting_read(struct sock *sk, | |
432 | struct vmci_transport_waiting_info *wait) | |
433 | { | |
434 | return vmci_transport_send_control_pkt( | |
435 | sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ, | |
436 | 0, 0, wait, VSOCK_PROTO_INVALID, | |
437 | VMCI_INVALID_HANDLE); | |
438 | } | |
439 | ||
440 | static int vmci_transport_shutdown(struct vsock_sock *vsk, int mode) | |
441 | { | |
442 | return vmci_transport_send_control_pkt( | |
443 | &vsk->sk, | |
444 | VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN, | |
445 | 0, mode, NULL, | |
446 | VSOCK_PROTO_INVALID, | |
447 | VMCI_INVALID_HANDLE); | |
448 | } | |
449 | ||
450 | static int vmci_transport_send_conn_request(struct sock *sk, size_t size) | |
451 | { | |
452 | return vmci_transport_send_control_pkt(sk, | |
453 | VMCI_TRANSPORT_PACKET_TYPE_REQUEST, | |
454 | size, 0, NULL, | |
455 | VSOCK_PROTO_INVALID, | |
456 | VMCI_INVALID_HANDLE); | |
457 | } | |
458 | ||
459 | static int vmci_transport_send_conn_request2(struct sock *sk, size_t size, | |
460 | u16 version) | |
461 | { | |
462 | return vmci_transport_send_control_pkt( | |
463 | sk, VMCI_TRANSPORT_PACKET_TYPE_REQUEST2, | |
464 | size, 0, NULL, version, | |
465 | VMCI_INVALID_HANDLE); | |
466 | } | |
467 | ||
468 | static struct sock *vmci_transport_get_pending( | |
469 | struct sock *listener, | |
470 | struct vmci_transport_packet *pkt) | |
471 | { | |
472 | struct vsock_sock *vlistener; | |
473 | struct vsock_sock *vpending; | |
474 | struct sock *pending; | |
990454b5 RG |
475 | struct sockaddr_vm src; |
476 | ||
477 | vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); | |
d021c344 AK |
478 | |
479 | vlistener = vsock_sk(listener); | |
480 | ||
481 | list_for_each_entry(vpending, &vlistener->pending_links, | |
482 | pending_links) { | |
d021c344 | 483 | if (vsock_addr_equals_addr(&src, &vpending->remote_addr) && |
990454b5 | 484 | pkt->dst_port == vpending->local_addr.svm_port) { |
d021c344 AK |
485 | pending = sk_vsock(vpending); |
486 | sock_hold(pending); | |
487 | goto found; | |
488 | } | |
489 | } | |
490 | ||
491 | pending = NULL; | |
492 | found: | |
493 | return pending; | |
494 | ||
495 | } | |
496 | ||
497 | static void vmci_transport_release_pending(struct sock *pending) | |
498 | { | |
499 | sock_put(pending); | |
500 | } | |
501 | ||
502 | /* We allow two kinds of sockets to communicate with a restricted VM: 1) | |
503 | * trusted sockets 2) sockets from applications running as the same user as the | |
504 | * VM (this is only true for the host side and only when using hosted products) | |
505 | */ | |
506 | ||
507 | static bool vmci_transport_is_trusted(struct vsock_sock *vsock, u32 peer_cid) | |
508 | { | |
509 | return vsock->trusted || | |
510 | vmci_is_context_owner(peer_cid, vsock->owner->uid); | |
511 | } | |
512 | ||
513 | /* We allow sending datagrams to and receiving datagrams from a restricted VM | |
514 | * only if it is trusted as described in vmci_transport_is_trusted. | |
515 | */ | |
516 | ||
517 | static bool vmci_transport_allow_dgram(struct vsock_sock *vsock, u32 peer_cid) | |
518 | { | |
2a89f924 RG |
519 | if (VMADDR_CID_HYPERVISOR == peer_cid) |
520 | return true; | |
521 | ||
d021c344 AK |
522 | if (vsock->cached_peer != peer_cid) { |
523 | vsock->cached_peer = peer_cid; | |
524 | if (!vmci_transport_is_trusted(vsock, peer_cid) && | |
525 | (vmci_context_get_priv_flags(peer_cid) & | |
526 | VMCI_PRIVILEGE_FLAG_RESTRICTED)) { | |
527 | vsock->cached_peer_allow_dgram = false; | |
528 | } else { | |
529 | vsock->cached_peer_allow_dgram = true; | |
530 | } | |
531 | } | |
532 | ||
533 | return vsock->cached_peer_allow_dgram; | |
534 | } | |
535 | ||
536 | static int | |
537 | vmci_transport_queue_pair_alloc(struct vmci_qp **qpair, | |
538 | struct vmci_handle *handle, | |
539 | u64 produce_size, | |
540 | u64 consume_size, | |
541 | u32 peer, u32 flags, bool trusted) | |
542 | { | |
543 | int err = 0; | |
544 | ||
545 | if (trusted) { | |
546 | /* Try to allocate our queue pair as trusted. This will only | |
547 | * work if vsock is running in the host. | |
548 | */ | |
549 | ||
550 | err = vmci_qpair_alloc(qpair, handle, produce_size, | |
551 | consume_size, | |
552 | peer, flags, | |
553 | VMCI_PRIVILEGE_FLAG_TRUSTED); | |
554 | if (err != VMCI_ERROR_NO_ACCESS) | |
555 | goto out; | |
556 | ||
557 | } | |
558 | ||
559 | err = vmci_qpair_alloc(qpair, handle, produce_size, consume_size, | |
560 | peer, flags, VMCI_NO_PRIVILEGE_FLAGS); | |
561 | out: | |
562 | if (err < 0) { | |
563 | pr_err("Could not attach to queue pair with %d\n", | |
564 | err); | |
565 | err = vmci_transport_error_to_vsock_error(err); | |
566 | } | |
567 | ||
568 | return err; | |
569 | } | |
570 | ||
571 | static int | |
572 | vmci_transport_datagram_create_hnd(u32 resource_id, | |
573 | u32 flags, | |
574 | vmci_datagram_recv_cb recv_cb, | |
575 | void *client_data, | |
576 | struct vmci_handle *out_handle) | |
577 | { | |
578 | int err = 0; | |
579 | ||
580 | /* Try to allocate our datagram handler as trusted. This will only work | |
581 | * if vsock is running in the host. | |
582 | */ | |
583 | ||
584 | err = vmci_datagram_create_handle_priv(resource_id, flags, | |
585 | VMCI_PRIVILEGE_FLAG_TRUSTED, | |
586 | recv_cb, | |
587 | client_data, out_handle); | |
588 | ||
589 | if (err == VMCI_ERROR_NO_ACCESS) | |
590 | err = vmci_datagram_create_handle(resource_id, flags, | |
591 | recv_cb, client_data, | |
592 | out_handle); | |
593 | ||
594 | return err; | |
595 | } | |
596 | ||
597 | /* This is invoked as part of a tasklet that's scheduled when the VMCI | |
598 | * interrupt fires. This is run in bottom-half context and if it ever needs to | |
599 | * sleep it should defer that work to a work queue. | |
600 | */ | |
601 | ||
602 | static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg) | |
603 | { | |
604 | struct sock *sk; | |
605 | size_t size; | |
606 | struct sk_buff *skb; | |
607 | struct vsock_sock *vsk; | |
608 | ||
609 | sk = (struct sock *)data; | |
610 | ||
611 | /* This handler is privileged when this module is running on the host. | |
612 | * We will get datagrams from all endpoints (even VMs that are in a | |
613 | * restricted context). If we get one from a restricted context then | |
614 | * the destination socket must be trusted. | |
615 | * | |
616 | * NOTE: We access the socket struct without holding the lock here. | |
617 | * This is ok because the field we are interested is never modified | |
618 | * outside of the create and destruct socket functions. | |
619 | */ | |
620 | vsk = vsock_sk(sk); | |
621 | if (!vmci_transport_allow_dgram(vsk, dg->src.context)) | |
622 | return VMCI_ERROR_NO_ACCESS; | |
623 | ||
624 | size = VMCI_DG_SIZE(dg); | |
625 | ||
626 | /* Attach the packet to the socket's receive queue as an sk_buff. */ | |
627 | skb = alloc_skb(size, GFP_ATOMIC); | |
628 | if (skb) { | |
629 | /* sk_receive_skb() will do a sock_put(), so hold here. */ | |
630 | sock_hold(sk); | |
631 | skb_put(skb, size); | |
632 | memcpy(skb->data, dg, size); | |
633 | sk_receive_skb(sk, skb, 0); | |
634 | } | |
635 | ||
636 | return VMCI_SUCCESS; | |
637 | } | |
638 | ||
639 | static bool vmci_transport_stream_allow(u32 cid, u32 port) | |
640 | { | |
641 | static const u32 non_socket_contexts[] = { | |
d021c344 AK |
642 | VMADDR_CID_RESERVED, |
643 | }; | |
644 | int i; | |
645 | ||
646 | BUILD_BUG_ON(sizeof(cid) != sizeof(*non_socket_contexts)); | |
647 | ||
648 | for (i = 0; i < ARRAY_SIZE(non_socket_contexts); i++) { | |
649 | if (cid == non_socket_contexts[i]) | |
650 | return false; | |
651 | } | |
652 | ||
653 | return true; | |
654 | } | |
655 | ||
656 | /* This is invoked as part of a tasklet that's scheduled when the VMCI | |
657 | * interrupt fires. This is run in bottom-half context but it defers most of | |
658 | * its work to the packet handling work queue. | |
659 | */ | |
660 | ||
661 | static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg) | |
662 | { | |
663 | struct sock *sk; | |
664 | struct sockaddr_vm dst; | |
665 | struct sockaddr_vm src; | |
666 | struct vmci_transport_packet *pkt; | |
667 | struct vsock_sock *vsk; | |
668 | bool bh_process_pkt; | |
669 | int err; | |
670 | ||
671 | sk = NULL; | |
672 | err = VMCI_SUCCESS; | |
673 | bh_process_pkt = false; | |
674 | ||
675 | /* Ignore incoming packets from contexts without sockets, or resources | |
676 | * that aren't vsock implementations. | |
677 | */ | |
678 | ||
679 | if (!vmci_transport_stream_allow(dg->src.context, -1) | |
2a89f924 | 680 | || vmci_transport_peer_rid(dg->src.context) != dg->src.resource) |
d021c344 AK |
681 | return VMCI_ERROR_NO_ACCESS; |
682 | ||
683 | if (VMCI_DG_SIZE(dg) < sizeof(*pkt)) | |
684 | /* Drop datagrams that do not contain full VSock packets. */ | |
685 | return VMCI_ERROR_INVALID_ARGS; | |
686 | ||
687 | pkt = (struct vmci_transport_packet *)dg; | |
688 | ||
689 | /* Find the socket that should handle this packet. First we look for a | |
690 | * connected socket and if there is none we look for a socket bound to | |
691 | * the destintation address. | |
692 | */ | |
693 | vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); | |
694 | vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port); | |
695 | ||
696 | sk = vsock_find_connected_socket(&src, &dst); | |
697 | if (!sk) { | |
698 | sk = vsock_find_bound_socket(&dst); | |
699 | if (!sk) { | |
700 | /* We could not find a socket for this specified | |
701 | * address. If this packet is a RST, we just drop it. | |
702 | * If it is another packet, we send a RST. Note that | |
703 | * we do not send a RST reply to RSTs so that we do not | |
704 | * continually send RSTs between two endpoints. | |
705 | * | |
706 | * Note that since this is a reply, dst is src and src | |
707 | * is dst. | |
708 | */ | |
709 | if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) | |
710 | pr_err("unable to send reset\n"); | |
711 | ||
712 | err = VMCI_ERROR_NOT_FOUND; | |
713 | goto out; | |
714 | } | |
715 | } | |
716 | ||
717 | /* If the received packet type is beyond all types known to this | |
718 | * implementation, reply with an invalid message. Hopefully this will | |
719 | * help when implementing backwards compatibility in the future. | |
720 | */ | |
721 | if (pkt->type >= VMCI_TRANSPORT_PACKET_TYPE_MAX) { | |
722 | vmci_transport_send_invalid_bh(&dst, &src); | |
723 | err = VMCI_ERROR_INVALID_ARGS; | |
724 | goto out; | |
725 | } | |
726 | ||
727 | /* This handler is privileged when this module is running on the host. | |
728 | * We will get datagram connect requests from all endpoints (even VMs | |
729 | * that are in a restricted context). If we get one from a restricted | |
730 | * context then the destination socket must be trusted. | |
731 | * | |
732 | * NOTE: We access the socket struct without holding the lock here. | |
733 | * This is ok because the field we are interested is never modified | |
734 | * outside of the create and destruct socket functions. | |
735 | */ | |
736 | vsk = vsock_sk(sk); | |
737 | if (!vmci_transport_allow_dgram(vsk, pkt->dg.src.context)) { | |
738 | err = VMCI_ERROR_NO_ACCESS; | |
739 | goto out; | |
740 | } | |
741 | ||
742 | /* We do most everything in a work queue, but let's fast path the | |
743 | * notification of reads and writes to help data transfer performance. | |
744 | * We can only do this if there is no process context code executing | |
745 | * for this socket since that may change the state. | |
746 | */ | |
747 | bh_lock_sock(sk); | |
748 | ||
990454b5 RG |
749 | if (!sock_owned_by_user(sk)) { |
750 | /* The local context ID may be out of date, update it. */ | |
751 | vsk->local_addr.svm_cid = dst.svm_cid; | |
752 | ||
753 | if (sk->sk_state == SS_CONNECTED) | |
754 | vmci_trans(vsk)->notify_ops->handle_notify_pkt( | |
755 | sk, pkt, true, &dst, &src, | |
756 | &bh_process_pkt); | |
757 | } | |
d021c344 AK |
758 | |
759 | bh_unlock_sock(sk); | |
760 | ||
761 | if (!bh_process_pkt) { | |
762 | struct vmci_transport_recv_pkt_info *recv_pkt_info; | |
763 | ||
764 | recv_pkt_info = kmalloc(sizeof(*recv_pkt_info), GFP_ATOMIC); | |
765 | if (!recv_pkt_info) { | |
766 | if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) | |
767 | pr_err("unable to send reset\n"); | |
768 | ||
769 | err = VMCI_ERROR_NO_MEM; | |
770 | goto out; | |
771 | } | |
772 | ||
773 | recv_pkt_info->sk = sk; | |
774 | memcpy(&recv_pkt_info->pkt, pkt, sizeof(recv_pkt_info->pkt)); | |
775 | INIT_WORK(&recv_pkt_info->work, vmci_transport_recv_pkt_work); | |
776 | ||
777 | schedule_work(&recv_pkt_info->work); | |
778 | /* Clear sk so that the reference count incremented by one of | |
779 | * the Find functions above is not decremented below. We need | |
780 | * that reference count for the packet handler we've scheduled | |
781 | * to run. | |
782 | */ | |
783 | sk = NULL; | |
784 | } | |
785 | ||
786 | out: | |
787 | if (sk) | |
788 | sock_put(sk); | |
789 | ||
790 | return err; | |
791 | } | |
792 | ||
793 | static void vmci_transport_peer_attach_cb(u32 sub_id, | |
794 | const struct vmci_event_data *e_data, | |
795 | void *client_data) | |
796 | { | |
797 | struct sock *sk = client_data; | |
798 | const struct vmci_event_payload_qp *e_payload; | |
799 | struct vsock_sock *vsk; | |
800 | ||
801 | e_payload = vmci_event_data_const_payload(e_data); | |
802 | ||
803 | vsk = vsock_sk(sk); | |
804 | ||
805 | /* We don't ask for delayed CBs when we subscribe to this event (we | |
806 | * pass 0 as flags to vmci_event_subscribe()). VMCI makes no | |
807 | * guarantees in that case about what context we might be running in, | |
808 | * so it could be BH or process, blockable or non-blockable. So we | |
809 | * need to account for all possible contexts here. | |
810 | */ | |
811 | local_bh_disable(); | |
812 | bh_lock_sock(sk); | |
813 | ||
814 | /* XXX This is lame, we should provide a way to lookup sockets by | |
815 | * qp_handle. | |
816 | */ | |
817 | if (vmci_handle_is_equal(vmci_trans(vsk)->qp_handle, | |
818 | e_payload->handle)) { | |
819 | /* XXX This doesn't do anything, but in the future we may want | |
820 | * to set a flag here to verify the attach really did occur and | |
821 | * we weren't just sent a datagram claiming it was. | |
822 | */ | |
823 | goto out; | |
824 | } | |
825 | ||
826 | out: | |
827 | bh_unlock_sock(sk); | |
828 | local_bh_enable(); | |
829 | } | |
830 | ||
831 | static void vmci_transport_handle_detach(struct sock *sk) | |
832 | { | |
833 | struct vsock_sock *vsk; | |
834 | ||
835 | vsk = vsock_sk(sk); | |
836 | if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) { | |
837 | sock_set_flag(sk, SOCK_DONE); | |
838 | ||
839 | /* On a detach the peer will not be sending or receiving | |
840 | * anymore. | |
841 | */ | |
842 | vsk->peer_shutdown = SHUTDOWN_MASK; | |
843 | ||
844 | /* We should not be sending anymore since the peer won't be | |
845 | * there to receive, but we can still receive if there is data | |
846 | * left in our consume queue. | |
847 | */ | |
848 | if (vsock_stream_has_data(vsk) <= 0) { | |
849 | if (sk->sk_state == SS_CONNECTING) { | |
850 | /* The peer may detach from a queue pair while | |
851 | * we are still in the connecting state, i.e., | |
852 | * if the peer VM is killed after attaching to | |
853 | * a queue pair, but before we complete the | |
854 | * handshake. In that case, we treat the detach | |
855 | * event like a reset. | |
856 | */ | |
857 | ||
858 | sk->sk_state = SS_UNCONNECTED; | |
859 | sk->sk_err = ECONNRESET; | |
860 | sk->sk_error_report(sk); | |
861 | return; | |
862 | } | |
863 | sk->sk_state = SS_UNCONNECTED; | |
864 | } | |
865 | sk->sk_state_change(sk); | |
866 | } | |
867 | } | |
868 | ||
869 | static void vmci_transport_peer_detach_cb(u32 sub_id, | |
870 | const struct vmci_event_data *e_data, | |
871 | void *client_data) | |
872 | { | |
873 | struct sock *sk = client_data; | |
874 | const struct vmci_event_payload_qp *e_payload; | |
875 | struct vsock_sock *vsk; | |
876 | ||
877 | e_payload = vmci_event_data_const_payload(e_data); | |
878 | vsk = vsock_sk(sk); | |
879 | if (vmci_handle_is_invalid(e_payload->handle)) | |
880 | return; | |
881 | ||
882 | /* Same rules for locking as for peer_attach_cb(). */ | |
883 | local_bh_disable(); | |
884 | bh_lock_sock(sk); | |
885 | ||
886 | /* XXX This is lame, we should provide a way to lookup sockets by | |
887 | * qp_handle. | |
888 | */ | |
889 | if (vmci_handle_is_equal(vmci_trans(vsk)->qp_handle, | |
890 | e_payload->handle)) | |
891 | vmci_transport_handle_detach(sk); | |
892 | ||
893 | bh_unlock_sock(sk); | |
894 | local_bh_enable(); | |
895 | } | |
896 | ||
897 | static void vmci_transport_qp_resumed_cb(u32 sub_id, | |
898 | const struct vmci_event_data *e_data, | |
899 | void *client_data) | |
900 | { | |
901 | vsock_for_each_connected_socket(vmci_transport_handle_detach); | |
902 | } | |
903 | ||
904 | static void vmci_transport_recv_pkt_work(struct work_struct *work) | |
905 | { | |
906 | struct vmci_transport_recv_pkt_info *recv_pkt_info; | |
907 | struct vmci_transport_packet *pkt; | |
908 | struct sock *sk; | |
909 | ||
910 | recv_pkt_info = | |
911 | container_of(work, struct vmci_transport_recv_pkt_info, work); | |
912 | sk = recv_pkt_info->sk; | |
913 | pkt = &recv_pkt_info->pkt; | |
914 | ||
915 | lock_sock(sk); | |
916 | ||
990454b5 RG |
917 | /* The local context ID may be out of date. */ |
918 | vsock_sk(sk)->local_addr.svm_cid = pkt->dg.dst.context; | |
919 | ||
d021c344 AK |
920 | switch (sk->sk_state) { |
921 | case SS_LISTEN: | |
922 | vmci_transport_recv_listen(sk, pkt); | |
923 | break; | |
924 | case SS_CONNECTING: | |
925 | /* Processing of pending connections for servers goes through | |
926 | * the listening socket, so see vmci_transport_recv_listen() | |
927 | * for that path. | |
928 | */ | |
929 | vmci_transport_recv_connecting_client(sk, pkt); | |
930 | break; | |
931 | case SS_CONNECTED: | |
932 | vmci_transport_recv_connected(sk, pkt); | |
933 | break; | |
934 | default: | |
935 | /* Because this function does not run in the same context as | |
936 | * vmci_transport_recv_stream_cb it is possible that the | |
937 | * socket has closed. We need to let the other side know or it | |
938 | * could be sitting in a connect and hang forever. Send a | |
939 | * reset to prevent that. | |
940 | */ | |
941 | vmci_transport_send_reset(sk, pkt); | |
942 | goto out; | |
943 | } | |
944 | ||
945 | out: | |
946 | release_sock(sk); | |
947 | kfree(recv_pkt_info); | |
948 | /* Release reference obtained in the stream callback when we fetched | |
949 | * this socket out of the bound or connected list. | |
950 | */ | |
951 | sock_put(sk); | |
952 | } | |
953 | ||
954 | static int vmci_transport_recv_listen(struct sock *sk, | |
955 | struct vmci_transport_packet *pkt) | |
956 | { | |
957 | struct sock *pending; | |
958 | struct vsock_sock *vpending; | |
959 | int err; | |
960 | u64 qp_size; | |
961 | bool old_request = false; | |
962 | bool old_pkt_proto = false; | |
963 | ||
964 | err = 0; | |
965 | ||
966 | /* Because we are in the listen state, we could be receiving a packet | |
967 | * for ourself or any previous connection requests that we received. | |
968 | * If it's the latter, we try to find a socket in our list of pending | |
969 | * connections and, if we do, call the appropriate handler for the | |
970 | * state that that socket is in. Otherwise we try to service the | |
971 | * connection request. | |
972 | */ | |
973 | pending = vmci_transport_get_pending(sk, pkt); | |
974 | if (pending) { | |
975 | lock_sock(pending); | |
990454b5 RG |
976 | |
977 | /* The local context ID may be out of date. */ | |
978 | vsock_sk(pending)->local_addr.svm_cid = pkt->dg.dst.context; | |
979 | ||
d021c344 AK |
980 | switch (pending->sk_state) { |
981 | case SS_CONNECTING: | |
982 | err = vmci_transport_recv_connecting_server(sk, | |
983 | pending, | |
984 | pkt); | |
985 | break; | |
986 | default: | |
987 | vmci_transport_send_reset(pending, pkt); | |
988 | err = -EINVAL; | |
989 | } | |
990 | ||
991 | if (err < 0) | |
992 | vsock_remove_pending(sk, pending); | |
993 | ||
994 | release_sock(pending); | |
995 | vmci_transport_release_pending(pending); | |
996 | ||
997 | return err; | |
998 | } | |
999 | ||
1000 | /* The listen state only accepts connection requests. Reply with a | |
1001 | * reset unless we received a reset. | |
1002 | */ | |
1003 | ||
1004 | if (!(pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST || | |
1005 | pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)) { | |
1006 | vmci_transport_reply_reset(pkt); | |
1007 | return -EINVAL; | |
1008 | } | |
1009 | ||
1010 | if (pkt->u.size == 0) { | |
1011 | vmci_transport_reply_reset(pkt); | |
1012 | return -EINVAL; | |
1013 | } | |
1014 | ||
1015 | /* If this socket can't accommodate this connection request, we send a | |
1016 | * reset. Otherwise we create and initialize a child socket and reply | |
1017 | * with a connection negotiation. | |
1018 | */ | |
1019 | if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) { | |
1020 | vmci_transport_reply_reset(pkt); | |
1021 | return -ECONNREFUSED; | |
1022 | } | |
1023 | ||
1024 | pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL, | |
1025 | sk->sk_type); | |
1026 | if (!pending) { | |
1027 | vmci_transport_send_reset(sk, pkt); | |
1028 | return -ENOMEM; | |
1029 | } | |
1030 | ||
1031 | vpending = vsock_sk(pending); | |
1032 | ||
1033 | vsock_addr_init(&vpending->local_addr, pkt->dg.dst.context, | |
1034 | pkt->dst_port); | |
1035 | vsock_addr_init(&vpending->remote_addr, pkt->dg.src.context, | |
1036 | pkt->src_port); | |
1037 | ||
1038 | /* If the proposed size fits within our min/max, accept it. Otherwise | |
1039 | * propose our own size. | |
1040 | */ | |
1041 | if (pkt->u.size >= vmci_trans(vpending)->queue_pair_min_size && | |
1042 | pkt->u.size <= vmci_trans(vpending)->queue_pair_max_size) { | |
1043 | qp_size = pkt->u.size; | |
1044 | } else { | |
1045 | qp_size = vmci_trans(vpending)->queue_pair_size; | |
1046 | } | |
1047 | ||
1048 | /* Figure out if we are using old or new requests based on the | |
1049 | * overrides pkt types sent by our peer. | |
1050 | */ | |
1051 | if (vmci_transport_old_proto_override(&old_pkt_proto)) { | |
1052 | old_request = old_pkt_proto; | |
1053 | } else { | |
1054 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST) | |
1055 | old_request = true; | |
1056 | else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2) | |
1057 | old_request = false; | |
1058 | ||
1059 | } | |
1060 | ||
1061 | if (old_request) { | |
1062 | /* Handle a REQUEST (or override) */ | |
1063 | u16 version = VSOCK_PROTO_INVALID; | |
1064 | if (vmci_transport_proto_to_notify_struct( | |
1065 | pending, &version, true)) | |
1066 | err = vmci_transport_send_negotiate(pending, qp_size); | |
1067 | else | |
1068 | err = -EINVAL; | |
1069 | ||
1070 | } else { | |
1071 | /* Handle a REQUEST2 (or override) */ | |
1072 | int proto_int = pkt->proto; | |
1073 | int pos; | |
1074 | u16 active_proto_version = 0; | |
1075 | ||
1076 | /* The list of possible protocols is the intersection of all | |
1077 | * protocols the client supports ... plus all the protocols we | |
1078 | * support. | |
1079 | */ | |
1080 | proto_int &= vmci_transport_new_proto_supported_versions(); | |
1081 | ||
1082 | /* We choose the highest possible protocol version and use that | |
1083 | * one. | |
1084 | */ | |
1085 | pos = fls(proto_int); | |
1086 | if (pos) { | |
1087 | active_proto_version = (1 << (pos - 1)); | |
1088 | if (vmci_transport_proto_to_notify_struct( | |
1089 | pending, &active_proto_version, false)) | |
1090 | err = vmci_transport_send_negotiate2(pending, | |
1091 | qp_size, | |
1092 | active_proto_version); | |
1093 | else | |
1094 | err = -EINVAL; | |
1095 | ||
1096 | } else { | |
1097 | err = -EINVAL; | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | if (err < 0) { | |
1102 | vmci_transport_send_reset(sk, pkt); | |
1103 | sock_put(pending); | |
1104 | err = vmci_transport_error_to_vsock_error(err); | |
1105 | goto out; | |
1106 | } | |
1107 | ||
1108 | vsock_add_pending(sk, pending); | |
1109 | sk->sk_ack_backlog++; | |
1110 | ||
1111 | pending->sk_state = SS_CONNECTING; | |
1112 | vmci_trans(vpending)->produce_size = | |
1113 | vmci_trans(vpending)->consume_size = qp_size; | |
1114 | vmci_trans(vpending)->queue_pair_size = qp_size; | |
1115 | ||
1116 | vmci_trans(vpending)->notify_ops->process_request(pending); | |
1117 | ||
1118 | /* We might never receive another message for this socket and it's not | |
1119 | * connected to any process, so we have to ensure it gets cleaned up | |
1120 | * ourself. Our delayed work function will take care of that. Note | |
1121 | * that we do not ever cancel this function since we have few | |
1122 | * guarantees about its state when calling cancel_delayed_work(). | |
1123 | * Instead we hold a reference on the socket for that function and make | |
1124 | * it capable of handling cases where it needs to do nothing but | |
1125 | * release that reference. | |
1126 | */ | |
1127 | vpending->listener = sk; | |
1128 | sock_hold(sk); | |
1129 | sock_hold(pending); | |
1130 | INIT_DELAYED_WORK(&vpending->dwork, vsock_pending_work); | |
1131 | schedule_delayed_work(&vpending->dwork, HZ); | |
1132 | ||
1133 | out: | |
1134 | return err; | |
1135 | } | |
1136 | ||
1137 | static int | |
1138 | vmci_transport_recv_connecting_server(struct sock *listener, | |
1139 | struct sock *pending, | |
1140 | struct vmci_transport_packet *pkt) | |
1141 | { | |
1142 | struct vsock_sock *vpending; | |
1143 | struct vmci_handle handle; | |
1144 | struct vmci_qp *qpair; | |
1145 | bool is_local; | |
1146 | u32 flags; | |
1147 | u32 detach_sub_id; | |
1148 | int err; | |
1149 | int skerr; | |
1150 | ||
1151 | vpending = vsock_sk(pending); | |
1152 | detach_sub_id = VMCI_INVALID_ID; | |
1153 | ||
1154 | switch (pkt->type) { | |
1155 | case VMCI_TRANSPORT_PACKET_TYPE_OFFER: | |
1156 | if (vmci_handle_is_invalid(pkt->u.handle)) { | |
1157 | vmci_transport_send_reset(pending, pkt); | |
1158 | skerr = EPROTO; | |
1159 | err = -EINVAL; | |
1160 | goto destroy; | |
1161 | } | |
1162 | break; | |
1163 | default: | |
1164 | /* Close and cleanup the connection. */ | |
1165 | vmci_transport_send_reset(pending, pkt); | |
1166 | skerr = EPROTO; | |
1167 | err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; | |
1168 | goto destroy; | |
1169 | } | |
1170 | ||
1171 | /* In order to complete the connection we need to attach to the offered | |
1172 | * queue pair and send an attach notification. We also subscribe to the | |
1173 | * detach event so we know when our peer goes away, and we do that | |
1174 | * before attaching so we don't miss an event. If all this succeeds, | |
1175 | * we update our state and wakeup anything waiting in accept() for a | |
1176 | * connection. | |
1177 | */ | |
1178 | ||
1179 | /* We don't care about attach since we ensure the other side has | |
1180 | * attached by specifying the ATTACH_ONLY flag below. | |
1181 | */ | |
1182 | err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, | |
1183 | vmci_transport_peer_detach_cb, | |
1184 | pending, &detach_sub_id); | |
1185 | if (err < VMCI_SUCCESS) { | |
1186 | vmci_transport_send_reset(pending, pkt); | |
1187 | err = vmci_transport_error_to_vsock_error(err); | |
1188 | skerr = -err; | |
1189 | goto destroy; | |
1190 | } | |
1191 | ||
1192 | vmci_trans(vpending)->detach_sub_id = detach_sub_id; | |
1193 | ||
1194 | /* Now attach to the queue pair the client created. */ | |
1195 | handle = pkt->u.handle; | |
1196 | ||
1197 | /* vpending->local_addr always has a context id so we do not need to | |
1198 | * worry about VMADDR_CID_ANY in this case. | |
1199 | */ | |
1200 | is_local = | |
1201 | vpending->remote_addr.svm_cid == vpending->local_addr.svm_cid; | |
1202 | flags = VMCI_QPFLAG_ATTACH_ONLY; | |
1203 | flags |= is_local ? VMCI_QPFLAG_LOCAL : 0; | |
1204 | ||
1205 | err = vmci_transport_queue_pair_alloc( | |
1206 | &qpair, | |
1207 | &handle, | |
1208 | vmci_trans(vpending)->produce_size, | |
1209 | vmci_trans(vpending)->consume_size, | |
1210 | pkt->dg.src.context, | |
1211 | flags, | |
1212 | vmci_transport_is_trusted( | |
1213 | vpending, | |
1214 | vpending->remote_addr.svm_cid)); | |
1215 | if (err < 0) { | |
1216 | vmci_transport_send_reset(pending, pkt); | |
1217 | skerr = -err; | |
1218 | goto destroy; | |
1219 | } | |
1220 | ||
1221 | vmci_trans(vpending)->qp_handle = handle; | |
1222 | vmci_trans(vpending)->qpair = qpair; | |
1223 | ||
1224 | /* When we send the attach message, we must be ready to handle incoming | |
1225 | * control messages on the newly connected socket. So we move the | |
1226 | * pending socket to the connected state before sending the attach | |
1227 | * message. Otherwise, an incoming packet triggered by the attach being | |
1228 | * received by the peer may be processed concurrently with what happens | |
1229 | * below after sending the attach message, and that incoming packet | |
1230 | * will find the listening socket instead of the (currently) pending | |
1231 | * socket. Note that enqueueing the socket increments the reference | |
1232 | * count, so even if a reset comes before the connection is accepted, | |
1233 | * the socket will be valid until it is removed from the queue. | |
1234 | * | |
1235 | * If we fail sending the attach below, we remove the socket from the | |
1236 | * connected list and move the socket to SS_UNCONNECTED before | |
1237 | * releasing the lock, so a pending slow path processing of an incoming | |
1238 | * packet will not see the socket in the connected state in that case. | |
1239 | */ | |
1240 | pending->sk_state = SS_CONNECTED; | |
1241 | ||
1242 | vsock_insert_connected(vpending); | |
1243 | ||
1244 | /* Notify our peer of our attach. */ | |
1245 | err = vmci_transport_send_attach(pending, handle); | |
1246 | if (err < 0) { | |
1247 | vsock_remove_connected(vpending); | |
1248 | pr_err("Could not send attach\n"); | |
1249 | vmci_transport_send_reset(pending, pkt); | |
1250 | err = vmci_transport_error_to_vsock_error(err); | |
1251 | skerr = -err; | |
1252 | goto destroy; | |
1253 | } | |
1254 | ||
1255 | /* We have a connection. Move the now connected socket from the | |
1256 | * listener's pending list to the accept queue so callers of accept() | |
1257 | * can find it. | |
1258 | */ | |
1259 | vsock_remove_pending(listener, pending); | |
1260 | vsock_enqueue_accept(listener, pending); | |
1261 | ||
1262 | /* Callers of accept() will be be waiting on the listening socket, not | |
1263 | * the pending socket. | |
1264 | */ | |
1265 | listener->sk_state_change(listener); | |
1266 | ||
1267 | return 0; | |
1268 | ||
1269 | destroy: | |
1270 | pending->sk_err = skerr; | |
1271 | pending->sk_state = SS_UNCONNECTED; | |
1272 | /* As long as we drop our reference, all necessary cleanup will handle | |
1273 | * when the cleanup function drops its reference and our destruct | |
1274 | * implementation is called. Note that since the listen handler will | |
1275 | * remove pending from the pending list upon our failure, the cleanup | |
1276 | * function won't drop the additional reference, which is why we do it | |
1277 | * here. | |
1278 | */ | |
1279 | sock_put(pending); | |
1280 | ||
1281 | return err; | |
1282 | } | |
1283 | ||
1284 | static int | |
1285 | vmci_transport_recv_connecting_client(struct sock *sk, | |
1286 | struct vmci_transport_packet *pkt) | |
1287 | { | |
1288 | struct vsock_sock *vsk; | |
1289 | int err; | |
1290 | int skerr; | |
1291 | ||
1292 | vsk = vsock_sk(sk); | |
1293 | ||
1294 | switch (pkt->type) { | |
1295 | case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: | |
1296 | if (vmci_handle_is_invalid(pkt->u.handle) || | |
1297 | !vmci_handle_is_equal(pkt->u.handle, | |
1298 | vmci_trans(vsk)->qp_handle)) { | |
1299 | skerr = EPROTO; | |
1300 | err = -EINVAL; | |
1301 | goto destroy; | |
1302 | } | |
1303 | ||
1304 | /* Signify the socket is connected and wakeup the waiter in | |
1305 | * connect(). Also place the socket in the connected table for | |
1306 | * accounting (it can already be found since it's in the bound | |
1307 | * table). | |
1308 | */ | |
1309 | sk->sk_state = SS_CONNECTED; | |
1310 | sk->sk_socket->state = SS_CONNECTED; | |
1311 | vsock_insert_connected(vsk); | |
1312 | sk->sk_state_change(sk); | |
1313 | ||
1314 | break; | |
1315 | case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: | |
1316 | case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: | |
1317 | if (pkt->u.size == 0 | |
1318 | || pkt->dg.src.context != vsk->remote_addr.svm_cid | |
1319 | || pkt->src_port != vsk->remote_addr.svm_port | |
1320 | || !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle) | |
1321 | || vmci_trans(vsk)->qpair | |
1322 | || vmci_trans(vsk)->produce_size != 0 | |
1323 | || vmci_trans(vsk)->consume_size != 0 | |
1324 | || vmci_trans(vsk)->attach_sub_id != VMCI_INVALID_ID | |
1325 | || vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) { | |
1326 | skerr = EPROTO; | |
1327 | err = -EINVAL; | |
1328 | ||
1329 | goto destroy; | |
1330 | } | |
1331 | ||
1332 | err = vmci_transport_recv_connecting_client_negotiate(sk, pkt); | |
1333 | if (err) { | |
1334 | skerr = -err; | |
1335 | goto destroy; | |
1336 | } | |
1337 | ||
1338 | break; | |
1339 | case VMCI_TRANSPORT_PACKET_TYPE_INVALID: | |
1340 | err = vmci_transport_recv_connecting_client_invalid(sk, pkt); | |
1341 | if (err) { | |
1342 | skerr = -err; | |
1343 | goto destroy; | |
1344 | } | |
1345 | ||
1346 | break; | |
1347 | case VMCI_TRANSPORT_PACKET_TYPE_RST: | |
1348 | /* Older versions of the linux code (WS 6.5 / ESX 4.0) used to | |
1349 | * continue processing here after they sent an INVALID packet. | |
1350 | * This meant that we got a RST after the INVALID. We ignore a | |
1351 | * RST after an INVALID. The common code doesn't send the RST | |
1352 | * ... so we can hang if an old version of the common code | |
1353 | * fails between getting a REQUEST and sending an OFFER back. | |
1354 | * Not much we can do about it... except hope that it doesn't | |
1355 | * happen. | |
1356 | */ | |
1357 | if (vsk->ignore_connecting_rst) { | |
1358 | vsk->ignore_connecting_rst = false; | |
1359 | } else { | |
1360 | skerr = ECONNRESET; | |
1361 | err = 0; | |
1362 | goto destroy; | |
1363 | } | |
1364 | ||
1365 | break; | |
1366 | default: | |
1367 | /* Close and cleanup the connection. */ | |
1368 | skerr = EPROTO; | |
1369 | err = -EINVAL; | |
1370 | goto destroy; | |
1371 | } | |
1372 | ||
1373 | return 0; | |
1374 | ||
1375 | destroy: | |
1376 | vmci_transport_send_reset(sk, pkt); | |
1377 | ||
1378 | sk->sk_state = SS_UNCONNECTED; | |
1379 | sk->sk_err = skerr; | |
1380 | sk->sk_error_report(sk); | |
1381 | return err; | |
1382 | } | |
1383 | ||
1384 | static int vmci_transport_recv_connecting_client_negotiate( | |
1385 | struct sock *sk, | |
1386 | struct vmci_transport_packet *pkt) | |
1387 | { | |
1388 | int err; | |
1389 | struct vsock_sock *vsk; | |
1390 | struct vmci_handle handle; | |
1391 | struct vmci_qp *qpair; | |
1392 | u32 attach_sub_id; | |
1393 | u32 detach_sub_id; | |
1394 | bool is_local; | |
1395 | u32 flags; | |
1396 | bool old_proto = true; | |
1397 | bool old_pkt_proto; | |
1398 | u16 version; | |
1399 | ||
1400 | vsk = vsock_sk(sk); | |
1401 | handle = VMCI_INVALID_HANDLE; | |
1402 | attach_sub_id = VMCI_INVALID_ID; | |
1403 | detach_sub_id = VMCI_INVALID_ID; | |
1404 | ||
1405 | /* If we have gotten here then we should be past the point where old | |
1406 | * linux vsock could have sent the bogus rst. | |
1407 | */ | |
1408 | vsk->sent_request = false; | |
1409 | vsk->ignore_connecting_rst = false; | |
1410 | ||
1411 | /* Verify that we're OK with the proposed queue pair size */ | |
1412 | if (pkt->u.size < vmci_trans(vsk)->queue_pair_min_size || | |
1413 | pkt->u.size > vmci_trans(vsk)->queue_pair_max_size) { | |
1414 | err = -EINVAL; | |
1415 | goto destroy; | |
1416 | } | |
1417 | ||
1418 | /* At this point we know the CID the peer is using to talk to us. */ | |
1419 | ||
1420 | if (vsk->local_addr.svm_cid == VMADDR_CID_ANY) | |
1421 | vsk->local_addr.svm_cid = pkt->dg.dst.context; | |
1422 | ||
1423 | /* Setup the notify ops to be the highest supported version that both | |
1424 | * the server and the client support. | |
1425 | */ | |
1426 | ||
1427 | if (vmci_transport_old_proto_override(&old_pkt_proto)) { | |
1428 | old_proto = old_pkt_proto; | |
1429 | } else { | |
1430 | if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE) | |
1431 | old_proto = true; | |
1432 | else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2) | |
1433 | old_proto = false; | |
1434 | ||
1435 | } | |
1436 | ||
1437 | if (old_proto) | |
1438 | version = VSOCK_PROTO_INVALID; | |
1439 | else | |
1440 | version = pkt->proto; | |
1441 | ||
1442 | if (!vmci_transport_proto_to_notify_struct(sk, &version, old_proto)) { | |
1443 | err = -EINVAL; | |
1444 | goto destroy; | |
1445 | } | |
1446 | ||
1447 | /* Subscribe to attach and detach events first. | |
1448 | * | |
1449 | * XXX We attach once for each queue pair created for now so it is easy | |
1450 | * to find the socket (it's provided), but later we should only | |
1451 | * subscribe once and add a way to lookup sockets by queue pair handle. | |
1452 | */ | |
1453 | err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_ATTACH, | |
1454 | vmci_transport_peer_attach_cb, | |
1455 | sk, &attach_sub_id); | |
1456 | if (err < VMCI_SUCCESS) { | |
1457 | err = vmci_transport_error_to_vsock_error(err); | |
1458 | goto destroy; | |
1459 | } | |
1460 | ||
1461 | err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, | |
1462 | vmci_transport_peer_detach_cb, | |
1463 | sk, &detach_sub_id); | |
1464 | if (err < VMCI_SUCCESS) { | |
1465 | err = vmci_transport_error_to_vsock_error(err); | |
1466 | goto destroy; | |
1467 | } | |
1468 | ||
1469 | /* Make VMCI select the handle for us. */ | |
1470 | handle = VMCI_INVALID_HANDLE; | |
1471 | is_local = vsk->remote_addr.svm_cid == vsk->local_addr.svm_cid; | |
1472 | flags = is_local ? VMCI_QPFLAG_LOCAL : 0; | |
1473 | ||
1474 | err = vmci_transport_queue_pair_alloc(&qpair, | |
1475 | &handle, | |
1476 | pkt->u.size, | |
1477 | pkt->u.size, | |
1478 | vsk->remote_addr.svm_cid, | |
1479 | flags, | |
1480 | vmci_transport_is_trusted( | |
1481 | vsk, | |
1482 | vsk-> | |
1483 | remote_addr.svm_cid)); | |
1484 | if (err < 0) | |
1485 | goto destroy; | |
1486 | ||
1487 | err = vmci_transport_send_qp_offer(sk, handle); | |
1488 | if (err < 0) { | |
1489 | err = vmci_transport_error_to_vsock_error(err); | |
1490 | goto destroy; | |
1491 | } | |
1492 | ||
1493 | vmci_trans(vsk)->qp_handle = handle; | |
1494 | vmci_trans(vsk)->qpair = qpair; | |
1495 | ||
1496 | vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = | |
1497 | pkt->u.size; | |
1498 | ||
1499 | vmci_trans(vsk)->attach_sub_id = attach_sub_id; | |
1500 | vmci_trans(vsk)->detach_sub_id = detach_sub_id; | |
1501 | ||
1502 | vmci_trans(vsk)->notify_ops->process_negotiate(sk); | |
1503 | ||
1504 | return 0; | |
1505 | ||
1506 | destroy: | |
1507 | if (attach_sub_id != VMCI_INVALID_ID) | |
1508 | vmci_event_unsubscribe(attach_sub_id); | |
1509 | ||
1510 | if (detach_sub_id != VMCI_INVALID_ID) | |
1511 | vmci_event_unsubscribe(detach_sub_id); | |
1512 | ||
1513 | if (!vmci_handle_is_invalid(handle)) | |
1514 | vmci_qpair_detach(&qpair); | |
1515 | ||
1516 | return err; | |
1517 | } | |
1518 | ||
1519 | static int | |
1520 | vmci_transport_recv_connecting_client_invalid(struct sock *sk, | |
1521 | struct vmci_transport_packet *pkt) | |
1522 | { | |
1523 | int err = 0; | |
1524 | struct vsock_sock *vsk = vsock_sk(sk); | |
1525 | ||
1526 | if (vsk->sent_request) { | |
1527 | vsk->sent_request = false; | |
1528 | vsk->ignore_connecting_rst = true; | |
1529 | ||
1530 | err = vmci_transport_send_conn_request( | |
1531 | sk, vmci_trans(vsk)->queue_pair_size); | |
1532 | if (err < 0) | |
1533 | err = vmci_transport_error_to_vsock_error(err); | |
1534 | else | |
1535 | err = 0; | |
1536 | ||
1537 | } | |
1538 | ||
1539 | return err; | |
1540 | } | |
1541 | ||
1542 | static int vmci_transport_recv_connected(struct sock *sk, | |
1543 | struct vmci_transport_packet *pkt) | |
1544 | { | |
1545 | struct vsock_sock *vsk; | |
1546 | bool pkt_processed = false; | |
1547 | ||
1548 | /* In cases where we are closing the connection, it's sufficient to | |
1549 | * mark the state change (and maybe error) and wake up any waiting | |
1550 | * threads. Since this is a connected socket, it's owned by a user | |
1551 | * process and will be cleaned up when the failure is passed back on | |
1552 | * the current or next system call. Our system call implementations | |
1553 | * must therefore check for error and state changes on entry and when | |
1554 | * being awoken. | |
1555 | */ | |
1556 | switch (pkt->type) { | |
1557 | case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: | |
1558 | if (pkt->u.mode) { | |
1559 | vsk = vsock_sk(sk); | |
1560 | ||
1561 | vsk->peer_shutdown |= pkt->u.mode; | |
1562 | sk->sk_state_change(sk); | |
1563 | } | |
1564 | break; | |
1565 | ||
1566 | case VMCI_TRANSPORT_PACKET_TYPE_RST: | |
1567 | vsk = vsock_sk(sk); | |
1568 | /* It is possible that we sent our peer a message (e.g a | |
1569 | * WAITING_READ) right before we got notified that the peer had | |
1570 | * detached. If that happens then we can get a RST pkt back | |
1571 | * from our peer even though there is data available for us to | |
1572 | * read. In that case, don't shutdown the socket completely but | |
1573 | * instead allow the local client to finish reading data off | |
1574 | * the queuepair. Always treat a RST pkt in connected mode like | |
1575 | * a clean shutdown. | |
1576 | */ | |
1577 | sock_set_flag(sk, SOCK_DONE); | |
1578 | vsk->peer_shutdown = SHUTDOWN_MASK; | |
1579 | if (vsock_stream_has_data(vsk) <= 0) | |
1580 | sk->sk_state = SS_DISCONNECTING; | |
1581 | ||
1582 | sk->sk_state_change(sk); | |
1583 | break; | |
1584 | ||
1585 | default: | |
1586 | vsk = vsock_sk(sk); | |
1587 | vmci_trans(vsk)->notify_ops->handle_notify_pkt( | |
1588 | sk, pkt, false, NULL, NULL, | |
1589 | &pkt_processed); | |
1590 | if (!pkt_processed) | |
1591 | return -EINVAL; | |
1592 | ||
1593 | break; | |
1594 | } | |
1595 | ||
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | static int vmci_transport_socket_init(struct vsock_sock *vsk, | |
1600 | struct vsock_sock *psk) | |
1601 | { | |
1602 | vsk->trans = kmalloc(sizeof(struct vmci_transport), GFP_KERNEL); | |
1603 | if (!vsk->trans) | |
1604 | return -ENOMEM; | |
1605 | ||
1606 | vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; | |
1607 | vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE; | |
1608 | vmci_trans(vsk)->qpair = NULL; | |
1609 | vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = 0; | |
1610 | vmci_trans(vsk)->attach_sub_id = vmci_trans(vsk)->detach_sub_id = | |
1611 | VMCI_INVALID_ID; | |
1612 | vmci_trans(vsk)->notify_ops = NULL; | |
1613 | if (psk) { | |
1614 | vmci_trans(vsk)->queue_pair_size = | |
1615 | vmci_trans(psk)->queue_pair_size; | |
1616 | vmci_trans(vsk)->queue_pair_min_size = | |
1617 | vmci_trans(psk)->queue_pair_min_size; | |
1618 | vmci_trans(vsk)->queue_pair_max_size = | |
1619 | vmci_trans(psk)->queue_pair_max_size; | |
1620 | } else { | |
1621 | vmci_trans(vsk)->queue_pair_size = | |
1622 | VMCI_TRANSPORT_DEFAULT_QP_SIZE; | |
1623 | vmci_trans(vsk)->queue_pair_min_size = | |
1624 | VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN; | |
1625 | vmci_trans(vsk)->queue_pair_max_size = | |
1626 | VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX; | |
1627 | } | |
1628 | ||
1629 | return 0; | |
1630 | } | |
1631 | ||
1632 | static void vmci_transport_destruct(struct vsock_sock *vsk) | |
1633 | { | |
1634 | if (vmci_trans(vsk)->attach_sub_id != VMCI_INVALID_ID) { | |
1635 | vmci_event_unsubscribe(vmci_trans(vsk)->attach_sub_id); | |
1636 | vmci_trans(vsk)->attach_sub_id = VMCI_INVALID_ID; | |
1637 | } | |
1638 | ||
1639 | if (vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) { | |
1640 | vmci_event_unsubscribe(vmci_trans(vsk)->detach_sub_id); | |
1641 | vmci_trans(vsk)->detach_sub_id = VMCI_INVALID_ID; | |
1642 | } | |
1643 | ||
1644 | if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) { | |
1645 | vmci_qpair_detach(&vmci_trans(vsk)->qpair); | |
1646 | vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE; | |
1647 | vmci_trans(vsk)->produce_size = 0; | |
1648 | vmci_trans(vsk)->consume_size = 0; | |
1649 | } | |
1650 | ||
1651 | if (vmci_trans(vsk)->notify_ops) | |
1652 | vmci_trans(vsk)->notify_ops->socket_destruct(vsk); | |
1653 | ||
1654 | kfree(vsk->trans); | |
1655 | vsk->trans = NULL; | |
1656 | } | |
1657 | ||
1658 | static void vmci_transport_release(struct vsock_sock *vsk) | |
1659 | { | |
1660 | if (!vmci_handle_is_invalid(vmci_trans(vsk)->dg_handle)) { | |
1661 | vmci_datagram_destroy_handle(vmci_trans(vsk)->dg_handle); | |
1662 | vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; | |
1663 | } | |
1664 | } | |
1665 | ||
1666 | static int vmci_transport_dgram_bind(struct vsock_sock *vsk, | |
1667 | struct sockaddr_vm *addr) | |
1668 | { | |
1669 | u32 port; | |
1670 | u32 flags; | |
1671 | int err; | |
1672 | ||
1673 | /* VMCI will select a resource ID for us if we provide | |
1674 | * VMCI_INVALID_ID. | |
1675 | */ | |
1676 | port = addr->svm_port == VMADDR_PORT_ANY ? | |
1677 | VMCI_INVALID_ID : addr->svm_port; | |
1678 | ||
1679 | if (port <= LAST_RESERVED_PORT && !capable(CAP_NET_BIND_SERVICE)) | |
1680 | return -EACCES; | |
1681 | ||
1682 | flags = addr->svm_cid == VMADDR_CID_ANY ? | |
1683 | VMCI_FLAG_ANYCID_DG_HND : 0; | |
1684 | ||
1685 | err = vmci_transport_datagram_create_hnd(port, flags, | |
1686 | vmci_transport_recv_dgram_cb, | |
1687 | &vsk->sk, | |
1688 | &vmci_trans(vsk)->dg_handle); | |
1689 | if (err < VMCI_SUCCESS) | |
1690 | return vmci_transport_error_to_vsock_error(err); | |
1691 | vsock_addr_init(&vsk->local_addr, addr->svm_cid, | |
1692 | vmci_trans(vsk)->dg_handle.resource); | |
1693 | ||
1694 | return 0; | |
1695 | } | |
1696 | ||
1697 | static int vmci_transport_dgram_enqueue( | |
1698 | struct vsock_sock *vsk, | |
1699 | struct sockaddr_vm *remote_addr, | |
1700 | struct iovec *iov, | |
1701 | size_t len) | |
1702 | { | |
1703 | int err; | |
1704 | struct vmci_datagram *dg; | |
1705 | ||
1706 | if (len > VMCI_MAX_DG_PAYLOAD_SIZE) | |
1707 | return -EMSGSIZE; | |
1708 | ||
1709 | if (!vmci_transport_allow_dgram(vsk, remote_addr->svm_cid)) | |
1710 | return -EPERM; | |
1711 | ||
1712 | /* Allocate a buffer for the user's message and our packet header. */ | |
1713 | dg = kmalloc(len + sizeof(*dg), GFP_KERNEL); | |
1714 | if (!dg) | |
1715 | return -ENOMEM; | |
1716 | ||
1717 | memcpy_fromiovec(VMCI_DG_PAYLOAD(dg), iov, len); | |
1718 | ||
1719 | dg->dst = vmci_make_handle(remote_addr->svm_cid, | |
1720 | remote_addr->svm_port); | |
1721 | dg->src = vmci_make_handle(vsk->local_addr.svm_cid, | |
1722 | vsk->local_addr.svm_port); | |
1723 | dg->payload_size = len; | |
1724 | ||
1725 | err = vmci_datagram_send(dg); | |
1726 | kfree(dg); | |
1727 | if (err < 0) | |
1728 | return vmci_transport_error_to_vsock_error(err); | |
1729 | ||
1730 | return err - sizeof(*dg); | |
1731 | } | |
1732 | ||
1733 | static int vmci_transport_dgram_dequeue(struct kiocb *kiocb, | |
1734 | struct vsock_sock *vsk, | |
1735 | struct msghdr *msg, size_t len, | |
1736 | int flags) | |
1737 | { | |
1738 | int err; | |
1739 | int noblock; | |
1740 | struct vmci_datagram *dg; | |
1741 | size_t payload_len; | |
1742 | struct sk_buff *skb; | |
1743 | ||
1744 | noblock = flags & MSG_DONTWAIT; | |
1745 | ||
1746 | if (flags & MSG_OOB || flags & MSG_ERRQUEUE) | |
1747 | return -EOPNOTSUPP; | |
1748 | ||
680d04e0 MK |
1749 | msg->msg_namelen = 0; |
1750 | ||
d021c344 AK |
1751 | /* Retrieve the head sk_buff from the socket's receive queue. */ |
1752 | err = 0; | |
1753 | skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err); | |
1754 | if (err) | |
1755 | return err; | |
1756 | ||
1757 | if (!skb) | |
1758 | return -EAGAIN; | |
1759 | ||
1760 | dg = (struct vmci_datagram *)skb->data; | |
1761 | if (!dg) | |
1762 | /* err is 0, meaning we read zero bytes. */ | |
1763 | goto out; | |
1764 | ||
1765 | payload_len = dg->payload_size; | |
1766 | /* Ensure the sk_buff matches the payload size claimed in the packet. */ | |
1767 | if (payload_len != skb->len - sizeof(*dg)) { | |
1768 | err = -EINVAL; | |
1769 | goto out; | |
1770 | } | |
1771 | ||
1772 | if (payload_len > len) { | |
1773 | payload_len = len; | |
1774 | msg->msg_flags |= MSG_TRUNC; | |
1775 | } | |
1776 | ||
1777 | /* Place the datagram payload in the user's iovec. */ | |
1778 | err = skb_copy_datagram_iovec(skb, sizeof(*dg), msg->msg_iov, | |
1779 | payload_len); | |
1780 | if (err) | |
1781 | goto out; | |
1782 | ||
d021c344 AK |
1783 | if (msg->msg_name) { |
1784 | struct sockaddr_vm *vm_addr; | |
1785 | ||
1786 | /* Provide the address of the sender. */ | |
1787 | vm_addr = (struct sockaddr_vm *)msg->msg_name; | |
1788 | vsock_addr_init(vm_addr, dg->src.context, dg->src.resource); | |
1789 | msg->msg_namelen = sizeof(*vm_addr); | |
1790 | } | |
1791 | err = payload_len; | |
1792 | ||
1793 | out: | |
1794 | skb_free_datagram(&vsk->sk, skb); | |
1795 | return err; | |
1796 | } | |
1797 | ||
1798 | static bool vmci_transport_dgram_allow(u32 cid, u32 port) | |
1799 | { | |
1800 | if (cid == VMADDR_CID_HYPERVISOR) { | |
1801 | /* Registrations of PBRPC Servers do not modify VMX/Hypervisor | |
1802 | * state and are allowed. | |
1803 | */ | |
1804 | return port == VMCI_UNITY_PBRPC_REGISTER; | |
1805 | } | |
1806 | ||
1807 | return true; | |
1808 | } | |
1809 | ||
1810 | static int vmci_transport_connect(struct vsock_sock *vsk) | |
1811 | { | |
1812 | int err; | |
1813 | bool old_pkt_proto = false; | |
1814 | struct sock *sk = &vsk->sk; | |
1815 | ||
1816 | if (vmci_transport_old_proto_override(&old_pkt_proto) && | |
1817 | old_pkt_proto) { | |
1818 | err = vmci_transport_send_conn_request( | |
1819 | sk, vmci_trans(vsk)->queue_pair_size); | |
1820 | if (err < 0) { | |
1821 | sk->sk_state = SS_UNCONNECTED; | |
1822 | return err; | |
1823 | } | |
1824 | } else { | |
1825 | int supported_proto_versions = | |
1826 | vmci_transport_new_proto_supported_versions(); | |
1827 | err = vmci_transport_send_conn_request2( | |
1828 | sk, vmci_trans(vsk)->queue_pair_size, | |
1829 | supported_proto_versions); | |
1830 | if (err < 0) { | |
1831 | sk->sk_state = SS_UNCONNECTED; | |
1832 | return err; | |
1833 | } | |
1834 | ||
1835 | vsk->sent_request = true; | |
1836 | } | |
1837 | ||
1838 | return err; | |
1839 | } | |
1840 | ||
1841 | static ssize_t vmci_transport_stream_dequeue( | |
1842 | struct vsock_sock *vsk, | |
1843 | struct iovec *iov, | |
1844 | size_t len, | |
1845 | int flags) | |
1846 | { | |
1847 | if (flags & MSG_PEEK) | |
1848 | return vmci_qpair_peekv(vmci_trans(vsk)->qpair, iov, len, 0); | |
1849 | else | |
1850 | return vmci_qpair_dequev(vmci_trans(vsk)->qpair, iov, len, 0); | |
1851 | } | |
1852 | ||
1853 | static ssize_t vmci_transport_stream_enqueue( | |
1854 | struct vsock_sock *vsk, | |
1855 | struct iovec *iov, | |
1856 | size_t len) | |
1857 | { | |
1858 | return vmci_qpair_enquev(vmci_trans(vsk)->qpair, iov, len, 0); | |
1859 | } | |
1860 | ||
1861 | static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk) | |
1862 | { | |
1863 | return vmci_qpair_consume_buf_ready(vmci_trans(vsk)->qpair); | |
1864 | } | |
1865 | ||
1866 | static s64 vmci_transport_stream_has_space(struct vsock_sock *vsk) | |
1867 | { | |
1868 | return vmci_qpair_produce_free_space(vmci_trans(vsk)->qpair); | |
1869 | } | |
1870 | ||
1871 | static u64 vmci_transport_stream_rcvhiwat(struct vsock_sock *vsk) | |
1872 | { | |
1873 | return vmci_trans(vsk)->consume_size; | |
1874 | } | |
1875 | ||
1876 | static bool vmci_transport_stream_is_active(struct vsock_sock *vsk) | |
1877 | { | |
1878 | return !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle); | |
1879 | } | |
1880 | ||
1881 | static u64 vmci_transport_get_buffer_size(struct vsock_sock *vsk) | |
1882 | { | |
1883 | return vmci_trans(vsk)->queue_pair_size; | |
1884 | } | |
1885 | ||
1886 | static u64 vmci_transport_get_min_buffer_size(struct vsock_sock *vsk) | |
1887 | { | |
1888 | return vmci_trans(vsk)->queue_pair_min_size; | |
1889 | } | |
1890 | ||
1891 | static u64 vmci_transport_get_max_buffer_size(struct vsock_sock *vsk) | |
1892 | { | |
1893 | return vmci_trans(vsk)->queue_pair_max_size; | |
1894 | } | |
1895 | ||
1896 | static void vmci_transport_set_buffer_size(struct vsock_sock *vsk, u64 val) | |
1897 | { | |
1898 | if (val < vmci_trans(vsk)->queue_pair_min_size) | |
1899 | vmci_trans(vsk)->queue_pair_min_size = val; | |
1900 | if (val > vmci_trans(vsk)->queue_pair_max_size) | |
1901 | vmci_trans(vsk)->queue_pair_max_size = val; | |
1902 | vmci_trans(vsk)->queue_pair_size = val; | |
1903 | } | |
1904 | ||
1905 | static void vmci_transport_set_min_buffer_size(struct vsock_sock *vsk, | |
1906 | u64 val) | |
1907 | { | |
1908 | if (val > vmci_trans(vsk)->queue_pair_size) | |
1909 | vmci_trans(vsk)->queue_pair_size = val; | |
1910 | vmci_trans(vsk)->queue_pair_min_size = val; | |
1911 | } | |
1912 | ||
1913 | static void vmci_transport_set_max_buffer_size(struct vsock_sock *vsk, | |
1914 | u64 val) | |
1915 | { | |
1916 | if (val < vmci_trans(vsk)->queue_pair_size) | |
1917 | vmci_trans(vsk)->queue_pair_size = val; | |
1918 | vmci_trans(vsk)->queue_pair_max_size = val; | |
1919 | } | |
1920 | ||
1921 | static int vmci_transport_notify_poll_in( | |
1922 | struct vsock_sock *vsk, | |
1923 | size_t target, | |
1924 | bool *data_ready_now) | |
1925 | { | |
1926 | return vmci_trans(vsk)->notify_ops->poll_in( | |
1927 | &vsk->sk, target, data_ready_now); | |
1928 | } | |
1929 | ||
1930 | static int vmci_transport_notify_poll_out( | |
1931 | struct vsock_sock *vsk, | |
1932 | size_t target, | |
1933 | bool *space_available_now) | |
1934 | { | |
1935 | return vmci_trans(vsk)->notify_ops->poll_out( | |
1936 | &vsk->sk, target, space_available_now); | |
1937 | } | |
1938 | ||
1939 | static int vmci_transport_notify_recv_init( | |
1940 | struct vsock_sock *vsk, | |
1941 | size_t target, | |
1942 | struct vsock_transport_recv_notify_data *data) | |
1943 | { | |
1944 | return vmci_trans(vsk)->notify_ops->recv_init( | |
1945 | &vsk->sk, target, | |
1946 | (struct vmci_transport_recv_notify_data *)data); | |
1947 | } | |
1948 | ||
1949 | static int vmci_transport_notify_recv_pre_block( | |
1950 | struct vsock_sock *vsk, | |
1951 | size_t target, | |
1952 | struct vsock_transport_recv_notify_data *data) | |
1953 | { | |
1954 | return vmci_trans(vsk)->notify_ops->recv_pre_block( | |
1955 | &vsk->sk, target, | |
1956 | (struct vmci_transport_recv_notify_data *)data); | |
1957 | } | |
1958 | ||
1959 | static int vmci_transport_notify_recv_pre_dequeue( | |
1960 | struct vsock_sock *vsk, | |
1961 | size_t target, | |
1962 | struct vsock_transport_recv_notify_data *data) | |
1963 | { | |
1964 | return vmci_trans(vsk)->notify_ops->recv_pre_dequeue( | |
1965 | &vsk->sk, target, | |
1966 | (struct vmci_transport_recv_notify_data *)data); | |
1967 | } | |
1968 | ||
1969 | static int vmci_transport_notify_recv_post_dequeue( | |
1970 | struct vsock_sock *vsk, | |
1971 | size_t target, | |
1972 | ssize_t copied, | |
1973 | bool data_read, | |
1974 | struct vsock_transport_recv_notify_data *data) | |
1975 | { | |
1976 | return vmci_trans(vsk)->notify_ops->recv_post_dequeue( | |
1977 | &vsk->sk, target, copied, data_read, | |
1978 | (struct vmci_transport_recv_notify_data *)data); | |
1979 | } | |
1980 | ||
1981 | static int vmci_transport_notify_send_init( | |
1982 | struct vsock_sock *vsk, | |
1983 | struct vsock_transport_send_notify_data *data) | |
1984 | { | |
1985 | return vmci_trans(vsk)->notify_ops->send_init( | |
1986 | &vsk->sk, | |
1987 | (struct vmci_transport_send_notify_data *)data); | |
1988 | } | |
1989 | ||
1990 | static int vmci_transport_notify_send_pre_block( | |
1991 | struct vsock_sock *vsk, | |
1992 | struct vsock_transport_send_notify_data *data) | |
1993 | { | |
1994 | return vmci_trans(vsk)->notify_ops->send_pre_block( | |
1995 | &vsk->sk, | |
1996 | (struct vmci_transport_send_notify_data *)data); | |
1997 | } | |
1998 | ||
1999 | static int vmci_transport_notify_send_pre_enqueue( | |
2000 | struct vsock_sock *vsk, | |
2001 | struct vsock_transport_send_notify_data *data) | |
2002 | { | |
2003 | return vmci_trans(vsk)->notify_ops->send_pre_enqueue( | |
2004 | &vsk->sk, | |
2005 | (struct vmci_transport_send_notify_data *)data); | |
2006 | } | |
2007 | ||
2008 | static int vmci_transport_notify_send_post_enqueue( | |
2009 | struct vsock_sock *vsk, | |
2010 | ssize_t written, | |
2011 | struct vsock_transport_send_notify_data *data) | |
2012 | { | |
2013 | return vmci_trans(vsk)->notify_ops->send_post_enqueue( | |
2014 | &vsk->sk, written, | |
2015 | (struct vmci_transport_send_notify_data *)data); | |
2016 | } | |
2017 | ||
2018 | static bool vmci_transport_old_proto_override(bool *old_pkt_proto) | |
2019 | { | |
2020 | if (PROTOCOL_OVERRIDE != -1) { | |
2021 | if (PROTOCOL_OVERRIDE == 0) | |
2022 | *old_pkt_proto = true; | |
2023 | else | |
2024 | *old_pkt_proto = false; | |
2025 | ||
2026 | pr_info("Proto override in use\n"); | |
2027 | return true; | |
2028 | } | |
2029 | ||
2030 | return false; | |
2031 | } | |
2032 | ||
2033 | static bool vmci_transport_proto_to_notify_struct(struct sock *sk, | |
2034 | u16 *proto, | |
2035 | bool old_pkt_proto) | |
2036 | { | |
2037 | struct vsock_sock *vsk = vsock_sk(sk); | |
2038 | ||
2039 | if (old_pkt_proto) { | |
2040 | if (*proto != VSOCK_PROTO_INVALID) { | |
2041 | pr_err("Can't set both an old and new protocol\n"); | |
2042 | return false; | |
2043 | } | |
2044 | vmci_trans(vsk)->notify_ops = &vmci_transport_notify_pkt_ops; | |
2045 | goto exit; | |
2046 | } | |
2047 | ||
2048 | switch (*proto) { | |
2049 | case VSOCK_PROTO_PKT_ON_NOTIFY: | |
2050 | vmci_trans(vsk)->notify_ops = | |
2051 | &vmci_transport_notify_pkt_q_state_ops; | |
2052 | break; | |
2053 | default: | |
2054 | pr_err("Unknown notify protocol version\n"); | |
2055 | return false; | |
2056 | } | |
2057 | ||
2058 | exit: | |
2059 | vmci_trans(vsk)->notify_ops->socket_init(sk); | |
2060 | return true; | |
2061 | } | |
2062 | ||
2063 | static u16 vmci_transport_new_proto_supported_versions(void) | |
2064 | { | |
2065 | if (PROTOCOL_OVERRIDE != -1) | |
2066 | return PROTOCOL_OVERRIDE; | |
2067 | ||
2068 | return VSOCK_PROTO_ALL_SUPPORTED; | |
2069 | } | |
2070 | ||
2071 | static u32 vmci_transport_get_local_cid(void) | |
2072 | { | |
2073 | return vmci_get_context_id(); | |
2074 | } | |
2075 | ||
2076 | static struct vsock_transport vmci_transport = { | |
2077 | .init = vmci_transport_socket_init, | |
2078 | .destruct = vmci_transport_destruct, | |
2079 | .release = vmci_transport_release, | |
2080 | .connect = vmci_transport_connect, | |
2081 | .dgram_bind = vmci_transport_dgram_bind, | |
2082 | .dgram_dequeue = vmci_transport_dgram_dequeue, | |
2083 | .dgram_enqueue = vmci_transport_dgram_enqueue, | |
2084 | .dgram_allow = vmci_transport_dgram_allow, | |
2085 | .stream_dequeue = vmci_transport_stream_dequeue, | |
2086 | .stream_enqueue = vmci_transport_stream_enqueue, | |
2087 | .stream_has_data = vmci_transport_stream_has_data, | |
2088 | .stream_has_space = vmci_transport_stream_has_space, | |
2089 | .stream_rcvhiwat = vmci_transport_stream_rcvhiwat, | |
2090 | .stream_is_active = vmci_transport_stream_is_active, | |
2091 | .stream_allow = vmci_transport_stream_allow, | |
2092 | .notify_poll_in = vmci_transport_notify_poll_in, | |
2093 | .notify_poll_out = vmci_transport_notify_poll_out, | |
2094 | .notify_recv_init = vmci_transport_notify_recv_init, | |
2095 | .notify_recv_pre_block = vmci_transport_notify_recv_pre_block, | |
2096 | .notify_recv_pre_dequeue = vmci_transport_notify_recv_pre_dequeue, | |
2097 | .notify_recv_post_dequeue = vmci_transport_notify_recv_post_dequeue, | |
2098 | .notify_send_init = vmci_transport_notify_send_init, | |
2099 | .notify_send_pre_block = vmci_transport_notify_send_pre_block, | |
2100 | .notify_send_pre_enqueue = vmci_transport_notify_send_pre_enqueue, | |
2101 | .notify_send_post_enqueue = vmci_transport_notify_send_post_enqueue, | |
2102 | .shutdown = vmci_transport_shutdown, | |
2103 | .set_buffer_size = vmci_transport_set_buffer_size, | |
2104 | .set_min_buffer_size = vmci_transport_set_min_buffer_size, | |
2105 | .set_max_buffer_size = vmci_transport_set_max_buffer_size, | |
2106 | .get_buffer_size = vmci_transport_get_buffer_size, | |
2107 | .get_min_buffer_size = vmci_transport_get_min_buffer_size, | |
2108 | .get_max_buffer_size = vmci_transport_get_max_buffer_size, | |
2109 | .get_local_cid = vmci_transport_get_local_cid, | |
2110 | }; | |
2111 | ||
2112 | static int __init vmci_transport_init(void) | |
2113 | { | |
2114 | int err; | |
2115 | ||
2116 | /* Create the datagram handle that we will use to send and receive all | |
2117 | * VSocket control messages for this context. | |
2118 | */ | |
2119 | err = vmci_transport_datagram_create_hnd(VMCI_TRANSPORT_PACKET_RID, | |
2120 | VMCI_FLAG_ANYCID_DG_HND, | |
2121 | vmci_transport_recv_stream_cb, | |
2122 | NULL, | |
2123 | &vmci_transport_stream_handle); | |
2124 | if (err < VMCI_SUCCESS) { | |
2125 | pr_err("Unable to create datagram handle. (%d)\n", err); | |
2126 | return vmci_transport_error_to_vsock_error(err); | |
2127 | } | |
2128 | ||
2129 | err = vmci_event_subscribe(VMCI_EVENT_QP_RESUMED, | |
2130 | vmci_transport_qp_resumed_cb, | |
2131 | NULL, &vmci_transport_qp_resumed_sub_id); | |
2132 | if (err < VMCI_SUCCESS) { | |
2133 | pr_err("Unable to subscribe to resumed event. (%d)\n", err); | |
2134 | err = vmci_transport_error_to_vsock_error(err); | |
2135 | vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; | |
2136 | goto err_destroy_stream_handle; | |
2137 | } | |
2138 | ||
2139 | err = vsock_core_init(&vmci_transport); | |
2140 | if (err < 0) | |
2141 | goto err_unsubscribe; | |
2142 | ||
2143 | return 0; | |
2144 | ||
2145 | err_unsubscribe: | |
2146 | vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); | |
2147 | err_destroy_stream_handle: | |
2148 | vmci_datagram_destroy_handle(vmci_transport_stream_handle); | |
2149 | return err; | |
2150 | } | |
2151 | module_init(vmci_transport_init); | |
2152 | ||
2153 | static void __exit vmci_transport_exit(void) | |
2154 | { | |
2155 | if (!vmci_handle_is_invalid(vmci_transport_stream_handle)) { | |
2156 | if (vmci_datagram_destroy_handle( | |
2157 | vmci_transport_stream_handle) != VMCI_SUCCESS) | |
2158 | pr_err("Couldn't destroy datagram handle\n"); | |
2159 | vmci_transport_stream_handle = VMCI_INVALID_HANDLE; | |
2160 | } | |
2161 | ||
2162 | if (vmci_transport_qp_resumed_sub_id != VMCI_INVALID_ID) { | |
2163 | vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); | |
2164 | vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; | |
2165 | } | |
2166 | ||
2167 | vsock_core_exit(); | |
2168 | } | |
2169 | module_exit(vmci_transport_exit); | |
2170 | ||
2171 | MODULE_AUTHOR("VMware, Inc."); | |
2172 | MODULE_DESCRIPTION("VMCI transport for Virtual Sockets"); | |
2173 | MODULE_LICENSE("GPL v2"); | |
2174 | MODULE_ALIAS("vmware_vsock"); | |
2175 | MODULE_ALIAS_NETPROTO(PF_VSOCK); |