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08e0e7c8 DH |
1 | /* Maintain an RxRPC server socket to do AFS communications through |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <net/sock.h> | |
13 | #include <net/af_rxrpc.h> | |
14 | #include <rxrpc/packet.h> | |
15 | #include "internal.h" | |
16 | #include "afs_cm.h" | |
17 | ||
18 | static struct socket *afs_socket; /* my RxRPC socket */ | |
19 | static struct workqueue_struct *afs_async_calls; | |
00d3b7a4 DH |
20 | static atomic_t afs_outstanding_calls; |
21 | static atomic_t afs_outstanding_skbs; | |
08e0e7c8 DH |
22 | |
23 | static void afs_wake_up_call_waiter(struct afs_call *); | |
24 | static int afs_wait_for_call_to_complete(struct afs_call *); | |
25 | static void afs_wake_up_async_call(struct afs_call *); | |
26 | static int afs_dont_wait_for_call_to_complete(struct afs_call *); | |
27 | static void afs_process_async_call(struct work_struct *); | |
28 | static void afs_rx_interceptor(struct sock *, unsigned long, struct sk_buff *); | |
29 | static int afs_deliver_cm_op_id(struct afs_call *, struct sk_buff *, bool); | |
30 | ||
31 | /* synchronous call management */ | |
32 | const struct afs_wait_mode afs_sync_call = { | |
33 | .rx_wakeup = afs_wake_up_call_waiter, | |
34 | .wait = afs_wait_for_call_to_complete, | |
35 | }; | |
36 | ||
37 | /* asynchronous call management */ | |
38 | const struct afs_wait_mode afs_async_call = { | |
39 | .rx_wakeup = afs_wake_up_async_call, | |
40 | .wait = afs_dont_wait_for_call_to_complete, | |
41 | }; | |
42 | ||
43 | /* asynchronous incoming call management */ | |
44 | static const struct afs_wait_mode afs_async_incoming_call = { | |
45 | .rx_wakeup = afs_wake_up_async_call, | |
46 | }; | |
47 | ||
48 | /* asynchronous incoming call initial processing */ | |
49 | static const struct afs_call_type afs_RXCMxxxx = { | |
00d3b7a4 | 50 | .name = "CB.xxxx", |
08e0e7c8 DH |
51 | .deliver = afs_deliver_cm_op_id, |
52 | .abort_to_error = afs_abort_to_error, | |
53 | }; | |
54 | ||
55 | static void afs_collect_incoming_call(struct work_struct *); | |
56 | ||
57 | static struct sk_buff_head afs_incoming_calls; | |
58 | static DECLARE_WORK(afs_collect_incoming_call_work, afs_collect_incoming_call); | |
59 | ||
60 | /* | |
61 | * open an RxRPC socket and bind it to be a server for callback notifications | |
62 | * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT | |
63 | */ | |
64 | int afs_open_socket(void) | |
65 | { | |
66 | struct sockaddr_rxrpc srx; | |
67 | struct socket *socket; | |
68 | int ret; | |
69 | ||
70 | _enter(""); | |
71 | ||
72 | skb_queue_head_init(&afs_incoming_calls); | |
73 | ||
74 | afs_async_calls = create_singlethread_workqueue("kafsd"); | |
75 | if (!afs_async_calls) { | |
76 | _leave(" = -ENOMEM [wq]"); | |
77 | return -ENOMEM; | |
78 | } | |
79 | ||
80 | ret = sock_create_kern(AF_RXRPC, SOCK_DGRAM, PF_INET, &socket); | |
81 | if (ret < 0) { | |
82 | destroy_workqueue(afs_async_calls); | |
83 | _leave(" = %d [socket]", ret); | |
84 | return ret; | |
85 | } | |
86 | ||
87 | socket->sk->sk_allocation = GFP_NOFS; | |
88 | ||
89 | /* bind the callback manager's address to make this a server socket */ | |
90 | srx.srx_family = AF_RXRPC; | |
91 | srx.srx_service = CM_SERVICE; | |
92 | srx.transport_type = SOCK_DGRAM; | |
93 | srx.transport_len = sizeof(srx.transport.sin); | |
94 | srx.transport.sin.sin_family = AF_INET; | |
95 | srx.transport.sin.sin_port = htons(AFS_CM_PORT); | |
96 | memset(&srx.transport.sin.sin_addr, 0, | |
97 | sizeof(srx.transport.sin.sin_addr)); | |
98 | ||
99 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); | |
100 | if (ret < 0) { | |
101 | sock_release(socket); | |
102 | _leave(" = %d [bind]", ret); | |
103 | return ret; | |
104 | } | |
105 | ||
106 | rxrpc_kernel_intercept_rx_messages(socket, afs_rx_interceptor); | |
107 | ||
108 | afs_socket = socket; | |
109 | _leave(" = 0"); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | /* | |
114 | * close the RxRPC socket AFS was using | |
115 | */ | |
116 | void afs_close_socket(void) | |
117 | { | |
118 | _enter(""); | |
119 | ||
120 | sock_release(afs_socket); | |
121 | ||
122 | _debug("dework"); | |
123 | destroy_workqueue(afs_async_calls); | |
00d3b7a4 DH |
124 | |
125 | ASSERTCMP(atomic_read(&afs_outstanding_skbs), ==, 0); | |
126 | ASSERTCMP(atomic_read(&afs_outstanding_calls), ==, 0); | |
08e0e7c8 DH |
127 | _leave(""); |
128 | } | |
129 | ||
00d3b7a4 DH |
130 | /* |
131 | * note that the data in a socket buffer is now delivered and that the buffer | |
132 | * should be freed | |
133 | */ | |
134 | static void afs_data_delivered(struct sk_buff *skb) | |
135 | { | |
136 | if (!skb) { | |
137 | _debug("DLVR NULL [%d]", atomic_read(&afs_outstanding_skbs)); | |
138 | dump_stack(); | |
139 | } else { | |
140 | _debug("DLVR %p{%u} [%d]", | |
141 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
142 | if (atomic_dec_return(&afs_outstanding_skbs) == -1) | |
143 | BUG(); | |
144 | rxrpc_kernel_data_delivered(skb); | |
145 | } | |
146 | } | |
147 | ||
148 | /* | |
149 | * free a socket buffer | |
150 | */ | |
151 | static void afs_free_skb(struct sk_buff *skb) | |
152 | { | |
153 | if (!skb) { | |
154 | _debug("FREE NULL [%d]", atomic_read(&afs_outstanding_skbs)); | |
155 | dump_stack(); | |
156 | } else { | |
157 | _debug("FREE %p{%u} [%d]", | |
158 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
159 | if (atomic_dec_return(&afs_outstanding_skbs) == -1) | |
160 | BUG(); | |
161 | rxrpc_kernel_free_skb(skb); | |
162 | } | |
163 | } | |
164 | ||
165 | /* | |
166 | * free a call | |
167 | */ | |
168 | static void afs_free_call(struct afs_call *call) | |
169 | { | |
170 | _debug("DONE %p{%s} [%d]", | |
171 | call, call->type->name, atomic_read(&afs_outstanding_calls)); | |
172 | if (atomic_dec_return(&afs_outstanding_calls) == -1) | |
173 | BUG(); | |
174 | ||
175 | ASSERTCMP(call->rxcall, ==, NULL); | |
176 | ASSERT(!work_pending(&call->async_work)); | |
177 | ASSERT(skb_queue_empty(&call->rx_queue)); | |
178 | ASSERT(call->type->name != NULL); | |
179 | ||
180 | kfree(call->request); | |
181 | kfree(call); | |
182 | } | |
183 | ||
08e0e7c8 DH |
184 | /* |
185 | * allocate a call with flat request and reply buffers | |
186 | */ | |
187 | struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, | |
188 | size_t request_size, size_t reply_size) | |
189 | { | |
190 | struct afs_call *call; | |
191 | ||
192 | call = kzalloc(sizeof(*call), GFP_NOFS); | |
193 | if (!call) | |
194 | goto nomem_call; | |
195 | ||
00d3b7a4 DH |
196 | _debug("CALL %p{%s} [%d]", |
197 | call, type->name, atomic_read(&afs_outstanding_calls)); | |
198 | atomic_inc(&afs_outstanding_calls); | |
199 | ||
200 | call->type = type; | |
201 | call->request_size = request_size; | |
202 | call->reply_max = reply_size; | |
203 | ||
08e0e7c8 DH |
204 | if (request_size) { |
205 | call->request = kmalloc(request_size, GFP_NOFS); | |
206 | if (!call->request) | |
00d3b7a4 | 207 | goto nomem_free; |
08e0e7c8 DH |
208 | } |
209 | ||
210 | if (reply_size) { | |
211 | call->buffer = kmalloc(reply_size, GFP_NOFS); | |
212 | if (!call->buffer) | |
00d3b7a4 | 213 | goto nomem_free; |
08e0e7c8 DH |
214 | } |
215 | ||
08e0e7c8 DH |
216 | init_waitqueue_head(&call->waitq); |
217 | skb_queue_head_init(&call->rx_queue); | |
218 | return call; | |
219 | ||
00d3b7a4 DH |
220 | nomem_free: |
221 | afs_free_call(call); | |
08e0e7c8 DH |
222 | nomem_call: |
223 | return NULL; | |
224 | } | |
225 | ||
226 | /* | |
227 | * clean up a call with flat buffer | |
228 | */ | |
229 | void afs_flat_call_destructor(struct afs_call *call) | |
230 | { | |
231 | _enter(""); | |
232 | ||
233 | kfree(call->request); | |
234 | call->request = NULL; | |
235 | kfree(call->buffer); | |
236 | call->buffer = NULL; | |
237 | } | |
238 | ||
239 | /* | |
240 | * initiate a call | |
241 | */ | |
242 | int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, | |
243 | const struct afs_wait_mode *wait_mode) | |
244 | { | |
245 | struct sockaddr_rxrpc srx; | |
246 | struct rxrpc_call *rxcall; | |
247 | struct msghdr msg; | |
248 | struct kvec iov[1]; | |
249 | int ret; | |
250 | ||
251 | _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); | |
252 | ||
00d3b7a4 DH |
253 | ASSERT(call->type != NULL); |
254 | ASSERT(call->type->name != NULL); | |
255 | ||
256 | _debug("MAKE %p{%s} [%d]", | |
257 | call, call->type->name, atomic_read(&afs_outstanding_calls)); | |
258 | ||
08e0e7c8 DH |
259 | call->wait_mode = wait_mode; |
260 | INIT_WORK(&call->async_work, afs_process_async_call); | |
261 | ||
262 | memset(&srx, 0, sizeof(srx)); | |
263 | srx.srx_family = AF_RXRPC; | |
264 | srx.srx_service = call->service_id; | |
265 | srx.transport_type = SOCK_DGRAM; | |
266 | srx.transport_len = sizeof(srx.transport.sin); | |
267 | srx.transport.sin.sin_family = AF_INET; | |
268 | srx.transport.sin.sin_port = call->port; | |
269 | memcpy(&srx.transport.sin.sin_addr, addr, 4); | |
270 | ||
271 | /* create a call */ | |
272 | rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, | |
273 | (unsigned long) call, gfp); | |
00d3b7a4 | 274 | call->key = NULL; |
08e0e7c8 DH |
275 | if (IS_ERR(rxcall)) { |
276 | ret = PTR_ERR(rxcall); | |
277 | goto error_kill_call; | |
278 | } | |
279 | ||
280 | call->rxcall = rxcall; | |
281 | ||
282 | /* send the request */ | |
283 | iov[0].iov_base = call->request; | |
284 | iov[0].iov_len = call->request_size; | |
285 | ||
286 | msg.msg_name = NULL; | |
287 | msg.msg_namelen = 0; | |
288 | msg.msg_iov = (struct iovec *) iov; | |
289 | msg.msg_iovlen = 1; | |
290 | msg.msg_control = NULL; | |
291 | msg.msg_controllen = 0; | |
292 | msg.msg_flags = 0; | |
293 | ||
294 | /* have to change the state *before* sending the last packet as RxRPC | |
295 | * might give us the reply before it returns from sending the | |
296 | * request */ | |
297 | call->state = AFS_CALL_AWAIT_REPLY; | |
298 | ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size); | |
299 | if (ret < 0) | |
300 | goto error_do_abort; | |
301 | ||
302 | /* at this point, an async call may no longer exist as it may have | |
303 | * already completed */ | |
304 | return wait_mode->wait(call); | |
305 | ||
306 | error_do_abort: | |
307 | rxrpc_kernel_abort_call(rxcall, RX_USER_ABORT); | |
308 | rxrpc_kernel_end_call(rxcall); | |
00d3b7a4 | 309 | call->rxcall = NULL; |
08e0e7c8 DH |
310 | error_kill_call: |
311 | call->type->destructor(call); | |
00d3b7a4 | 312 | afs_free_call(call); |
08e0e7c8 DH |
313 | _leave(" = %d", ret); |
314 | return ret; | |
315 | } | |
316 | ||
317 | /* | |
318 | * handles intercepted messages that were arriving in the socket's Rx queue | |
319 | * - called with the socket receive queue lock held to ensure message ordering | |
320 | * - called with softirqs disabled | |
321 | */ | |
322 | static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID, | |
323 | struct sk_buff *skb) | |
324 | { | |
325 | struct afs_call *call = (struct afs_call *) user_call_ID; | |
326 | ||
327 | _enter("%p,,%u", call, skb->mark); | |
328 | ||
00d3b7a4 DH |
329 | _debug("ICPT %p{%u} [%d]", |
330 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
331 | ||
08e0e7c8 | 332 | ASSERTCMP(sk, ==, afs_socket->sk); |
00d3b7a4 | 333 | atomic_inc(&afs_outstanding_skbs); |
08e0e7c8 DH |
334 | |
335 | if (!call) { | |
336 | /* its an incoming call for our callback service */ | |
00d3b7a4 | 337 | skb_queue_tail(&afs_incoming_calls, skb); |
08e0e7c8 DH |
338 | schedule_work(&afs_collect_incoming_call_work); |
339 | } else { | |
340 | /* route the messages directly to the appropriate call */ | |
00d3b7a4 | 341 | skb_queue_tail(&call->rx_queue, skb); |
08e0e7c8 DH |
342 | call->wait_mode->rx_wakeup(call); |
343 | } | |
344 | ||
345 | _leave(""); | |
346 | } | |
347 | ||
348 | /* | |
349 | * deliver messages to a call | |
350 | */ | |
351 | static void afs_deliver_to_call(struct afs_call *call) | |
352 | { | |
353 | struct sk_buff *skb; | |
354 | bool last; | |
355 | u32 abort_code; | |
356 | int ret; | |
357 | ||
358 | _enter(""); | |
359 | ||
360 | while ((call->state == AFS_CALL_AWAIT_REPLY || | |
361 | call->state == AFS_CALL_AWAIT_OP_ID || | |
362 | call->state == AFS_CALL_AWAIT_REQUEST || | |
363 | call->state == AFS_CALL_AWAIT_ACK) && | |
364 | (skb = skb_dequeue(&call->rx_queue))) { | |
365 | switch (skb->mark) { | |
366 | case RXRPC_SKB_MARK_DATA: | |
367 | _debug("Rcv DATA"); | |
368 | last = rxrpc_kernel_is_data_last(skb); | |
369 | ret = call->type->deliver(call, skb, last); | |
370 | switch (ret) { | |
371 | case 0: | |
372 | if (last && | |
373 | call->state == AFS_CALL_AWAIT_REPLY) | |
374 | call->state = AFS_CALL_COMPLETE; | |
375 | break; | |
376 | case -ENOTCONN: | |
377 | abort_code = RX_CALL_DEAD; | |
378 | goto do_abort; | |
379 | case -ENOTSUPP: | |
380 | abort_code = RX_INVALID_OPERATION; | |
381 | goto do_abort; | |
382 | default: | |
383 | abort_code = RXGEN_CC_UNMARSHAL; | |
384 | if (call->state != AFS_CALL_AWAIT_REPLY) | |
385 | abort_code = RXGEN_SS_UNMARSHAL; | |
386 | do_abort: | |
387 | rxrpc_kernel_abort_call(call->rxcall, | |
388 | abort_code); | |
389 | call->error = ret; | |
390 | call->state = AFS_CALL_ERROR; | |
391 | break; | |
392 | } | |
00d3b7a4 | 393 | afs_data_delivered(skb); |
08e0e7c8 | 394 | skb = NULL; |
00d3b7a4 | 395 | continue; |
08e0e7c8 DH |
396 | case RXRPC_SKB_MARK_FINAL_ACK: |
397 | _debug("Rcv ACK"); | |
398 | call->state = AFS_CALL_COMPLETE; | |
399 | break; | |
400 | case RXRPC_SKB_MARK_BUSY: | |
401 | _debug("Rcv BUSY"); | |
402 | call->error = -EBUSY; | |
403 | call->state = AFS_CALL_BUSY; | |
404 | break; | |
405 | case RXRPC_SKB_MARK_REMOTE_ABORT: | |
406 | abort_code = rxrpc_kernel_get_abort_code(skb); | |
407 | call->error = call->type->abort_to_error(abort_code); | |
408 | call->state = AFS_CALL_ABORTED; | |
409 | _debug("Rcv ABORT %u -> %d", abort_code, call->error); | |
410 | break; | |
411 | case RXRPC_SKB_MARK_NET_ERROR: | |
412 | call->error = -rxrpc_kernel_get_error_number(skb); | |
413 | call->state = AFS_CALL_ERROR; | |
414 | _debug("Rcv NET ERROR %d", call->error); | |
415 | break; | |
416 | case RXRPC_SKB_MARK_LOCAL_ERROR: | |
417 | call->error = -rxrpc_kernel_get_error_number(skb); | |
418 | call->state = AFS_CALL_ERROR; | |
419 | _debug("Rcv LOCAL ERROR %d", call->error); | |
420 | break; | |
421 | default: | |
422 | BUG(); | |
423 | break; | |
424 | } | |
425 | ||
00d3b7a4 | 426 | afs_free_skb(skb); |
08e0e7c8 DH |
427 | } |
428 | ||
429 | /* make sure the queue is empty if the call is done with (we might have | |
430 | * aborted the call early because of an unmarshalling error) */ | |
431 | if (call->state >= AFS_CALL_COMPLETE) { | |
432 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 433 | afs_free_skb(skb); |
08e0e7c8 DH |
434 | if (call->incoming) { |
435 | rxrpc_kernel_end_call(call->rxcall); | |
00d3b7a4 | 436 | call->rxcall = NULL; |
08e0e7c8 | 437 | call->type->destructor(call); |
00d3b7a4 | 438 | afs_free_call(call); |
08e0e7c8 DH |
439 | } |
440 | } | |
441 | ||
442 | _leave(""); | |
443 | } | |
444 | ||
445 | /* | |
446 | * wait synchronously for a call to complete | |
447 | */ | |
448 | static int afs_wait_for_call_to_complete(struct afs_call *call) | |
449 | { | |
450 | struct sk_buff *skb; | |
451 | int ret; | |
452 | ||
453 | DECLARE_WAITQUEUE(myself, current); | |
454 | ||
455 | _enter(""); | |
456 | ||
457 | add_wait_queue(&call->waitq, &myself); | |
458 | for (;;) { | |
459 | set_current_state(TASK_INTERRUPTIBLE); | |
460 | ||
461 | /* deliver any messages that are in the queue */ | |
462 | if (!skb_queue_empty(&call->rx_queue)) { | |
463 | __set_current_state(TASK_RUNNING); | |
464 | afs_deliver_to_call(call); | |
465 | continue; | |
466 | } | |
467 | ||
468 | ret = call->error; | |
469 | if (call->state >= AFS_CALL_COMPLETE) | |
470 | break; | |
471 | ret = -EINTR; | |
472 | if (signal_pending(current)) | |
473 | break; | |
474 | schedule(); | |
475 | } | |
476 | ||
477 | remove_wait_queue(&call->waitq, &myself); | |
478 | __set_current_state(TASK_RUNNING); | |
479 | ||
480 | /* kill the call */ | |
481 | if (call->state < AFS_CALL_COMPLETE) { | |
482 | _debug("call incomplete"); | |
483 | rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD); | |
484 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 485 | afs_free_skb(skb); |
08e0e7c8 DH |
486 | } |
487 | ||
488 | _debug("call complete"); | |
489 | rxrpc_kernel_end_call(call->rxcall); | |
00d3b7a4 | 490 | call->rxcall = NULL; |
08e0e7c8 | 491 | call->type->destructor(call); |
00d3b7a4 | 492 | afs_free_call(call); |
08e0e7c8 DH |
493 | _leave(" = %d", ret); |
494 | return ret; | |
495 | } | |
496 | ||
497 | /* | |
498 | * wake up a waiting call | |
499 | */ | |
500 | static void afs_wake_up_call_waiter(struct afs_call *call) | |
501 | { | |
502 | wake_up(&call->waitq); | |
503 | } | |
504 | ||
505 | /* | |
506 | * wake up an asynchronous call | |
507 | */ | |
508 | static void afs_wake_up_async_call(struct afs_call *call) | |
509 | { | |
510 | _enter(""); | |
511 | queue_work(afs_async_calls, &call->async_work); | |
512 | } | |
513 | ||
514 | /* | |
515 | * put a call into asynchronous mode | |
516 | * - mustn't touch the call descriptor as the call my have completed by the | |
517 | * time we get here | |
518 | */ | |
519 | static int afs_dont_wait_for_call_to_complete(struct afs_call *call) | |
520 | { | |
521 | _enter(""); | |
522 | return -EINPROGRESS; | |
523 | } | |
524 | ||
525 | /* | |
526 | * delete an asynchronous call | |
527 | */ | |
528 | static void afs_delete_async_call(struct work_struct *work) | |
529 | { | |
530 | struct afs_call *call = | |
531 | container_of(work, struct afs_call, async_work); | |
532 | ||
533 | _enter(""); | |
534 | ||
00d3b7a4 | 535 | afs_free_call(call); |
08e0e7c8 DH |
536 | |
537 | _leave(""); | |
538 | } | |
539 | ||
540 | /* | |
541 | * perform processing on an asynchronous call | |
542 | * - on a multiple-thread workqueue this work item may try to run on several | |
543 | * CPUs at the same time | |
544 | */ | |
545 | static void afs_process_async_call(struct work_struct *work) | |
546 | { | |
547 | struct afs_call *call = | |
548 | container_of(work, struct afs_call, async_work); | |
549 | ||
550 | _enter(""); | |
551 | ||
552 | if (!skb_queue_empty(&call->rx_queue)) | |
553 | afs_deliver_to_call(call); | |
554 | ||
555 | if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) { | |
556 | if (call->wait_mode->async_complete) | |
557 | call->wait_mode->async_complete(call->reply, | |
558 | call->error); | |
559 | call->reply = NULL; | |
560 | ||
561 | /* kill the call */ | |
562 | rxrpc_kernel_end_call(call->rxcall); | |
00d3b7a4 | 563 | call->rxcall = NULL; |
08e0e7c8 DH |
564 | if (call->type->destructor) |
565 | call->type->destructor(call); | |
566 | ||
567 | /* we can't just delete the call because the work item may be | |
568 | * queued */ | |
569 | PREPARE_WORK(&call->async_work, afs_delete_async_call); | |
570 | queue_work(afs_async_calls, &call->async_work); | |
571 | } | |
572 | ||
573 | _leave(""); | |
574 | } | |
575 | ||
576 | /* | |
577 | * empty a socket buffer into a flat reply buffer | |
578 | */ | |
579 | void afs_transfer_reply(struct afs_call *call, struct sk_buff *skb) | |
580 | { | |
581 | size_t len = skb->len; | |
582 | ||
583 | if (skb_copy_bits(skb, 0, call->buffer + call->reply_size, len) < 0) | |
584 | BUG(); | |
585 | call->reply_size += len; | |
586 | } | |
587 | ||
588 | /* | |
589 | * accept the backlog of incoming calls | |
590 | */ | |
591 | static void afs_collect_incoming_call(struct work_struct *work) | |
592 | { | |
593 | struct rxrpc_call *rxcall; | |
594 | struct afs_call *call = NULL; | |
595 | struct sk_buff *skb; | |
596 | ||
597 | while ((skb = skb_dequeue(&afs_incoming_calls))) { | |
598 | _debug("new call"); | |
599 | ||
600 | /* don't need the notification */ | |
00d3b7a4 | 601 | afs_free_skb(skb); |
08e0e7c8 DH |
602 | |
603 | if (!call) { | |
604 | call = kzalloc(sizeof(struct afs_call), GFP_KERNEL); | |
605 | if (!call) { | |
606 | rxrpc_kernel_reject_call(afs_socket); | |
607 | return; | |
608 | } | |
609 | ||
610 | INIT_WORK(&call->async_work, afs_process_async_call); | |
611 | call->wait_mode = &afs_async_incoming_call; | |
612 | call->type = &afs_RXCMxxxx; | |
613 | init_waitqueue_head(&call->waitq); | |
614 | skb_queue_head_init(&call->rx_queue); | |
615 | call->state = AFS_CALL_AWAIT_OP_ID; | |
00d3b7a4 DH |
616 | |
617 | _debug("CALL %p{%s} [%d]", | |
618 | call, call->type->name, | |
619 | atomic_read(&afs_outstanding_calls)); | |
620 | atomic_inc(&afs_outstanding_calls); | |
08e0e7c8 DH |
621 | } |
622 | ||
623 | rxcall = rxrpc_kernel_accept_call(afs_socket, | |
624 | (unsigned long) call); | |
625 | if (!IS_ERR(rxcall)) { | |
626 | call->rxcall = rxcall; | |
627 | call = NULL; | |
628 | } | |
629 | } | |
630 | ||
00d3b7a4 DH |
631 | if (call) |
632 | afs_free_call(call); | |
08e0e7c8 DH |
633 | } |
634 | ||
635 | /* | |
636 | * grab the operation ID from an incoming cache manager call | |
637 | */ | |
638 | static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb, | |
639 | bool last) | |
640 | { | |
641 | size_t len = skb->len; | |
642 | void *oibuf = (void *) &call->operation_ID; | |
643 | ||
644 | _enter("{%u},{%zu},%d", call->offset, len, last); | |
645 | ||
646 | ASSERTCMP(call->offset, <, 4); | |
647 | ||
648 | /* the operation ID forms the first four bytes of the request data */ | |
649 | len = min_t(size_t, len, 4 - call->offset); | |
650 | if (skb_copy_bits(skb, 0, oibuf + call->offset, len) < 0) | |
651 | BUG(); | |
652 | if (!pskb_pull(skb, len)) | |
653 | BUG(); | |
654 | call->offset += len; | |
655 | ||
656 | if (call->offset < 4) { | |
657 | if (last) { | |
658 | _leave(" = -EBADMSG [op ID short]"); | |
659 | return -EBADMSG; | |
660 | } | |
661 | _leave(" = 0 [incomplete]"); | |
662 | return 0; | |
663 | } | |
664 | ||
665 | call->state = AFS_CALL_AWAIT_REQUEST; | |
666 | ||
667 | /* ask the cache manager to route the call (it'll change the call type | |
668 | * if successful) */ | |
669 | if (!afs_cm_incoming_call(call)) | |
670 | return -ENOTSUPP; | |
671 | ||
672 | /* pass responsibility for the remainer of this message off to the | |
673 | * cache manager op */ | |
674 | return call->type->deliver(call, skb, last); | |
675 | } | |
676 | ||
677 | /* | |
678 | * send an empty reply | |
679 | */ | |
680 | void afs_send_empty_reply(struct afs_call *call) | |
681 | { | |
682 | struct msghdr msg; | |
683 | struct iovec iov[1]; | |
684 | ||
685 | _enter(""); | |
686 | ||
687 | iov[0].iov_base = NULL; | |
688 | iov[0].iov_len = 0; | |
689 | msg.msg_name = NULL; | |
690 | msg.msg_namelen = 0; | |
691 | msg.msg_iov = iov; | |
692 | msg.msg_iovlen = 0; | |
693 | msg.msg_control = NULL; | |
694 | msg.msg_controllen = 0; | |
695 | msg.msg_flags = 0; | |
696 | ||
697 | call->state = AFS_CALL_AWAIT_ACK; | |
698 | switch (rxrpc_kernel_send_data(call->rxcall, &msg, 0)) { | |
699 | case 0: | |
700 | _leave(" [replied]"); | |
701 | return; | |
702 | ||
703 | case -ENOMEM: | |
704 | _debug("oom"); | |
705 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); | |
706 | default: | |
707 | rxrpc_kernel_end_call(call->rxcall); | |
708 | call->rxcall = NULL; | |
709 | call->type->destructor(call); | |
00d3b7a4 | 710 | afs_free_call(call); |
08e0e7c8 DH |
711 | _leave(" [error]"); |
712 | return; | |
713 | } | |
714 | } | |
715 | ||
716 | /* | |
717 | * extract a piece of data from the received data socket buffers | |
718 | */ | |
719 | int afs_extract_data(struct afs_call *call, struct sk_buff *skb, | |
720 | bool last, void *buf, size_t count) | |
721 | { | |
722 | size_t len = skb->len; | |
723 | ||
724 | _enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count); | |
725 | ||
726 | ASSERTCMP(call->offset, <, count); | |
727 | ||
728 | len = min_t(size_t, len, count - call->offset); | |
729 | if (skb_copy_bits(skb, 0, buf + call->offset, len) < 0 || | |
730 | !pskb_pull(skb, len)) | |
731 | BUG(); | |
732 | call->offset += len; | |
733 | ||
734 | if (call->offset < count) { | |
735 | if (last) { | |
736 | _leave(" = -EBADMSG [%d < %lu]", call->offset, count); | |
737 | return -EBADMSG; | |
738 | } | |
739 | _leave(" = -EAGAIN"); | |
740 | return -EAGAIN; | |
741 | } | |
742 | return 0; | |
743 | } |