Commit | Line | Data |
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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 | ||
5a0e3ad6 | 12 | #include <linux/slab.h> |
08e0e7c8 DH |
13 | #include <net/sock.h> |
14 | #include <net/af_rxrpc.h> | |
15 | #include <rxrpc/packet.h> | |
16 | #include "internal.h" | |
17 | #include "afs_cm.h" | |
18 | ||
19 | static struct socket *afs_socket; /* my RxRPC socket */ | |
20 | static struct workqueue_struct *afs_async_calls; | |
00d3b7a4 DH |
21 | static atomic_t afs_outstanding_calls; |
22 | static atomic_t afs_outstanding_skbs; | |
08e0e7c8 DH |
23 | |
24 | static void afs_wake_up_call_waiter(struct afs_call *); | |
25 | static int afs_wait_for_call_to_complete(struct afs_call *); | |
26 | static void afs_wake_up_async_call(struct afs_call *); | |
27 | static int afs_dont_wait_for_call_to_complete(struct afs_call *); | |
28 | static void afs_process_async_call(struct work_struct *); | |
29 | static void afs_rx_interceptor(struct sock *, unsigned long, struct sk_buff *); | |
30 | static int afs_deliver_cm_op_id(struct afs_call *, struct sk_buff *, bool); | |
31 | ||
32 | /* synchronous call management */ | |
33 | const struct afs_wait_mode afs_sync_call = { | |
34 | .rx_wakeup = afs_wake_up_call_waiter, | |
35 | .wait = afs_wait_for_call_to_complete, | |
36 | }; | |
37 | ||
38 | /* asynchronous call management */ | |
39 | const struct afs_wait_mode afs_async_call = { | |
40 | .rx_wakeup = afs_wake_up_async_call, | |
41 | .wait = afs_dont_wait_for_call_to_complete, | |
42 | }; | |
43 | ||
44 | /* asynchronous incoming call management */ | |
45 | static const struct afs_wait_mode afs_async_incoming_call = { | |
46 | .rx_wakeup = afs_wake_up_async_call, | |
47 | }; | |
48 | ||
49 | /* asynchronous incoming call initial processing */ | |
50 | static const struct afs_call_type afs_RXCMxxxx = { | |
00d3b7a4 | 51 | .name = "CB.xxxx", |
08e0e7c8 DH |
52 | .deliver = afs_deliver_cm_op_id, |
53 | .abort_to_error = afs_abort_to_error, | |
54 | }; | |
55 | ||
56 | static void afs_collect_incoming_call(struct work_struct *); | |
57 | ||
58 | static struct sk_buff_head afs_incoming_calls; | |
59 | static DECLARE_WORK(afs_collect_incoming_call_work, afs_collect_incoming_call); | |
60 | ||
61 | /* | |
62 | * open an RxRPC socket and bind it to be a server for callback notifications | |
63 | * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT | |
64 | */ | |
65 | int afs_open_socket(void) | |
66 | { | |
67 | struct sockaddr_rxrpc srx; | |
68 | struct socket *socket; | |
69 | int ret; | |
70 | ||
71 | _enter(""); | |
72 | ||
73 | skb_queue_head_init(&afs_incoming_calls); | |
74 | ||
75 | afs_async_calls = create_singlethread_workqueue("kafsd"); | |
76 | if (!afs_async_calls) { | |
77 | _leave(" = -ENOMEM [wq]"); | |
78 | return -ENOMEM; | |
79 | } | |
80 | ||
81 | ret = sock_create_kern(AF_RXRPC, SOCK_DGRAM, PF_INET, &socket); | |
82 | if (ret < 0) { | |
83 | destroy_workqueue(afs_async_calls); | |
84 | _leave(" = %d [socket]", ret); | |
85 | return ret; | |
86 | } | |
87 | ||
88 | socket->sk->sk_allocation = GFP_NOFS; | |
89 | ||
90 | /* bind the callback manager's address to make this a server socket */ | |
91 | srx.srx_family = AF_RXRPC; | |
92 | srx.srx_service = CM_SERVICE; | |
93 | srx.transport_type = SOCK_DGRAM; | |
94 | srx.transport_len = sizeof(srx.transport.sin); | |
95 | srx.transport.sin.sin_family = AF_INET; | |
96 | srx.transport.sin.sin_port = htons(AFS_CM_PORT); | |
97 | memset(&srx.transport.sin.sin_addr, 0, | |
98 | sizeof(srx.transport.sin.sin_addr)); | |
99 | ||
100 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); | |
101 | if (ret < 0) { | |
102 | sock_release(socket); | |
bebf8cfa | 103 | destroy_workqueue(afs_async_calls); |
08e0e7c8 DH |
104 | _leave(" = %d [bind]", ret); |
105 | return ret; | |
106 | } | |
107 | ||
108 | rxrpc_kernel_intercept_rx_messages(socket, afs_rx_interceptor); | |
109 | ||
110 | afs_socket = socket; | |
111 | _leave(" = 0"); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | /* | |
116 | * close the RxRPC socket AFS was using | |
117 | */ | |
118 | void afs_close_socket(void) | |
119 | { | |
120 | _enter(""); | |
121 | ||
122 | sock_release(afs_socket); | |
123 | ||
124 | _debug("dework"); | |
125 | destroy_workqueue(afs_async_calls); | |
00d3b7a4 DH |
126 | |
127 | ASSERTCMP(atomic_read(&afs_outstanding_skbs), ==, 0); | |
128 | ASSERTCMP(atomic_read(&afs_outstanding_calls), ==, 0); | |
08e0e7c8 DH |
129 | _leave(""); |
130 | } | |
131 | ||
00d3b7a4 DH |
132 | /* |
133 | * note that the data in a socket buffer is now delivered and that the buffer | |
134 | * should be freed | |
135 | */ | |
136 | static void afs_data_delivered(struct sk_buff *skb) | |
137 | { | |
138 | if (!skb) { | |
139 | _debug("DLVR NULL [%d]", atomic_read(&afs_outstanding_skbs)); | |
140 | dump_stack(); | |
141 | } else { | |
142 | _debug("DLVR %p{%u} [%d]", | |
143 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
144 | if (atomic_dec_return(&afs_outstanding_skbs) == -1) | |
145 | BUG(); | |
146 | rxrpc_kernel_data_delivered(skb); | |
147 | } | |
148 | } | |
149 | ||
150 | /* | |
151 | * free a socket buffer | |
152 | */ | |
153 | static void afs_free_skb(struct sk_buff *skb) | |
154 | { | |
155 | if (!skb) { | |
156 | _debug("FREE NULL [%d]", atomic_read(&afs_outstanding_skbs)); | |
157 | dump_stack(); | |
158 | } else { | |
159 | _debug("FREE %p{%u} [%d]", | |
160 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
161 | if (atomic_dec_return(&afs_outstanding_skbs) == -1) | |
162 | BUG(); | |
163 | rxrpc_kernel_free_skb(skb); | |
164 | } | |
165 | } | |
166 | ||
167 | /* | |
168 | * free a call | |
169 | */ | |
170 | static void afs_free_call(struct afs_call *call) | |
171 | { | |
172 | _debug("DONE %p{%s} [%d]", | |
173 | call, call->type->name, atomic_read(&afs_outstanding_calls)); | |
174 | if (atomic_dec_return(&afs_outstanding_calls) == -1) | |
175 | BUG(); | |
176 | ||
177 | ASSERTCMP(call->rxcall, ==, NULL); | |
178 | ASSERT(!work_pending(&call->async_work)); | |
179 | ASSERT(skb_queue_empty(&call->rx_queue)); | |
180 | ASSERT(call->type->name != NULL); | |
181 | ||
182 | kfree(call->request); | |
183 | kfree(call); | |
184 | } | |
185 | ||
6c67c7c3 DH |
186 | /* |
187 | * End a call | |
188 | */ | |
189 | static void afs_end_call(struct afs_call *call) | |
190 | { | |
191 | if (call->rxcall) { | |
192 | rxrpc_kernel_end_call(call->rxcall); | |
193 | call->rxcall = NULL; | |
194 | } | |
195 | call->type->destructor(call); | |
196 | afs_free_call(call); | |
197 | } | |
198 | ||
08e0e7c8 DH |
199 | /* |
200 | * allocate a call with flat request and reply buffers | |
201 | */ | |
202 | struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, | |
203 | size_t request_size, size_t reply_size) | |
204 | { | |
205 | struct afs_call *call; | |
206 | ||
207 | call = kzalloc(sizeof(*call), GFP_NOFS); | |
208 | if (!call) | |
209 | goto nomem_call; | |
210 | ||
00d3b7a4 DH |
211 | _debug("CALL %p{%s} [%d]", |
212 | call, type->name, atomic_read(&afs_outstanding_calls)); | |
213 | atomic_inc(&afs_outstanding_calls); | |
214 | ||
215 | call->type = type; | |
216 | call->request_size = request_size; | |
217 | call->reply_max = reply_size; | |
218 | ||
08e0e7c8 DH |
219 | if (request_size) { |
220 | call->request = kmalloc(request_size, GFP_NOFS); | |
221 | if (!call->request) | |
00d3b7a4 | 222 | goto nomem_free; |
08e0e7c8 DH |
223 | } |
224 | ||
225 | if (reply_size) { | |
226 | call->buffer = kmalloc(reply_size, GFP_NOFS); | |
227 | if (!call->buffer) | |
00d3b7a4 | 228 | goto nomem_free; |
08e0e7c8 DH |
229 | } |
230 | ||
08e0e7c8 DH |
231 | init_waitqueue_head(&call->waitq); |
232 | skb_queue_head_init(&call->rx_queue); | |
233 | return call; | |
234 | ||
00d3b7a4 DH |
235 | nomem_free: |
236 | afs_free_call(call); | |
08e0e7c8 DH |
237 | nomem_call: |
238 | return NULL; | |
239 | } | |
240 | ||
241 | /* | |
242 | * clean up a call with flat buffer | |
243 | */ | |
244 | void afs_flat_call_destructor(struct afs_call *call) | |
245 | { | |
246 | _enter(""); | |
247 | ||
248 | kfree(call->request); | |
249 | call->request = NULL; | |
250 | kfree(call->buffer); | |
251 | call->buffer = NULL; | |
252 | } | |
253 | ||
31143d5d DH |
254 | /* |
255 | * attach the data from a bunch of pages on an inode to a call | |
256 | */ | |
c1206a2c AB |
257 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg, |
258 | struct kvec *iov) | |
31143d5d DH |
259 | { |
260 | struct page *pages[8]; | |
261 | unsigned count, n, loop, offset, to; | |
262 | pgoff_t first = call->first, last = call->last; | |
263 | int ret; | |
264 | ||
265 | _enter(""); | |
266 | ||
267 | offset = call->first_offset; | |
268 | call->first_offset = 0; | |
269 | ||
270 | do { | |
271 | _debug("attach %lx-%lx", first, last); | |
272 | ||
273 | count = last - first + 1; | |
274 | if (count > ARRAY_SIZE(pages)) | |
275 | count = ARRAY_SIZE(pages); | |
276 | n = find_get_pages_contig(call->mapping, first, count, pages); | |
277 | ASSERTCMP(n, ==, count); | |
278 | ||
279 | loop = 0; | |
280 | do { | |
281 | msg->msg_flags = 0; | |
282 | to = PAGE_SIZE; | |
283 | if (first + loop >= last) | |
284 | to = call->last_to; | |
285 | else | |
286 | msg->msg_flags = MSG_MORE; | |
287 | iov->iov_base = kmap(pages[loop]) + offset; | |
288 | iov->iov_len = to - offset; | |
289 | offset = 0; | |
290 | ||
291 | _debug("- range %u-%u%s", | |
292 | offset, to, msg->msg_flags ? " [more]" : ""); | |
293 | msg->msg_iov = (struct iovec *) iov; | |
294 | msg->msg_iovlen = 1; | |
295 | ||
296 | /* have to change the state *before* sending the last | |
297 | * packet as RxRPC might give us the reply before it | |
298 | * returns from sending the request */ | |
299 | if (first + loop >= last) | |
300 | call->state = AFS_CALL_AWAIT_REPLY; | |
301 | ret = rxrpc_kernel_send_data(call->rxcall, msg, | |
302 | to - offset); | |
303 | kunmap(pages[loop]); | |
304 | if (ret < 0) | |
305 | break; | |
306 | } while (++loop < count); | |
307 | first += count; | |
308 | ||
309 | for (loop = 0; loop < count; loop++) | |
310 | put_page(pages[loop]); | |
311 | if (ret < 0) | |
312 | break; | |
5bbf5d39 | 313 | } while (first <= last); |
31143d5d DH |
314 | |
315 | _leave(" = %d", ret); | |
316 | return ret; | |
317 | } | |
318 | ||
08e0e7c8 DH |
319 | /* |
320 | * initiate a call | |
321 | */ | |
322 | int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, | |
323 | const struct afs_wait_mode *wait_mode) | |
324 | { | |
325 | struct sockaddr_rxrpc srx; | |
326 | struct rxrpc_call *rxcall; | |
327 | struct msghdr msg; | |
328 | struct kvec iov[1]; | |
329 | int ret; | |
c0173863 | 330 | struct sk_buff *skb; |
08e0e7c8 DH |
331 | |
332 | _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); | |
333 | ||
00d3b7a4 DH |
334 | ASSERT(call->type != NULL); |
335 | ASSERT(call->type->name != NULL); | |
336 | ||
31143d5d DH |
337 | _debug("____MAKE %p{%s,%x} [%d]____", |
338 | call, call->type->name, key_serial(call->key), | |
339 | atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 | 340 | |
08e0e7c8 DH |
341 | call->wait_mode = wait_mode; |
342 | INIT_WORK(&call->async_work, afs_process_async_call); | |
343 | ||
344 | memset(&srx, 0, sizeof(srx)); | |
345 | srx.srx_family = AF_RXRPC; | |
346 | srx.srx_service = call->service_id; | |
347 | srx.transport_type = SOCK_DGRAM; | |
348 | srx.transport_len = sizeof(srx.transport.sin); | |
349 | srx.transport.sin.sin_family = AF_INET; | |
350 | srx.transport.sin.sin_port = call->port; | |
351 | memcpy(&srx.transport.sin.sin_addr, addr, 4); | |
352 | ||
353 | /* create a call */ | |
354 | rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, | |
355 | (unsigned long) call, gfp); | |
00d3b7a4 | 356 | call->key = NULL; |
08e0e7c8 DH |
357 | if (IS_ERR(rxcall)) { |
358 | ret = PTR_ERR(rxcall); | |
359 | goto error_kill_call; | |
360 | } | |
361 | ||
362 | call->rxcall = rxcall; | |
363 | ||
364 | /* send the request */ | |
365 | iov[0].iov_base = call->request; | |
366 | iov[0].iov_len = call->request_size; | |
367 | ||
368 | msg.msg_name = NULL; | |
369 | msg.msg_namelen = 0; | |
370 | msg.msg_iov = (struct iovec *) iov; | |
371 | msg.msg_iovlen = 1; | |
372 | msg.msg_control = NULL; | |
373 | msg.msg_controllen = 0; | |
31143d5d | 374 | msg.msg_flags = (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 DH |
375 | |
376 | /* have to change the state *before* sending the last packet as RxRPC | |
377 | * might give us the reply before it returns from sending the | |
378 | * request */ | |
31143d5d DH |
379 | if (!call->send_pages) |
380 | call->state = AFS_CALL_AWAIT_REPLY; | |
08e0e7c8 DH |
381 | ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size); |
382 | if (ret < 0) | |
383 | goto error_do_abort; | |
384 | ||
31143d5d DH |
385 | if (call->send_pages) { |
386 | ret = afs_send_pages(call, &msg, iov); | |
387 | if (ret < 0) | |
388 | goto error_do_abort; | |
389 | } | |
390 | ||
08e0e7c8 DH |
391 | /* at this point, an async call may no longer exist as it may have |
392 | * already completed */ | |
393 | return wait_mode->wait(call); | |
394 | ||
395 | error_do_abort: | |
396 | rxrpc_kernel_abort_call(rxcall, RX_USER_ABORT); | |
c0173863 AB |
397 | while ((skb = skb_dequeue(&call->rx_queue))) |
398 | afs_free_skb(skb); | |
08e0e7c8 | 399 | error_kill_call: |
6c67c7c3 | 400 | afs_end_call(call); |
08e0e7c8 DH |
401 | _leave(" = %d", ret); |
402 | return ret; | |
403 | } | |
404 | ||
405 | /* | |
406 | * handles intercepted messages that were arriving in the socket's Rx queue | |
407 | * - called with the socket receive queue lock held to ensure message ordering | |
408 | * - called with softirqs disabled | |
409 | */ | |
410 | static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID, | |
411 | struct sk_buff *skb) | |
412 | { | |
413 | struct afs_call *call = (struct afs_call *) user_call_ID; | |
414 | ||
415 | _enter("%p,,%u", call, skb->mark); | |
416 | ||
00d3b7a4 DH |
417 | _debug("ICPT %p{%u} [%d]", |
418 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
419 | ||
08e0e7c8 | 420 | ASSERTCMP(sk, ==, afs_socket->sk); |
00d3b7a4 | 421 | atomic_inc(&afs_outstanding_skbs); |
08e0e7c8 DH |
422 | |
423 | if (!call) { | |
424 | /* its an incoming call for our callback service */ | |
00d3b7a4 | 425 | skb_queue_tail(&afs_incoming_calls, skb); |
0ad53eee | 426 | queue_work(afs_wq, &afs_collect_incoming_call_work); |
08e0e7c8 DH |
427 | } else { |
428 | /* route the messages directly to the appropriate call */ | |
00d3b7a4 | 429 | skb_queue_tail(&call->rx_queue, skb); |
08e0e7c8 DH |
430 | call->wait_mode->rx_wakeup(call); |
431 | } | |
432 | ||
433 | _leave(""); | |
434 | } | |
435 | ||
436 | /* | |
437 | * deliver messages to a call | |
438 | */ | |
439 | static void afs_deliver_to_call(struct afs_call *call) | |
440 | { | |
441 | struct sk_buff *skb; | |
442 | bool last; | |
443 | u32 abort_code; | |
444 | int ret; | |
445 | ||
446 | _enter(""); | |
447 | ||
448 | while ((call->state == AFS_CALL_AWAIT_REPLY || | |
449 | call->state == AFS_CALL_AWAIT_OP_ID || | |
450 | call->state == AFS_CALL_AWAIT_REQUEST || | |
451 | call->state == AFS_CALL_AWAIT_ACK) && | |
452 | (skb = skb_dequeue(&call->rx_queue))) { | |
453 | switch (skb->mark) { | |
454 | case RXRPC_SKB_MARK_DATA: | |
455 | _debug("Rcv DATA"); | |
456 | last = rxrpc_kernel_is_data_last(skb); | |
457 | ret = call->type->deliver(call, skb, last); | |
458 | switch (ret) { | |
459 | case 0: | |
460 | if (last && | |
461 | call->state == AFS_CALL_AWAIT_REPLY) | |
462 | call->state = AFS_CALL_COMPLETE; | |
463 | break; | |
464 | case -ENOTCONN: | |
465 | abort_code = RX_CALL_DEAD; | |
466 | goto do_abort; | |
467 | case -ENOTSUPP: | |
468 | abort_code = RX_INVALID_OPERATION; | |
469 | goto do_abort; | |
470 | default: | |
471 | abort_code = RXGEN_CC_UNMARSHAL; | |
472 | if (call->state != AFS_CALL_AWAIT_REPLY) | |
473 | abort_code = RXGEN_SS_UNMARSHAL; | |
474 | do_abort: | |
475 | rxrpc_kernel_abort_call(call->rxcall, | |
476 | abort_code); | |
477 | call->error = ret; | |
478 | call->state = AFS_CALL_ERROR; | |
479 | break; | |
480 | } | |
00d3b7a4 | 481 | afs_data_delivered(skb); |
08e0e7c8 | 482 | skb = NULL; |
00d3b7a4 | 483 | continue; |
08e0e7c8 DH |
484 | case RXRPC_SKB_MARK_FINAL_ACK: |
485 | _debug("Rcv ACK"); | |
486 | call->state = AFS_CALL_COMPLETE; | |
487 | break; | |
488 | case RXRPC_SKB_MARK_BUSY: | |
489 | _debug("Rcv BUSY"); | |
490 | call->error = -EBUSY; | |
491 | call->state = AFS_CALL_BUSY; | |
492 | break; | |
493 | case RXRPC_SKB_MARK_REMOTE_ABORT: | |
494 | abort_code = rxrpc_kernel_get_abort_code(skb); | |
495 | call->error = call->type->abort_to_error(abort_code); | |
496 | call->state = AFS_CALL_ABORTED; | |
497 | _debug("Rcv ABORT %u -> %d", abort_code, call->error); | |
498 | break; | |
499 | case RXRPC_SKB_MARK_NET_ERROR: | |
500 | call->error = -rxrpc_kernel_get_error_number(skb); | |
501 | call->state = AFS_CALL_ERROR; | |
502 | _debug("Rcv NET ERROR %d", call->error); | |
503 | break; | |
504 | case RXRPC_SKB_MARK_LOCAL_ERROR: | |
505 | call->error = -rxrpc_kernel_get_error_number(skb); | |
506 | call->state = AFS_CALL_ERROR; | |
507 | _debug("Rcv LOCAL ERROR %d", call->error); | |
508 | break; | |
509 | default: | |
510 | BUG(); | |
511 | break; | |
512 | } | |
513 | ||
00d3b7a4 | 514 | afs_free_skb(skb); |
08e0e7c8 DH |
515 | } |
516 | ||
517 | /* make sure the queue is empty if the call is done with (we might have | |
518 | * aborted the call early because of an unmarshalling error) */ | |
519 | if (call->state >= AFS_CALL_COMPLETE) { | |
520 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 521 | afs_free_skb(skb); |
6c67c7c3 DH |
522 | if (call->incoming) |
523 | afs_end_call(call); | |
08e0e7c8 DH |
524 | } |
525 | ||
526 | _leave(""); | |
527 | } | |
528 | ||
529 | /* | |
530 | * wait synchronously for a call to complete | |
531 | */ | |
532 | static int afs_wait_for_call_to_complete(struct afs_call *call) | |
533 | { | |
534 | struct sk_buff *skb; | |
535 | int ret; | |
536 | ||
537 | DECLARE_WAITQUEUE(myself, current); | |
538 | ||
539 | _enter(""); | |
540 | ||
541 | add_wait_queue(&call->waitq, &myself); | |
542 | for (;;) { | |
543 | set_current_state(TASK_INTERRUPTIBLE); | |
544 | ||
545 | /* deliver any messages that are in the queue */ | |
546 | if (!skb_queue_empty(&call->rx_queue)) { | |
547 | __set_current_state(TASK_RUNNING); | |
548 | afs_deliver_to_call(call); | |
549 | continue; | |
550 | } | |
551 | ||
552 | ret = call->error; | |
553 | if (call->state >= AFS_CALL_COMPLETE) | |
554 | break; | |
555 | ret = -EINTR; | |
556 | if (signal_pending(current)) | |
557 | break; | |
558 | schedule(); | |
559 | } | |
560 | ||
561 | remove_wait_queue(&call->waitq, &myself); | |
562 | __set_current_state(TASK_RUNNING); | |
563 | ||
564 | /* kill the call */ | |
565 | if (call->state < AFS_CALL_COMPLETE) { | |
566 | _debug("call incomplete"); | |
567 | rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD); | |
568 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 569 | afs_free_skb(skb); |
08e0e7c8 DH |
570 | } |
571 | ||
572 | _debug("call complete"); | |
6c67c7c3 | 573 | afs_end_call(call); |
08e0e7c8 DH |
574 | _leave(" = %d", ret); |
575 | return ret; | |
576 | } | |
577 | ||
578 | /* | |
579 | * wake up a waiting call | |
580 | */ | |
581 | static void afs_wake_up_call_waiter(struct afs_call *call) | |
582 | { | |
583 | wake_up(&call->waitq); | |
584 | } | |
585 | ||
586 | /* | |
587 | * wake up an asynchronous call | |
588 | */ | |
589 | static void afs_wake_up_async_call(struct afs_call *call) | |
590 | { | |
591 | _enter(""); | |
592 | queue_work(afs_async_calls, &call->async_work); | |
593 | } | |
594 | ||
595 | /* | |
596 | * put a call into asynchronous mode | |
597 | * - mustn't touch the call descriptor as the call my have completed by the | |
598 | * time we get here | |
599 | */ | |
600 | static int afs_dont_wait_for_call_to_complete(struct afs_call *call) | |
601 | { | |
602 | _enter(""); | |
603 | return -EINPROGRESS; | |
604 | } | |
605 | ||
606 | /* | |
607 | * delete an asynchronous call | |
608 | */ | |
609 | static void afs_delete_async_call(struct work_struct *work) | |
610 | { | |
611 | struct afs_call *call = | |
612 | container_of(work, struct afs_call, async_work); | |
613 | ||
614 | _enter(""); | |
615 | ||
00d3b7a4 | 616 | afs_free_call(call); |
08e0e7c8 DH |
617 | |
618 | _leave(""); | |
619 | } | |
620 | ||
621 | /* | |
622 | * perform processing on an asynchronous call | |
623 | * - on a multiple-thread workqueue this work item may try to run on several | |
624 | * CPUs at the same time | |
625 | */ | |
626 | static void afs_process_async_call(struct work_struct *work) | |
627 | { | |
628 | struct afs_call *call = | |
629 | container_of(work, struct afs_call, async_work); | |
630 | ||
631 | _enter(""); | |
632 | ||
633 | if (!skb_queue_empty(&call->rx_queue)) | |
634 | afs_deliver_to_call(call); | |
635 | ||
636 | if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) { | |
637 | if (call->wait_mode->async_complete) | |
638 | call->wait_mode->async_complete(call->reply, | |
639 | call->error); | |
640 | call->reply = NULL; | |
641 | ||
642 | /* kill the call */ | |
643 | rxrpc_kernel_end_call(call->rxcall); | |
00d3b7a4 | 644 | call->rxcall = NULL; |
08e0e7c8 DH |
645 | if (call->type->destructor) |
646 | call->type->destructor(call); | |
647 | ||
648 | /* we can't just delete the call because the work item may be | |
649 | * queued */ | |
05949945 | 650 | call->async_workfn = afs_delete_async_call; |
08e0e7c8 DH |
651 | queue_work(afs_async_calls, &call->async_work); |
652 | } | |
653 | ||
654 | _leave(""); | |
655 | } | |
656 | ||
657 | /* | |
658 | * empty a socket buffer into a flat reply buffer | |
659 | */ | |
660 | void afs_transfer_reply(struct afs_call *call, struct sk_buff *skb) | |
661 | { | |
662 | size_t len = skb->len; | |
663 | ||
664 | if (skb_copy_bits(skb, 0, call->buffer + call->reply_size, len) < 0) | |
665 | BUG(); | |
666 | call->reply_size += len; | |
667 | } | |
668 | ||
05949945 TH |
669 | static void afs_async_workfn(struct work_struct *work) |
670 | { | |
671 | struct afs_call *call = container_of(work, struct afs_call, async_work); | |
672 | ||
673 | call->async_workfn(work); | |
674 | } | |
675 | ||
08e0e7c8 DH |
676 | /* |
677 | * accept the backlog of incoming calls | |
678 | */ | |
679 | static void afs_collect_incoming_call(struct work_struct *work) | |
680 | { | |
681 | struct rxrpc_call *rxcall; | |
682 | struct afs_call *call = NULL; | |
683 | struct sk_buff *skb; | |
684 | ||
685 | while ((skb = skb_dequeue(&afs_incoming_calls))) { | |
686 | _debug("new call"); | |
687 | ||
688 | /* don't need the notification */ | |
00d3b7a4 | 689 | afs_free_skb(skb); |
08e0e7c8 DH |
690 | |
691 | if (!call) { | |
692 | call = kzalloc(sizeof(struct afs_call), GFP_KERNEL); | |
693 | if (!call) { | |
694 | rxrpc_kernel_reject_call(afs_socket); | |
695 | return; | |
696 | } | |
697 | ||
05949945 TH |
698 | call->async_workfn = afs_process_async_call; |
699 | INIT_WORK(&call->async_work, afs_async_workfn); | |
08e0e7c8 DH |
700 | call->wait_mode = &afs_async_incoming_call; |
701 | call->type = &afs_RXCMxxxx; | |
702 | init_waitqueue_head(&call->waitq); | |
703 | skb_queue_head_init(&call->rx_queue); | |
704 | call->state = AFS_CALL_AWAIT_OP_ID; | |
00d3b7a4 DH |
705 | |
706 | _debug("CALL %p{%s} [%d]", | |
707 | call, call->type->name, | |
708 | atomic_read(&afs_outstanding_calls)); | |
709 | atomic_inc(&afs_outstanding_calls); | |
08e0e7c8 DH |
710 | } |
711 | ||
712 | rxcall = rxrpc_kernel_accept_call(afs_socket, | |
713 | (unsigned long) call); | |
714 | if (!IS_ERR(rxcall)) { | |
715 | call->rxcall = rxcall; | |
716 | call = NULL; | |
717 | } | |
718 | } | |
719 | ||
00d3b7a4 DH |
720 | if (call) |
721 | afs_free_call(call); | |
08e0e7c8 DH |
722 | } |
723 | ||
724 | /* | |
725 | * grab the operation ID from an incoming cache manager call | |
726 | */ | |
727 | static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb, | |
728 | bool last) | |
729 | { | |
730 | size_t len = skb->len; | |
731 | void *oibuf = (void *) &call->operation_ID; | |
732 | ||
733 | _enter("{%u},{%zu},%d", call->offset, len, last); | |
734 | ||
735 | ASSERTCMP(call->offset, <, 4); | |
736 | ||
737 | /* the operation ID forms the first four bytes of the request data */ | |
738 | len = min_t(size_t, len, 4 - call->offset); | |
739 | if (skb_copy_bits(skb, 0, oibuf + call->offset, len) < 0) | |
740 | BUG(); | |
741 | if (!pskb_pull(skb, len)) | |
742 | BUG(); | |
743 | call->offset += len; | |
744 | ||
745 | if (call->offset < 4) { | |
746 | if (last) { | |
747 | _leave(" = -EBADMSG [op ID short]"); | |
748 | return -EBADMSG; | |
749 | } | |
750 | _leave(" = 0 [incomplete]"); | |
751 | return 0; | |
752 | } | |
753 | ||
754 | call->state = AFS_CALL_AWAIT_REQUEST; | |
755 | ||
756 | /* ask the cache manager to route the call (it'll change the call type | |
757 | * if successful) */ | |
758 | if (!afs_cm_incoming_call(call)) | |
759 | return -ENOTSUPP; | |
760 | ||
761 | /* pass responsibility for the remainer of this message off to the | |
762 | * cache manager op */ | |
763 | return call->type->deliver(call, skb, last); | |
764 | } | |
765 | ||
766 | /* | |
767 | * send an empty reply | |
768 | */ | |
769 | void afs_send_empty_reply(struct afs_call *call) | |
770 | { | |
771 | struct msghdr msg; | |
772 | struct iovec iov[1]; | |
773 | ||
774 | _enter(""); | |
775 | ||
776 | iov[0].iov_base = NULL; | |
777 | iov[0].iov_len = 0; | |
778 | msg.msg_name = NULL; | |
779 | msg.msg_namelen = 0; | |
780 | msg.msg_iov = iov; | |
781 | msg.msg_iovlen = 0; | |
782 | msg.msg_control = NULL; | |
783 | msg.msg_controllen = 0; | |
784 | msg.msg_flags = 0; | |
785 | ||
786 | call->state = AFS_CALL_AWAIT_ACK; | |
787 | switch (rxrpc_kernel_send_data(call->rxcall, &msg, 0)) { | |
788 | case 0: | |
789 | _leave(" [replied]"); | |
790 | return; | |
791 | ||
792 | case -ENOMEM: | |
793 | _debug("oom"); | |
794 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); | |
795 | default: | |
6c67c7c3 | 796 | afs_end_call(call); |
08e0e7c8 DH |
797 | _leave(" [error]"); |
798 | return; | |
799 | } | |
800 | } | |
801 | ||
b908fe6b DH |
802 | /* |
803 | * send a simple reply | |
804 | */ | |
805 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
806 | { | |
807 | struct msghdr msg; | |
808 | struct iovec iov[1]; | |
bd6dc742 | 809 | int n; |
b908fe6b DH |
810 | |
811 | _enter(""); | |
812 | ||
813 | iov[0].iov_base = (void *) buf; | |
814 | iov[0].iov_len = len; | |
815 | msg.msg_name = NULL; | |
816 | msg.msg_namelen = 0; | |
817 | msg.msg_iov = iov; | |
818 | msg.msg_iovlen = 1; | |
819 | msg.msg_control = NULL; | |
820 | msg.msg_controllen = 0; | |
821 | msg.msg_flags = 0; | |
822 | ||
823 | call->state = AFS_CALL_AWAIT_ACK; | |
bd6dc742 DH |
824 | n = rxrpc_kernel_send_data(call->rxcall, &msg, len); |
825 | if (n >= 0) { | |
6c67c7c3 | 826 | /* Success */ |
b908fe6b DH |
827 | _leave(" [replied]"); |
828 | return; | |
bd6dc742 | 829 | } |
6c67c7c3 | 830 | |
bd6dc742 | 831 | if (n == -ENOMEM) { |
b908fe6b DH |
832 | _debug("oom"); |
833 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); | |
b908fe6b | 834 | } |
6c67c7c3 | 835 | afs_end_call(call); |
bd6dc742 | 836 | _leave(" [error]"); |
b908fe6b DH |
837 | } |
838 | ||
08e0e7c8 DH |
839 | /* |
840 | * extract a piece of data from the received data socket buffers | |
841 | */ | |
842 | int afs_extract_data(struct afs_call *call, struct sk_buff *skb, | |
843 | bool last, void *buf, size_t count) | |
844 | { | |
845 | size_t len = skb->len; | |
846 | ||
847 | _enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count); | |
848 | ||
849 | ASSERTCMP(call->offset, <, count); | |
850 | ||
851 | len = min_t(size_t, len, count - call->offset); | |
852 | if (skb_copy_bits(skb, 0, buf + call->offset, len) < 0 || | |
853 | !pskb_pull(skb, len)) | |
854 | BUG(); | |
855 | call->offset += len; | |
856 | ||
857 | if (call->offset < count) { | |
858 | if (last) { | |
b1bdb691 | 859 | _leave(" = -EBADMSG [%d < %zu]", call->offset, count); |
08e0e7c8 DH |
860 | return -EBADMSG; |
861 | } | |
862 | _leave(" = -EAGAIN"); | |
863 | return -EAGAIN; | |
864 | } | |
865 | return 0; | |
866 | } |