Commit | Line | Data |
---|---|---|
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 | 186 | /* |
6cf12869 | 187 | * End a call but do not free it |
6c67c7c3 | 188 | */ |
6cf12869 | 189 | static void afs_end_call_nofree(struct afs_call *call) |
6c67c7c3 DH |
190 | { |
191 | if (call->rxcall) { | |
192 | rxrpc_kernel_end_call(call->rxcall); | |
193 | call->rxcall = NULL; | |
194 | } | |
6cf12869 NWF |
195 | if (call->type->destructor) |
196 | call->type->destructor(call); | |
197 | } | |
198 | ||
199 | /* | |
200 | * End a call and free it | |
201 | */ | |
202 | static void afs_end_call(struct afs_call *call) | |
203 | { | |
204 | afs_end_call_nofree(call); | |
6c67c7c3 DH |
205 | afs_free_call(call); |
206 | } | |
207 | ||
08e0e7c8 DH |
208 | /* |
209 | * allocate a call with flat request and reply buffers | |
210 | */ | |
211 | struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, | |
212 | size_t request_size, size_t reply_size) | |
213 | { | |
214 | struct afs_call *call; | |
215 | ||
216 | call = kzalloc(sizeof(*call), GFP_NOFS); | |
217 | if (!call) | |
218 | goto nomem_call; | |
219 | ||
00d3b7a4 DH |
220 | _debug("CALL %p{%s} [%d]", |
221 | call, type->name, atomic_read(&afs_outstanding_calls)); | |
222 | atomic_inc(&afs_outstanding_calls); | |
223 | ||
224 | call->type = type; | |
225 | call->request_size = request_size; | |
226 | call->reply_max = reply_size; | |
227 | ||
08e0e7c8 DH |
228 | if (request_size) { |
229 | call->request = kmalloc(request_size, GFP_NOFS); | |
230 | if (!call->request) | |
00d3b7a4 | 231 | goto nomem_free; |
08e0e7c8 DH |
232 | } |
233 | ||
234 | if (reply_size) { | |
235 | call->buffer = kmalloc(reply_size, GFP_NOFS); | |
236 | if (!call->buffer) | |
00d3b7a4 | 237 | goto nomem_free; |
08e0e7c8 DH |
238 | } |
239 | ||
08e0e7c8 DH |
240 | init_waitqueue_head(&call->waitq); |
241 | skb_queue_head_init(&call->rx_queue); | |
242 | return call; | |
243 | ||
00d3b7a4 DH |
244 | nomem_free: |
245 | afs_free_call(call); | |
08e0e7c8 DH |
246 | nomem_call: |
247 | return NULL; | |
248 | } | |
249 | ||
250 | /* | |
251 | * clean up a call with flat buffer | |
252 | */ | |
253 | void afs_flat_call_destructor(struct afs_call *call) | |
254 | { | |
255 | _enter(""); | |
256 | ||
257 | kfree(call->request); | |
258 | call->request = NULL; | |
259 | kfree(call->buffer); | |
260 | call->buffer = NULL; | |
261 | } | |
262 | ||
31143d5d DH |
263 | /* |
264 | * attach the data from a bunch of pages on an inode to a call | |
265 | */ | |
c1206a2c AB |
266 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg, |
267 | struct kvec *iov) | |
31143d5d DH |
268 | { |
269 | struct page *pages[8]; | |
270 | unsigned count, n, loop, offset, to; | |
271 | pgoff_t first = call->first, last = call->last; | |
272 | int ret; | |
273 | ||
274 | _enter(""); | |
275 | ||
276 | offset = call->first_offset; | |
277 | call->first_offset = 0; | |
278 | ||
279 | do { | |
280 | _debug("attach %lx-%lx", first, last); | |
281 | ||
282 | count = last - first + 1; | |
283 | if (count > ARRAY_SIZE(pages)) | |
284 | count = ARRAY_SIZE(pages); | |
285 | n = find_get_pages_contig(call->mapping, first, count, pages); | |
286 | ASSERTCMP(n, ==, count); | |
287 | ||
288 | loop = 0; | |
289 | do { | |
290 | msg->msg_flags = 0; | |
291 | to = PAGE_SIZE; | |
292 | if (first + loop >= last) | |
293 | to = call->last_to; | |
294 | else | |
295 | msg->msg_flags = MSG_MORE; | |
296 | iov->iov_base = kmap(pages[loop]) + offset; | |
297 | iov->iov_len = to - offset; | |
298 | offset = 0; | |
299 | ||
300 | _debug("- range %u-%u%s", | |
301 | offset, to, msg->msg_flags ? " [more]" : ""); | |
302 | msg->msg_iov = (struct iovec *) iov; | |
303 | msg->msg_iovlen = 1; | |
304 | ||
305 | /* have to change the state *before* sending the last | |
306 | * packet as RxRPC might give us the reply before it | |
307 | * returns from sending the request */ | |
308 | if (first + loop >= last) | |
309 | call->state = AFS_CALL_AWAIT_REPLY; | |
310 | ret = rxrpc_kernel_send_data(call->rxcall, msg, | |
311 | to - offset); | |
312 | kunmap(pages[loop]); | |
313 | if (ret < 0) | |
314 | break; | |
315 | } while (++loop < count); | |
316 | first += count; | |
317 | ||
318 | for (loop = 0; loop < count; loop++) | |
319 | put_page(pages[loop]); | |
320 | if (ret < 0) | |
321 | break; | |
5bbf5d39 | 322 | } while (first <= last); |
31143d5d DH |
323 | |
324 | _leave(" = %d", ret); | |
325 | return ret; | |
326 | } | |
327 | ||
08e0e7c8 DH |
328 | /* |
329 | * initiate a call | |
330 | */ | |
331 | int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, | |
332 | const struct afs_wait_mode *wait_mode) | |
333 | { | |
334 | struct sockaddr_rxrpc srx; | |
335 | struct rxrpc_call *rxcall; | |
336 | struct msghdr msg; | |
337 | struct kvec iov[1]; | |
338 | int ret; | |
c0173863 | 339 | struct sk_buff *skb; |
08e0e7c8 DH |
340 | |
341 | _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); | |
342 | ||
00d3b7a4 DH |
343 | ASSERT(call->type != NULL); |
344 | ASSERT(call->type->name != NULL); | |
345 | ||
31143d5d DH |
346 | _debug("____MAKE %p{%s,%x} [%d]____", |
347 | call, call->type->name, key_serial(call->key), | |
348 | atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 | 349 | |
08e0e7c8 DH |
350 | call->wait_mode = wait_mode; |
351 | INIT_WORK(&call->async_work, afs_process_async_call); | |
352 | ||
353 | memset(&srx, 0, sizeof(srx)); | |
354 | srx.srx_family = AF_RXRPC; | |
355 | srx.srx_service = call->service_id; | |
356 | srx.transport_type = SOCK_DGRAM; | |
357 | srx.transport_len = sizeof(srx.transport.sin); | |
358 | srx.transport.sin.sin_family = AF_INET; | |
359 | srx.transport.sin.sin_port = call->port; | |
360 | memcpy(&srx.transport.sin.sin_addr, addr, 4); | |
361 | ||
362 | /* create a call */ | |
363 | rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, | |
364 | (unsigned long) call, gfp); | |
00d3b7a4 | 365 | call->key = NULL; |
08e0e7c8 DH |
366 | if (IS_ERR(rxcall)) { |
367 | ret = PTR_ERR(rxcall); | |
368 | goto error_kill_call; | |
369 | } | |
370 | ||
371 | call->rxcall = rxcall; | |
372 | ||
373 | /* send the request */ | |
374 | iov[0].iov_base = call->request; | |
375 | iov[0].iov_len = call->request_size; | |
376 | ||
377 | msg.msg_name = NULL; | |
378 | msg.msg_namelen = 0; | |
379 | msg.msg_iov = (struct iovec *) iov; | |
380 | msg.msg_iovlen = 1; | |
381 | msg.msg_control = NULL; | |
382 | msg.msg_controllen = 0; | |
31143d5d | 383 | msg.msg_flags = (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 DH |
384 | |
385 | /* have to change the state *before* sending the last packet as RxRPC | |
386 | * might give us the reply before it returns from sending the | |
387 | * request */ | |
31143d5d DH |
388 | if (!call->send_pages) |
389 | call->state = AFS_CALL_AWAIT_REPLY; | |
08e0e7c8 DH |
390 | ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size); |
391 | if (ret < 0) | |
392 | goto error_do_abort; | |
393 | ||
31143d5d DH |
394 | if (call->send_pages) { |
395 | ret = afs_send_pages(call, &msg, iov); | |
396 | if (ret < 0) | |
397 | goto error_do_abort; | |
398 | } | |
399 | ||
08e0e7c8 DH |
400 | /* at this point, an async call may no longer exist as it may have |
401 | * already completed */ | |
402 | return wait_mode->wait(call); | |
403 | ||
404 | error_do_abort: | |
405 | rxrpc_kernel_abort_call(rxcall, RX_USER_ABORT); | |
c0173863 AB |
406 | while ((skb = skb_dequeue(&call->rx_queue))) |
407 | afs_free_skb(skb); | |
08e0e7c8 | 408 | error_kill_call: |
6c67c7c3 | 409 | afs_end_call(call); |
08e0e7c8 DH |
410 | _leave(" = %d", ret); |
411 | return ret; | |
412 | } | |
413 | ||
414 | /* | |
415 | * handles intercepted messages that were arriving in the socket's Rx queue | |
416 | * - called with the socket receive queue lock held to ensure message ordering | |
417 | * - called with softirqs disabled | |
418 | */ | |
419 | static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID, | |
420 | struct sk_buff *skb) | |
421 | { | |
422 | struct afs_call *call = (struct afs_call *) user_call_ID; | |
423 | ||
424 | _enter("%p,,%u", call, skb->mark); | |
425 | ||
00d3b7a4 DH |
426 | _debug("ICPT %p{%u} [%d]", |
427 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
428 | ||
08e0e7c8 | 429 | ASSERTCMP(sk, ==, afs_socket->sk); |
00d3b7a4 | 430 | atomic_inc(&afs_outstanding_skbs); |
08e0e7c8 DH |
431 | |
432 | if (!call) { | |
433 | /* its an incoming call for our callback service */ | |
00d3b7a4 | 434 | skb_queue_tail(&afs_incoming_calls, skb); |
0ad53eee | 435 | queue_work(afs_wq, &afs_collect_incoming_call_work); |
08e0e7c8 DH |
436 | } else { |
437 | /* route the messages directly to the appropriate call */ | |
00d3b7a4 | 438 | skb_queue_tail(&call->rx_queue, skb); |
08e0e7c8 DH |
439 | call->wait_mode->rx_wakeup(call); |
440 | } | |
441 | ||
442 | _leave(""); | |
443 | } | |
444 | ||
445 | /* | |
446 | * deliver messages to a call | |
447 | */ | |
448 | static void afs_deliver_to_call(struct afs_call *call) | |
449 | { | |
450 | struct sk_buff *skb; | |
451 | bool last; | |
452 | u32 abort_code; | |
453 | int ret; | |
454 | ||
455 | _enter(""); | |
456 | ||
457 | while ((call->state == AFS_CALL_AWAIT_REPLY || | |
458 | call->state == AFS_CALL_AWAIT_OP_ID || | |
459 | call->state == AFS_CALL_AWAIT_REQUEST || | |
460 | call->state == AFS_CALL_AWAIT_ACK) && | |
461 | (skb = skb_dequeue(&call->rx_queue))) { | |
462 | switch (skb->mark) { | |
463 | case RXRPC_SKB_MARK_DATA: | |
464 | _debug("Rcv DATA"); | |
465 | last = rxrpc_kernel_is_data_last(skb); | |
466 | ret = call->type->deliver(call, skb, last); | |
467 | switch (ret) { | |
468 | case 0: | |
469 | if (last && | |
470 | call->state == AFS_CALL_AWAIT_REPLY) | |
471 | call->state = AFS_CALL_COMPLETE; | |
472 | break; | |
473 | case -ENOTCONN: | |
474 | abort_code = RX_CALL_DEAD; | |
475 | goto do_abort; | |
476 | case -ENOTSUPP: | |
477 | abort_code = RX_INVALID_OPERATION; | |
478 | goto do_abort; | |
479 | default: | |
480 | abort_code = RXGEN_CC_UNMARSHAL; | |
481 | if (call->state != AFS_CALL_AWAIT_REPLY) | |
482 | abort_code = RXGEN_SS_UNMARSHAL; | |
483 | do_abort: | |
484 | rxrpc_kernel_abort_call(call->rxcall, | |
485 | abort_code); | |
486 | call->error = ret; | |
487 | call->state = AFS_CALL_ERROR; | |
488 | break; | |
489 | } | |
00d3b7a4 | 490 | afs_data_delivered(skb); |
08e0e7c8 | 491 | skb = NULL; |
00d3b7a4 | 492 | continue; |
08e0e7c8 DH |
493 | case RXRPC_SKB_MARK_FINAL_ACK: |
494 | _debug("Rcv ACK"); | |
495 | call->state = AFS_CALL_COMPLETE; | |
496 | break; | |
497 | case RXRPC_SKB_MARK_BUSY: | |
498 | _debug("Rcv BUSY"); | |
499 | call->error = -EBUSY; | |
500 | call->state = AFS_CALL_BUSY; | |
501 | break; | |
502 | case RXRPC_SKB_MARK_REMOTE_ABORT: | |
503 | abort_code = rxrpc_kernel_get_abort_code(skb); | |
504 | call->error = call->type->abort_to_error(abort_code); | |
505 | call->state = AFS_CALL_ABORTED; | |
506 | _debug("Rcv ABORT %u -> %d", abort_code, call->error); | |
507 | break; | |
508 | case RXRPC_SKB_MARK_NET_ERROR: | |
509 | call->error = -rxrpc_kernel_get_error_number(skb); | |
510 | call->state = AFS_CALL_ERROR; | |
511 | _debug("Rcv NET ERROR %d", call->error); | |
512 | break; | |
513 | case RXRPC_SKB_MARK_LOCAL_ERROR: | |
514 | call->error = -rxrpc_kernel_get_error_number(skb); | |
515 | call->state = AFS_CALL_ERROR; | |
516 | _debug("Rcv LOCAL ERROR %d", call->error); | |
517 | break; | |
518 | default: | |
519 | BUG(); | |
520 | break; | |
521 | } | |
522 | ||
00d3b7a4 | 523 | afs_free_skb(skb); |
08e0e7c8 DH |
524 | } |
525 | ||
526 | /* make sure the queue is empty if the call is done with (we might have | |
527 | * aborted the call early because of an unmarshalling error) */ | |
528 | if (call->state >= AFS_CALL_COMPLETE) { | |
529 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 530 | afs_free_skb(skb); |
6c67c7c3 DH |
531 | if (call->incoming) |
532 | afs_end_call(call); | |
08e0e7c8 DH |
533 | } |
534 | ||
535 | _leave(""); | |
536 | } | |
537 | ||
538 | /* | |
539 | * wait synchronously for a call to complete | |
540 | */ | |
541 | static int afs_wait_for_call_to_complete(struct afs_call *call) | |
542 | { | |
543 | struct sk_buff *skb; | |
544 | int ret; | |
545 | ||
546 | DECLARE_WAITQUEUE(myself, current); | |
547 | ||
548 | _enter(""); | |
549 | ||
550 | add_wait_queue(&call->waitq, &myself); | |
551 | for (;;) { | |
552 | set_current_state(TASK_INTERRUPTIBLE); | |
553 | ||
554 | /* deliver any messages that are in the queue */ | |
555 | if (!skb_queue_empty(&call->rx_queue)) { | |
556 | __set_current_state(TASK_RUNNING); | |
557 | afs_deliver_to_call(call); | |
558 | continue; | |
559 | } | |
560 | ||
561 | ret = call->error; | |
562 | if (call->state >= AFS_CALL_COMPLETE) | |
563 | break; | |
564 | ret = -EINTR; | |
565 | if (signal_pending(current)) | |
566 | break; | |
567 | schedule(); | |
568 | } | |
569 | ||
570 | remove_wait_queue(&call->waitq, &myself); | |
571 | __set_current_state(TASK_RUNNING); | |
572 | ||
573 | /* kill the call */ | |
574 | if (call->state < AFS_CALL_COMPLETE) { | |
575 | _debug("call incomplete"); | |
576 | rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD); | |
577 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 578 | afs_free_skb(skb); |
08e0e7c8 DH |
579 | } |
580 | ||
581 | _debug("call complete"); | |
6c67c7c3 | 582 | afs_end_call(call); |
08e0e7c8 DH |
583 | _leave(" = %d", ret); |
584 | return ret; | |
585 | } | |
586 | ||
587 | /* | |
588 | * wake up a waiting call | |
589 | */ | |
590 | static void afs_wake_up_call_waiter(struct afs_call *call) | |
591 | { | |
592 | wake_up(&call->waitq); | |
593 | } | |
594 | ||
595 | /* | |
596 | * wake up an asynchronous call | |
597 | */ | |
598 | static void afs_wake_up_async_call(struct afs_call *call) | |
599 | { | |
600 | _enter(""); | |
601 | queue_work(afs_async_calls, &call->async_work); | |
602 | } | |
603 | ||
604 | /* | |
605 | * put a call into asynchronous mode | |
606 | * - mustn't touch the call descriptor as the call my have completed by the | |
607 | * time we get here | |
608 | */ | |
609 | static int afs_dont_wait_for_call_to_complete(struct afs_call *call) | |
610 | { | |
611 | _enter(""); | |
612 | return -EINPROGRESS; | |
613 | } | |
614 | ||
615 | /* | |
616 | * delete an asynchronous call | |
617 | */ | |
618 | static void afs_delete_async_call(struct work_struct *work) | |
619 | { | |
620 | struct afs_call *call = | |
621 | container_of(work, struct afs_call, async_work); | |
622 | ||
623 | _enter(""); | |
624 | ||
00d3b7a4 | 625 | afs_free_call(call); |
08e0e7c8 DH |
626 | |
627 | _leave(""); | |
628 | } | |
629 | ||
630 | /* | |
631 | * perform processing on an asynchronous call | |
632 | * - on a multiple-thread workqueue this work item may try to run on several | |
633 | * CPUs at the same time | |
634 | */ | |
635 | static void afs_process_async_call(struct work_struct *work) | |
636 | { | |
637 | struct afs_call *call = | |
638 | container_of(work, struct afs_call, async_work); | |
639 | ||
640 | _enter(""); | |
641 | ||
642 | if (!skb_queue_empty(&call->rx_queue)) | |
643 | afs_deliver_to_call(call); | |
644 | ||
645 | if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) { | |
646 | if (call->wait_mode->async_complete) | |
647 | call->wait_mode->async_complete(call->reply, | |
648 | call->error); | |
649 | call->reply = NULL; | |
650 | ||
651 | /* kill the call */ | |
6cf12869 | 652 | afs_end_call_nofree(call); |
08e0e7c8 DH |
653 | |
654 | /* we can't just delete the call because the work item may be | |
655 | * queued */ | |
05949945 | 656 | call->async_workfn = afs_delete_async_call; |
08e0e7c8 DH |
657 | queue_work(afs_async_calls, &call->async_work); |
658 | } | |
659 | ||
660 | _leave(""); | |
661 | } | |
662 | ||
663 | /* | |
664 | * empty a socket buffer into a flat reply buffer | |
665 | */ | |
666 | void afs_transfer_reply(struct afs_call *call, struct sk_buff *skb) | |
667 | { | |
668 | size_t len = skb->len; | |
669 | ||
670 | if (skb_copy_bits(skb, 0, call->buffer + call->reply_size, len) < 0) | |
671 | BUG(); | |
672 | call->reply_size += len; | |
673 | } | |
674 | ||
05949945 TH |
675 | static void afs_async_workfn(struct work_struct *work) |
676 | { | |
677 | struct afs_call *call = container_of(work, struct afs_call, async_work); | |
678 | ||
679 | call->async_workfn(work); | |
680 | } | |
681 | ||
08e0e7c8 DH |
682 | /* |
683 | * accept the backlog of incoming calls | |
684 | */ | |
685 | static void afs_collect_incoming_call(struct work_struct *work) | |
686 | { | |
687 | struct rxrpc_call *rxcall; | |
688 | struct afs_call *call = NULL; | |
689 | struct sk_buff *skb; | |
690 | ||
691 | while ((skb = skb_dequeue(&afs_incoming_calls))) { | |
692 | _debug("new call"); | |
693 | ||
694 | /* don't need the notification */ | |
00d3b7a4 | 695 | afs_free_skb(skb); |
08e0e7c8 DH |
696 | |
697 | if (!call) { | |
698 | call = kzalloc(sizeof(struct afs_call), GFP_KERNEL); | |
699 | if (!call) { | |
700 | rxrpc_kernel_reject_call(afs_socket); | |
701 | return; | |
702 | } | |
703 | ||
05949945 TH |
704 | call->async_workfn = afs_process_async_call; |
705 | INIT_WORK(&call->async_work, afs_async_workfn); | |
08e0e7c8 DH |
706 | call->wait_mode = &afs_async_incoming_call; |
707 | call->type = &afs_RXCMxxxx; | |
708 | init_waitqueue_head(&call->waitq); | |
709 | skb_queue_head_init(&call->rx_queue); | |
710 | call->state = AFS_CALL_AWAIT_OP_ID; | |
00d3b7a4 DH |
711 | |
712 | _debug("CALL %p{%s} [%d]", | |
713 | call, call->type->name, | |
714 | atomic_read(&afs_outstanding_calls)); | |
715 | atomic_inc(&afs_outstanding_calls); | |
08e0e7c8 DH |
716 | } |
717 | ||
718 | rxcall = rxrpc_kernel_accept_call(afs_socket, | |
719 | (unsigned long) call); | |
720 | if (!IS_ERR(rxcall)) { | |
721 | call->rxcall = rxcall; | |
722 | call = NULL; | |
723 | } | |
724 | } | |
725 | ||
00d3b7a4 DH |
726 | if (call) |
727 | afs_free_call(call); | |
08e0e7c8 DH |
728 | } |
729 | ||
730 | /* | |
731 | * grab the operation ID from an incoming cache manager call | |
732 | */ | |
733 | static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb, | |
734 | bool last) | |
735 | { | |
736 | size_t len = skb->len; | |
737 | void *oibuf = (void *) &call->operation_ID; | |
738 | ||
739 | _enter("{%u},{%zu},%d", call->offset, len, last); | |
740 | ||
741 | ASSERTCMP(call->offset, <, 4); | |
742 | ||
743 | /* the operation ID forms the first four bytes of the request data */ | |
744 | len = min_t(size_t, len, 4 - call->offset); | |
745 | if (skb_copy_bits(skb, 0, oibuf + call->offset, len) < 0) | |
746 | BUG(); | |
747 | if (!pskb_pull(skb, len)) | |
748 | BUG(); | |
749 | call->offset += len; | |
750 | ||
751 | if (call->offset < 4) { | |
752 | if (last) { | |
753 | _leave(" = -EBADMSG [op ID short]"); | |
754 | return -EBADMSG; | |
755 | } | |
756 | _leave(" = 0 [incomplete]"); | |
757 | return 0; | |
758 | } | |
759 | ||
760 | call->state = AFS_CALL_AWAIT_REQUEST; | |
761 | ||
762 | /* ask the cache manager to route the call (it'll change the call type | |
763 | * if successful) */ | |
764 | if (!afs_cm_incoming_call(call)) | |
765 | return -ENOTSUPP; | |
766 | ||
767 | /* pass responsibility for the remainer of this message off to the | |
768 | * cache manager op */ | |
769 | return call->type->deliver(call, skb, last); | |
770 | } | |
771 | ||
772 | /* | |
773 | * send an empty reply | |
774 | */ | |
775 | void afs_send_empty_reply(struct afs_call *call) | |
776 | { | |
777 | struct msghdr msg; | |
778 | struct iovec iov[1]; | |
779 | ||
780 | _enter(""); | |
781 | ||
782 | iov[0].iov_base = NULL; | |
783 | iov[0].iov_len = 0; | |
784 | msg.msg_name = NULL; | |
785 | msg.msg_namelen = 0; | |
786 | msg.msg_iov = iov; | |
787 | msg.msg_iovlen = 0; | |
788 | msg.msg_control = NULL; | |
789 | msg.msg_controllen = 0; | |
790 | msg.msg_flags = 0; | |
791 | ||
792 | call->state = AFS_CALL_AWAIT_ACK; | |
793 | switch (rxrpc_kernel_send_data(call->rxcall, &msg, 0)) { | |
794 | case 0: | |
795 | _leave(" [replied]"); | |
796 | return; | |
797 | ||
798 | case -ENOMEM: | |
799 | _debug("oom"); | |
800 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); | |
801 | default: | |
6c67c7c3 | 802 | afs_end_call(call); |
08e0e7c8 DH |
803 | _leave(" [error]"); |
804 | return; | |
805 | } | |
806 | } | |
807 | ||
b908fe6b DH |
808 | /* |
809 | * send a simple reply | |
810 | */ | |
811 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
812 | { | |
813 | struct msghdr msg; | |
814 | struct iovec iov[1]; | |
bd6dc742 | 815 | int n; |
b908fe6b DH |
816 | |
817 | _enter(""); | |
818 | ||
819 | iov[0].iov_base = (void *) buf; | |
820 | iov[0].iov_len = len; | |
821 | msg.msg_name = NULL; | |
822 | msg.msg_namelen = 0; | |
823 | msg.msg_iov = iov; | |
824 | msg.msg_iovlen = 1; | |
825 | msg.msg_control = NULL; | |
826 | msg.msg_controllen = 0; | |
827 | msg.msg_flags = 0; | |
828 | ||
829 | call->state = AFS_CALL_AWAIT_ACK; | |
bd6dc742 DH |
830 | n = rxrpc_kernel_send_data(call->rxcall, &msg, len); |
831 | if (n >= 0) { | |
6c67c7c3 | 832 | /* Success */ |
b908fe6b DH |
833 | _leave(" [replied]"); |
834 | return; | |
bd6dc742 | 835 | } |
6c67c7c3 | 836 | |
bd6dc742 | 837 | if (n == -ENOMEM) { |
b908fe6b DH |
838 | _debug("oom"); |
839 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); | |
b908fe6b | 840 | } |
6c67c7c3 | 841 | afs_end_call(call); |
bd6dc742 | 842 | _leave(" [error]"); |
b908fe6b DH |
843 | } |
844 | ||
08e0e7c8 DH |
845 | /* |
846 | * extract a piece of data from the received data socket buffers | |
847 | */ | |
848 | int afs_extract_data(struct afs_call *call, struct sk_buff *skb, | |
849 | bool last, void *buf, size_t count) | |
850 | { | |
851 | size_t len = skb->len; | |
852 | ||
853 | _enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count); | |
854 | ||
855 | ASSERTCMP(call->offset, <, count); | |
856 | ||
857 | len = min_t(size_t, len, count - call->offset); | |
858 | if (skb_copy_bits(skb, 0, buf + call->offset, len) < 0 || | |
859 | !pskb_pull(skb, len)) | |
860 | BUG(); | |
861 | call->offset += len; | |
862 | ||
863 | if (call->offset < count) { | |
864 | if (last) { | |
b1bdb691 | 865 | _leave(" = -EBADMSG [%d < %zu]", call->offset, count); |
08e0e7c8 DH |
866 | return -EBADMSG; |
867 | } | |
868 | _leave(" = -EAGAIN"); | |
869 | return -EAGAIN; | |
870 | } | |
871 | return 0; | |
872 | } |