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