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 *); | |
656f88dd | 28 | static void afs_process_async_call(struct afs_call *); |
08e0e7c8 DH |
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 | ||
150a6b47 NWF |
61 | static void afs_async_workfn(struct work_struct *work) |
62 | { | |
63 | struct afs_call *call = container_of(work, struct afs_call, async_work); | |
64 | ||
656f88dd | 65 | call->async_workfn(call); |
150a6b47 NWF |
66 | } |
67 | ||
2f02f7ae DH |
68 | static int afs_wait_atomic_t(atomic_t *p) |
69 | { | |
70 | schedule(); | |
71 | return 0; | |
72 | } | |
73 | ||
08e0e7c8 DH |
74 | /* |
75 | * open an RxRPC socket and bind it to be a server for callback notifications | |
76 | * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT | |
77 | */ | |
78 | int afs_open_socket(void) | |
79 | { | |
80 | struct sockaddr_rxrpc srx; | |
81 | struct socket *socket; | |
82 | int ret; | |
83 | ||
84 | _enter(""); | |
85 | ||
86 | skb_queue_head_init(&afs_incoming_calls); | |
87 | ||
88 | afs_async_calls = create_singlethread_workqueue("kafsd"); | |
89 | if (!afs_async_calls) { | |
90 | _leave(" = -ENOMEM [wq]"); | |
91 | return -ENOMEM; | |
92 | } | |
93 | ||
eeb1bd5c | 94 | ret = sock_create_kern(&init_net, AF_RXRPC, SOCK_DGRAM, PF_INET, &socket); |
08e0e7c8 DH |
95 | if (ret < 0) { |
96 | destroy_workqueue(afs_async_calls); | |
97 | _leave(" = %d [socket]", ret); | |
98 | return ret; | |
99 | } | |
100 | ||
101 | socket->sk->sk_allocation = GFP_NOFS; | |
102 | ||
103 | /* bind the callback manager's address to make this a server socket */ | |
104 | srx.srx_family = AF_RXRPC; | |
105 | srx.srx_service = CM_SERVICE; | |
106 | srx.transport_type = SOCK_DGRAM; | |
107 | srx.transport_len = sizeof(srx.transport.sin); | |
108 | srx.transport.sin.sin_family = AF_INET; | |
109 | srx.transport.sin.sin_port = htons(AFS_CM_PORT); | |
110 | memset(&srx.transport.sin.sin_addr, 0, | |
111 | sizeof(srx.transport.sin.sin_addr)); | |
112 | ||
113 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); | |
114 | if (ret < 0) { | |
115 | sock_release(socket); | |
bebf8cfa | 116 | destroy_workqueue(afs_async_calls); |
08e0e7c8 DH |
117 | _leave(" = %d [bind]", ret); |
118 | return ret; | |
119 | } | |
120 | ||
121 | rxrpc_kernel_intercept_rx_messages(socket, afs_rx_interceptor); | |
122 | ||
123 | afs_socket = socket; | |
124 | _leave(" = 0"); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* | |
129 | * close the RxRPC socket AFS was using | |
130 | */ | |
131 | void afs_close_socket(void) | |
132 | { | |
133 | _enter(""); | |
134 | ||
2f02f7ae DH |
135 | wait_on_atomic_t(&afs_outstanding_calls, afs_wait_atomic_t, |
136 | TASK_UNINTERRUPTIBLE); | |
137 | _debug("no outstanding calls"); | |
138 | ||
08e0e7c8 DH |
139 | sock_release(afs_socket); |
140 | ||
141 | _debug("dework"); | |
142 | destroy_workqueue(afs_async_calls); | |
00d3b7a4 DH |
143 | |
144 | ASSERTCMP(atomic_read(&afs_outstanding_skbs), ==, 0); | |
08e0e7c8 DH |
145 | _leave(""); |
146 | } | |
147 | ||
00d3b7a4 DH |
148 | /* |
149 | * note that the data in a socket buffer is now delivered and that the buffer | |
150 | * should be freed | |
151 | */ | |
152 | static void afs_data_delivered(struct sk_buff *skb) | |
153 | { | |
154 | if (!skb) { | |
155 | _debug("DLVR NULL [%d]", atomic_read(&afs_outstanding_skbs)); | |
156 | dump_stack(); | |
157 | } else { | |
158 | _debug("DLVR %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_data_delivered(skb); | |
163 | } | |
164 | } | |
165 | ||
166 | /* | |
167 | * free a socket buffer | |
168 | */ | |
169 | static void afs_free_skb(struct sk_buff *skb) | |
170 | { | |
171 | if (!skb) { | |
172 | _debug("FREE NULL [%d]", atomic_read(&afs_outstanding_skbs)); | |
173 | dump_stack(); | |
174 | } else { | |
175 | _debug("FREE %p{%u} [%d]", | |
176 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
177 | if (atomic_dec_return(&afs_outstanding_skbs) == -1) | |
178 | BUG(); | |
179 | rxrpc_kernel_free_skb(skb); | |
180 | } | |
181 | } | |
182 | ||
183 | /* | |
184 | * free a call | |
185 | */ | |
186 | static void afs_free_call(struct afs_call *call) | |
187 | { | |
188 | _debug("DONE %p{%s} [%d]", | |
189 | call, call->type->name, atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 DH |
190 | |
191 | ASSERTCMP(call->rxcall, ==, NULL); | |
192 | ASSERT(!work_pending(&call->async_work)); | |
193 | ASSERT(skb_queue_empty(&call->rx_queue)); | |
194 | ASSERT(call->type->name != NULL); | |
195 | ||
196 | kfree(call->request); | |
197 | kfree(call); | |
2f02f7ae DH |
198 | |
199 | if (atomic_dec_and_test(&afs_outstanding_calls)) | |
200 | wake_up_atomic_t(&afs_outstanding_calls); | |
00d3b7a4 DH |
201 | } |
202 | ||
6c67c7c3 | 203 | /* |
6cf12869 | 204 | * End a call but do not free it |
6c67c7c3 | 205 | */ |
6cf12869 | 206 | static void afs_end_call_nofree(struct afs_call *call) |
6c67c7c3 DH |
207 | { |
208 | if (call->rxcall) { | |
209 | rxrpc_kernel_end_call(call->rxcall); | |
210 | call->rxcall = NULL; | |
211 | } | |
6cf12869 NWF |
212 | if (call->type->destructor) |
213 | call->type->destructor(call); | |
214 | } | |
215 | ||
216 | /* | |
217 | * End a call and free it | |
218 | */ | |
219 | static void afs_end_call(struct afs_call *call) | |
220 | { | |
221 | afs_end_call_nofree(call); | |
6c67c7c3 DH |
222 | afs_free_call(call); |
223 | } | |
224 | ||
08e0e7c8 DH |
225 | /* |
226 | * allocate a call with flat request and reply buffers | |
227 | */ | |
228 | struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, | |
229 | size_t request_size, size_t reply_size) | |
230 | { | |
231 | struct afs_call *call; | |
232 | ||
233 | call = kzalloc(sizeof(*call), GFP_NOFS); | |
234 | if (!call) | |
235 | goto nomem_call; | |
236 | ||
00d3b7a4 DH |
237 | _debug("CALL %p{%s} [%d]", |
238 | call, type->name, atomic_read(&afs_outstanding_calls)); | |
239 | atomic_inc(&afs_outstanding_calls); | |
240 | ||
241 | call->type = type; | |
242 | call->request_size = request_size; | |
243 | call->reply_max = reply_size; | |
244 | ||
08e0e7c8 DH |
245 | if (request_size) { |
246 | call->request = kmalloc(request_size, GFP_NOFS); | |
247 | if (!call->request) | |
00d3b7a4 | 248 | goto nomem_free; |
08e0e7c8 DH |
249 | } |
250 | ||
251 | if (reply_size) { | |
252 | call->buffer = kmalloc(reply_size, GFP_NOFS); | |
253 | if (!call->buffer) | |
00d3b7a4 | 254 | goto nomem_free; |
08e0e7c8 DH |
255 | } |
256 | ||
08e0e7c8 DH |
257 | init_waitqueue_head(&call->waitq); |
258 | skb_queue_head_init(&call->rx_queue); | |
259 | return call; | |
260 | ||
00d3b7a4 DH |
261 | nomem_free: |
262 | afs_free_call(call); | |
08e0e7c8 DH |
263 | nomem_call: |
264 | return NULL; | |
265 | } | |
266 | ||
267 | /* | |
268 | * clean up a call with flat buffer | |
269 | */ | |
270 | void afs_flat_call_destructor(struct afs_call *call) | |
271 | { | |
272 | _enter(""); | |
273 | ||
274 | kfree(call->request); | |
275 | call->request = NULL; | |
276 | kfree(call->buffer); | |
277 | call->buffer = NULL; | |
278 | } | |
279 | ||
31143d5d DH |
280 | /* |
281 | * attach the data from a bunch of pages on an inode to a call | |
282 | */ | |
c1206a2c AB |
283 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg, |
284 | struct kvec *iov) | |
31143d5d DH |
285 | { |
286 | struct page *pages[8]; | |
287 | unsigned count, n, loop, offset, to; | |
288 | pgoff_t first = call->first, last = call->last; | |
289 | int ret; | |
290 | ||
291 | _enter(""); | |
292 | ||
293 | offset = call->first_offset; | |
294 | call->first_offset = 0; | |
295 | ||
296 | do { | |
297 | _debug("attach %lx-%lx", first, last); | |
298 | ||
299 | count = last - first + 1; | |
300 | if (count > ARRAY_SIZE(pages)) | |
301 | count = ARRAY_SIZE(pages); | |
302 | n = find_get_pages_contig(call->mapping, first, count, pages); | |
303 | ASSERTCMP(n, ==, count); | |
304 | ||
305 | loop = 0; | |
306 | do { | |
307 | msg->msg_flags = 0; | |
308 | to = PAGE_SIZE; | |
309 | if (first + loop >= last) | |
310 | to = call->last_to; | |
311 | else | |
312 | msg->msg_flags = MSG_MORE; | |
313 | iov->iov_base = kmap(pages[loop]) + offset; | |
314 | iov->iov_len = to - offset; | |
315 | offset = 0; | |
316 | ||
317 | _debug("- range %u-%u%s", | |
318 | offset, to, msg->msg_flags ? " [more]" : ""); | |
2e90b1c4 AV |
319 | iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, |
320 | iov, 1, to - offset); | |
31143d5d DH |
321 | |
322 | /* have to change the state *before* sending the last | |
323 | * packet as RxRPC might give us the reply before it | |
324 | * returns from sending the request */ | |
325 | if (first + loop >= last) | |
326 | call->state = AFS_CALL_AWAIT_REPLY; | |
327 | ret = rxrpc_kernel_send_data(call->rxcall, msg, | |
328 | to - offset); | |
329 | kunmap(pages[loop]); | |
330 | if (ret < 0) | |
331 | break; | |
332 | } while (++loop < count); | |
333 | first += count; | |
334 | ||
335 | for (loop = 0; loop < count; loop++) | |
336 | put_page(pages[loop]); | |
337 | if (ret < 0) | |
338 | break; | |
5bbf5d39 | 339 | } while (first <= last); |
31143d5d DH |
340 | |
341 | _leave(" = %d", ret); | |
342 | return ret; | |
343 | } | |
344 | ||
08e0e7c8 DH |
345 | /* |
346 | * initiate a call | |
347 | */ | |
348 | int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, | |
349 | const struct afs_wait_mode *wait_mode) | |
350 | { | |
351 | struct sockaddr_rxrpc srx; | |
352 | struct rxrpc_call *rxcall; | |
353 | struct msghdr msg; | |
354 | struct kvec iov[1]; | |
355 | int ret; | |
c0173863 | 356 | struct sk_buff *skb; |
08e0e7c8 DH |
357 | |
358 | _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); | |
359 | ||
00d3b7a4 DH |
360 | ASSERT(call->type != NULL); |
361 | ASSERT(call->type->name != NULL); | |
362 | ||
31143d5d DH |
363 | _debug("____MAKE %p{%s,%x} [%d]____", |
364 | call, call->type->name, key_serial(call->key), | |
365 | atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 | 366 | |
08e0e7c8 | 367 | call->wait_mode = wait_mode; |
150a6b47 NWF |
368 | call->async_workfn = afs_process_async_call; |
369 | INIT_WORK(&call->async_work, afs_async_workfn); | |
08e0e7c8 DH |
370 | |
371 | memset(&srx, 0, sizeof(srx)); | |
372 | srx.srx_family = AF_RXRPC; | |
373 | srx.srx_service = call->service_id; | |
374 | srx.transport_type = SOCK_DGRAM; | |
375 | srx.transport_len = sizeof(srx.transport.sin); | |
376 | srx.transport.sin.sin_family = AF_INET; | |
377 | srx.transport.sin.sin_port = call->port; | |
378 | memcpy(&srx.transport.sin.sin_addr, addr, 4); | |
379 | ||
380 | /* create a call */ | |
381 | rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, | |
382 | (unsigned long) call, gfp); | |
00d3b7a4 | 383 | call->key = NULL; |
08e0e7c8 DH |
384 | if (IS_ERR(rxcall)) { |
385 | ret = PTR_ERR(rxcall); | |
386 | goto error_kill_call; | |
387 | } | |
388 | ||
389 | call->rxcall = rxcall; | |
390 | ||
391 | /* send the request */ | |
392 | iov[0].iov_base = call->request; | |
393 | iov[0].iov_len = call->request_size; | |
394 | ||
395 | msg.msg_name = NULL; | |
396 | msg.msg_namelen = 0; | |
2e90b1c4 | 397 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, |
c0371da6 | 398 | call->request_size); |
08e0e7c8 DH |
399 | msg.msg_control = NULL; |
400 | msg.msg_controllen = 0; | |
31143d5d | 401 | msg.msg_flags = (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 DH |
402 | |
403 | /* have to change the state *before* sending the last packet as RxRPC | |
404 | * might give us the reply before it returns from sending the | |
405 | * request */ | |
31143d5d DH |
406 | if (!call->send_pages) |
407 | call->state = AFS_CALL_AWAIT_REPLY; | |
08e0e7c8 DH |
408 | ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size); |
409 | if (ret < 0) | |
410 | goto error_do_abort; | |
411 | ||
31143d5d DH |
412 | if (call->send_pages) { |
413 | ret = afs_send_pages(call, &msg, iov); | |
414 | if (ret < 0) | |
415 | goto error_do_abort; | |
416 | } | |
417 | ||
08e0e7c8 DH |
418 | /* at this point, an async call may no longer exist as it may have |
419 | * already completed */ | |
420 | return wait_mode->wait(call); | |
421 | ||
422 | error_do_abort: | |
423 | rxrpc_kernel_abort_call(rxcall, RX_USER_ABORT); | |
c0173863 AB |
424 | while ((skb = skb_dequeue(&call->rx_queue))) |
425 | afs_free_skb(skb); | |
08e0e7c8 | 426 | error_kill_call: |
6c67c7c3 | 427 | afs_end_call(call); |
08e0e7c8 DH |
428 | _leave(" = %d", ret); |
429 | return ret; | |
430 | } | |
431 | ||
432 | /* | |
dc44b3a0 DH |
433 | * Handles intercepted messages that were arriving in the socket's Rx queue. |
434 | * | |
435 | * Called from the AF_RXRPC call processor in waitqueue process context. For | |
436 | * each call, it is guaranteed this will be called in order of packet to be | |
437 | * delivered. | |
08e0e7c8 DH |
438 | */ |
439 | static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID, | |
440 | struct sk_buff *skb) | |
441 | { | |
442 | struct afs_call *call = (struct afs_call *) user_call_ID; | |
443 | ||
444 | _enter("%p,,%u", call, skb->mark); | |
445 | ||
00d3b7a4 DH |
446 | _debug("ICPT %p{%u} [%d]", |
447 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); | |
448 | ||
08e0e7c8 | 449 | ASSERTCMP(sk, ==, afs_socket->sk); |
00d3b7a4 | 450 | atomic_inc(&afs_outstanding_skbs); |
08e0e7c8 DH |
451 | |
452 | if (!call) { | |
453 | /* its an incoming call for our callback service */ | |
00d3b7a4 | 454 | skb_queue_tail(&afs_incoming_calls, skb); |
0ad53eee | 455 | queue_work(afs_wq, &afs_collect_incoming_call_work); |
08e0e7c8 DH |
456 | } else { |
457 | /* route the messages directly to the appropriate call */ | |
00d3b7a4 | 458 | skb_queue_tail(&call->rx_queue, skb); |
08e0e7c8 DH |
459 | call->wait_mode->rx_wakeup(call); |
460 | } | |
461 | ||
462 | _leave(""); | |
463 | } | |
464 | ||
465 | /* | |
466 | * deliver messages to a call | |
467 | */ | |
468 | static void afs_deliver_to_call(struct afs_call *call) | |
469 | { | |
470 | struct sk_buff *skb; | |
471 | bool last; | |
472 | u32 abort_code; | |
473 | int ret; | |
474 | ||
475 | _enter(""); | |
476 | ||
477 | while ((call->state == AFS_CALL_AWAIT_REPLY || | |
478 | call->state == AFS_CALL_AWAIT_OP_ID || | |
479 | call->state == AFS_CALL_AWAIT_REQUEST || | |
480 | call->state == AFS_CALL_AWAIT_ACK) && | |
481 | (skb = skb_dequeue(&call->rx_queue))) { | |
482 | switch (skb->mark) { | |
483 | case RXRPC_SKB_MARK_DATA: | |
484 | _debug("Rcv DATA"); | |
485 | last = rxrpc_kernel_is_data_last(skb); | |
486 | ret = call->type->deliver(call, skb, last); | |
487 | switch (ret) { | |
488 | case 0: | |
489 | if (last && | |
490 | call->state == AFS_CALL_AWAIT_REPLY) | |
491 | call->state = AFS_CALL_COMPLETE; | |
492 | break; | |
493 | case -ENOTCONN: | |
494 | abort_code = RX_CALL_DEAD; | |
495 | goto do_abort; | |
496 | case -ENOTSUPP: | |
497 | abort_code = RX_INVALID_OPERATION; | |
498 | goto do_abort; | |
499 | default: | |
500 | abort_code = RXGEN_CC_UNMARSHAL; | |
501 | if (call->state != AFS_CALL_AWAIT_REPLY) | |
502 | abort_code = RXGEN_SS_UNMARSHAL; | |
503 | do_abort: | |
504 | rxrpc_kernel_abort_call(call->rxcall, | |
505 | abort_code); | |
506 | call->error = ret; | |
507 | call->state = AFS_CALL_ERROR; | |
508 | break; | |
509 | } | |
00d3b7a4 | 510 | afs_data_delivered(skb); |
08e0e7c8 | 511 | skb = NULL; |
00d3b7a4 | 512 | continue; |
08e0e7c8 DH |
513 | case RXRPC_SKB_MARK_FINAL_ACK: |
514 | _debug("Rcv ACK"); | |
515 | call->state = AFS_CALL_COMPLETE; | |
516 | break; | |
517 | case RXRPC_SKB_MARK_BUSY: | |
518 | _debug("Rcv BUSY"); | |
519 | call->error = -EBUSY; | |
520 | call->state = AFS_CALL_BUSY; | |
521 | break; | |
522 | case RXRPC_SKB_MARK_REMOTE_ABORT: | |
523 | abort_code = rxrpc_kernel_get_abort_code(skb); | |
524 | call->error = call->type->abort_to_error(abort_code); | |
525 | call->state = AFS_CALL_ABORTED; | |
526 | _debug("Rcv ABORT %u -> %d", abort_code, call->error); | |
527 | break; | |
dc44b3a0 DH |
528 | case RXRPC_SKB_MARK_LOCAL_ABORT: |
529 | abort_code = rxrpc_kernel_get_abort_code(skb); | |
530 | call->error = call->type->abort_to_error(abort_code); | |
531 | call->state = AFS_CALL_ABORTED; | |
532 | _debug("Loc ABORT %u -> %d", abort_code, call->error); | |
533 | break; | |
08e0e7c8 DH |
534 | case RXRPC_SKB_MARK_NET_ERROR: |
535 | call->error = -rxrpc_kernel_get_error_number(skb); | |
536 | call->state = AFS_CALL_ERROR; | |
537 | _debug("Rcv NET ERROR %d", call->error); | |
538 | break; | |
539 | case RXRPC_SKB_MARK_LOCAL_ERROR: | |
540 | call->error = -rxrpc_kernel_get_error_number(skb); | |
541 | call->state = AFS_CALL_ERROR; | |
542 | _debug("Rcv LOCAL ERROR %d", call->error); | |
543 | break; | |
544 | default: | |
545 | BUG(); | |
546 | break; | |
547 | } | |
548 | ||
00d3b7a4 | 549 | afs_free_skb(skb); |
08e0e7c8 DH |
550 | } |
551 | ||
552 | /* make sure the queue is empty if the call is done with (we might have | |
553 | * aborted the call early because of an unmarshalling error) */ | |
554 | if (call->state >= AFS_CALL_COMPLETE) { | |
555 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 556 | afs_free_skb(skb); |
6c67c7c3 DH |
557 | if (call->incoming) |
558 | afs_end_call(call); | |
08e0e7c8 DH |
559 | } |
560 | ||
561 | _leave(""); | |
562 | } | |
563 | ||
564 | /* | |
565 | * wait synchronously for a call to complete | |
566 | */ | |
567 | static int afs_wait_for_call_to_complete(struct afs_call *call) | |
568 | { | |
569 | struct sk_buff *skb; | |
570 | int ret; | |
571 | ||
572 | DECLARE_WAITQUEUE(myself, current); | |
573 | ||
574 | _enter(""); | |
575 | ||
576 | add_wait_queue(&call->waitq, &myself); | |
577 | for (;;) { | |
578 | set_current_state(TASK_INTERRUPTIBLE); | |
579 | ||
580 | /* deliver any messages that are in the queue */ | |
581 | if (!skb_queue_empty(&call->rx_queue)) { | |
582 | __set_current_state(TASK_RUNNING); | |
583 | afs_deliver_to_call(call); | |
584 | continue; | |
585 | } | |
586 | ||
587 | ret = call->error; | |
588 | if (call->state >= AFS_CALL_COMPLETE) | |
589 | break; | |
590 | ret = -EINTR; | |
591 | if (signal_pending(current)) | |
592 | break; | |
593 | schedule(); | |
594 | } | |
595 | ||
596 | remove_wait_queue(&call->waitq, &myself); | |
597 | __set_current_state(TASK_RUNNING); | |
598 | ||
599 | /* kill the call */ | |
600 | if (call->state < AFS_CALL_COMPLETE) { | |
601 | _debug("call incomplete"); | |
602 | rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD); | |
603 | while ((skb = skb_dequeue(&call->rx_queue))) | |
00d3b7a4 | 604 | afs_free_skb(skb); |
08e0e7c8 DH |
605 | } |
606 | ||
607 | _debug("call complete"); | |
6c67c7c3 | 608 | afs_end_call(call); |
08e0e7c8 DH |
609 | _leave(" = %d", ret); |
610 | return ret; | |
611 | } | |
612 | ||
613 | /* | |
614 | * wake up a waiting call | |
615 | */ | |
616 | static void afs_wake_up_call_waiter(struct afs_call *call) | |
617 | { | |
618 | wake_up(&call->waitq); | |
619 | } | |
620 | ||
621 | /* | |
622 | * wake up an asynchronous call | |
623 | */ | |
624 | static void afs_wake_up_async_call(struct afs_call *call) | |
625 | { | |
626 | _enter(""); | |
627 | queue_work(afs_async_calls, &call->async_work); | |
628 | } | |
629 | ||
630 | /* | |
631 | * put a call into asynchronous mode | |
632 | * - mustn't touch the call descriptor as the call my have completed by the | |
633 | * time we get here | |
634 | */ | |
635 | static int afs_dont_wait_for_call_to_complete(struct afs_call *call) | |
636 | { | |
637 | _enter(""); | |
638 | return -EINPROGRESS; | |
639 | } | |
640 | ||
641 | /* | |
642 | * delete an asynchronous call | |
643 | */ | |
656f88dd | 644 | static void afs_delete_async_call(struct afs_call *call) |
08e0e7c8 | 645 | { |
08e0e7c8 DH |
646 | _enter(""); |
647 | ||
00d3b7a4 | 648 | afs_free_call(call); |
08e0e7c8 DH |
649 | |
650 | _leave(""); | |
651 | } | |
652 | ||
653 | /* | |
654 | * perform processing on an asynchronous call | |
655 | * - on a multiple-thread workqueue this work item may try to run on several | |
656 | * CPUs at the same time | |
657 | */ | |
656f88dd | 658 | static void afs_process_async_call(struct afs_call *call) |
08e0e7c8 | 659 | { |
08e0e7c8 DH |
660 | _enter(""); |
661 | ||
662 | if (!skb_queue_empty(&call->rx_queue)) | |
663 | afs_deliver_to_call(call); | |
664 | ||
665 | if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) { | |
666 | if (call->wait_mode->async_complete) | |
667 | call->wait_mode->async_complete(call->reply, | |
668 | call->error); | |
669 | call->reply = NULL; | |
670 | ||
671 | /* kill the call */ | |
6cf12869 | 672 | afs_end_call_nofree(call); |
08e0e7c8 DH |
673 | |
674 | /* we can't just delete the call because the work item may be | |
675 | * queued */ | |
05949945 | 676 | call->async_workfn = afs_delete_async_call; |
08e0e7c8 DH |
677 | queue_work(afs_async_calls, &call->async_work); |
678 | } | |
679 | ||
680 | _leave(""); | |
681 | } | |
682 | ||
683 | /* | |
684 | * empty a socket buffer into a flat reply buffer | |
685 | */ | |
686 | void afs_transfer_reply(struct afs_call *call, struct sk_buff *skb) | |
687 | { | |
688 | size_t len = skb->len; | |
689 | ||
690 | if (skb_copy_bits(skb, 0, call->buffer + call->reply_size, len) < 0) | |
691 | BUG(); | |
692 | call->reply_size += len; | |
693 | } | |
694 | ||
695 | /* | |
696 | * accept the backlog of incoming calls | |
697 | */ | |
698 | static void afs_collect_incoming_call(struct work_struct *work) | |
699 | { | |
700 | struct rxrpc_call *rxcall; | |
701 | struct afs_call *call = NULL; | |
702 | struct sk_buff *skb; | |
703 | ||
704 | while ((skb = skb_dequeue(&afs_incoming_calls))) { | |
705 | _debug("new call"); | |
706 | ||
707 | /* don't need the notification */ | |
00d3b7a4 | 708 | afs_free_skb(skb); |
08e0e7c8 DH |
709 | |
710 | if (!call) { | |
711 | call = kzalloc(sizeof(struct afs_call), GFP_KERNEL); | |
712 | if (!call) { | |
713 | rxrpc_kernel_reject_call(afs_socket); | |
714 | return; | |
715 | } | |
716 | ||
05949945 TH |
717 | call->async_workfn = afs_process_async_call; |
718 | INIT_WORK(&call->async_work, afs_async_workfn); | |
08e0e7c8 DH |
719 | call->wait_mode = &afs_async_incoming_call; |
720 | call->type = &afs_RXCMxxxx; | |
721 | init_waitqueue_head(&call->waitq); | |
722 | skb_queue_head_init(&call->rx_queue); | |
723 | call->state = AFS_CALL_AWAIT_OP_ID; | |
00d3b7a4 DH |
724 | |
725 | _debug("CALL %p{%s} [%d]", | |
726 | call, call->type->name, | |
727 | atomic_read(&afs_outstanding_calls)); | |
728 | atomic_inc(&afs_outstanding_calls); | |
08e0e7c8 DH |
729 | } |
730 | ||
731 | rxcall = rxrpc_kernel_accept_call(afs_socket, | |
732 | (unsigned long) call); | |
733 | if (!IS_ERR(rxcall)) { | |
734 | call->rxcall = rxcall; | |
735 | call = NULL; | |
736 | } | |
737 | } | |
738 | ||
00d3b7a4 DH |
739 | if (call) |
740 | afs_free_call(call); | |
08e0e7c8 DH |
741 | } |
742 | ||
743 | /* | |
744 | * grab the operation ID from an incoming cache manager call | |
745 | */ | |
746 | static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb, | |
747 | bool last) | |
748 | { | |
749 | size_t len = skb->len; | |
750 | void *oibuf = (void *) &call->operation_ID; | |
751 | ||
752 | _enter("{%u},{%zu},%d", call->offset, len, last); | |
753 | ||
754 | ASSERTCMP(call->offset, <, 4); | |
755 | ||
756 | /* the operation ID forms the first four bytes of the request data */ | |
757 | len = min_t(size_t, len, 4 - call->offset); | |
758 | if (skb_copy_bits(skb, 0, oibuf + call->offset, len) < 0) | |
759 | BUG(); | |
760 | if (!pskb_pull(skb, len)) | |
761 | BUG(); | |
762 | call->offset += len; | |
763 | ||
764 | if (call->offset < 4) { | |
765 | if (last) { | |
766 | _leave(" = -EBADMSG [op ID short]"); | |
767 | return -EBADMSG; | |
768 | } | |
769 | _leave(" = 0 [incomplete]"); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | call->state = AFS_CALL_AWAIT_REQUEST; | |
774 | ||
775 | /* ask the cache manager to route the call (it'll change the call type | |
776 | * if successful) */ | |
777 | if (!afs_cm_incoming_call(call)) | |
778 | return -ENOTSUPP; | |
779 | ||
780 | /* pass responsibility for the remainer of this message off to the | |
781 | * cache manager op */ | |
782 | return call->type->deliver(call, skb, last); | |
783 | } | |
784 | ||
785 | /* | |
786 | * send an empty reply | |
787 | */ | |
788 | void afs_send_empty_reply(struct afs_call *call) | |
789 | { | |
790 | struct msghdr msg; | |
08e0e7c8 DH |
791 | |
792 | _enter(""); | |
793 | ||
08e0e7c8 DH |
794 | msg.msg_name = NULL; |
795 | msg.msg_namelen = 0; | |
bfd4e956 | 796 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0); |
08e0e7c8 DH |
797 | msg.msg_control = NULL; |
798 | msg.msg_controllen = 0; | |
799 | msg.msg_flags = 0; | |
800 | ||
801 | call->state = AFS_CALL_AWAIT_ACK; | |
802 | switch (rxrpc_kernel_send_data(call->rxcall, &msg, 0)) { | |
803 | case 0: | |
804 | _leave(" [replied]"); | |
805 | return; | |
806 | ||
807 | case -ENOMEM: | |
808 | _debug("oom"); | |
809 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); | |
810 | default: | |
6c67c7c3 | 811 | afs_end_call(call); |
08e0e7c8 DH |
812 | _leave(" [error]"); |
813 | return; | |
814 | } | |
815 | } | |
816 | ||
b908fe6b DH |
817 | /* |
818 | * send a simple reply | |
819 | */ | |
820 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
821 | { | |
822 | struct msghdr msg; | |
2e90b1c4 | 823 | struct kvec iov[1]; |
bd6dc742 | 824 | int n; |
b908fe6b DH |
825 | |
826 | _enter(""); | |
827 | ||
828 | iov[0].iov_base = (void *) buf; | |
829 | iov[0].iov_len = len; | |
830 | msg.msg_name = NULL; | |
831 | msg.msg_namelen = 0; | |
2e90b1c4 | 832 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len); |
b908fe6b DH |
833 | msg.msg_control = NULL; |
834 | msg.msg_controllen = 0; | |
835 | msg.msg_flags = 0; | |
836 | ||
837 | call->state = AFS_CALL_AWAIT_ACK; | |
bd6dc742 DH |
838 | n = rxrpc_kernel_send_data(call->rxcall, &msg, len); |
839 | if (n >= 0) { | |
6c67c7c3 | 840 | /* Success */ |
b908fe6b DH |
841 | _leave(" [replied]"); |
842 | return; | |
bd6dc742 | 843 | } |
6c67c7c3 | 844 | |
bd6dc742 | 845 | if (n == -ENOMEM) { |
b908fe6b DH |
846 | _debug("oom"); |
847 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); | |
b908fe6b | 848 | } |
6c67c7c3 | 849 | afs_end_call(call); |
bd6dc742 | 850 | _leave(" [error]"); |
b908fe6b DH |
851 | } |
852 | ||
08e0e7c8 DH |
853 | /* |
854 | * extract a piece of data from the received data socket buffers | |
855 | */ | |
856 | int afs_extract_data(struct afs_call *call, struct sk_buff *skb, | |
857 | bool last, void *buf, size_t count) | |
858 | { | |
859 | size_t len = skb->len; | |
860 | ||
861 | _enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count); | |
862 | ||
863 | ASSERTCMP(call->offset, <, count); | |
864 | ||
865 | len = min_t(size_t, len, count - call->offset); | |
866 | if (skb_copy_bits(skb, 0, buf + call->offset, len) < 0 || | |
867 | !pskb_pull(skb, len)) | |
868 | BUG(); | |
869 | call->offset += len; | |
870 | ||
871 | if (call->offset < count) { | |
872 | if (last) { | |
b1bdb691 | 873 | _leave(" = -EBADMSG [%d < %zu]", call->offset, count); |
08e0e7c8 DH |
874 | return -EBADMSG; |
875 | } | |
876 | _leave(" = -EAGAIN"); | |
877 | return -EAGAIN; | |
878 | } | |
879 | return 0; | |
880 | } |