David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 1 | /* Maintain an RxRPC server socket to do AFS communications through |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <net/sock.h> |
| 13 | #include <net/af_rxrpc.h> |
| 14 | #include <rxrpc/packet.h> |
| 15 | #include "internal.h" |
| 16 | #include "afs_cm.h" |
| 17 | |
| 18 | static struct socket *afs_socket; /* my RxRPC socket */ |
| 19 | static struct workqueue_struct *afs_async_calls; |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 20 | static atomic_t afs_outstanding_calls; |
| 21 | static atomic_t afs_outstanding_skbs; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 22 | |
| 23 | static void afs_wake_up_call_waiter(struct afs_call *); |
| 24 | static int afs_wait_for_call_to_complete(struct afs_call *); |
| 25 | static void afs_wake_up_async_call(struct afs_call *); |
| 26 | static int afs_dont_wait_for_call_to_complete(struct afs_call *); |
| 27 | static void afs_process_async_call(struct work_struct *); |
| 28 | static void afs_rx_interceptor(struct sock *, unsigned long, struct sk_buff *); |
| 29 | static int afs_deliver_cm_op_id(struct afs_call *, struct sk_buff *, bool); |
| 30 | |
| 31 | /* synchronous call management */ |
| 32 | const struct afs_wait_mode afs_sync_call = { |
| 33 | .rx_wakeup = afs_wake_up_call_waiter, |
| 34 | .wait = afs_wait_for_call_to_complete, |
| 35 | }; |
| 36 | |
| 37 | /* asynchronous call management */ |
| 38 | const struct afs_wait_mode afs_async_call = { |
| 39 | .rx_wakeup = afs_wake_up_async_call, |
| 40 | .wait = afs_dont_wait_for_call_to_complete, |
| 41 | }; |
| 42 | |
| 43 | /* asynchronous incoming call management */ |
| 44 | static const struct afs_wait_mode afs_async_incoming_call = { |
| 45 | .rx_wakeup = afs_wake_up_async_call, |
| 46 | }; |
| 47 | |
| 48 | /* asynchronous incoming call initial processing */ |
| 49 | static const struct afs_call_type afs_RXCMxxxx = { |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 50 | .name = "CB.xxxx", |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 51 | .deliver = afs_deliver_cm_op_id, |
| 52 | .abort_to_error = afs_abort_to_error, |
| 53 | }; |
| 54 | |
| 55 | static void afs_collect_incoming_call(struct work_struct *); |
| 56 | |
| 57 | static struct sk_buff_head afs_incoming_calls; |
| 58 | static DECLARE_WORK(afs_collect_incoming_call_work, afs_collect_incoming_call); |
| 59 | |
| 60 | /* |
| 61 | * open an RxRPC socket and bind it to be a server for callback notifications |
| 62 | * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT |
| 63 | */ |
| 64 | int afs_open_socket(void) |
| 65 | { |
| 66 | struct sockaddr_rxrpc srx; |
| 67 | struct socket *socket; |
| 68 | int ret; |
| 69 | |
| 70 | _enter(""); |
| 71 | |
| 72 | skb_queue_head_init(&afs_incoming_calls); |
| 73 | |
| 74 | afs_async_calls = create_singlethread_workqueue("kafsd"); |
| 75 | if (!afs_async_calls) { |
| 76 | _leave(" = -ENOMEM [wq]"); |
| 77 | return -ENOMEM; |
| 78 | } |
| 79 | |
| 80 | ret = sock_create_kern(AF_RXRPC, SOCK_DGRAM, PF_INET, &socket); |
| 81 | if (ret < 0) { |
| 82 | destroy_workqueue(afs_async_calls); |
| 83 | _leave(" = %d [socket]", ret); |
| 84 | return ret; |
| 85 | } |
| 86 | |
| 87 | socket->sk->sk_allocation = GFP_NOFS; |
| 88 | |
| 89 | /* bind the callback manager's address to make this a server socket */ |
| 90 | srx.srx_family = AF_RXRPC; |
| 91 | srx.srx_service = CM_SERVICE; |
| 92 | srx.transport_type = SOCK_DGRAM; |
| 93 | srx.transport_len = sizeof(srx.transport.sin); |
| 94 | srx.transport.sin.sin_family = AF_INET; |
| 95 | srx.transport.sin.sin_port = htons(AFS_CM_PORT); |
| 96 | memset(&srx.transport.sin.sin_addr, 0, |
| 97 | sizeof(srx.transport.sin.sin_addr)); |
| 98 | |
| 99 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); |
| 100 | if (ret < 0) { |
| 101 | sock_release(socket); |
| 102 | _leave(" = %d [bind]", ret); |
| 103 | return ret; |
| 104 | } |
| 105 | |
| 106 | rxrpc_kernel_intercept_rx_messages(socket, afs_rx_interceptor); |
| 107 | |
| 108 | afs_socket = socket; |
| 109 | _leave(" = 0"); |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * close the RxRPC socket AFS was using |
| 115 | */ |
| 116 | void afs_close_socket(void) |
| 117 | { |
| 118 | _enter(""); |
| 119 | |
| 120 | sock_release(afs_socket); |
| 121 | |
| 122 | _debug("dework"); |
| 123 | destroy_workqueue(afs_async_calls); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 124 | |
| 125 | ASSERTCMP(atomic_read(&afs_outstanding_skbs), ==, 0); |
| 126 | ASSERTCMP(atomic_read(&afs_outstanding_calls), ==, 0); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 127 | _leave(""); |
| 128 | } |
| 129 | |
| 130 | /* |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 131 | * note that the data in a socket buffer is now delivered and that the buffer |
| 132 | * should be freed |
| 133 | */ |
| 134 | static void afs_data_delivered(struct sk_buff *skb) |
| 135 | { |
| 136 | if (!skb) { |
| 137 | _debug("DLVR NULL [%d]", atomic_read(&afs_outstanding_skbs)); |
| 138 | dump_stack(); |
| 139 | } else { |
| 140 | _debug("DLVR %p{%u} [%d]", |
| 141 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); |
| 142 | if (atomic_dec_return(&afs_outstanding_skbs) == -1) |
| 143 | BUG(); |
| 144 | rxrpc_kernel_data_delivered(skb); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * free a socket buffer |
| 150 | */ |
| 151 | static void afs_free_skb(struct sk_buff *skb) |
| 152 | { |
| 153 | if (!skb) { |
| 154 | _debug("FREE NULL [%d]", atomic_read(&afs_outstanding_skbs)); |
| 155 | dump_stack(); |
| 156 | } else { |
| 157 | _debug("FREE %p{%u} [%d]", |
| 158 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); |
| 159 | if (atomic_dec_return(&afs_outstanding_skbs) == -1) |
| 160 | BUG(); |
| 161 | rxrpc_kernel_free_skb(skb); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * free a call |
| 167 | */ |
| 168 | static void afs_free_call(struct afs_call *call) |
| 169 | { |
| 170 | _debug("DONE %p{%s} [%d]", |
| 171 | call, call->type->name, atomic_read(&afs_outstanding_calls)); |
| 172 | if (atomic_dec_return(&afs_outstanding_calls) == -1) |
| 173 | BUG(); |
| 174 | |
| 175 | ASSERTCMP(call->rxcall, ==, NULL); |
| 176 | ASSERT(!work_pending(&call->async_work)); |
| 177 | ASSERT(skb_queue_empty(&call->rx_queue)); |
| 178 | ASSERT(call->type->name != NULL); |
| 179 | |
| 180 | kfree(call->request); |
| 181 | kfree(call); |
| 182 | } |
| 183 | |
| 184 | /* |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 185 | * allocate a call with flat request and reply buffers |
| 186 | */ |
| 187 | struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, |
| 188 | size_t request_size, size_t reply_size) |
| 189 | { |
| 190 | struct afs_call *call; |
| 191 | |
| 192 | call = kzalloc(sizeof(*call), GFP_NOFS); |
| 193 | if (!call) |
| 194 | goto nomem_call; |
| 195 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 196 | _debug("CALL %p{%s} [%d]", |
| 197 | call, type->name, atomic_read(&afs_outstanding_calls)); |
| 198 | atomic_inc(&afs_outstanding_calls); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 199 | |
| 200 | call->type = type; |
| 201 | call->request_size = request_size; |
| 202 | call->reply_max = reply_size; |
| 203 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 204 | if (request_size) { |
| 205 | call->request = kmalloc(request_size, GFP_NOFS); |
| 206 | if (!call->request) |
| 207 | goto nomem_free; |
| 208 | } |
| 209 | |
| 210 | if (reply_size) { |
| 211 | call->buffer = kmalloc(reply_size, GFP_NOFS); |
| 212 | if (!call->buffer) |
| 213 | goto nomem_free; |
| 214 | } |
| 215 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 216 | init_waitqueue_head(&call->waitq); |
| 217 | skb_queue_head_init(&call->rx_queue); |
| 218 | return call; |
| 219 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 220 | nomem_free: |
| 221 | afs_free_call(call); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 222 | nomem_call: |
| 223 | return NULL; |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * clean up a call with flat buffer |
| 228 | */ |
| 229 | void afs_flat_call_destructor(struct afs_call *call) |
| 230 | { |
| 231 | _enter(""); |
| 232 | |
| 233 | kfree(call->request); |
| 234 | call->request = NULL; |
| 235 | kfree(call->buffer); |
| 236 | call->buffer = NULL; |
| 237 | } |
| 238 | |
| 239 | /* |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 240 | * attach the data from a bunch of pages on an inode to a call |
| 241 | */ |
| 242 | int afs_send_pages(struct afs_call *call, struct msghdr *msg, struct kvec *iov) |
| 243 | { |
| 244 | struct page *pages[8]; |
| 245 | unsigned count, n, loop, offset, to; |
| 246 | pgoff_t first = call->first, last = call->last; |
| 247 | int ret; |
| 248 | |
| 249 | _enter(""); |
| 250 | |
| 251 | offset = call->first_offset; |
| 252 | call->first_offset = 0; |
| 253 | |
| 254 | do { |
| 255 | _debug("attach %lx-%lx", first, last); |
| 256 | |
| 257 | count = last - first + 1; |
| 258 | if (count > ARRAY_SIZE(pages)) |
| 259 | count = ARRAY_SIZE(pages); |
| 260 | n = find_get_pages_contig(call->mapping, first, count, pages); |
| 261 | ASSERTCMP(n, ==, count); |
| 262 | |
| 263 | loop = 0; |
| 264 | do { |
| 265 | msg->msg_flags = 0; |
| 266 | to = PAGE_SIZE; |
| 267 | if (first + loop >= last) |
| 268 | to = call->last_to; |
| 269 | else |
| 270 | msg->msg_flags = MSG_MORE; |
| 271 | iov->iov_base = kmap(pages[loop]) + offset; |
| 272 | iov->iov_len = to - offset; |
| 273 | offset = 0; |
| 274 | |
| 275 | _debug("- range %u-%u%s", |
| 276 | offset, to, msg->msg_flags ? " [more]" : ""); |
| 277 | msg->msg_iov = (struct iovec *) iov; |
| 278 | msg->msg_iovlen = 1; |
| 279 | |
| 280 | /* have to change the state *before* sending the last |
| 281 | * packet as RxRPC might give us the reply before it |
| 282 | * returns from sending the request */ |
| 283 | if (first + loop >= last) |
| 284 | call->state = AFS_CALL_AWAIT_REPLY; |
| 285 | ret = rxrpc_kernel_send_data(call->rxcall, msg, |
| 286 | to - offset); |
| 287 | kunmap(pages[loop]); |
| 288 | if (ret < 0) |
| 289 | break; |
| 290 | } while (++loop < count); |
| 291 | first += count; |
| 292 | |
| 293 | for (loop = 0; loop < count; loop++) |
| 294 | put_page(pages[loop]); |
| 295 | if (ret < 0) |
| 296 | break; |
David Howells | 5bbf5d3 | 2007-05-10 03:15:23 -0700 | [diff] [blame] | 297 | } while (first <= last); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 298 | |
| 299 | _leave(" = %d", ret); |
| 300 | return ret; |
| 301 | } |
| 302 | |
| 303 | /* |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 304 | * initiate a call |
| 305 | */ |
| 306 | int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, |
| 307 | const struct afs_wait_mode *wait_mode) |
| 308 | { |
| 309 | struct sockaddr_rxrpc srx; |
| 310 | struct rxrpc_call *rxcall; |
| 311 | struct msghdr msg; |
| 312 | struct kvec iov[1]; |
| 313 | int ret; |
| 314 | |
| 315 | _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); |
| 316 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 317 | ASSERT(call->type != NULL); |
| 318 | ASSERT(call->type->name != NULL); |
| 319 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 320 | _debug("____MAKE %p{%s,%x} [%d]____", |
| 321 | call, call->type->name, key_serial(call->key), |
| 322 | atomic_read(&afs_outstanding_calls)); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 323 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 324 | call->wait_mode = wait_mode; |
| 325 | INIT_WORK(&call->async_work, afs_process_async_call); |
| 326 | |
| 327 | memset(&srx, 0, sizeof(srx)); |
| 328 | srx.srx_family = AF_RXRPC; |
| 329 | srx.srx_service = call->service_id; |
| 330 | srx.transport_type = SOCK_DGRAM; |
| 331 | srx.transport_len = sizeof(srx.transport.sin); |
| 332 | srx.transport.sin.sin_family = AF_INET; |
| 333 | srx.transport.sin.sin_port = call->port; |
| 334 | memcpy(&srx.transport.sin.sin_addr, addr, 4); |
| 335 | |
| 336 | /* create a call */ |
| 337 | rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, |
| 338 | (unsigned long) call, gfp); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 339 | call->key = NULL; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 340 | if (IS_ERR(rxcall)) { |
| 341 | ret = PTR_ERR(rxcall); |
| 342 | goto error_kill_call; |
| 343 | } |
| 344 | |
| 345 | call->rxcall = rxcall; |
| 346 | |
| 347 | /* send the request */ |
| 348 | iov[0].iov_base = call->request; |
| 349 | iov[0].iov_len = call->request_size; |
| 350 | |
| 351 | msg.msg_name = NULL; |
| 352 | msg.msg_namelen = 0; |
| 353 | msg.msg_iov = (struct iovec *) iov; |
| 354 | msg.msg_iovlen = 1; |
| 355 | msg.msg_control = NULL; |
| 356 | msg.msg_controllen = 0; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 357 | msg.msg_flags = (call->send_pages ? MSG_MORE : 0); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 358 | |
| 359 | /* have to change the state *before* sending the last packet as RxRPC |
| 360 | * might give us the reply before it returns from sending the |
| 361 | * request */ |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 362 | if (!call->send_pages) |
| 363 | call->state = AFS_CALL_AWAIT_REPLY; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 364 | ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size); |
| 365 | if (ret < 0) |
| 366 | goto error_do_abort; |
| 367 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 368 | if (call->send_pages) { |
| 369 | ret = afs_send_pages(call, &msg, iov); |
| 370 | if (ret < 0) |
| 371 | goto error_do_abort; |
| 372 | } |
| 373 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 374 | /* at this point, an async call may no longer exist as it may have |
| 375 | * already completed */ |
| 376 | return wait_mode->wait(call); |
| 377 | |
| 378 | error_do_abort: |
| 379 | rxrpc_kernel_abort_call(rxcall, RX_USER_ABORT); |
| 380 | rxrpc_kernel_end_call(rxcall); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 381 | call->rxcall = NULL; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 382 | error_kill_call: |
| 383 | call->type->destructor(call); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 384 | afs_free_call(call); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 385 | _leave(" = %d", ret); |
| 386 | return ret; |
| 387 | } |
| 388 | |
| 389 | /* |
| 390 | * handles intercepted messages that were arriving in the socket's Rx queue |
| 391 | * - called with the socket receive queue lock held to ensure message ordering |
| 392 | * - called with softirqs disabled |
| 393 | */ |
| 394 | static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID, |
| 395 | struct sk_buff *skb) |
| 396 | { |
| 397 | struct afs_call *call = (struct afs_call *) user_call_ID; |
| 398 | |
| 399 | _enter("%p,,%u", call, skb->mark); |
| 400 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 401 | _debug("ICPT %p{%u} [%d]", |
| 402 | skb, skb->mark, atomic_read(&afs_outstanding_skbs)); |
| 403 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 404 | ASSERTCMP(sk, ==, afs_socket->sk); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 405 | atomic_inc(&afs_outstanding_skbs); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 406 | |
| 407 | if (!call) { |
| 408 | /* its an incoming call for our callback service */ |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 409 | skb_queue_tail(&afs_incoming_calls, skb); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 410 | schedule_work(&afs_collect_incoming_call_work); |
| 411 | } else { |
| 412 | /* route the messages directly to the appropriate call */ |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 413 | skb_queue_tail(&call->rx_queue, skb); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 414 | call->wait_mode->rx_wakeup(call); |
| 415 | } |
| 416 | |
| 417 | _leave(""); |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * deliver messages to a call |
| 422 | */ |
| 423 | static void afs_deliver_to_call(struct afs_call *call) |
| 424 | { |
| 425 | struct sk_buff *skb; |
| 426 | bool last; |
| 427 | u32 abort_code; |
| 428 | int ret; |
| 429 | |
| 430 | _enter(""); |
| 431 | |
| 432 | while ((call->state == AFS_CALL_AWAIT_REPLY || |
| 433 | call->state == AFS_CALL_AWAIT_OP_ID || |
| 434 | call->state == AFS_CALL_AWAIT_REQUEST || |
| 435 | call->state == AFS_CALL_AWAIT_ACK) && |
| 436 | (skb = skb_dequeue(&call->rx_queue))) { |
| 437 | switch (skb->mark) { |
| 438 | case RXRPC_SKB_MARK_DATA: |
| 439 | _debug("Rcv DATA"); |
| 440 | last = rxrpc_kernel_is_data_last(skb); |
| 441 | ret = call->type->deliver(call, skb, last); |
| 442 | switch (ret) { |
| 443 | case 0: |
| 444 | if (last && |
| 445 | call->state == AFS_CALL_AWAIT_REPLY) |
| 446 | call->state = AFS_CALL_COMPLETE; |
| 447 | break; |
| 448 | case -ENOTCONN: |
| 449 | abort_code = RX_CALL_DEAD; |
| 450 | goto do_abort; |
| 451 | case -ENOTSUPP: |
| 452 | abort_code = RX_INVALID_OPERATION; |
| 453 | goto do_abort; |
| 454 | default: |
| 455 | abort_code = RXGEN_CC_UNMARSHAL; |
| 456 | if (call->state != AFS_CALL_AWAIT_REPLY) |
| 457 | abort_code = RXGEN_SS_UNMARSHAL; |
| 458 | do_abort: |
| 459 | rxrpc_kernel_abort_call(call->rxcall, |
| 460 | abort_code); |
| 461 | call->error = ret; |
| 462 | call->state = AFS_CALL_ERROR; |
| 463 | break; |
| 464 | } |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 465 | afs_data_delivered(skb); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 466 | skb = NULL; |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 467 | continue; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 468 | case RXRPC_SKB_MARK_FINAL_ACK: |
| 469 | _debug("Rcv ACK"); |
| 470 | call->state = AFS_CALL_COMPLETE; |
| 471 | break; |
| 472 | case RXRPC_SKB_MARK_BUSY: |
| 473 | _debug("Rcv BUSY"); |
| 474 | call->error = -EBUSY; |
| 475 | call->state = AFS_CALL_BUSY; |
| 476 | break; |
| 477 | case RXRPC_SKB_MARK_REMOTE_ABORT: |
| 478 | abort_code = rxrpc_kernel_get_abort_code(skb); |
| 479 | call->error = call->type->abort_to_error(abort_code); |
| 480 | call->state = AFS_CALL_ABORTED; |
| 481 | _debug("Rcv ABORT %u -> %d", abort_code, call->error); |
| 482 | break; |
| 483 | case RXRPC_SKB_MARK_NET_ERROR: |
| 484 | call->error = -rxrpc_kernel_get_error_number(skb); |
| 485 | call->state = AFS_CALL_ERROR; |
| 486 | _debug("Rcv NET ERROR %d", call->error); |
| 487 | break; |
| 488 | case RXRPC_SKB_MARK_LOCAL_ERROR: |
| 489 | call->error = -rxrpc_kernel_get_error_number(skb); |
| 490 | call->state = AFS_CALL_ERROR; |
| 491 | _debug("Rcv LOCAL ERROR %d", call->error); |
| 492 | break; |
| 493 | default: |
| 494 | BUG(); |
| 495 | break; |
| 496 | } |
| 497 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 498 | afs_free_skb(skb); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | /* make sure the queue is empty if the call is done with (we might have |
| 502 | * aborted the call early because of an unmarshalling error) */ |
| 503 | if (call->state >= AFS_CALL_COMPLETE) { |
| 504 | while ((skb = skb_dequeue(&call->rx_queue))) |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 505 | afs_free_skb(skb); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 506 | if (call->incoming) { |
| 507 | rxrpc_kernel_end_call(call->rxcall); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 508 | call->rxcall = NULL; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 509 | call->type->destructor(call); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 510 | afs_free_call(call); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 511 | } |
| 512 | } |
| 513 | |
| 514 | _leave(""); |
| 515 | } |
| 516 | |
| 517 | /* |
| 518 | * wait synchronously for a call to complete |
| 519 | */ |
| 520 | static int afs_wait_for_call_to_complete(struct afs_call *call) |
| 521 | { |
| 522 | struct sk_buff *skb; |
| 523 | int ret; |
| 524 | |
| 525 | DECLARE_WAITQUEUE(myself, current); |
| 526 | |
| 527 | _enter(""); |
| 528 | |
| 529 | add_wait_queue(&call->waitq, &myself); |
| 530 | for (;;) { |
| 531 | set_current_state(TASK_INTERRUPTIBLE); |
| 532 | |
| 533 | /* deliver any messages that are in the queue */ |
| 534 | if (!skb_queue_empty(&call->rx_queue)) { |
| 535 | __set_current_state(TASK_RUNNING); |
| 536 | afs_deliver_to_call(call); |
| 537 | continue; |
| 538 | } |
| 539 | |
| 540 | ret = call->error; |
| 541 | if (call->state >= AFS_CALL_COMPLETE) |
| 542 | break; |
| 543 | ret = -EINTR; |
| 544 | if (signal_pending(current)) |
| 545 | break; |
| 546 | schedule(); |
| 547 | } |
| 548 | |
| 549 | remove_wait_queue(&call->waitq, &myself); |
| 550 | __set_current_state(TASK_RUNNING); |
| 551 | |
| 552 | /* kill the call */ |
| 553 | if (call->state < AFS_CALL_COMPLETE) { |
| 554 | _debug("call incomplete"); |
| 555 | rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD); |
| 556 | while ((skb = skb_dequeue(&call->rx_queue))) |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 557 | afs_free_skb(skb); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | _debug("call complete"); |
| 561 | rxrpc_kernel_end_call(call->rxcall); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 562 | call->rxcall = NULL; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 563 | call->type->destructor(call); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 564 | afs_free_call(call); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 565 | _leave(" = %d", ret); |
| 566 | return ret; |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * wake up a waiting call |
| 571 | */ |
| 572 | static void afs_wake_up_call_waiter(struct afs_call *call) |
| 573 | { |
| 574 | wake_up(&call->waitq); |
| 575 | } |
| 576 | |
| 577 | /* |
| 578 | * wake up an asynchronous call |
| 579 | */ |
| 580 | static void afs_wake_up_async_call(struct afs_call *call) |
| 581 | { |
| 582 | _enter(""); |
| 583 | queue_work(afs_async_calls, &call->async_work); |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * put a call into asynchronous mode |
| 588 | * - mustn't touch the call descriptor as the call my have completed by the |
| 589 | * time we get here |
| 590 | */ |
| 591 | static int afs_dont_wait_for_call_to_complete(struct afs_call *call) |
| 592 | { |
| 593 | _enter(""); |
| 594 | return -EINPROGRESS; |
| 595 | } |
| 596 | |
| 597 | /* |
| 598 | * delete an asynchronous call |
| 599 | */ |
| 600 | static void afs_delete_async_call(struct work_struct *work) |
| 601 | { |
| 602 | struct afs_call *call = |
| 603 | container_of(work, struct afs_call, async_work); |
| 604 | |
| 605 | _enter(""); |
| 606 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 607 | afs_free_call(call); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 608 | |
| 609 | _leave(""); |
| 610 | } |
| 611 | |
| 612 | /* |
| 613 | * perform processing on an asynchronous call |
| 614 | * - on a multiple-thread workqueue this work item may try to run on several |
| 615 | * CPUs at the same time |
| 616 | */ |
| 617 | static void afs_process_async_call(struct work_struct *work) |
| 618 | { |
| 619 | struct afs_call *call = |
| 620 | container_of(work, struct afs_call, async_work); |
| 621 | |
| 622 | _enter(""); |
| 623 | |
| 624 | if (!skb_queue_empty(&call->rx_queue)) |
| 625 | afs_deliver_to_call(call); |
| 626 | |
| 627 | if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) { |
| 628 | if (call->wait_mode->async_complete) |
| 629 | call->wait_mode->async_complete(call->reply, |
| 630 | call->error); |
| 631 | call->reply = NULL; |
| 632 | |
| 633 | /* kill the call */ |
| 634 | rxrpc_kernel_end_call(call->rxcall); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 635 | call->rxcall = NULL; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 636 | if (call->type->destructor) |
| 637 | call->type->destructor(call); |
| 638 | |
| 639 | /* we can't just delete the call because the work item may be |
| 640 | * queued */ |
| 641 | PREPARE_WORK(&call->async_work, afs_delete_async_call); |
| 642 | queue_work(afs_async_calls, &call->async_work); |
| 643 | } |
| 644 | |
| 645 | _leave(""); |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * empty a socket buffer into a flat reply buffer |
| 650 | */ |
| 651 | void afs_transfer_reply(struct afs_call *call, struct sk_buff *skb) |
| 652 | { |
| 653 | size_t len = skb->len; |
| 654 | |
| 655 | if (skb_copy_bits(skb, 0, call->buffer + call->reply_size, len) < 0) |
| 656 | BUG(); |
| 657 | call->reply_size += len; |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * accept the backlog of incoming calls |
| 662 | */ |
| 663 | static void afs_collect_incoming_call(struct work_struct *work) |
| 664 | { |
| 665 | struct rxrpc_call *rxcall; |
| 666 | struct afs_call *call = NULL; |
| 667 | struct sk_buff *skb; |
| 668 | |
| 669 | while ((skb = skb_dequeue(&afs_incoming_calls))) { |
| 670 | _debug("new call"); |
| 671 | |
| 672 | /* don't need the notification */ |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 673 | afs_free_skb(skb); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 674 | |
| 675 | if (!call) { |
| 676 | call = kzalloc(sizeof(struct afs_call), GFP_KERNEL); |
| 677 | if (!call) { |
| 678 | rxrpc_kernel_reject_call(afs_socket); |
| 679 | return; |
| 680 | } |
| 681 | |
| 682 | INIT_WORK(&call->async_work, afs_process_async_call); |
| 683 | call->wait_mode = &afs_async_incoming_call; |
| 684 | call->type = &afs_RXCMxxxx; |
| 685 | init_waitqueue_head(&call->waitq); |
| 686 | skb_queue_head_init(&call->rx_queue); |
| 687 | call->state = AFS_CALL_AWAIT_OP_ID; |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 688 | |
| 689 | _debug("CALL %p{%s} [%d]", |
| 690 | call, call->type->name, |
| 691 | atomic_read(&afs_outstanding_calls)); |
| 692 | atomic_inc(&afs_outstanding_calls); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 693 | } |
| 694 | |
| 695 | rxcall = rxrpc_kernel_accept_call(afs_socket, |
| 696 | (unsigned long) call); |
| 697 | if (!IS_ERR(rxcall)) { |
| 698 | call->rxcall = rxcall; |
| 699 | call = NULL; |
| 700 | } |
| 701 | } |
| 702 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 703 | if (call) |
| 704 | afs_free_call(call); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 705 | } |
| 706 | |
| 707 | /* |
| 708 | * grab the operation ID from an incoming cache manager call |
| 709 | */ |
| 710 | static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb, |
| 711 | bool last) |
| 712 | { |
| 713 | size_t len = skb->len; |
| 714 | void *oibuf = (void *) &call->operation_ID; |
| 715 | |
| 716 | _enter("{%u},{%zu},%d", call->offset, len, last); |
| 717 | |
| 718 | ASSERTCMP(call->offset, <, 4); |
| 719 | |
| 720 | /* the operation ID forms the first four bytes of the request data */ |
| 721 | len = min_t(size_t, len, 4 - call->offset); |
| 722 | if (skb_copy_bits(skb, 0, oibuf + call->offset, len) < 0) |
| 723 | BUG(); |
| 724 | if (!pskb_pull(skb, len)) |
| 725 | BUG(); |
| 726 | call->offset += len; |
| 727 | |
| 728 | if (call->offset < 4) { |
| 729 | if (last) { |
| 730 | _leave(" = -EBADMSG [op ID short]"); |
| 731 | return -EBADMSG; |
| 732 | } |
| 733 | _leave(" = 0 [incomplete]"); |
| 734 | return 0; |
| 735 | } |
| 736 | |
| 737 | call->state = AFS_CALL_AWAIT_REQUEST; |
| 738 | |
| 739 | /* ask the cache manager to route the call (it'll change the call type |
| 740 | * if successful) */ |
| 741 | if (!afs_cm_incoming_call(call)) |
| 742 | return -ENOTSUPP; |
| 743 | |
| 744 | /* pass responsibility for the remainer of this message off to the |
| 745 | * cache manager op */ |
| 746 | return call->type->deliver(call, skb, last); |
| 747 | } |
| 748 | |
| 749 | /* |
| 750 | * send an empty reply |
| 751 | */ |
| 752 | void afs_send_empty_reply(struct afs_call *call) |
| 753 | { |
| 754 | struct msghdr msg; |
| 755 | struct iovec iov[1]; |
| 756 | |
| 757 | _enter(""); |
| 758 | |
| 759 | iov[0].iov_base = NULL; |
| 760 | iov[0].iov_len = 0; |
| 761 | msg.msg_name = NULL; |
| 762 | msg.msg_namelen = 0; |
| 763 | msg.msg_iov = iov; |
| 764 | msg.msg_iovlen = 0; |
| 765 | msg.msg_control = NULL; |
| 766 | msg.msg_controllen = 0; |
| 767 | msg.msg_flags = 0; |
| 768 | |
| 769 | call->state = AFS_CALL_AWAIT_ACK; |
| 770 | switch (rxrpc_kernel_send_data(call->rxcall, &msg, 0)) { |
| 771 | case 0: |
| 772 | _leave(" [replied]"); |
| 773 | return; |
| 774 | |
| 775 | case -ENOMEM: |
| 776 | _debug("oom"); |
| 777 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); |
| 778 | default: |
| 779 | rxrpc_kernel_end_call(call->rxcall); |
| 780 | call->rxcall = NULL; |
| 781 | call->type->destructor(call); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 782 | afs_free_call(call); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 783 | _leave(" [error]"); |
| 784 | return; |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | /* |
David Howells | b908fe6 | 2007-04-26 15:58:17 -0700 | [diff] [blame] | 789 | * send a simple reply |
| 790 | */ |
| 791 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) |
| 792 | { |
| 793 | struct msghdr msg; |
| 794 | struct iovec iov[1]; |
| 795 | |
| 796 | _enter(""); |
| 797 | |
| 798 | iov[0].iov_base = (void *) buf; |
| 799 | iov[0].iov_len = len; |
| 800 | msg.msg_name = NULL; |
| 801 | msg.msg_namelen = 0; |
| 802 | msg.msg_iov = iov; |
| 803 | msg.msg_iovlen = 1; |
| 804 | msg.msg_control = NULL; |
| 805 | msg.msg_controllen = 0; |
| 806 | msg.msg_flags = 0; |
| 807 | |
| 808 | call->state = AFS_CALL_AWAIT_ACK; |
| 809 | switch (rxrpc_kernel_send_data(call->rxcall, &msg, len)) { |
| 810 | case 0: |
| 811 | _leave(" [replied]"); |
| 812 | return; |
| 813 | |
| 814 | case -ENOMEM: |
| 815 | _debug("oom"); |
| 816 | rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT); |
| 817 | default: |
| 818 | rxrpc_kernel_end_call(call->rxcall); |
| 819 | call->rxcall = NULL; |
| 820 | call->type->destructor(call); |
| 821 | afs_free_call(call); |
| 822 | _leave(" [error]"); |
| 823 | return; |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | /* |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 828 | * extract a piece of data from the received data socket buffers |
| 829 | */ |
| 830 | int afs_extract_data(struct afs_call *call, struct sk_buff *skb, |
| 831 | bool last, void *buf, size_t count) |
| 832 | { |
| 833 | size_t len = skb->len; |
| 834 | |
| 835 | _enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count); |
| 836 | |
| 837 | ASSERTCMP(call->offset, <, count); |
| 838 | |
| 839 | len = min_t(size_t, len, count - call->offset); |
| 840 | if (skb_copy_bits(skb, 0, buf + call->offset, len) < 0 || |
| 841 | !pskb_pull(skb, len)) |
| 842 | BUG(); |
| 843 | call->offset += len; |
| 844 | |
| 845 | if (call->offset < count) { |
| 846 | if (last) { |
David Howells | b1bdb69 | 2007-04-27 15:28:45 -0700 | [diff] [blame] | 847 | _leave(" = -EBADMSG [%d < %zu]", call->offset, count); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 848 | return -EBADMSG; |
| 849 | } |
| 850 | _leave(" = -EAGAIN"); |
| 851 | return -EAGAIN; |
| 852 | } |
| 853 | return 0; |
| 854 | } |