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1 | /* RxRPC packet transmission |
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 <linux/net.h> |
13 | #include <linux/gfp.h> |
14 | #include <linux/skbuff.h> |
15 | #include <linux/circ_buf.h> |
16 | #include <linux/export.h> |
17 | #include <net/sock.h> |
18 | #include <net/af_rxrpc.h> |
19 | #include "ar-internal.h" |
20 | |
21 | /* |
22 | * Time till packet resend (in jiffies). |
23 | */ |
24 | unsigned rxrpc_resend_timeout = 4 * HZ; |
25 | |
26 | static int rxrpc_send_data(struct kiocb *iocb, |
27 | struct rxrpc_sock *rx, |
28 | struct rxrpc_call *call, |
29 | struct msghdr *msg, size_t len); |
30 | |
31 | /* |
32 | * extract control messages from the sendmsg() control buffer |
33 | */ |
34 | static int rxrpc_sendmsg_cmsg(struct rxrpc_sock *rx, struct msghdr *msg, |
35 | unsigned long *user_call_ID, |
36 | enum rxrpc_command *command, |
37 | u32 *abort_code, |
38 | bool server) |
39 | { |
40 | struct cmsghdr *cmsg; |
41 | int len; |
42 | |
43 | *command = RXRPC_CMD_SEND_DATA; |
44 | |
45 | if (msg->msg_controllen == 0) |
46 | return -EINVAL; |
47 | |
48 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
49 | if (!CMSG_OK(msg, cmsg)) |
50 | return -EINVAL; |
51 | |
52 | len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); |
53 | _debug("CMSG %d, %d, %d", |
54 | cmsg->cmsg_level, cmsg->cmsg_type, len); |
55 | |
56 | if (cmsg->cmsg_level != SOL_RXRPC) |
57 | continue; |
58 | |
59 | switch (cmsg->cmsg_type) { |
60 | case RXRPC_USER_CALL_ID: |
61 | if (msg->msg_flags & MSG_CMSG_COMPAT) { |
62 | if (len != sizeof(u32)) |
63 | return -EINVAL; |
64 | *user_call_ID = *(u32 *) CMSG_DATA(cmsg); |
65 | } else { |
66 | if (len != sizeof(unsigned long)) |
67 | return -EINVAL; |
68 | *user_call_ID = *(unsigned long *) |
69 | CMSG_DATA(cmsg); |
70 | } |
71 | _debug("User Call ID %lx", *user_call_ID); |
72 | break; |
73 | |
74 | case RXRPC_ABORT: |
75 | if (*command != RXRPC_CMD_SEND_DATA) |
76 | return -EINVAL; |
77 | *command = RXRPC_CMD_SEND_ABORT; |
78 | if (len != sizeof(*abort_code)) |
79 | return -EINVAL; |
80 | *abort_code = *(unsigned int *) CMSG_DATA(cmsg); |
81 | _debug("Abort %x", *abort_code); |
82 | if (*abort_code == 0) |
83 | return -EINVAL; |
84 | break; |
85 | |
86 | case RXRPC_ACCEPT: |
87 | if (*command != RXRPC_CMD_SEND_DATA) |
88 | return -EINVAL; |
89 | *command = RXRPC_CMD_ACCEPT; |
90 | if (len != 0) |
91 | return -EINVAL; |
92 | if (!server) |
93 | return -EISCONN; |
94 | break; |
95 | |
96 | default: |
97 | return -EINVAL; |
98 | } |
99 | } |
100 | |
101 | _leave(" = 0"); |
102 | return 0; |
103 | } |
104 | |
105 | /* |
106 | * abort a call, sending an ABORT packet to the peer |
107 | */ |
108 | static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code) |
109 | { |
110 | write_lock_bh(&call->state_lock); |
111 | |
112 | if (call->state <= RXRPC_CALL_COMPLETE) { |
113 | call->state = RXRPC_CALL_LOCALLY_ABORTED; |
114 | call->abort_code = abort_code; |
115 | set_bit(RXRPC_CALL_ABORT, &call->events); |
116 | del_timer_sync(&call->resend_timer); |
117 | del_timer_sync(&call->ack_timer); |
118 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); |
119 | clear_bit(RXRPC_CALL_ACK, &call->events); |
120 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
121 | rxrpc_queue_call(call); |
122 | } |
123 | |
124 | write_unlock_bh(&call->state_lock); |
125 | } |
126 | |
127 | /* |
128 | * send a message forming part of a client call through an RxRPC socket |
129 | * - caller holds the socket locked |
130 | * - the socket may be either a client socket or a server socket |
131 | */ |
132 | int rxrpc_client_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx, |
133 | struct rxrpc_transport *trans, struct msghdr *msg, |
134 | size_t len) |
135 | { |
136 | struct rxrpc_conn_bundle *bundle; |
137 | enum rxrpc_command cmd; |
138 | struct rxrpc_call *call; |
139 | unsigned long user_call_ID = 0; |
140 | struct key *key; |
141 | __be16 service_id; |
142 | u32 abort_code = 0; |
143 | int ret; |
144 | |
145 | _enter(""); |
146 | |
147 | ASSERT(trans != NULL); |
148 | |
149 | ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code, |
150 | false); |
151 | if (ret < 0) |
152 | return ret; |
153 | |
154 | bundle = NULL; |
155 | if (trans) { |
156 | service_id = rx->service_id; |
157 | if (msg->msg_name) { |
158 | DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, |
159 | msg->msg_name); |
160 | service_id = htons(srx->srx_service); |
161 | } |
162 | key = rx->key; |
163 | if (key && !rx->key->payload.data) |
164 | key = NULL; |
165 | bundle = rxrpc_get_bundle(rx, trans, key, service_id, |
166 | GFP_KERNEL); |
167 | if (IS_ERR(bundle)) |
168 | return PTR_ERR(bundle); |
169 | } |
170 | |
171 | call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, |
172 | abort_code == 0, GFP_KERNEL); |
173 | if (trans) |
174 | rxrpc_put_bundle(trans, bundle); |
175 | if (IS_ERR(call)) { |
176 | _leave(" = %ld", PTR_ERR(call)); |
177 | return PTR_ERR(call); |
178 | } |
179 | |
180 | _debug("CALL %d USR %lx ST %d on CONN %p", |
181 | call->debug_id, call->user_call_ID, call->state, call->conn); |
182 | |
183 | if (call->state >= RXRPC_CALL_COMPLETE) { |
184 | /* it's too late for this call */ |
185 | ret = -ESHUTDOWN; |
186 | } else if (cmd == RXRPC_CMD_SEND_ABORT) { |
187 | rxrpc_send_abort(call, abort_code); |
188 | } else if (cmd != RXRPC_CMD_SEND_DATA) { |
189 | ret = -EINVAL; |
190 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) { |
191 | /* request phase complete for this client call */ |
192 | ret = -EPROTO; |
193 | } else { |
194 | ret = rxrpc_send_data(iocb, rx, call, msg, len); |
195 | } |
196 | |
197 | rxrpc_put_call(call); |
198 | _leave(" = %d", ret); |
199 | return ret; |
200 | } |
201 | |
202 | /** |
203 | * rxrpc_kernel_send_data - Allow a kernel service to send data on a call |
204 | * @call: The call to send data through |
205 | * @msg: The data to send |
206 | * @len: The amount of data to send |
207 | * |
208 | * Allow a kernel service to send data on a call. The call must be in an state |
209 | * appropriate to sending data. No control data should be supplied in @msg, |
210 | * nor should an address be supplied. MSG_MORE should be flagged if there's |
211 | * more data to come, otherwise this data will end the transmission phase. |
212 | */ |
213 | int rxrpc_kernel_send_data(struct rxrpc_call *call, struct msghdr *msg, |
214 | size_t len) |
215 | { |
216 | int ret; |
217 | |
218 | _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); |
219 | |
220 | ASSERTCMP(msg->msg_name, ==, NULL); |
221 | ASSERTCMP(msg->msg_control, ==, NULL); |
222 | |
223 | lock_sock(&call->socket->sk); |
224 | |
225 | _debug("CALL %d USR %lx ST %d on CONN %p", |
226 | call->debug_id, call->user_call_ID, call->state, call->conn); |
227 | |
228 | if (call->state >= RXRPC_CALL_COMPLETE) { |
229 | ret = -ESHUTDOWN; /* it's too late for this call */ |
230 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && |
231 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && |
232 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { |
233 | ret = -EPROTO; /* request phase complete for this client call */ |
234 | } else { |
235 | mm_segment_t oldfs = get_fs(); |
236 | set_fs(KERNEL_DS); |
237 | ret = rxrpc_send_data(NULL, call->socket, call, msg, len); |
238 | set_fs(oldfs); |
239 | } |
240 | |
241 | release_sock(&call->socket->sk); |
242 | _leave(" = %d", ret); |
243 | return ret; |
244 | } |
245 | |
246 | EXPORT_SYMBOL(rxrpc_kernel_send_data); |
247 | |
248 | /** |
249 | * rxrpc_kernel_abort_call - Allow a kernel service to abort a call |
250 | * @call: The call to be aborted |
251 | * @abort_code: The abort code to stick into the ABORT packet |
252 | * |
253 | * Allow a kernel service to abort a call, if it's still in an abortable state. |
254 | */ |
255 | void rxrpc_kernel_abort_call(struct rxrpc_call *call, u32 abort_code) |
256 | { |
257 | _enter("{%d},%d", call->debug_id, abort_code); |
258 | |
259 | lock_sock(&call->socket->sk); |
260 | |
261 | _debug("CALL %d USR %lx ST %d on CONN %p", |
262 | call->debug_id, call->user_call_ID, call->state, call->conn); |
263 | |
264 | if (call->state < RXRPC_CALL_COMPLETE) |
265 | rxrpc_send_abort(call, abort_code); |
266 | |
267 | release_sock(&call->socket->sk); |
268 | _leave(""); |
269 | } |
270 | |
271 | EXPORT_SYMBOL(rxrpc_kernel_abort_call); |
272 | |
273 | /* |
274 | * send a message through a server socket |
275 | * - caller holds the socket locked |
276 | */ |
277 | int rxrpc_server_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx, |
278 | struct msghdr *msg, size_t len) |
279 | { |
280 | enum rxrpc_command cmd; |
281 | struct rxrpc_call *call; |
282 | unsigned long user_call_ID = 0; |
283 | u32 abort_code = 0; |
284 | int ret; |
285 | |
286 | _enter(""); |
287 | |
288 | ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code, |
289 | true); |
290 | if (ret < 0) |
291 | return ret; |
292 | |
293 | if (cmd == RXRPC_CMD_ACCEPT) { |
294 | call = rxrpc_accept_call(rx, user_call_ID); |
295 | if (IS_ERR(call)) |
296 | return PTR_ERR(call); |
297 | rxrpc_put_call(call); |
298 | return 0; |
299 | } |
300 | |
301 | call = rxrpc_find_server_call(rx, user_call_ID); |
302 | if (!call) |
303 | return -EBADSLT; |
304 | if (call->state >= RXRPC_CALL_COMPLETE) { |
305 | ret = -ESHUTDOWN; |
306 | goto out; |
307 | } |
308 | |
309 | switch (cmd) { |
310 | case RXRPC_CMD_SEND_DATA: |
311 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && |
312 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && |
313 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { |
314 | /* Tx phase not yet begun for this call */ |
315 | ret = -EPROTO; |
316 | break; |
317 | } |
318 | |
319 | ret = rxrpc_send_data(iocb, rx, call, msg, len); |
320 | break; |
321 | |
322 | case RXRPC_CMD_SEND_ABORT: |
323 | rxrpc_send_abort(call, abort_code); |
324 | break; |
325 | default: |
326 | BUG(); |
327 | } |
328 | |
329 | out: |
330 | rxrpc_put_call(call); |
331 | _leave(" = %d", ret); |
332 | return ret; |
333 | } |
334 | |
335 | /* |
336 | * send a packet through the transport endpoint |
337 | */ |
338 | int rxrpc_send_packet(struct rxrpc_transport *trans, struct sk_buff *skb) |
339 | { |
340 | struct kvec iov[1]; |
341 | struct msghdr msg; |
342 | int ret, opt; |
343 | |
344 | _enter(",{%d}", skb->len); |
345 | |
346 | iov[0].iov_base = skb->head; |
347 | iov[0].iov_len = skb->len; |
348 | |
349 | msg.msg_name = &trans->peer->srx.transport.sin; |
350 | msg.msg_namelen = sizeof(trans->peer->srx.transport.sin); |
351 | msg.msg_control = NULL; |
352 | msg.msg_controllen = 0; |
353 | msg.msg_flags = 0; |
354 | |
355 | /* send the packet with the don't fragment bit set if we currently |
356 | * think it's small enough */ |
357 | if (skb->len - sizeof(struct rxrpc_header) < trans->peer->maxdata) { |
358 | down_read(&trans->local->defrag_sem); |
359 | /* send the packet by UDP |
360 | * - returns -EMSGSIZE if UDP would have to fragment the packet |
361 | * to go out of the interface |
362 | * - in which case, we'll have processed the ICMP error |
363 | * message and update the peer record |
364 | */ |
365 | ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1, |
366 | iov[0].iov_len); |
367 | |
368 | up_read(&trans->local->defrag_sem); |
369 | if (ret == -EMSGSIZE) |
370 | goto send_fragmentable; |
371 | |
372 | _leave(" = %d [%u]", ret, trans->peer->maxdata); |
373 | return ret; |
374 | } |
375 | |
376 | send_fragmentable: |
377 | /* attempt to send this message with fragmentation enabled */ |
378 | _debug("send fragment"); |
379 | |
380 | down_write(&trans->local->defrag_sem); |
381 | opt = IP_PMTUDISC_DONT; |
382 | ret = kernel_setsockopt(trans->local->socket, SOL_IP, IP_MTU_DISCOVER, |
383 | (char *) &opt, sizeof(opt)); |
384 | if (ret == 0) { |
385 | ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1, |
386 | iov[0].iov_len); |
387 | |
388 | opt = IP_PMTUDISC_DO; |
389 | kernel_setsockopt(trans->local->socket, SOL_IP, |
390 | IP_MTU_DISCOVER, (char *) &opt, sizeof(opt)); |
391 | } |
392 | |
393 | up_write(&trans->local->defrag_sem); |
394 | _leave(" = %d [frag %u]", ret, trans->peer->maxdata); |
395 | return ret; |
396 | } |
397 | |
398 | /* |
399 | * wait for space to appear in the transmit/ACK window |
400 | * - caller holds the socket locked |
401 | */ |
402 | static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, |
403 | struct rxrpc_call *call, |
404 | long *timeo) |
405 | { |
406 | DECLARE_WAITQUEUE(myself, current); |
407 | int ret; |
408 | |
409 | _enter(",{%d},%ld", |
410 | CIRC_SPACE(call->acks_head, call->acks_tail, call->acks_winsz), |
411 | *timeo); |
412 | |
413 | add_wait_queue(&call->tx_waitq, &myself); |
414 | |
415 | for (;;) { |
416 | set_current_state(TASK_INTERRUPTIBLE); |
417 | ret = 0; |
418 | if (CIRC_SPACE(call->acks_head, call->acks_tail, |
419 | call->acks_winsz) > 0) |
420 | break; |
421 | if (signal_pending(current)) { |
422 | ret = sock_intr_errno(*timeo); |
423 | break; |
424 | } |
425 | |
426 | release_sock(&rx->sk); |
427 | *timeo = schedule_timeout(*timeo); |
428 | lock_sock(&rx->sk); |
429 | } |
430 | |
431 | remove_wait_queue(&call->tx_waitq, &myself); |
432 | set_current_state(TASK_RUNNING); |
433 | _leave(" = %d", ret); |
434 | return ret; |
435 | } |
436 | |
437 | /* |
438 | * attempt to schedule an instant Tx resend |
439 | */ |
440 | static inline void rxrpc_instant_resend(struct rxrpc_call *call) |
441 | { |
442 | read_lock_bh(&call->state_lock); |
443 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { |
444 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
445 | if (call->state < RXRPC_CALL_COMPLETE && |
446 | !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) |
447 | rxrpc_queue_call(call); |
448 | } |
449 | read_unlock_bh(&call->state_lock); |
450 | } |
451 | |
452 | /* |
453 | * queue a packet for transmission, set the resend timer and attempt |
454 | * to send the packet immediately |
455 | */ |
456 | static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb, |
457 | bool last) |
458 | { |
459 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
460 | int ret; |
461 | |
462 | _net("queue skb %p [%d]", skb, call->acks_head); |
463 | |
464 | ASSERT(call->acks_window != NULL); |
465 | call->acks_window[call->acks_head] = (unsigned long) skb; |
466 | smp_wmb(); |
467 | call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1); |
468 | |
469 | if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { |
470 | _debug("________awaiting reply/ACK__________"); |
471 | write_lock_bh(&call->state_lock); |
472 | switch (call->state) { |
473 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
474 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; |
475 | break; |
476 | case RXRPC_CALL_SERVER_ACK_REQUEST: |
477 | call->state = RXRPC_CALL_SERVER_SEND_REPLY; |
478 | if (!last) |
479 | break; |
480 | case RXRPC_CALL_SERVER_SEND_REPLY: |
481 | call->state = RXRPC_CALL_SERVER_AWAIT_ACK; |
482 | break; |
483 | default: |
484 | break; |
485 | } |
486 | write_unlock_bh(&call->state_lock); |
487 | } |
488 | |
489 | _proto("Tx DATA %%%u { #%u }", |
490 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); |
491 | |
492 | sp->need_resend = false; |
493 | sp->resend_at = jiffies + rxrpc_resend_timeout; |
494 | if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) { |
495 | _debug("run timer"); |
496 | call->resend_timer.expires = sp->resend_at; |
497 | add_timer(&call->resend_timer); |
498 | } |
499 | |
500 | /* attempt to cancel the rx-ACK timer, deferring reply transmission if |
501 | * we're ACK'ing the request phase of an incoming call */ |
502 | ret = -EAGAIN; |
503 | if (try_to_del_timer_sync(&call->ack_timer) >= 0) { |
504 | /* the packet may be freed by rxrpc_process_call() before this |
505 | * returns */ |
506 | ret = rxrpc_send_packet(call->conn->trans, skb); |
507 | _net("sent skb %p", skb); |
508 | } else { |
509 | _debug("failed to delete ACK timer"); |
510 | } |
511 | |
512 | if (ret < 0) { |
513 | _debug("need instant resend %d", ret); |
514 | sp->need_resend = true; |
515 | rxrpc_instant_resend(call); |
516 | } |
517 | |
518 | _leave(""); |
519 | } |
520 | |
521 | /* |
522 | * send data through a socket |
523 | * - must be called in process context |
524 | * - caller holds the socket locked |
525 | */ |
526 | static int rxrpc_send_data(struct kiocb *iocb, |
527 | struct rxrpc_sock *rx, |
528 | struct rxrpc_call *call, |
529 | struct msghdr *msg, size_t len) |
530 | { |
531 | struct rxrpc_skb_priv *sp; |
532 | unsigned char __user *from; |
533 | struct sk_buff *skb; |
534 | struct iovec *iov; |
535 | struct sock *sk = &rx->sk; |
536 | long timeo; |
537 | bool more; |
538 | int ret, ioc, segment, copied; |
539 | |
540 | _enter(",,,{%zu},%zu", msg->msg_iovlen, len); |
541 | |
542 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
543 | |
544 | /* this should be in poll */ |
545 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
546 | |
547 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
548 | return -EPIPE; |
549 | |
550 | iov = msg->msg_iov; |
551 | ioc = msg->msg_iovlen - 1; |
552 | from = iov->iov_base; |
553 | segment = iov->iov_len; |
554 | iov++; |
555 | more = msg->msg_flags & MSG_MORE; |
556 | |
557 | skb = call->tx_pending; |
558 | call->tx_pending = NULL; |
559 | |
560 | copied = 0; |
561 | do { |
562 | int copy; |
563 | |
564 | if (segment > len) |
565 | segment = len; |
566 | |
567 | _debug("SEGMENT %d @%p", segment, from); |
568 | |
569 | if (!skb) { |
570 | size_t size, chunk, max, space; |
571 | |
572 | _debug("alloc"); |
573 | |
574 | if (CIRC_SPACE(call->acks_head, call->acks_tail, |
575 | call->acks_winsz) <= 0) { |
576 | ret = -EAGAIN; |
577 | if (msg->msg_flags & MSG_DONTWAIT) |
578 | goto maybe_error; |
579 | ret = rxrpc_wait_for_tx_window(rx, call, |
580 | &timeo); |
581 | if (ret < 0) |
582 | goto maybe_error; |
583 | } |
584 | |
585 | max = call->conn->trans->peer->maxdata; |
586 | max -= call->conn->security_size; |
587 | max &= ~(call->conn->size_align - 1UL); |
588 | |
589 | chunk = max; |
590 | if (chunk > len && !more) |
591 | chunk = len; |
592 | |
593 | space = chunk + call->conn->size_align; |
594 | space &= ~(call->conn->size_align - 1UL); |
595 | |
596 | size = space + call->conn->header_size; |
597 | |
598 | _debug("SIZE: %zu/%zu/%zu", chunk, space, size); |
599 | |
600 | /* create a buffer that we can retain until it's ACK'd */ |
601 | skb = sock_alloc_send_skb( |
602 | sk, size, msg->msg_flags & MSG_DONTWAIT, &ret); |
603 | if (!skb) |
604 | goto maybe_error; |
605 | |
606 | rxrpc_new_skb(skb); |
607 | |
608 | _debug("ALLOC SEND %p", skb); |
609 | |
610 | ASSERTCMP(skb->mark, ==, 0); |
611 | |
612 | _debug("HS: %u", call->conn->header_size); |
613 | skb_reserve(skb, call->conn->header_size); |
614 | skb->len += call->conn->header_size; |
615 | |
616 | sp = rxrpc_skb(skb); |
617 | sp->remain = chunk; |
618 | if (sp->remain > skb_tailroom(skb)) |
619 | sp->remain = skb_tailroom(skb); |
620 | |
621 | _net("skb: hr %d, tr %d, hl %d, rm %d", |
622 | skb_headroom(skb), |
623 | skb_tailroom(skb), |
624 | skb_headlen(skb), |
625 | sp->remain); |
626 | |
627 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
628 | } |
629 | |
630 | _debug("append"); |
631 | sp = rxrpc_skb(skb); |
632 | |
633 | /* append next segment of data to the current buffer */ |
634 | copy = skb_tailroom(skb); |
635 | ASSERTCMP(copy, >, 0); |
636 | if (copy > segment) |
637 | copy = segment; |
638 | if (copy > sp->remain) |
639 | copy = sp->remain; |
640 | |
641 | _debug("add"); |
642 | ret = skb_add_data(skb, from, copy); |
643 | _debug("added"); |
644 | if (ret < 0) |
645 | goto efault; |
646 | sp->remain -= copy; |
647 | skb->mark += copy; |
648 | copied += copy; |
649 | |
650 | len -= copy; |
651 | segment -= copy; |
652 | from += copy; |
653 | while (segment == 0 && ioc > 0) { |
654 | from = iov->iov_base; |
655 | segment = iov->iov_len; |
656 | iov++; |
657 | ioc--; |
658 | } |
659 | if (len == 0) { |
660 | segment = 0; |
661 | ioc = 0; |
662 | } |
663 | |
664 | /* check for the far side aborting the call or a network error |
665 | * occurring */ |
666 | if (call->state > RXRPC_CALL_COMPLETE) |
667 | goto call_aborted; |
668 | |
669 | /* add the packet to the send queue if it's now full */ |
670 | if (sp->remain <= 0 || (segment == 0 && !more)) { |
671 | struct rxrpc_connection *conn = call->conn; |
672 | uint32_t seq; |
673 | size_t pad; |
674 | |
675 | /* pad out if we're using security */ |
676 | if (conn->security) { |
677 | pad = conn->security_size + skb->mark; |
678 | pad = conn->size_align - pad; |
679 | pad &= conn->size_align - 1; |
680 | _debug("pad %zu", pad); |
681 | if (pad) |
682 | memset(skb_put(skb, pad), 0, pad); |
683 | } |
684 | |
685 | seq = atomic_inc_return(&call->sequence); |
686 | |
687 | sp->hdr.epoch = conn->epoch; |
688 | sp->hdr.cid = call->cid; |
689 | sp->hdr.callNumber = call->call_id; |
690 | sp->hdr.seq = htonl(seq); |
691 | sp->hdr.serial = |
692 | htonl(atomic_inc_return(&conn->serial)); |
693 | sp->hdr.type = RXRPC_PACKET_TYPE_DATA; |
694 | sp->hdr.userStatus = 0; |
695 | sp->hdr.securityIndex = conn->security_ix; |
696 | sp->hdr._rsvd = 0; |
697 | sp->hdr.serviceId = conn->service_id; |
698 | |
699 | sp->hdr.flags = conn->out_clientflag; |
700 | if (len == 0 && !more) |
701 | sp->hdr.flags |= RXRPC_LAST_PACKET; |
702 | else if (CIRC_SPACE(call->acks_head, call->acks_tail, |
703 | call->acks_winsz) > 1) |
704 | sp->hdr.flags |= RXRPC_MORE_PACKETS; |
705 | if (more && seq & 1) |
706 | sp->hdr.flags |= RXRPC_REQUEST_ACK; |
707 | |
708 | ret = rxrpc_secure_packet( |
709 | call, skb, skb->mark, |
710 | skb->head + sizeof(struct rxrpc_header)); |
711 | if (ret < 0) |
712 | goto out; |
713 | |
714 | memcpy(skb->head, &sp->hdr, |
715 | sizeof(struct rxrpc_header)); |
716 | rxrpc_queue_packet(call, skb, segment == 0 && !more); |
717 | skb = NULL; |
718 | } |
719 | |
720 | } while (segment > 0); |
721 | |
722 | success: |
723 | ret = copied; |
724 | out: |
725 | call->tx_pending = skb; |
726 | _leave(" = %d", ret); |
727 | return ret; |
728 | |
729 | call_aborted: |
730 | rxrpc_free_skb(skb); |
731 | if (call->state == RXRPC_CALL_NETWORK_ERROR) |
732 | ret = call->conn->trans->peer->net_error; |
733 | else |
734 | ret = -ECONNABORTED; |
735 | _leave(" = %d", ret); |
736 | return ret; |
737 | |
738 | maybe_error: |
739 | if (copied) |
740 | goto success; |
741 | goto out; |
742 | |
743 | efault: |
744 | ret = -EFAULT; |
745 | goto out; |
746 | } |
747 |
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ben-wpan
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9