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17926a79 DH |
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/skbuff.h> | |
14 | #include <linux/circ_buf.h> | |
15 | #include <net/sock.h> | |
16 | #include <net/af_rxrpc.h> | |
17 | #include "ar-internal.h" | |
18 | ||
19 | int rxrpc_resend_timeout = 4; | |
20 | ||
21 | static int rxrpc_send_data(struct kiocb *iocb, | |
22 | struct rxrpc_sock *rx, | |
23 | struct rxrpc_call *call, | |
24 | struct msghdr *msg, size_t len); | |
25 | ||
26 | /* | |
27 | * extract control messages from the sendmsg() control buffer | |
28 | */ | |
29 | static int rxrpc_sendmsg_cmsg(struct rxrpc_sock *rx, struct msghdr *msg, | |
30 | unsigned long *user_call_ID, | |
31 | enum rxrpc_command *command, | |
32 | u32 *abort_code, | |
33 | bool server) | |
34 | { | |
35 | struct cmsghdr *cmsg; | |
36 | int len; | |
37 | ||
38 | *command = RXRPC_CMD_SEND_DATA; | |
39 | ||
40 | if (msg->msg_controllen == 0) | |
41 | return -EINVAL; | |
42 | ||
43 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
44 | if (!CMSG_OK(msg, cmsg)) | |
45 | return -EINVAL; | |
46 | ||
47 | len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
48 | _debug("CMSG %d, %d, %d", | |
49 | cmsg->cmsg_level, cmsg->cmsg_type, len); | |
50 | ||
51 | if (cmsg->cmsg_level != SOL_RXRPC) | |
52 | continue; | |
53 | ||
54 | switch (cmsg->cmsg_type) { | |
55 | case RXRPC_USER_CALL_ID: | |
56 | if (msg->msg_flags & MSG_CMSG_COMPAT) { | |
57 | if (len != sizeof(u32)) | |
58 | return -EINVAL; | |
59 | *user_call_ID = *(u32 *) CMSG_DATA(cmsg); | |
60 | } else { | |
61 | if (len != sizeof(unsigned long)) | |
62 | return -EINVAL; | |
63 | *user_call_ID = *(unsigned long *) | |
64 | CMSG_DATA(cmsg); | |
65 | } | |
66 | _debug("User Call ID %lx", *user_call_ID); | |
67 | break; | |
68 | ||
69 | case RXRPC_ABORT: | |
70 | if (*command != RXRPC_CMD_SEND_DATA) | |
71 | return -EINVAL; | |
72 | *command = RXRPC_CMD_SEND_ABORT; | |
73 | if (len != sizeof(*abort_code)) | |
74 | return -EINVAL; | |
75 | *abort_code = *(unsigned int *) CMSG_DATA(cmsg); | |
76 | _debug("Abort %x", *abort_code); | |
77 | if (*abort_code == 0) | |
78 | return -EINVAL; | |
79 | break; | |
80 | ||
81 | case RXRPC_ACCEPT: | |
82 | if (*command != RXRPC_CMD_SEND_DATA) | |
83 | return -EINVAL; | |
84 | *command = RXRPC_CMD_ACCEPT; | |
85 | if (len != 0) | |
86 | return -EINVAL; | |
87 | if (!server) | |
88 | return -EISCONN; | |
89 | break; | |
90 | ||
91 | default: | |
92 | return -EINVAL; | |
93 | } | |
94 | } | |
95 | ||
96 | _leave(" = 0"); | |
97 | return 0; | |
98 | } | |
99 | ||
100 | /* | |
101 | * abort a call, sending an ABORT packet to the peer | |
102 | */ | |
103 | static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code) | |
104 | { | |
105 | write_lock_bh(&call->state_lock); | |
106 | ||
107 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
108 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
109 | call->abort_code = abort_code; | |
110 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
111 | del_timer_sync(&call->resend_timer); | |
112 | del_timer_sync(&call->ack_timer); | |
113 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
114 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
115 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
651350d1 | 116 | rxrpc_queue_call(call); |
17926a79 DH |
117 | } |
118 | ||
119 | write_unlock_bh(&call->state_lock); | |
120 | } | |
121 | ||
122 | /* | |
123 | * send a message forming part of a client call through an RxRPC socket | |
124 | * - caller holds the socket locked | |
125 | * - the socket may be either a client socket or a server socket | |
126 | */ | |
127 | int rxrpc_client_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx, | |
128 | struct rxrpc_transport *trans, struct msghdr *msg, | |
129 | size_t len) | |
130 | { | |
131 | struct rxrpc_conn_bundle *bundle; | |
132 | enum rxrpc_command cmd; | |
133 | struct rxrpc_call *call; | |
134 | unsigned long user_call_ID = 0; | |
135 | struct key *key; | |
136 | __be16 service_id; | |
137 | u32 abort_code = 0; | |
138 | int ret; | |
139 | ||
140 | _enter(""); | |
141 | ||
142 | ASSERT(trans != NULL); | |
143 | ||
144 | ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code, | |
145 | false); | |
146 | if (ret < 0) | |
147 | return ret; | |
148 | ||
149 | bundle = NULL; | |
150 | if (trans) { | |
151 | service_id = rx->service_id; | |
152 | if (msg->msg_name) { | |
153 | struct sockaddr_rxrpc *srx = | |
154 | (struct sockaddr_rxrpc *) msg->msg_name; | |
155 | service_id = htons(srx->srx_service); | |
156 | } | |
157 | key = rx->key; | |
158 | if (key && !rx->key->payload.data) | |
159 | key = NULL; | |
160 | bundle = rxrpc_get_bundle(rx, trans, key, service_id, | |
161 | GFP_KERNEL); | |
162 | if (IS_ERR(bundle)) | |
163 | return PTR_ERR(bundle); | |
164 | } | |
165 | ||
166 | call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, | |
167 | abort_code == 0, GFP_KERNEL); | |
168 | if (trans) | |
169 | rxrpc_put_bundle(trans, bundle); | |
170 | if (IS_ERR(call)) { | |
171 | _leave(" = %ld", PTR_ERR(call)); | |
172 | return PTR_ERR(call); | |
173 | } | |
174 | ||
175 | _debug("CALL %d USR %lx ST %d on CONN %p", | |
176 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
177 | ||
178 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
179 | /* it's too late for this call */ | |
180 | ret = -ESHUTDOWN; | |
181 | } else if (cmd == RXRPC_CMD_SEND_ABORT) { | |
182 | rxrpc_send_abort(call, abort_code); | |
183 | } else if (cmd != RXRPC_CMD_SEND_DATA) { | |
184 | ret = -EINVAL; | |
185 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) { | |
186 | /* request phase complete for this client call */ | |
187 | ret = -EPROTO; | |
188 | } else { | |
189 | ret = rxrpc_send_data(iocb, rx, call, msg, len); | |
190 | } | |
191 | ||
192 | rxrpc_put_call(call); | |
193 | _leave(" = %d", ret); | |
194 | return ret; | |
195 | } | |
196 | ||
651350d1 DH |
197 | /** |
198 | * rxrpc_kernel_send_data - Allow a kernel service to send data on a call | |
199 | * @call: The call to send data through | |
200 | * @msg: The data to send | |
201 | * @len: The amount of data to send | |
202 | * | |
203 | * Allow a kernel service to send data on a call. The call must be in an state | |
204 | * appropriate to sending data. No control data should be supplied in @msg, | |
205 | * nor should an address be supplied. MSG_MORE should be flagged if there's | |
206 | * more data to come, otherwise this data will end the transmission phase. | |
207 | */ | |
208 | int rxrpc_kernel_send_data(struct rxrpc_call *call, struct msghdr *msg, | |
209 | size_t len) | |
210 | { | |
211 | int ret; | |
212 | ||
213 | _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); | |
214 | ||
215 | ASSERTCMP(msg->msg_name, ==, NULL); | |
216 | ASSERTCMP(msg->msg_control, ==, NULL); | |
217 | ||
218 | lock_sock(&call->socket->sk); | |
219 | ||
220 | _debug("CALL %d USR %lx ST %d on CONN %p", | |
221 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
222 | ||
223 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
224 | ret = -ESHUTDOWN; /* it's too late for this call */ | |
225 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
226 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
227 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
228 | ret = -EPROTO; /* request phase complete for this client call */ | |
229 | } else { | |
230 | mm_segment_t oldfs = get_fs(); | |
231 | set_fs(KERNEL_DS); | |
232 | ret = rxrpc_send_data(NULL, call->socket, call, msg, len); | |
233 | set_fs(oldfs); | |
234 | } | |
235 | ||
236 | release_sock(&call->socket->sk); | |
237 | _leave(" = %d", ret); | |
238 | return ret; | |
239 | } | |
240 | ||
241 | EXPORT_SYMBOL(rxrpc_kernel_send_data); | |
242 | ||
243 | /* | |
244 | * rxrpc_kernel_abort_call - Allow a kernel service to abort a call | |
245 | * @call: The call to be aborted | |
246 | * @abort_code: The abort code to stick into the ABORT packet | |
247 | * | |
248 | * Allow a kernel service to abort a call, if it's still in an abortable state. | |
249 | */ | |
250 | void rxrpc_kernel_abort_call(struct rxrpc_call *call, u32 abort_code) | |
251 | { | |
252 | _enter("{%d},%d", call->debug_id, abort_code); | |
253 | ||
254 | lock_sock(&call->socket->sk); | |
255 | ||
256 | _debug("CALL %d USR %lx ST %d on CONN %p", | |
257 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
258 | ||
259 | if (call->state < RXRPC_CALL_COMPLETE) | |
260 | rxrpc_send_abort(call, abort_code); | |
261 | ||
262 | release_sock(&call->socket->sk); | |
263 | _leave(""); | |
264 | } | |
265 | ||
266 | EXPORT_SYMBOL(rxrpc_kernel_abort_call); | |
267 | ||
17926a79 DH |
268 | /* |
269 | * send a message through a server socket | |
270 | * - caller holds the socket locked | |
271 | */ | |
272 | int rxrpc_server_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx, | |
273 | struct msghdr *msg, size_t len) | |
274 | { | |
275 | enum rxrpc_command cmd; | |
276 | struct rxrpc_call *call; | |
277 | unsigned long user_call_ID = 0; | |
278 | u32 abort_code = 0; | |
279 | int ret; | |
280 | ||
281 | _enter(""); | |
282 | ||
283 | ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code, | |
284 | true); | |
285 | if (ret < 0) | |
286 | return ret; | |
287 | ||
651350d1 DH |
288 | if (cmd == RXRPC_CMD_ACCEPT) { |
289 | call = rxrpc_accept_call(rx, user_call_ID); | |
290 | if (IS_ERR(call)) | |
291 | return PTR_ERR(call); | |
292 | rxrpc_put_call(call); | |
293 | return 0; | |
294 | } | |
17926a79 DH |
295 | |
296 | call = rxrpc_find_server_call(rx, user_call_ID); | |
297 | if (!call) | |
298 | return -EBADSLT; | |
299 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
300 | ret = -ESHUTDOWN; | |
301 | goto out; | |
302 | } | |
303 | ||
304 | switch (cmd) { | |
305 | case RXRPC_CMD_SEND_DATA: | |
306 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
307 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
308 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
309 | /* Tx phase not yet begun for this call */ | |
310 | ret = -EPROTO; | |
311 | break; | |
312 | } | |
313 | ||
314 | ret = rxrpc_send_data(iocb, rx, call, msg, len); | |
315 | break; | |
316 | ||
317 | case RXRPC_CMD_SEND_ABORT: | |
318 | rxrpc_send_abort(call, abort_code); | |
319 | break; | |
320 | default: | |
321 | BUG(); | |
322 | } | |
323 | ||
324 | out: | |
325 | rxrpc_put_call(call); | |
326 | _leave(" = %d", ret); | |
327 | return ret; | |
328 | } | |
329 | ||
330 | /* | |
331 | * send a packet through the transport endpoint | |
332 | */ | |
333 | int rxrpc_send_packet(struct rxrpc_transport *trans, struct sk_buff *skb) | |
334 | { | |
335 | struct kvec iov[1]; | |
336 | struct msghdr msg; | |
337 | int ret, opt; | |
338 | ||
339 | _enter(",{%d}", skb->len); | |
340 | ||
341 | iov[0].iov_base = skb->head; | |
342 | iov[0].iov_len = skb->len; | |
343 | ||
344 | msg.msg_name = &trans->peer->srx.transport.sin; | |
345 | msg.msg_namelen = sizeof(trans->peer->srx.transport.sin); | |
346 | msg.msg_control = NULL; | |
347 | msg.msg_controllen = 0; | |
348 | msg.msg_flags = 0; | |
349 | ||
350 | /* send the packet with the don't fragment bit set if we currently | |
351 | * think it's small enough */ | |
352 | if (skb->len - sizeof(struct rxrpc_header) < trans->peer->maxdata) { | |
353 | down_read(&trans->local->defrag_sem); | |
354 | /* send the packet by UDP | |
355 | * - returns -EMSGSIZE if UDP would have to fragment the packet | |
356 | * to go out of the interface | |
357 | * - in which case, we'll have processed the ICMP error | |
358 | * message and update the peer record | |
359 | */ | |
360 | ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1, | |
361 | iov[0].iov_len); | |
362 | ||
363 | up_read(&trans->local->defrag_sem); | |
364 | if (ret == -EMSGSIZE) | |
365 | goto send_fragmentable; | |
366 | ||
367 | _leave(" = %d [%u]", ret, trans->peer->maxdata); | |
368 | return ret; | |
369 | } | |
370 | ||
371 | send_fragmentable: | |
372 | /* attempt to send this message with fragmentation enabled */ | |
373 | _debug("send fragment"); | |
374 | ||
375 | down_write(&trans->local->defrag_sem); | |
376 | opt = IP_PMTUDISC_DONT; | |
377 | ret = kernel_setsockopt(trans->local->socket, SOL_IP, IP_MTU_DISCOVER, | |
378 | (char *) &opt, sizeof(opt)); | |
379 | if (ret == 0) { | |
380 | ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1, | |
381 | iov[0].iov_len); | |
382 | ||
383 | opt = IP_PMTUDISC_DO; | |
384 | kernel_setsockopt(trans->local->socket, SOL_IP, | |
385 | IP_MTU_DISCOVER, (char *) &opt, sizeof(opt)); | |
386 | } | |
387 | ||
388 | up_write(&trans->local->defrag_sem); | |
389 | _leave(" = %d [frag %u]", ret, trans->peer->maxdata); | |
390 | return ret; | |
391 | } | |
392 | ||
393 | /* | |
394 | * wait for space to appear in the transmit/ACK window | |
395 | * - caller holds the socket locked | |
396 | */ | |
397 | static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, | |
398 | struct rxrpc_call *call, | |
399 | long *timeo) | |
400 | { | |
401 | DECLARE_WAITQUEUE(myself, current); | |
402 | int ret; | |
403 | ||
404 | _enter(",{%d},%ld", | |
405 | CIRC_SPACE(call->acks_head, call->acks_tail, call->acks_winsz), | |
406 | *timeo); | |
407 | ||
408 | add_wait_queue(&call->tx_waitq, &myself); | |
409 | ||
410 | for (;;) { | |
411 | set_current_state(TASK_INTERRUPTIBLE); | |
412 | ret = 0; | |
413 | if (CIRC_SPACE(call->acks_head, call->acks_tail, | |
414 | call->acks_winsz) > 0) | |
415 | break; | |
416 | if (signal_pending(current)) { | |
417 | ret = sock_intr_errno(*timeo); | |
418 | break; | |
419 | } | |
420 | ||
421 | release_sock(&rx->sk); | |
422 | *timeo = schedule_timeout(*timeo); | |
423 | lock_sock(&rx->sk); | |
424 | } | |
425 | ||
426 | remove_wait_queue(&call->tx_waitq, &myself); | |
427 | set_current_state(TASK_RUNNING); | |
428 | _leave(" = %d", ret); | |
429 | return ret; | |
430 | } | |
431 | ||
432 | /* | |
433 | * attempt to schedule an instant Tx resend | |
434 | */ | |
435 | static inline void rxrpc_instant_resend(struct rxrpc_call *call) | |
436 | { | |
437 | read_lock_bh(&call->state_lock); | |
438 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { | |
439 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
440 | if (call->state < RXRPC_CALL_COMPLETE && | |
441 | !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) | |
651350d1 | 442 | rxrpc_queue_call(call); |
17926a79 DH |
443 | } |
444 | read_unlock_bh(&call->state_lock); | |
445 | } | |
446 | ||
447 | /* | |
448 | * queue a packet for transmission, set the resend timer and attempt | |
449 | * to send the packet immediately | |
450 | */ | |
451 | static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb, | |
452 | bool last) | |
453 | { | |
454 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
455 | int ret; | |
456 | ||
457 | _net("queue skb %p [%d]", skb, call->acks_head); | |
458 | ||
459 | ASSERT(call->acks_window != NULL); | |
460 | call->acks_window[call->acks_head] = (unsigned long) skb; | |
461 | smp_wmb(); | |
462 | call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1); | |
463 | ||
464 | if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { | |
465 | _debug("________awaiting reply/ACK__________"); | |
466 | write_lock_bh(&call->state_lock); | |
467 | switch (call->state) { | |
468 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
469 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; | |
470 | break; | |
471 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
472 | call->state = RXRPC_CALL_SERVER_SEND_REPLY; | |
473 | if (!last) | |
474 | break; | |
475 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
476 | call->state = RXRPC_CALL_SERVER_AWAIT_ACK; | |
477 | break; | |
478 | default: | |
479 | break; | |
480 | } | |
481 | write_unlock_bh(&call->state_lock); | |
482 | } | |
483 | ||
484 | _proto("Tx DATA %%%u { #%u }", | |
485 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
486 | ||
487 | sp->need_resend = 0; | |
488 | sp->resend_at = jiffies + rxrpc_resend_timeout * HZ; | |
489 | if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) { | |
490 | _debug("run timer"); | |
491 | call->resend_timer.expires = sp->resend_at; | |
492 | add_timer(&call->resend_timer); | |
493 | } | |
494 | ||
495 | /* attempt to cancel the rx-ACK timer, deferring reply transmission if | |
496 | * we're ACK'ing the request phase of an incoming call */ | |
497 | ret = -EAGAIN; | |
498 | if (try_to_del_timer_sync(&call->ack_timer) >= 0) { | |
499 | /* the packet may be freed by rxrpc_process_call() before this | |
500 | * returns */ | |
501 | ret = rxrpc_send_packet(call->conn->trans, skb); | |
502 | _net("sent skb %p", skb); | |
503 | } else { | |
504 | _debug("failed to delete ACK timer"); | |
505 | } | |
506 | ||
507 | if (ret < 0) { | |
508 | _debug("need instant resend %d", ret); | |
509 | sp->need_resend = 1; | |
510 | rxrpc_instant_resend(call); | |
511 | } | |
512 | ||
513 | _leave(""); | |
514 | } | |
515 | ||
516 | /* | |
517 | * send data through a socket | |
518 | * - must be called in process context | |
519 | * - caller holds the socket locked | |
520 | */ | |
521 | static int rxrpc_send_data(struct kiocb *iocb, | |
522 | struct rxrpc_sock *rx, | |
523 | struct rxrpc_call *call, | |
524 | struct msghdr *msg, size_t len) | |
525 | { | |
526 | struct rxrpc_skb_priv *sp; | |
527 | unsigned char __user *from; | |
528 | struct sk_buff *skb; | |
529 | struct iovec *iov; | |
530 | struct sock *sk = &rx->sk; | |
531 | long timeo; | |
532 | bool more; | |
533 | int ret, ioc, segment, copied; | |
534 | ||
535 | _enter(",,,{%zu},%zu", msg->msg_iovlen, len); | |
536 | ||
537 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
538 | ||
539 | /* this should be in poll */ | |
540 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
541 | ||
542 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
543 | return -EPIPE; | |
544 | ||
545 | iov = msg->msg_iov; | |
546 | ioc = msg->msg_iovlen - 1; | |
547 | from = iov->iov_base; | |
548 | segment = iov->iov_len; | |
549 | iov++; | |
550 | more = msg->msg_flags & MSG_MORE; | |
551 | ||
552 | skb = call->tx_pending; | |
553 | call->tx_pending = NULL; | |
554 | ||
555 | copied = 0; | |
556 | do { | |
557 | int copy; | |
558 | ||
559 | if (segment > len) | |
560 | segment = len; | |
561 | ||
562 | _debug("SEGMENT %d @%p", segment, from); | |
563 | ||
564 | if (!skb) { | |
565 | size_t size, chunk, max, space; | |
566 | ||
567 | _debug("alloc"); | |
568 | ||
569 | if (CIRC_SPACE(call->acks_head, call->acks_tail, | |
570 | call->acks_winsz) <= 0) { | |
571 | ret = -EAGAIN; | |
572 | if (msg->msg_flags & MSG_DONTWAIT) | |
573 | goto maybe_error; | |
574 | ret = rxrpc_wait_for_tx_window(rx, call, | |
575 | &timeo); | |
576 | if (ret < 0) | |
577 | goto maybe_error; | |
578 | } | |
579 | ||
580 | max = call->conn->trans->peer->maxdata; | |
581 | max -= call->conn->security_size; | |
582 | max &= ~(call->conn->size_align - 1UL); | |
583 | ||
584 | chunk = max; | |
224711df | 585 | if (chunk > len && !more) |
17926a79 DH |
586 | chunk = len; |
587 | ||
588 | space = chunk + call->conn->size_align; | |
589 | space &= ~(call->conn->size_align - 1UL); | |
590 | ||
591 | size = space + call->conn->header_size; | |
592 | ||
593 | _debug("SIZE: %zu/%zu/%zu", chunk, space, size); | |
594 | ||
595 | /* create a buffer that we can retain until it's ACK'd */ | |
596 | skb = sock_alloc_send_skb( | |
597 | sk, size, msg->msg_flags & MSG_DONTWAIT, &ret); | |
598 | if (!skb) | |
599 | goto maybe_error; | |
600 | ||
601 | rxrpc_new_skb(skb); | |
602 | ||
603 | _debug("ALLOC SEND %p", skb); | |
604 | ||
605 | ASSERTCMP(skb->mark, ==, 0); | |
606 | ||
607 | _debug("HS: %u", call->conn->header_size); | |
608 | skb_reserve(skb, call->conn->header_size); | |
609 | skb->len += call->conn->header_size; | |
610 | ||
611 | sp = rxrpc_skb(skb); | |
612 | sp->remain = chunk; | |
613 | if (sp->remain > skb_tailroom(skb)) | |
614 | sp->remain = skb_tailroom(skb); | |
615 | ||
616 | _net("skb: hr %d, tr %d, hl %d, rm %d", | |
617 | skb_headroom(skb), | |
618 | skb_tailroom(skb), | |
619 | skb_headlen(skb), | |
620 | sp->remain); | |
621 | ||
622 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
623 | } | |
624 | ||
625 | _debug("append"); | |
626 | sp = rxrpc_skb(skb); | |
627 | ||
628 | /* append next segment of data to the current buffer */ | |
629 | copy = skb_tailroom(skb); | |
630 | ASSERTCMP(copy, >, 0); | |
631 | if (copy > segment) | |
632 | copy = segment; | |
633 | if (copy > sp->remain) | |
634 | copy = sp->remain; | |
635 | ||
636 | _debug("add"); | |
637 | ret = skb_add_data(skb, from, copy); | |
638 | _debug("added"); | |
639 | if (ret < 0) | |
640 | goto efault; | |
641 | sp->remain -= copy; | |
642 | skb->mark += copy; | |
19e6454c | 643 | copied += copy; |
17926a79 DH |
644 | |
645 | len -= copy; | |
646 | segment -= copy; | |
647 | from += copy; | |
648 | while (segment == 0 && ioc > 0) { | |
649 | from = iov->iov_base; | |
650 | segment = iov->iov_len; | |
651 | iov++; | |
652 | ioc--; | |
653 | } | |
654 | if (len == 0) { | |
655 | segment = 0; | |
656 | ioc = 0; | |
657 | } | |
658 | ||
659 | /* check for the far side aborting the call or a network error | |
660 | * occurring */ | |
661 | if (call->state > RXRPC_CALL_COMPLETE) | |
662 | goto call_aborted; | |
663 | ||
664 | /* add the packet to the send queue if it's now full */ | |
665 | if (sp->remain <= 0 || (segment == 0 && !more)) { | |
666 | struct rxrpc_connection *conn = call->conn; | |
667 | size_t pad; | |
668 | ||
669 | /* pad out if we're using security */ | |
670 | if (conn->security) { | |
671 | pad = conn->security_size + skb->mark; | |
672 | pad = conn->size_align - pad; | |
673 | pad &= conn->size_align - 1; | |
674 | _debug("pad %zu", pad); | |
675 | if (pad) | |
676 | memset(skb_put(skb, pad), 0, pad); | |
677 | } | |
678 | ||
679 | sp->hdr.epoch = conn->epoch; | |
680 | sp->hdr.cid = call->cid; | |
681 | sp->hdr.callNumber = call->call_id; | |
682 | sp->hdr.seq = | |
683 | htonl(atomic_inc_return(&call->sequence)); | |
684 | sp->hdr.serial = | |
685 | htonl(atomic_inc_return(&conn->serial)); | |
686 | sp->hdr.type = RXRPC_PACKET_TYPE_DATA; | |
687 | sp->hdr.userStatus = 0; | |
688 | sp->hdr.securityIndex = conn->security_ix; | |
689 | sp->hdr._rsvd = 0; | |
690 | sp->hdr.serviceId = conn->service_id; | |
691 | ||
692 | sp->hdr.flags = conn->out_clientflag; | |
693 | if (len == 0 && !more) | |
694 | sp->hdr.flags |= RXRPC_LAST_PACKET; | |
695 | else if (CIRC_SPACE(call->acks_head, call->acks_tail, | |
696 | call->acks_winsz) > 1) | |
697 | sp->hdr.flags |= RXRPC_MORE_PACKETS; | |
698 | ||
699 | ret = rxrpc_secure_packet( | |
700 | call, skb, skb->mark, | |
701 | skb->head + sizeof(struct rxrpc_header)); | |
702 | if (ret < 0) | |
703 | goto out; | |
704 | ||
705 | memcpy(skb->head, &sp->hdr, | |
706 | sizeof(struct rxrpc_header)); | |
707 | rxrpc_queue_packet(call, skb, segment == 0 && !more); | |
708 | skb = NULL; | |
709 | } | |
710 | ||
711 | } while (segment > 0); | |
712 | ||
19e6454c DH |
713 | success: |
714 | ret = copied; | |
17926a79 DH |
715 | out: |
716 | call->tx_pending = skb; | |
717 | _leave(" = %d", ret); | |
718 | return ret; | |
719 | ||
720 | call_aborted: | |
721 | rxrpc_free_skb(skb); | |
722 | if (call->state == RXRPC_CALL_NETWORK_ERROR) | |
723 | ret = call->conn->trans->peer->net_error; | |
724 | else | |
725 | ret = -ECONNABORTED; | |
726 | _leave(" = %d", ret); | |
727 | return ret; | |
728 | ||
729 | maybe_error: | |
730 | if (copied) | |
19e6454c | 731 | goto success; |
17926a79 DH |
732 | goto out; |
733 | ||
734 | efault: | |
735 | ret = -EFAULT; | |
736 | goto out; | |
737 | } |