Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
17926a79 DH |
14 | #include <linux/skbuff.h> |
15 | #include <linux/circ_buf.h> | |
bc3b2d7f | 16 | #include <linux/export.h> |
17926a79 DH |
17 | #include <net/sock.h> |
18 | #include <net/af_rxrpc.h> | |
19 | #include "ar-internal.h" | |
20 | ||
5873c083 DH |
21 | /* |
22 | * Time till packet resend (in jiffies). | |
23 | */ | |
24 | unsigned rxrpc_resend_timeout = 4 * HZ; | |
17926a79 | 25 | |
1b784140 | 26 | static int rxrpc_send_data(struct rxrpc_sock *rx, |
17926a79 DH |
27 | struct rxrpc_call *call, |
28 | struct msghdr *msg, size_t len); | |
29 | ||
30 | /* | |
31 | * extract control messages from the sendmsg() control buffer | |
32 | */ | |
33 | static int rxrpc_sendmsg_cmsg(struct rxrpc_sock *rx, struct msghdr *msg, | |
34 | unsigned long *user_call_ID, | |
35 | enum rxrpc_command *command, | |
36 | u32 *abort_code, | |
37 | bool server) | |
38 | { | |
39 | struct cmsghdr *cmsg; | |
40 | int len; | |
41 | ||
42 | *command = RXRPC_CMD_SEND_DATA; | |
43 | ||
44 | if (msg->msg_controllen == 0) | |
45 | return -EINVAL; | |
46 | ||
f95b414e | 47 | for_each_cmsghdr(cmsg, msg) { |
17926a79 DH |
48 | if (!CMSG_OK(msg, cmsg)) |
49 | return -EINVAL; | |
50 | ||
51 | len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
52 | _debug("CMSG %d, %d, %d", | |
53 | cmsg->cmsg_level, cmsg->cmsg_type, len); | |
54 | ||
55 | if (cmsg->cmsg_level != SOL_RXRPC) | |
56 | continue; | |
57 | ||
58 | switch (cmsg->cmsg_type) { | |
59 | case RXRPC_USER_CALL_ID: | |
60 | if (msg->msg_flags & MSG_CMSG_COMPAT) { | |
61 | if (len != sizeof(u32)) | |
62 | return -EINVAL; | |
63 | *user_call_ID = *(u32 *) CMSG_DATA(cmsg); | |
64 | } else { | |
65 | if (len != sizeof(unsigned long)) | |
66 | return -EINVAL; | |
67 | *user_call_ID = *(unsigned long *) | |
68 | CMSG_DATA(cmsg); | |
69 | } | |
70 | _debug("User Call ID %lx", *user_call_ID); | |
71 | break; | |
72 | ||
73 | case RXRPC_ABORT: | |
74 | if (*command != RXRPC_CMD_SEND_DATA) | |
75 | return -EINVAL; | |
76 | *command = RXRPC_CMD_SEND_ABORT; | |
77 | if (len != sizeof(*abort_code)) | |
78 | return -EINVAL; | |
79 | *abort_code = *(unsigned int *) CMSG_DATA(cmsg); | |
80 | _debug("Abort %x", *abort_code); | |
81 | if (*abort_code == 0) | |
82 | return -EINVAL; | |
83 | break; | |
84 | ||
85 | case RXRPC_ACCEPT: | |
86 | if (*command != RXRPC_CMD_SEND_DATA) | |
87 | return -EINVAL; | |
88 | *command = RXRPC_CMD_ACCEPT; | |
89 | if (len != 0) | |
90 | return -EINVAL; | |
91 | if (!server) | |
92 | return -EISCONN; | |
93 | break; | |
94 | ||
95 | default: | |
96 | return -EINVAL; | |
97 | } | |
98 | } | |
99 | ||
100 | _leave(" = 0"); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | /* | |
105 | * abort a call, sending an ABORT packet to the peer | |
106 | */ | |
107 | static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code) | |
108 | { | |
109 | write_lock_bh(&call->state_lock); | |
110 | ||
111 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
112 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
113 | call->abort_code = abort_code; | |
114 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
115 | del_timer_sync(&call->resend_timer); | |
116 | del_timer_sync(&call->ack_timer); | |
117 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
118 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
119 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
651350d1 | 120 | rxrpc_queue_call(call); |
17926a79 DH |
121 | } |
122 | ||
123 | write_unlock_bh(&call->state_lock); | |
124 | } | |
125 | ||
126 | /* | |
127 | * send a message forming part of a client call through an RxRPC socket | |
128 | * - caller holds the socket locked | |
129 | * - the socket may be either a client socket or a server socket | |
130 | */ | |
1b784140 YX |
131 | int rxrpc_client_sendmsg(struct rxrpc_sock *rx, struct rxrpc_transport *trans, |
132 | struct msghdr *msg, size_t len) | |
17926a79 DH |
133 | { |
134 | struct rxrpc_conn_bundle *bundle; | |
135 | enum rxrpc_command cmd; | |
136 | struct rxrpc_call *call; | |
137 | unsigned long user_call_ID = 0; | |
138 | struct key *key; | |
139 | __be16 service_id; | |
140 | u32 abort_code = 0; | |
141 | int ret; | |
142 | ||
143 | _enter(""); | |
144 | ||
145 | ASSERT(trans != NULL); | |
146 | ||
147 | ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code, | |
148 | false); | |
149 | if (ret < 0) | |
150 | return ret; | |
151 | ||
152 | bundle = NULL; | |
153 | if (trans) { | |
154 | service_id = rx->service_id; | |
155 | if (msg->msg_name) { | |
342dfc30 SH |
156 | DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, |
157 | msg->msg_name); | |
17926a79 DH |
158 | service_id = htons(srx->srx_service); |
159 | } | |
160 | key = rx->key; | |
146aa8b1 | 161 | if (key && !rx->key->payload.data[0]) |
17926a79 DH |
162 | key = NULL; |
163 | bundle = rxrpc_get_bundle(rx, trans, key, service_id, | |
164 | GFP_KERNEL); | |
165 | if (IS_ERR(bundle)) | |
166 | return PTR_ERR(bundle); | |
167 | } | |
168 | ||
169 | call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, | |
170 | abort_code == 0, GFP_KERNEL); | |
171 | if (trans) | |
172 | rxrpc_put_bundle(trans, bundle); | |
173 | if (IS_ERR(call)) { | |
174 | _leave(" = %ld", PTR_ERR(call)); | |
175 | return PTR_ERR(call); | |
176 | } | |
177 | ||
178 | _debug("CALL %d USR %lx ST %d on CONN %p", | |
179 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
180 | ||
181 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
182 | /* it's too late for this call */ | |
183 | ret = -ESHUTDOWN; | |
184 | } else if (cmd == RXRPC_CMD_SEND_ABORT) { | |
185 | rxrpc_send_abort(call, abort_code); | |
186 | } else if (cmd != RXRPC_CMD_SEND_DATA) { | |
187 | ret = -EINVAL; | |
188 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) { | |
189 | /* request phase complete for this client call */ | |
190 | ret = -EPROTO; | |
191 | } else { | |
1b784140 | 192 | ret = rxrpc_send_data(rx, call, msg, len); |
17926a79 DH |
193 | } |
194 | ||
195 | rxrpc_put_call(call); | |
196 | _leave(" = %d", ret); | |
197 | return ret; | |
198 | } | |
199 | ||
651350d1 DH |
200 | /** |
201 | * rxrpc_kernel_send_data - Allow a kernel service to send data on a call | |
202 | * @call: The call to send data through | |
203 | * @msg: The data to send | |
204 | * @len: The amount of data to send | |
205 | * | |
206 | * Allow a kernel service to send data on a call. The call must be in an state | |
207 | * appropriate to sending data. No control data should be supplied in @msg, | |
208 | * nor should an address be supplied. MSG_MORE should be flagged if there's | |
209 | * more data to come, otherwise this data will end the transmission phase. | |
210 | */ | |
211 | int rxrpc_kernel_send_data(struct rxrpc_call *call, struct msghdr *msg, | |
212 | size_t len) | |
213 | { | |
214 | int ret; | |
215 | ||
216 | _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); | |
217 | ||
218 | ASSERTCMP(msg->msg_name, ==, NULL); | |
219 | ASSERTCMP(msg->msg_control, ==, NULL); | |
220 | ||
221 | lock_sock(&call->socket->sk); | |
222 | ||
223 | _debug("CALL %d USR %lx ST %d on CONN %p", | |
224 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
225 | ||
226 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
227 | ret = -ESHUTDOWN; /* it's too late for this call */ | |
228 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
229 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
230 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
231 | ret = -EPROTO; /* request phase complete for this client call */ | |
232 | } else { | |
1b784140 | 233 | ret = rxrpc_send_data(call->socket, call, msg, len); |
651350d1 DH |
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 | ||
2c53040f | 243 | /** |
651350d1 DH |
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 | */ | |
1b784140 | 272 | int rxrpc_server_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len) |
17926a79 DH |
273 | { |
274 | enum rxrpc_command cmd; | |
275 | struct rxrpc_call *call; | |
276 | unsigned long user_call_ID = 0; | |
277 | u32 abort_code = 0; | |
278 | int ret; | |
279 | ||
280 | _enter(""); | |
281 | ||
282 | ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code, | |
283 | true); | |
284 | if (ret < 0) | |
285 | return ret; | |
286 | ||
651350d1 DH |
287 | if (cmd == RXRPC_CMD_ACCEPT) { |
288 | call = rxrpc_accept_call(rx, user_call_ID); | |
289 | if (IS_ERR(call)) | |
290 | return PTR_ERR(call); | |
291 | rxrpc_put_call(call); | |
292 | return 0; | |
293 | } | |
17926a79 DH |
294 | |
295 | call = rxrpc_find_server_call(rx, user_call_ID); | |
296 | if (!call) | |
297 | return -EBADSLT; | |
298 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
299 | ret = -ESHUTDOWN; | |
300 | goto out; | |
301 | } | |
302 | ||
303 | switch (cmd) { | |
304 | case RXRPC_CMD_SEND_DATA: | |
305 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
306 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
307 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
308 | /* Tx phase not yet begun for this call */ | |
309 | ret = -EPROTO; | |
310 | break; | |
311 | } | |
312 | ||
1b784140 | 313 | ret = rxrpc_send_data(rx, call, msg, len); |
17926a79 DH |
314 | break; |
315 | ||
316 | case RXRPC_CMD_SEND_ABORT: | |
317 | rxrpc_send_abort(call, abort_code); | |
318 | break; | |
319 | default: | |
320 | BUG(); | |
321 | } | |
322 | ||
323 | out: | |
324 | rxrpc_put_call(call); | |
325 | _leave(" = %d", ret); | |
326 | return ret; | |
327 | } | |
328 | ||
329 | /* | |
330 | * send a packet through the transport endpoint | |
331 | */ | |
332 | int rxrpc_send_packet(struct rxrpc_transport *trans, struct sk_buff *skb) | |
333 | { | |
334 | struct kvec iov[1]; | |
335 | struct msghdr msg; | |
336 | int ret, opt; | |
337 | ||
338 | _enter(",{%d}", skb->len); | |
339 | ||
340 | iov[0].iov_base = skb->head; | |
341 | iov[0].iov_len = skb->len; | |
342 | ||
343 | msg.msg_name = &trans->peer->srx.transport.sin; | |
344 | msg.msg_namelen = sizeof(trans->peer->srx.transport.sin); | |
345 | msg.msg_control = NULL; | |
346 | msg.msg_controllen = 0; | |
347 | msg.msg_flags = 0; | |
348 | ||
349 | /* send the packet with the don't fragment bit set if we currently | |
350 | * think it's small enough */ | |
351 | if (skb->len - sizeof(struct rxrpc_header) < trans->peer->maxdata) { | |
352 | down_read(&trans->local->defrag_sem); | |
353 | /* send the packet by UDP | |
354 | * - returns -EMSGSIZE if UDP would have to fragment the packet | |
355 | * to go out of the interface | |
356 | * - in which case, we'll have processed the ICMP error | |
357 | * message and update the peer record | |
358 | */ | |
359 | ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1, | |
360 | iov[0].iov_len); | |
361 | ||
362 | up_read(&trans->local->defrag_sem); | |
363 | if (ret == -EMSGSIZE) | |
364 | goto send_fragmentable; | |
365 | ||
366 | _leave(" = %d [%u]", ret, trans->peer->maxdata); | |
367 | return ret; | |
368 | } | |
369 | ||
370 | send_fragmentable: | |
371 | /* attempt to send this message with fragmentation enabled */ | |
372 | _debug("send fragment"); | |
373 | ||
374 | down_write(&trans->local->defrag_sem); | |
375 | opt = IP_PMTUDISC_DONT; | |
376 | ret = kernel_setsockopt(trans->local->socket, SOL_IP, IP_MTU_DISCOVER, | |
377 | (char *) &opt, sizeof(opt)); | |
378 | if (ret == 0) { | |
379 | ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1, | |
380 | iov[0].iov_len); | |
381 | ||
382 | opt = IP_PMTUDISC_DO; | |
383 | kernel_setsockopt(trans->local->socket, SOL_IP, | |
384 | IP_MTU_DISCOVER, (char *) &opt, sizeof(opt)); | |
385 | } | |
386 | ||
387 | up_write(&trans->local->defrag_sem); | |
388 | _leave(" = %d [frag %u]", ret, trans->peer->maxdata); | |
389 | return ret; | |
390 | } | |
391 | ||
392 | /* | |
393 | * wait for space to appear in the transmit/ACK window | |
394 | * - caller holds the socket locked | |
395 | */ | |
396 | static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, | |
397 | struct rxrpc_call *call, | |
398 | long *timeo) | |
399 | { | |
400 | DECLARE_WAITQUEUE(myself, current); | |
401 | int ret; | |
402 | ||
403 | _enter(",{%d},%ld", | |
404 | CIRC_SPACE(call->acks_head, call->acks_tail, call->acks_winsz), | |
405 | *timeo); | |
406 | ||
407 | add_wait_queue(&call->tx_waitq, &myself); | |
408 | ||
409 | for (;;) { | |
410 | set_current_state(TASK_INTERRUPTIBLE); | |
411 | ret = 0; | |
412 | if (CIRC_SPACE(call->acks_head, call->acks_tail, | |
413 | call->acks_winsz) > 0) | |
414 | break; | |
415 | if (signal_pending(current)) { | |
416 | ret = sock_intr_errno(*timeo); | |
417 | break; | |
418 | } | |
419 | ||
420 | release_sock(&rx->sk); | |
421 | *timeo = schedule_timeout(*timeo); | |
422 | lock_sock(&rx->sk); | |
423 | } | |
424 | ||
425 | remove_wait_queue(&call->tx_waitq, &myself); | |
426 | set_current_state(TASK_RUNNING); | |
427 | _leave(" = %d", ret); | |
428 | return ret; | |
429 | } | |
430 | ||
431 | /* | |
432 | * attempt to schedule an instant Tx resend | |
433 | */ | |
434 | static inline void rxrpc_instant_resend(struct rxrpc_call *call) | |
435 | { | |
436 | read_lock_bh(&call->state_lock); | |
437 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { | |
438 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
439 | if (call->state < RXRPC_CALL_COMPLETE && | |
440 | !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) | |
651350d1 | 441 | rxrpc_queue_call(call); |
17926a79 DH |
442 | } |
443 | read_unlock_bh(&call->state_lock); | |
444 | } | |
445 | ||
446 | /* | |
447 | * queue a packet for transmission, set the resend timer and attempt | |
448 | * to send the packet immediately | |
449 | */ | |
450 | static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb, | |
451 | bool last) | |
452 | { | |
453 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
454 | int ret; | |
455 | ||
456 | _net("queue skb %p [%d]", skb, call->acks_head); | |
457 | ||
458 | ASSERT(call->acks_window != NULL); | |
459 | call->acks_window[call->acks_head] = (unsigned long) skb; | |
460 | smp_wmb(); | |
461 | call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1); | |
462 | ||
463 | if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { | |
464 | _debug("________awaiting reply/ACK__________"); | |
465 | write_lock_bh(&call->state_lock); | |
466 | switch (call->state) { | |
467 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
468 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; | |
469 | break; | |
470 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
471 | call->state = RXRPC_CALL_SERVER_SEND_REPLY; | |
472 | if (!last) | |
473 | break; | |
474 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
475 | call->state = RXRPC_CALL_SERVER_AWAIT_ACK; | |
476 | break; | |
477 | default: | |
478 | break; | |
479 | } | |
480 | write_unlock_bh(&call->state_lock); | |
481 | } | |
482 | ||
483 | _proto("Tx DATA %%%u { #%u }", | |
484 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
485 | ||
3db1cd5c | 486 | sp->need_resend = false; |
5873c083 | 487 | sp->resend_at = jiffies + rxrpc_resend_timeout; |
17926a79 DH |
488 | if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) { |
489 | _debug("run timer"); | |
490 | call->resend_timer.expires = sp->resend_at; | |
491 | add_timer(&call->resend_timer); | |
492 | } | |
493 | ||
494 | /* attempt to cancel the rx-ACK timer, deferring reply transmission if | |
495 | * we're ACK'ing the request phase of an incoming call */ | |
496 | ret = -EAGAIN; | |
497 | if (try_to_del_timer_sync(&call->ack_timer) >= 0) { | |
498 | /* the packet may be freed by rxrpc_process_call() before this | |
499 | * returns */ | |
500 | ret = rxrpc_send_packet(call->conn->trans, skb); | |
501 | _net("sent skb %p", skb); | |
502 | } else { | |
503 | _debug("failed to delete ACK timer"); | |
504 | } | |
505 | ||
506 | if (ret < 0) { | |
507 | _debug("need instant resend %d", ret); | |
3db1cd5c | 508 | sp->need_resend = true; |
17926a79 DH |
509 | rxrpc_instant_resend(call); |
510 | } | |
511 | ||
512 | _leave(""); | |
513 | } | |
514 | ||
515 | /* | |
516 | * send data through a socket | |
517 | * - must be called in process context | |
518 | * - caller holds the socket locked | |
519 | */ | |
1b784140 | 520 | static int rxrpc_send_data(struct rxrpc_sock *rx, |
17926a79 DH |
521 | struct rxrpc_call *call, |
522 | struct msghdr *msg, size_t len) | |
523 | { | |
524 | struct rxrpc_skb_priv *sp; | |
17926a79 | 525 | struct sk_buff *skb; |
17926a79 DH |
526 | struct sock *sk = &rx->sk; |
527 | long timeo; | |
528 | bool more; | |
af2b040e | 529 | int ret, copied; |
17926a79 | 530 | |
17926a79 DH |
531 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
532 | ||
533 | /* this should be in poll */ | |
9cd3e072 | 534 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
17926a79 DH |
535 | |
536 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
537 | return -EPIPE; | |
538 | ||
17926a79 DH |
539 | more = msg->msg_flags & MSG_MORE; |
540 | ||
541 | skb = call->tx_pending; | |
542 | call->tx_pending = NULL; | |
543 | ||
544 | copied = 0; | |
3af6878e | 545 | do { |
17926a79 DH |
546 | if (!skb) { |
547 | size_t size, chunk, max, space; | |
548 | ||
549 | _debug("alloc"); | |
550 | ||
551 | if (CIRC_SPACE(call->acks_head, call->acks_tail, | |
552 | call->acks_winsz) <= 0) { | |
553 | ret = -EAGAIN; | |
554 | if (msg->msg_flags & MSG_DONTWAIT) | |
555 | goto maybe_error; | |
556 | ret = rxrpc_wait_for_tx_window(rx, call, | |
557 | &timeo); | |
558 | if (ret < 0) | |
559 | goto maybe_error; | |
560 | } | |
561 | ||
562 | max = call->conn->trans->peer->maxdata; | |
563 | max -= call->conn->security_size; | |
564 | max &= ~(call->conn->size_align - 1UL); | |
565 | ||
566 | chunk = max; | |
01e97e65 AV |
567 | if (chunk > msg_data_left(msg) && !more) |
568 | chunk = msg_data_left(msg); | |
17926a79 DH |
569 | |
570 | space = chunk + call->conn->size_align; | |
571 | space &= ~(call->conn->size_align - 1UL); | |
572 | ||
573 | size = space + call->conn->header_size; | |
574 | ||
575 | _debug("SIZE: %zu/%zu/%zu", chunk, space, size); | |
576 | ||
577 | /* create a buffer that we can retain until it's ACK'd */ | |
578 | skb = sock_alloc_send_skb( | |
579 | sk, size, msg->msg_flags & MSG_DONTWAIT, &ret); | |
580 | if (!skb) | |
581 | goto maybe_error; | |
582 | ||
583 | rxrpc_new_skb(skb); | |
584 | ||
585 | _debug("ALLOC SEND %p", skb); | |
586 | ||
587 | ASSERTCMP(skb->mark, ==, 0); | |
588 | ||
589 | _debug("HS: %u", call->conn->header_size); | |
590 | skb_reserve(skb, call->conn->header_size); | |
591 | skb->len += call->conn->header_size; | |
592 | ||
593 | sp = rxrpc_skb(skb); | |
594 | sp->remain = chunk; | |
595 | if (sp->remain > skb_tailroom(skb)) | |
596 | sp->remain = skb_tailroom(skb); | |
597 | ||
598 | _net("skb: hr %d, tr %d, hl %d, rm %d", | |
599 | skb_headroom(skb), | |
600 | skb_tailroom(skb), | |
601 | skb_headlen(skb), | |
602 | sp->remain); | |
603 | ||
604 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
605 | } | |
606 | ||
607 | _debug("append"); | |
608 | sp = rxrpc_skb(skb); | |
609 | ||
610 | /* append next segment of data to the current buffer */ | |
01e97e65 | 611 | if (msg_data_left(msg) > 0) { |
aab94830 DH |
612 | int copy = skb_tailroom(skb); |
613 | ASSERTCMP(copy, >, 0); | |
01e97e65 AV |
614 | if (copy > msg_data_left(msg)) |
615 | copy = msg_data_left(msg); | |
aab94830 DH |
616 | if (copy > sp->remain) |
617 | copy = sp->remain; | |
618 | ||
619 | _debug("add"); | |
620 | ret = skb_add_data(skb, &msg->msg_iter, copy); | |
621 | _debug("added"); | |
622 | if (ret < 0) | |
623 | goto efault; | |
624 | sp->remain -= copy; | |
625 | skb->mark += copy; | |
626 | copied += copy; | |
aab94830 | 627 | } |
17926a79 DH |
628 | |
629 | /* check for the far side aborting the call or a network error | |
630 | * occurring */ | |
631 | if (call->state > RXRPC_CALL_COMPLETE) | |
632 | goto call_aborted; | |
633 | ||
634 | /* add the packet to the send queue if it's now full */ | |
382d7974 | 635 | if (sp->remain <= 0 || |
01e97e65 | 636 | (msg_data_left(msg) == 0 && !more)) { |
17926a79 | 637 | struct rxrpc_connection *conn = call->conn; |
e8388eb1 | 638 | uint32_t seq; |
17926a79 DH |
639 | size_t pad; |
640 | ||
641 | /* pad out if we're using security */ | |
642 | if (conn->security) { | |
643 | pad = conn->security_size + skb->mark; | |
644 | pad = conn->size_align - pad; | |
645 | pad &= conn->size_align - 1; | |
646 | _debug("pad %zu", pad); | |
647 | if (pad) | |
648 | memset(skb_put(skb, pad), 0, pad); | |
649 | } | |
650 | ||
e8388eb1 DH |
651 | seq = atomic_inc_return(&call->sequence); |
652 | ||
17926a79 DH |
653 | sp->hdr.epoch = conn->epoch; |
654 | sp->hdr.cid = call->cid; | |
655 | sp->hdr.callNumber = call->call_id; | |
e8388eb1 | 656 | sp->hdr.seq = htonl(seq); |
17926a79 DH |
657 | sp->hdr.serial = |
658 | htonl(atomic_inc_return(&conn->serial)); | |
659 | sp->hdr.type = RXRPC_PACKET_TYPE_DATA; | |
660 | sp->hdr.userStatus = 0; | |
661 | sp->hdr.securityIndex = conn->security_ix; | |
662 | sp->hdr._rsvd = 0; | |
663 | sp->hdr.serviceId = conn->service_id; | |
664 | ||
665 | sp->hdr.flags = conn->out_clientflag; | |
01e97e65 | 666 | if (msg_data_left(msg) == 0 && !more) |
17926a79 DH |
667 | sp->hdr.flags |= RXRPC_LAST_PACKET; |
668 | else if (CIRC_SPACE(call->acks_head, call->acks_tail, | |
669 | call->acks_winsz) > 1) | |
670 | sp->hdr.flags |= RXRPC_MORE_PACKETS; | |
e8388eb1 DH |
671 | if (more && seq & 1) |
672 | sp->hdr.flags |= RXRPC_REQUEST_ACK; | |
17926a79 DH |
673 | |
674 | ret = rxrpc_secure_packet( | |
675 | call, skb, skb->mark, | |
676 | skb->head + sizeof(struct rxrpc_header)); | |
677 | if (ret < 0) | |
678 | goto out; | |
679 | ||
680 | memcpy(skb->head, &sp->hdr, | |
681 | sizeof(struct rxrpc_header)); | |
01e97e65 | 682 | rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more); |
17926a79 DH |
683 | skb = NULL; |
684 | } | |
01e97e65 | 685 | } while (msg_data_left(msg) > 0); |
17926a79 | 686 | |
19e6454c DH |
687 | success: |
688 | ret = copied; | |
17926a79 DH |
689 | out: |
690 | call->tx_pending = skb; | |
691 | _leave(" = %d", ret); | |
692 | return ret; | |
693 | ||
694 | call_aborted: | |
695 | rxrpc_free_skb(skb); | |
696 | if (call->state == RXRPC_CALL_NETWORK_ERROR) | |
697 | ret = call->conn->trans->peer->net_error; | |
698 | else | |
699 | ret = -ECONNABORTED; | |
700 | _leave(" = %d", ret); | |
701 | return ret; | |
702 | ||
703 | maybe_error: | |
704 | if (copied) | |
19e6454c | 705 | goto success; |
17926a79 DH |
706 | goto out; |
707 | ||
708 | efault: | |
709 | ret = -EFAULT; | |
710 | goto out; | |
711 | } |