1 /* AF_RXRPC sendmsg() implementation.
3 * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/net.h>
15 #include <linux/gfp.h>
16 #include <linux/skbuff.h>
17 #include <linux/export.h>
19 #include <net/af_rxrpc.h>
20 #include "ar-internal.h"
23 RXRPC_CMD_SEND_DATA
, /* send data message */
24 RXRPC_CMD_SEND_ABORT
, /* request abort generation */
25 RXRPC_CMD_ACCEPT
, /* [server] accept incoming call */
26 RXRPC_CMD_REJECT_BUSY
, /* [server] reject a call as busy */
30 * wait for space to appear in the transmit/ACK window
31 * - caller holds the socket locked
33 static int rxrpc_wait_for_tx_window(struct rxrpc_sock
*rx
,
34 struct rxrpc_call
*call
,
37 DECLARE_WAITQUEUE(myself
, current
);
41 call
->tx_hard_ack
, call
->tx_top
, call
->tx_winsize
);
43 add_wait_queue(&call
->waitq
, &myself
);
46 set_current_state(TASK_INTERRUPTIBLE
);
48 if (call
->tx_top
- call
->tx_hard_ack
<
49 min_t(unsigned int, call
->tx_winsize
,
50 call
->cong_cwnd
+ call
->cong_extra
))
52 if (call
->state
>= RXRPC_CALL_COMPLETE
) {
56 if (signal_pending(current
)) {
57 ret
= sock_intr_errno(*timeo
);
61 trace_rxrpc_transmit(call
, rxrpc_transmit_wait
);
62 release_sock(&rx
->sk
);
63 *timeo
= schedule_timeout(*timeo
);
67 remove_wait_queue(&call
->waitq
, &myself
);
68 set_current_state(TASK_RUNNING
);
74 * Schedule an instant Tx resend.
76 static inline void rxrpc_instant_resend(struct rxrpc_call
*call
, int ix
)
78 spin_lock_bh(&call
->lock
);
80 if (call
->state
< RXRPC_CALL_COMPLETE
) {
81 call
->rxtx_annotations
[ix
] = RXRPC_TX_ANNO_RETRANS
;
82 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND
, &call
->events
))
83 rxrpc_queue_call(call
);
86 spin_unlock_bh(&call
->lock
);
90 * Queue a DATA packet for transmission, set the resend timeout and send the
93 static void rxrpc_queue_packet(struct rxrpc_call
*call
, struct sk_buff
*skb
,
96 struct rxrpc_skb_priv
*sp
= rxrpc_skb(skb
);
97 rxrpc_seq_t seq
= sp
->hdr
.seq
;
99 u8 annotation
= RXRPC_TX_ANNO_UNACK
;
101 _net("queue skb %p [%d]", skb
, seq
);
103 ASSERTCMP(seq
, ==, call
->tx_top
+ 1);
106 annotation
|= RXRPC_TX_ANNO_LAST
;
108 /* We have to set the timestamp before queueing as the retransmit
109 * algorithm can see the packet as soon as we queue it.
111 skb
->tstamp
= ktime_get_real();
113 ix
= seq
& RXRPC_RXTX_BUFF_MASK
;
114 rxrpc_get_skb(skb
, rxrpc_skb_tx_got
);
115 call
->rxtx_annotations
[ix
] = annotation
;
117 call
->rxtx_buffer
[ix
] = skb
;
120 trace_rxrpc_transmit(call
, rxrpc_transmit_queue_last
);
122 trace_rxrpc_transmit(call
, rxrpc_transmit_queue
);
124 if (last
|| call
->state
== RXRPC_CALL_SERVER_ACK_REQUEST
) {
125 _debug("________awaiting reply/ACK__________");
126 write_lock_bh(&call
->state_lock
);
127 switch (call
->state
) {
128 case RXRPC_CALL_CLIENT_SEND_REQUEST
:
129 call
->state
= RXRPC_CALL_CLIENT_AWAIT_REPLY
;
131 case RXRPC_CALL_SERVER_ACK_REQUEST
:
132 call
->state
= RXRPC_CALL_SERVER_SEND_REPLY
;
135 case RXRPC_CALL_SERVER_SEND_REPLY
:
136 call
->state
= RXRPC_CALL_SERVER_AWAIT_ACK
;
141 write_unlock_bh(&call
->state_lock
);
144 if (seq
== 1 && rxrpc_is_client_call(call
))
145 rxrpc_expose_client_call(call
);
147 ret
= rxrpc_send_data_packet(call
, skb
, false);
149 _debug("need instant resend %d", ret
);
150 rxrpc_instant_resend(call
, ix
);
152 ktime_t now
= ktime_get_real(), resend_at
;
154 resend_at
= ktime_add_ms(now
, rxrpc_resend_timeout
);
156 if (ktime_before(resend_at
, call
->resend_at
)) {
157 call
->resend_at
= resend_at
;
158 rxrpc_set_timer(call
, rxrpc_timer_set_for_send
, now
);
162 rxrpc_free_skb(skb
, rxrpc_skb_tx_freed
);
167 * send data through a socket
168 * - must be called in process context
169 * - caller holds the socket locked
171 static int rxrpc_send_data(struct rxrpc_sock
*rx
,
172 struct rxrpc_call
*call
,
173 struct msghdr
*msg
, size_t len
)
175 struct rxrpc_skb_priv
*sp
;
177 struct sock
*sk
= &rx
->sk
;
182 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
184 /* this should be in poll */
185 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
187 if (sk
->sk_err
|| (sk
->sk_shutdown
& SEND_SHUTDOWN
))
190 more
= msg
->msg_flags
& MSG_MORE
;
192 skb
= call
->tx_pending
;
193 call
->tx_pending
= NULL
;
194 rxrpc_see_skb(skb
, rxrpc_skb_tx_seen
);
198 /* Check to see if there's a ping ACK to reply to. */
199 if (call
->ackr_reason
== RXRPC_ACK_PING_RESPONSE
)
200 rxrpc_send_call_packet(call
, RXRPC_PACKET_TYPE_ACK
);
203 size_t size
, chunk
, max
, space
;
207 if (call
->tx_top
- call
->tx_hard_ack
>=
208 min_t(unsigned int, call
->tx_winsize
,
209 call
->cong_cwnd
+ call
->cong_extra
)) {
211 if (msg
->msg_flags
& MSG_DONTWAIT
)
213 ret
= rxrpc_wait_for_tx_window(rx
, call
,
219 max
= RXRPC_JUMBO_DATALEN
;
220 max
-= call
->conn
->security_size
;
221 max
&= ~(call
->conn
->size_align
- 1UL);
224 if (chunk
> msg_data_left(msg
) && !more
)
225 chunk
= msg_data_left(msg
);
227 space
= chunk
+ call
->conn
->size_align
;
228 space
&= ~(call
->conn
->size_align
- 1UL);
230 size
= space
+ call
->conn
->security_size
;
232 _debug("SIZE: %zu/%zu/%zu", chunk
, space
, size
);
234 /* create a buffer that we can retain until it's ACK'd */
235 skb
= sock_alloc_send_skb(
236 sk
, size
, msg
->msg_flags
& MSG_DONTWAIT
, &ret
);
240 rxrpc_new_skb(skb
, rxrpc_skb_tx_new
);
242 _debug("ALLOC SEND %p", skb
);
244 ASSERTCMP(skb
->mark
, ==, 0);
246 _debug("HS: %u", call
->conn
->security_size
);
247 skb_reserve(skb
, call
->conn
->security_size
);
248 skb
->len
+= call
->conn
->security_size
;
252 if (sp
->remain
> skb_tailroom(skb
))
253 sp
->remain
= skb_tailroom(skb
);
255 _net("skb: hr %d, tr %d, hl %d, rm %d",
261 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
267 /* append next segment of data to the current buffer */
268 if (msg_data_left(msg
) > 0) {
269 int copy
= skb_tailroom(skb
);
270 ASSERTCMP(copy
, >, 0);
271 if (copy
> msg_data_left(msg
))
272 copy
= msg_data_left(msg
);
273 if (copy
> sp
->remain
)
277 ret
= skb_add_data(skb
, &msg
->msg_iter
, copy
);
286 /* check for the far side aborting the call or a network error
288 if (call
->state
== RXRPC_CALL_COMPLETE
)
289 goto call_terminated
;
291 /* add the packet to the send queue if it's now full */
292 if (sp
->remain
<= 0 ||
293 (msg_data_left(msg
) == 0 && !more
)) {
294 struct rxrpc_connection
*conn
= call
->conn
;
298 /* pad out if we're using security */
299 if (conn
->security_ix
) {
300 pad
= conn
->security_size
+ skb
->mark
;
301 pad
= conn
->size_align
- pad
;
302 pad
&= conn
->size_align
- 1;
303 _debug("pad %zu", pad
);
305 memset(skb_put(skb
, pad
), 0, pad
);
308 seq
= call
->tx_top
+ 1;
312 sp
->hdr
.flags
= conn
->out_clientflag
;
314 if (msg_data_left(msg
) == 0 && !more
)
315 sp
->hdr
.flags
|= RXRPC_LAST_PACKET
;
316 else if (call
->tx_top
- call
->tx_hard_ack
<
318 sp
->hdr
.flags
|= RXRPC_MORE_PACKETS
;
320 ret
= conn
->security
->secure_packet(
321 call
, skb
, skb
->mark
, skb
->head
);
325 rxrpc_queue_packet(call
, skb
, !msg_data_left(msg
) && !more
);
328 } while (msg_data_left(msg
) > 0);
333 call
->tx_pending
= skb
;
334 _leave(" = %d", ret
);
338 rxrpc_free_skb(skb
, rxrpc_skb_tx_freed
);
339 _leave(" = %d", -call
->error
);
353 * extract control messages from the sendmsg() control buffer
355 static int rxrpc_sendmsg_cmsg(struct msghdr
*msg
,
356 unsigned long *user_call_ID
,
357 enum rxrpc_command
*command
,
361 struct cmsghdr
*cmsg
;
362 bool got_user_ID
= false;
365 *command
= RXRPC_CMD_SEND_DATA
;
367 if (msg
->msg_controllen
== 0)
370 for_each_cmsghdr(cmsg
, msg
) {
371 if (!CMSG_OK(msg
, cmsg
))
374 len
= cmsg
->cmsg_len
- CMSG_ALIGN(sizeof(struct cmsghdr
));
375 _debug("CMSG %d, %d, %d",
376 cmsg
->cmsg_level
, cmsg
->cmsg_type
, len
);
378 if (cmsg
->cmsg_level
!= SOL_RXRPC
)
381 switch (cmsg
->cmsg_type
) {
382 case RXRPC_USER_CALL_ID
:
383 if (msg
->msg_flags
& MSG_CMSG_COMPAT
) {
384 if (len
!= sizeof(u32
))
386 *user_call_ID
= *(u32
*) CMSG_DATA(cmsg
);
388 if (len
!= sizeof(unsigned long))
390 *user_call_ID
= *(unsigned long *)
393 _debug("User Call ID %lx", *user_call_ID
);
398 if (*command
!= RXRPC_CMD_SEND_DATA
)
400 *command
= RXRPC_CMD_SEND_ABORT
;
401 if (len
!= sizeof(*abort_code
))
403 *abort_code
= *(unsigned int *) CMSG_DATA(cmsg
);
404 _debug("Abort %x", *abort_code
);
405 if (*abort_code
== 0)
410 if (*command
!= RXRPC_CMD_SEND_DATA
)
412 *command
= RXRPC_CMD_ACCEPT
;
417 case RXRPC_EXCLUSIVE_CALL
:
434 * Create a new client call for sendmsg().
436 static struct rxrpc_call
*
437 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock
*rx
, struct msghdr
*msg
,
438 unsigned long user_call_ID
, bool exclusive
)
440 struct rxrpc_conn_parameters cp
;
441 struct rxrpc_call
*call
;
444 DECLARE_SOCKADDR(struct sockaddr_rxrpc
*, srx
, msg
->msg_name
);
449 return ERR_PTR(-EDESTADDRREQ
);
452 if (key
&& !rx
->key
->payload
.data
[0])
455 memset(&cp
, 0, sizeof(cp
));
456 cp
.local
= rx
->local
;
458 cp
.security_level
= rx
->min_sec_level
;
459 cp
.exclusive
= rx
->exclusive
| exclusive
;
460 cp
.service_id
= srx
->srx_service
;
461 call
= rxrpc_new_client_call(rx
, &cp
, srx
, user_call_ID
, GFP_KERNEL
);
463 _leave(" = %p\n", call
);
468 * send a message forming part of a client call through an RxRPC socket
469 * - caller holds the socket locked
470 * - the socket may be either a client socket or a server socket
472 int rxrpc_do_sendmsg(struct rxrpc_sock
*rx
, struct msghdr
*msg
, size_t len
)
474 enum rxrpc_command cmd
;
475 struct rxrpc_call
*call
;
476 unsigned long user_call_ID
= 0;
477 bool exclusive
= false;
483 ret
= rxrpc_sendmsg_cmsg(msg
, &user_call_ID
, &cmd
, &abort_code
,
488 if (cmd
== RXRPC_CMD_ACCEPT
) {
489 if (rx
->sk
.sk_state
!= RXRPC_SERVER_LISTENING
)
491 call
= rxrpc_accept_call(rx
, user_call_ID
, NULL
);
493 return PTR_ERR(call
);
494 rxrpc_put_call(call
, rxrpc_call_put
);
498 call
= rxrpc_find_call_by_user_ID(rx
, user_call_ID
);
500 if (cmd
!= RXRPC_CMD_SEND_DATA
)
502 call
= rxrpc_new_client_call_for_sendmsg(rx
, msg
, user_call_ID
,
505 return PTR_ERR(call
);
508 _debug("CALL %d USR %lx ST %d on CONN %p",
509 call
->debug_id
, call
->user_call_ID
, call
->state
, call
->conn
);
511 if (call
->state
>= RXRPC_CALL_COMPLETE
) {
512 /* it's too late for this call */
514 } else if (cmd
== RXRPC_CMD_SEND_ABORT
) {
516 if (rxrpc_abort_call("CMD", call
, 0, abort_code
, ECONNABORTED
))
517 ret
= rxrpc_send_call_packet(call
,
518 RXRPC_PACKET_TYPE_ABORT
);
519 } else if (cmd
!= RXRPC_CMD_SEND_DATA
) {
521 } else if (rxrpc_is_client_call(call
) &&
522 call
->state
!= RXRPC_CALL_CLIENT_SEND_REQUEST
) {
523 /* request phase complete for this client call */
525 } else if (rxrpc_is_service_call(call
) &&
526 call
->state
!= RXRPC_CALL_SERVER_ACK_REQUEST
&&
527 call
->state
!= RXRPC_CALL_SERVER_SEND_REPLY
) {
528 /* Reply phase not begun or not complete for service call. */
531 ret
= rxrpc_send_data(rx
, call
, msg
, len
);
534 rxrpc_put_call(call
, rxrpc_call_put
);
535 _leave(" = %d", ret
);
540 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
541 * @sock: The socket the call is on
542 * @call: The call to send data through
543 * @msg: The data to send
544 * @len: The amount of data to send
546 * Allow a kernel service to send data on a call. The call must be in an state
547 * appropriate to sending data. No control data should be supplied in @msg,
548 * nor should an address be supplied. MSG_MORE should be flagged if there's
549 * more data to come, otherwise this data will end the transmission phase.
551 int rxrpc_kernel_send_data(struct socket
*sock
, struct rxrpc_call
*call
,
552 struct msghdr
*msg
, size_t len
)
556 _enter("{%d,%s},", call
->debug_id
, rxrpc_call_states
[call
->state
]);
558 ASSERTCMP(msg
->msg_name
, ==, NULL
);
559 ASSERTCMP(msg
->msg_control
, ==, NULL
);
563 _debug("CALL %d USR %lx ST %d on CONN %p",
564 call
->debug_id
, call
->user_call_ID
, call
->state
, call
->conn
);
566 if (call
->state
>= RXRPC_CALL_COMPLETE
) {
567 ret
= -ESHUTDOWN
; /* it's too late for this call */
568 } else if (call
->state
!= RXRPC_CALL_CLIENT_SEND_REQUEST
&&
569 call
->state
!= RXRPC_CALL_SERVER_ACK_REQUEST
&&
570 call
->state
!= RXRPC_CALL_SERVER_SEND_REPLY
) {
571 ret
= -EPROTO
; /* request phase complete for this client call */
573 ret
= rxrpc_send_data(rxrpc_sk(sock
->sk
), call
, msg
, len
);
576 release_sock(sock
->sk
);
577 _leave(" = %d", ret
);
580 EXPORT_SYMBOL(rxrpc_kernel_send_data
);
583 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
584 * @sock: The socket the call is on
585 * @call: The call to be aborted
586 * @abort_code: The abort code to stick into the ABORT packet
587 * @error: Local error value
588 * @why: 3-char string indicating why.
590 * Allow a kernel service to abort a call, if it's still in an abortable state.
592 void rxrpc_kernel_abort_call(struct socket
*sock
, struct rxrpc_call
*call
,
593 u32 abort_code
, int error
, const char *why
)
595 _enter("{%d},%d,%d,%s", call
->debug_id
, abort_code
, error
, why
);
599 if (rxrpc_abort_call(why
, call
, 0, abort_code
, error
))
600 rxrpc_send_call_packet(call
, RXRPC_PACKET_TYPE_ABORT
);
602 release_sock(sock
->sk
);
606 EXPORT_SYMBOL(rxrpc_kernel_abort_call
);